U.S. patent number RE37,422 [Application Number 08/724,968] was granted by the patent office on 2001-10-30 for electronic musical instrument.
This patent grant is currently assigned to Yamaha Corporation. Invention is credited to Masahiro Shimizu, Hideo Yamada.
United States Patent |
RE37,422 |
Yamada , et al. |
October 30, 2001 |
Electronic musical instrument
Abstract
An electronic musical instrument, which is configured to
simulate one or more instruments, provides a sound source, a
display unit and a control portion. Herein, under control of the
control portion, the display unit displays the predetermined
graphic pattern corresponding to the tone-generation mechanism,
i.e., tone-generation algorithm of an instrument to be simulated.
The sound source contains a drive portion, a tone-generation
portion and a resonance-radiation portion, each of which further
contains a digital signal processor (DSP). All of these portions
function to create a digitized musical tone signal corresponding to
a simulated sound of the instrument by combining operation data
outputted from the DSPs. By controlling the display unit, it is
possible to arbitrarily vary the contents of the displayed
tone-generation algorithm, so that the performer can easily and
freely perform a music on this electronic musical instrument.
Inventors: |
Yamada; Hideo (Hamamatsu,
JP), Shimizu; Masahiro (Hamamatsu, JP) |
Assignee: |
Yamaha Corporation
(JP)
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Family
ID: |
27339427 |
Appl.
No.: |
08/724,968 |
Filed: |
October 3, 1996 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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220901 |
Mar 31, 1994 |
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Reissue of: |
793996 |
Nov 18, 1991 |
05220117 |
Jun 15, 1993 |
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Foreign Application Priority Data
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Nov 20, 1990 [JP] |
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2-314690 |
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Current U.S.
Class: |
84/600; 84/607;
84/615; 84/622; 84/661; 84/DIG.9 |
Current CPC
Class: |
F16H
57/04 (20130101); G10H 5/007 (20130101); G10H
7/004 (20130101); G10H 2250/441 (20130101); G10H
2250/461 (20130101); G10H 2250/535 (20130101) |
Current International
Class: |
G10H
5/00 (20060101); G10H 7/00 (20060101); G10H
001/12 (); G10H 007/00 () |
Field of
Search: |
;84/600-602,607,615,622-625,653,658-661,DIG.9,DIG.10 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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0 393 701 A |
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Apr 1990 |
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EP |
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0 397 149 A |
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May 1990 |
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EP |
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63-40199 |
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Feb 1988 |
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JP |
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2-45596 |
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Mar 1990 |
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JP |
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WO 84/02416 |
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Jun 1984 |
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WO |
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WO 86/02791 |
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May 1986 |
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WO |
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Other References
"Fernseh-Und Kinotechnik," vol. 43, No. 3, 1989, Heidelberg, pp.
156-157, H. Zander "Der Personalcomputer als Universales
Hilfsmittel in Labor und Studio (VII)". .
"Keyboards Homerecording & Computer," Nov. 1989, pp. 48-49,
"Yamaha SY77 Synthesizer Der DX7 der 90er Jahre". .
"Der Personalcomputer als universales Hilfsmittel in Labor und
Studio (VII)" Horst Zander, Fernseh Und Kino-Technik 43. .
Jahrgang No. 3/1989, P 156-157 (and translation)..
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Primary Examiner: Witkowski; Stanley J.
Attorney, Agent or Firm: Morrison & Foerster
Parent Case Text
.Iadd.This reissue application is a continuation of application
Ser. No. 08/220,901, filed on Mar. 31, 1994, now abandoned, which
is a reissue application of U.S. Pat. No. 5,220,117 granted Jun.
15, 1993..Iaddend.
Claims
What is claimed is:
1. An electronic musical instrument comprising
a drive means for generating an excitation signal corresponding to
tone-generation energy;
a tone-generation means for resonating said excitation signal to
thereby output a resonated signal;
a plurality of drive algorithms and a plurality of tone generation
algorithms representing different operation manners of the drive
means and tone-generation means, respectively;
display means for displaying a graphic pattern representative of a
selected drive algorithm and a selected tone-generation algorithm;
and
algorithm control means for varying the operation manners of said
drive means and said tone-generation means to operate in accordance
with the displayed pattern as selected by a performer.
2. An electronic musical instrument for simulating plural
instruments comprising:
sound source means for outputting a musical tone signal in
accordance with a tone-generation algorithm which is pre-defined
for each of instruments to be simulated;
display means for displaying a representation of said tone
generation algorithm in form of a predetermined graphic pattern
comprised of plural portions of musical instruments which may be
selected by a performer; and
algorithm control means for controlling said display means in
accordance with an operation made by a performer to display
selected portions of musical instruments and for varying the
contents of the tone-generation algorithm to correspond to the
display.
3. An electronic musical instrument as defined in claim 2 wherein
said sound source means contains a drive portion, a tone-generation
portion and a resonance-radiation portion all of which function to
create said musical tone signal corresponding to an instrument to
be simulated.
4. An electronic musical instrument as defined in claim 3 wherein
each portion of said sound source means contains a digital signal
processor (DSP) which outputs operation data corresponding to
sampling data of sounds of an instrument to be simulated..Iadd.
5. An electronic musical instrument comprising:
a tone generation system for generating tones based upon a tone
generation algorithm for modeling selected physical tone generation
operations including an excitation portion which produces an
excitation signal and a tone formation portion which receives the
excitation signal and subjects it to oscillation to produce an
oscillation signal;
program storage memory for storing at least one first program for
said excitation portion and a set of second programs for said tone
formation portion, wherein each of the first and second programs
are different from one another; and
program selection means for selecting one of the second programs
for use as said tone formation portion, wherein the tone generation
system produces a tone signal based on the excitation signal and
the oscillation signal..Iaddend..Iadd.
6. An electronic musical instrument as in claim 5 wherein plural
first programs are stored and wherein the program selection means
includes means for selecting one of the first programs and one of
the second programs to constitute the tone generation
algorithm..Iaddend..Iadd.
7. An electronic musical instrument as in claim 6 wherein the tone
formation portion includes a vibration source portion and a
resonance radiation portion and the set of second programs includes
a first subset of vibration source programs and a second subset of
resonance radiation programs different from the vibration source
programs, and wherein the program selection means selects one
program from each subset to form the second
program..Iaddend..Iadd.
8. An electronic musical instrument, comprising:
a tone generation system for modeling selected physical tone
generation operations, including first operation means for
generating an excitation signal by executing a drive algorithm, and
second operation means for receiving the excitation signal and for
generating an oscillation signal by executing an oscillation
algorithm which causes oscillation of the excitation signal,
wherein the tone generation system generates a musical tone signal
based on the excitation signal and the oscillation signal; and
algorithm selecting means for selecting at least one of the drive
algorithm and the oscillation algorithm from among plural different
drive algorithms or oscillation algorithms,
respectively..Iaddend..Iadd.
9. An electronic musical instrument as in claim 8 wherein the
algorithm selecting means selects a drive algorithm from among
plural drive algorithms including at least two of a string striking
algorithm, a string bowing algorithm, a string plucking algorithm,
a reed algorithm and a non-reed breath
algorithm..Iaddend..Iadd.
10. An electronic musical instrument as in claim 8 wherein the
oscillating signal is circulated back to the first operating means
for operation with the excitation signal, wherein the instrument
further comprises mixing means for mixing signals generated by the
first and second operation means and outputting the mixed signal as
a musical tone signal..Iaddend..Iadd.
11. An electronic musical instrument as in claim 8 including
parameter variation accommodation means, responsive to the change
of a parameter value of either the first or second operation means,
for adjusting the value of at least an additional parameter which
controls at least one of gain balance between the first and second
operation means and a fundamental pitch of a tone to be generated,
thereby to stabilize operation of the electronic musical instrument
in response to parameter changes..Iaddend..Iadd.
12. An electronic musical instrument as in claim 8 further
comprising filter means between the first operation means and the
second operation means for filtering the excitation signal to avoid
anomalous oscillation..Iaddend..Iadd.
13. An electronic musical instrument comprising:
a tone generation system for modeling selected physical tone
generation operations, including first operation means for
generating an oscillation signal by executing an oscillation
algorithm, and second operation means for receiving the oscillation
signal and for generating an output signal by executing a resonance
radiation algorithm, wherein the tone generation system generates a
musical tone signal in accordance with a tone generation algorithm
including the oscillation algorithm and the resonance radiation
algorithm; and
algorithm selecting means for selecting at least one of the
oscillation algorithm and resonance radiation algorithm from among
plural different oscillation algorithms or resonance radiation
algorithms, respectively..Iaddend..Iadd.
14. An electronic musical instrument as in claim 13 wherein the
algorithm selecting means selects an oscillation algorithm from
among at least two of an algorithm corresponding to a string, at
least one algorithm corresponding to a tube having at least one
tone hole, an algorithm corresponding to a branched tube and an
algorithm corresponding to a tube having no tone
holes..Iaddend..Iadd.
15. An electronic musical instrument as in claim 13 wherein the
algorithm selecting means selects a resonance radiation algorithm
from among at least two of an algorithm corresponding to a piano
body, an algorithm corresponding to a resonant box, an algorithm
corresponding to a tapered tube, at least one algorithm
corresponding to an exponential curve tube and an algorithm
corresponding to a metal board..Iaddend..Iadd.
16. An electronic musical instrument as in claim 13 including
parameter variation accommodation means, responsive to the change
of a parameter value of either the first or second operation means,
for adjusting the value of at least an additional parameter which
controls at least one of gain balance between the first and second
operation means and a fundamental pitch of a tone to be generated,
thereby to stabilize operation of the electronic musical instrument
in response to parameter changes..Iaddend..Iadd.
17. An electronic musical instrument comprising:
a tone generation system for modeling selected physical tone
generation operations, including a first digital signal processor
for executing a first algorithm, and a second digital signal
processor for executing a second algorithm, wherein the tone
generation system generates a musical tone signal in accordance
with a tone generation algorithm based on cooperative execution of
the respective first and second algorithms by the first and second
digital signal processors;
a memory for storing a plurality of different first algorithms and
a plurality of different second algorithms;
algorithm selecting means for selecting one of the first programs
and one of the second programs; and
control means for setting the selected first program for use by the
first digital signal processor and the selected second program for
use by the second digital signal processor, whereby a tone signal
is generated in accordance with the selected first and second
programs..Iaddend..Iadd.
18. An electronic musical instrument comprising:
a tone generation system for generating tones based upon a tone
generation algorithm for modeling the physical tone generation
characteristics of a selected non-electronic musical instrument,
the tone generation system including an excitation portion which
produces an excitation signal and a tone formation portion which
receives the excitation signal and circulates it within a loop
including a delay to generate an oscillation signal;
a selector which is operable to select a combination of excitation
portion and tone formation portion from among at least one
available excitation portion and at least two different available
tone formation portions..Iaddend..Iadd.
19. A method of generating a musical tone, comprising the steps
of:
generating tones based upon a tone generation algorithm for
modeling selected physical tone generation operations including an
excitation portion which produces an excitation signal and a tone
formation portion which receives the excitation signal and subjects
it to oscillation to produce an oscillation signal;
storing at least one first program for said excitation portion and
a set of second programs for said tone formation portion, wherein
each of the first and second programs are different from one
another; and
selecting one of the second programs for use as said tone formation
portion, wherein the step of generating tones produces a tone
signal based on the excitation signal and the oscillation
signal..Iaddend..Iadd.
20. The method of claim 19, wherein the storing step further
comprises the step of storing plural first programs and wherein the
selecting step further comprises the step of selecting one of the
first programs and one of the second programs to constitute the
tone generation algorithm..Iaddend..Iadd.
21. The method of claim 20 wherein the tone formation portion
includes a vibration source portion and a resonance radiation
portion and wherein the storing step further comprises the step of
storing for the set of second programs a first subset of vibration
source programs and a second subset of resonance radiation programs
different from the vibration source programs, and wherein the
selecting step further comprises the step of selecting one program
from each subset to form the second program..Iaddend..Iadd.
22. A method of generating a musical tone, comprising the steps
of:
modeling selected physical tone generation operations, including a
first step of generating an excitation signal by executing a drive
algorithm, a second step of receiving the excitation signal, and a
third step of generating an oscillation signal by executing an
oscillation algorithm which causes oscillation of the excitation
signal, wherein the modeling step allows the generation of a
musical tone signal based on the excitation signal and the
oscillation signal; and
selecting at least one of the drive algorithm and the oscillation
algorithm from among plural different drive algorithms or
oscillation algorithms, respectively..Iaddend..Iadd.
23. The method of claim 22 wherein the selecting step further
comprises the step of selecting a drive algorithm from among plural
drive algorithms including at least two of a string striking
algorithm, a string bowing algorithm, a string plucking algorithm,
a reed algorithm, and a non-reed breath
algorithm..Iaddend..Iadd.
24. The method of claim 22 wherein the modeling step further
comprises the step of circulating back the oscillating signal to
the first generating step for operation with the excitation signal,
and wherein the method further comprises the step of:
mixing signals generated by the first and third generating steps
and outputting the mixed signal as a musical tone
signal..Iaddend..Iadd.
25. The method of claim 22, further comprising the step of
responding to the change of a parameter value of either the first
or third generating steps to adjust the value of at least an
additional parameter which controls at least one of gain balance
between the first and third generating steps and a fundamental
pitch of a tone to be generated, thereby to stabilize operation of
generating a musical tone in response to parameter
changes..Iaddend..Iadd.
26. The method of claim 22, wherein the modeling step further
comprises the step of filtering the excitation signal, between the
first and third generating steps, to avoid anomalous
oscillation..Iaddend..Iadd.
27. A method of generating a musical tone, comprising the steps
of:
modeling selected physical tone generation operations, including a
first step of generating an oscillation signal by executing an
oscillation algorithm, a second step of receiving the oscillation
signal, and a third step of generating an output signal by
executing a resonance radiation algorithm, wherein the modeling
step allows the generation of a musical tone signal in accordance
with a tone generation algorithm including the oscillation
algorithm and the resonance radiation algorithm; and
selecting at least one of the oscillation algorithm and resonance
radiation algorithm from among plural different oscillation
algorithms or resonance radiation algorithms,
respectively..Iaddend..Iadd.
28. The method of claim 27 wherein the selecting step further
comprises the step of selecting an oscillation algorithm from among
at least two of an algorithm corresponding to a string, at least
one algorithm corresponding to a tube having at least one tone
hole, an algorithm corresponding to a branched tube, and an
algorithm corresponding to a tube having no tone
holes..Iaddend..Iadd.
29. The method of claim 27 wherein the selecting step further
comprises the step of selecting a resonance radiation algorithm
from among at least two of an algorithm corresponding to a piano
body, an algorithm corresponding to a resonant box, an algorithm
corresponding to a tapered tube, at least one algorithm
corresponding to an exponential curve tube, and an algorithm
corresponding to a metal board..Iaddend..Iadd.
30. The method of claim 27 further comprising the step of
responding to the change of a parameter value of either the first
or third generating steps to adjust the value of at least an
additional parameter which controls at least one of gain balance
between the first and third generating steps and a fundamental
pitch of a tone to be generated, thereby to stabilize operation of
generating a musical tone in response to parameter
changes..Iaddend..Iadd.
31. A method of generating a musical tone, comprising the steps
of:
modeling selected physical tone generation operations, including a
first digital signal processor for executing a first algorithm, and
a second digital signal processor for executing a second algorithm,
wherein the modeling step allows the generation of a musical tone
signal in accordance with a tone generation algorithm based on
cooperative execution of the respective first and second algorithms
by the first and second digital signal processors;
storing a plurality of different first algorithms and a plurality
of different second algorithms;
selecting one of the first programs and one of the second programs;
and
setting the selected first program for use by the first digital
signal processor and the selected second program for use by the
second digital signal processor, whereby a tone signal is generated
in accordance with the selected first and second
programs..Iaddend..Iadd.
32. A method of generating a musical tone, comprising the steps
of:
generating tones based upon a tone generation algorithm for
modeling the physical tone generation operations, the step of
generating tones including an excitation step which produces an
excitation signal and a tone formation step which receives the
excitation signal and circulates it within a loop including a delay
to generate an oscillation signal; and
selecting a combination of excitation signal and oscillation signal
from among at least one available excitation signal and at least
two different available oscillation signals..Iaddend..Iadd.
33. A processor-readable memory containing a group of program
instructions executable by a processor for generating a tone, the
memory including the program steps of:
generating tones based upon a tone generation algorithm for
modeling selected physical tone generation operations including an
excitation portion which produces an excitation signal and a tone
formation portion which receives the excitation signal and subjects
it to oscillation to produce an oscillation signal;
storing at least one first program for said excitation portion and
a set of second programs for said tone formation portion, wherein
each of the first and second programs are different from one
another; and
selecting one of the second programs for use as said tone formation
portion, wherein the step of generating tones produces a tone
signal based on the excitation signal and the oscillation
signal..Iaddend..Iadd.
34. The memory of claim 33, wherein the storing step further
comprises the step of storing plural first programs and wherein the
selecting step further comprises the step of selecting one of the
first programs and one of the second programs to constitute the
tone generation algorithm..Iaddend..Iadd.
35. The memory of claim 34 wherein the tone formation portion
includes a vibration source portion and a resonance radiation
portion and wherein the storing step further comprises the step of
storing for the set of second programs a first subset of vibration
source programs and a second subset of resonance radiation programs
different from the vibration source programs, and wherein the
selecting step further comprises the step of selecting one program
from each subset to form the second program..Iaddend..Iadd.
36. A processor-readable memory containing a group of program
instructions executable by a processor for generating a tone, the
memory including the program steps of:
modeling selected physical tone generation operations, including a
first step of generating an excitation signal by executing a drive
algorithm, a second step of receiving the excitation signal, and a
third step of generating an oscillation signal by executing an
oscillation algorithm which causes oscillation of the excitation
signal, wherein the modeling step allows the generation of a
musical tone signal based on the excitation signal and the
oscillation signals; and
selecting at least one of the drive algorithm and the oscillation
algorithm from among plural different drive algorithms or
oscillation, respectively..Iaddend..Iadd.
37. The memory of claim 36, wherein the selecting step further
comprises the step of selecting a drive algorithm from among plural
drive algorithms including at least two of a string stroking
algorithm, a string bowing algorithm, a string plucking algorithm,
a reed algorithm, and a non-reed breath
algorithm..Iaddend..Iadd.
38. The memory of claim 36 wherein the modeling step further
comprises the step of circulating back the oscillating signal to
the first generating step for operation with the excitation signal,
and wherein the program further comprises the step of:
mixing signals generated by the first and third generating steps
and outputting the mixed signal as a musical tone
signal..Iaddend..Iadd.
39. The memory of claim 36, further comprising the step of
responding to the change of a parameter value of either the first
or third generating steps to adjust the value of at least an
additional parameter which controls at least one of gain balance
between the first and third generating steps and a fundamental
pitch of a tone to be generated, thereby to stabilize operation of
generating a musical tone in response to parameter
changes..Iaddend..Iadd.
40. The memory of claim 36, wherein the modeling step further
comprises the step of filtering the excitation signal, between the
first and third generating steps, to avoid anomalous
oscillation..Iaddend..Iadd.
41. A processor-readable memory containing a group of program
instructions executable by a processor for generating a tone, the
memory including the program steps of:
modeling selected physical tone generation operations, including a
first step of generating an oscillation signal by executing an
oscillation algorithm, a second step receiving the oscillation
signal, and a third step of generating an output signal by
executing a resonance radiation algorithm, wherein the modeling
step allows the generation of a musical tone signal in accordance
with a tone generation algorithm including the oscillation
algorithm and the resonance radiation algorithms; and
selecting at least one of the oscillation algorithm and resonance
radiation algorithm from among plural different oscillation
algorithms or resonance radiation algorithms,
respectively..Iaddend..Iadd.
42. The memory of claim 41 wherein the selecting step further
comprises the step of selecting an oscillation algorithm from among
at least two of an algorithm corresponding to a string, at least
one algorithm corresponding to a tube having at least one tone
hole, an algorithm corresponding to a branched tube, and an
algorithm corresponding to a tube having no tone
holes..Iaddend..Iadd.
43. The memory of claim 41 wherein the selecting step further
comprises the step of selecting a resonance radiation algorithm
from among at least two of an algorithm corresponding to a piano
body, an algorithm corresponding to a resonant box, an algorithm
corresponding to a tapered tube, at least one algorithm
corresponding to an exponential curve tube, and an algorithm
corresponding to a metal board..Iaddend..Iadd.
44. The memory of claim 41 further comprising the step of
responding to the change of a parameter value of either the first
or third generating steps to adjust the value of at least an
additional parameter which controls at least one of gain balance
between the first and third generating steps and a fundamental
patch of a tone to be generated, thereby to stabilize operation of
generating a musical tone in response to parameter
changes..Iaddend..Iadd.
45. A processor-readable memory containing a group of program
instructions executable by a processor for generating a tone, the
memory including the program steps of:
modeling selected physical tone generation operations, including a
first digital signal processor for executing a first algorithm, and
a second digital signal processor for executing a second algorithm,
wherein the modeling step allows the generation of a ii tone signal
in accordance with a tone generate algorithm based on cooperative
execution of the respective first and second algorithms by the
first and second digital signal processors;
storing a plurality of different first algorithms and a plurality
of different second algorithms;
selecting one of the first programs and one of the second programs;
and
setting the selected first program for use by the first digital
signal processor and the selected second program for use by the
second digital signal processor, whereby a tone signal is generated
in accordance with the selected first and second
programs..Iaddend..Iadd.
46. A processor-readable memory containing a group of program
instructions executable by a processor for generating a tone, the
including the program steps of:
generating tones based upon a tone generation algorithm for
modeling the physical tone generation operations, the step of
generating tones including an excitation step which produces an
excitation signal and a tone formation step which receives the
excitation signal and circulates it within a loop including a delay
to generate an oscillation signal;
selecting a combination of excitation signal and oscillation signal
from among at least one available excitation signal and at least
two different available oscillation signals..Iaddend.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electronic musical instrument
which is suitable for synthesizing a desirable musical tone by
combining plural sounds.
2. Prior Art
Recently, there are developed several kinds of electronic musical
instruments each of which activates a simulation model of a
tone-generation mechanism of a non-electronic musical instrument so
as to synthesize its musical tone. Such music synthesis technique
is disclosed in the papers such as U.S. Pat. Nos. 4,984,276 and
4,130,043. Herein, there is disclosed an electronic musical
instrument which simulates a tone-generation mechanism of the wind
instrument such as the clarinet. In addition, the above-mentioned
papers also disclose about the electronic musical instruments which
simulate tone-generation mechanisms of the string-plucking-type
instrument such as the guitar and string-striking-type instrument
such as the piano.
Meanwhile, currently produced electronic musical instrument may
provide plural FM sound sources called "operators". By arbitrarily
combining some of these operators, a desirable musical tone is to
be synthesized. In addition, the above-mentioned electronic musical
instrument provides a liquid crystal display (i.e., "LCD") which
displays the combining state or connecting manner of these
operators. This combining state of the operators is called
"algorithm" which is an important element for determining the tone
color of the musical tone to be generated. By use of this
algorithm, the user of this electronic musical instrument can
acknowledge the physical combination of the sound sources.
Therefore, by changing the contents of this algorithm, it is
possible to carry out the sound synthesis or sound composition with
ease.
When applying the above-mentioned function to the conventional
electronic musical instrument which simulates the tone-generation
mechanism of the non-electronic musical instrument, it is possible
to carry out the varied sound synthesis by arbitrarily combining
some of the tone-generation mechanisms of the non-electronic
musical instruments. However, when using the different musical
instrument to be simulated, such electronic musical instrument must
require completely different tone-generation algorithm or its
operation parameters. For this reason, when carrying out the sound
synthesis by freely using several kinds of the tone-generation
mechanisms, it is required for the user to have the expert
knowledge concerning the tone-generation mechanism of the
instrument itself to be simulated. This is difficult for the
non-professional user who does not have the expert knowledge about
the musical instrument, because such user cannot figure out the
setting manner of the algorithm or operation parameters. Thus,
there is a problem in that the sound synthesis is very difficult
for the users.
SUMMARY OF THE INVENTION
It is accordingly a primary object of the present invention to
provide an electronic musical instrument which can carry out the
sound synthesis by freely using several kinds of the
tone-generation mechanisms of the non-electronic musical
instruments with ease.
In a first aspect of the present invention, there is provided an
electronic musical instrument comprising:
drive means for generating an excitation signal corresponding to
tone-generation energy;
tone-generation means for resonating the excitation signal so as to
output a resonated signal;
display means for displaying tone-generation algorithms defined by
operation manners of the drive means and tone-generation means
respectively in form of the graphics or graphic patters; and
algorithm control means for varying the operation manners of the
drive means and tone-generation means displayed by the display
means and/or combining them so as to control the tone-generation
algorithms.
In a second aspect of the present invention, there is provided an
electronic musical instrument comprising:
sound source means for outputting a musical tone signal in
accordance with a tone-generation algorithm which is predefined for
each of instruments to be simulated;
display means for displaying the tone-generation algorithm in form
of a predetermined graphic pattern; and
algorithm control means for controlling the display means to
thereby vary the contents of the tone-generation algorithm in
accordance with an operation made by a performer.
BRIEF DESCRIPTION OF THE DRAWINGS
Further objects and advantages of the present invention will be
apparent from the following description, reference being had to the
accompanying drawings wherein the preferred embodiment of the
present invention is clearly shown.
In the drawings:
FIG. 1 is a block diagram showing the whole configuration of an
electronic musical instrument according to an embodiment of the
present invention;
FIG. 2 is a block diagram showing a detailed configuration of a
sound source shown in FIG. 1;
FIG. 3 is a system diagram showing a connection manner of DSPs used
in the sound source shown in FIG. 2;
FIG. 4 is a flowchart showing a main routine of an operation of the
present embodiment to be executed;
FIG. 5 is a flowchart showing an algorithm selection routine;
FIG. 6 is a flowchart showing a device selection routine;
FIG. 7 illustrates an example of a screen image of an initial menu
which is displayed by the present embodiment when the algorithm
selection routine is started;
FIG. 8 illustrates an example of a screen image for the device
selection to be displayed when the device selection routine is
started;
FIG. 9 is a flowchart showing a parameter setting routine;
FIGS. 10 to 13 are drawings each illustrating an example of a
screen image to be displayed when the parameter setting routine is
executed;
FIG. 14 is a flowchart showing a play routine;
FIG. 15 is a flowchart showing a sub-routine of the play routine
which is used for explaining a drive portion control routine, a
tone-generation portion control routine and a resonance-radiation
portion control routine to be executed during execution of the play
routine;
FIG. 16 shows a conceptual configuration of internal registers of
each DSP; and
FIG. 17 is a flowchart showing a preset call routine.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Now, description will be given with respect to an embodiment of the
present invention by referring to the drawings.
[A] Configuration
FIG. 1 is a block diagram showing the whole configuration of an
electronic musical instrument according to an embodiment of the
present invention. In FIG. 1, 1 designates a control portion which
controls several portions of this instrument in real-time manner.
This control portion 1 consists of a central processing unit (CPU)
1a, a program read-only memory (ROM) 1b, a data ROM 1c and a work
random-access memory (RAM) 1d. The CPU 1a up-loads programs read
from the program ROM 1b, and then it executes the loaded programs
so as to control several portions. In the present specification,
its operations will be described later. In addition to several
kinds of control programs to be used by the CPU 1a, the program ROM
1b memorizes other kinds of micro-programs to be loaded to the
digital signal processor (DSP), which operation will be described
later. Further, the data ROM 1c stores data tables which are used
for the data conversion. Furthermore, the work RAM 1d is used as
the work area of the CPU 1a, so that it temporarily stores several
kinds of data. Meanwhile, 2 designates a performance input device
which contains performance input elements such as the keyboard and
wheel so as to create performance information corresponding to the
operation to be made thereto by the performer. In addition, 3
designates several kinds of control elements such as the slide
volume-controls and key switches which are arranged on the control
panel (not shown). Further, 4 designates a display unit which is
configured as the LCD and the like, so that it is designed to
display the contents of several kinds of data given from the
foregoing control portion 1.
5 designates a sound source which simulates the tone-generation
mechanism of the non-electronic musical instrument, e.g., wind
instrument such as the clarinet, string-bowing-type instrument such
as the violin, string-plucking-type instrument such as the guitar
and string-striking-type instrument such as the piano. This sound
source 5 contains a drive unit 6, a tone-generation unit 7 and a
resonance-radiation unit 8. Each of them is configured by "DSP" and
"RAM", wherein "RAM" temporarily stores several kinds of operation
data of "DSP". Incidentally, configuration and operation of these
units 6-8 will be described later. Meanwhile, 9 designates a
digital-to-analog converter which converts the digital musical tone
signal outputted from the sound source 5 into the corresponding
analog signal. Further, 10 designates a sound system which
generates a musical tone corresponding to the musical tone signal
supplied thereto. Furthermore, 11 designates a pointing device made
by the mouse-type device and the like. This pointing device 11 is
used to point out the predetermined position in the display area of
the display unit 4.
Next, detailed description will be given with respect to the
above-mentioned sound source 5 by referring to FIGS. 2 and 3. FIG.
2 is a block diagram showing a functional configuration of the
sound source 5, wherein parts corresponding to those shown in FIG.
1 will be designated by the same numerals. In FIG. 2, CT designates
a control table to be set in the predetermined memory area of the
foregoing data ROM 1c. This control table CT is used to convert the
performance information, supplied thereto via the CPU 1a, into
sound source parameters. The drive unit 6 generates an excitation
signal corresponding to the instrument to be simulated, and this
excitation signal is supplied to the tone-generation unit 7. This
excitation signal corresponds to the energy which is required for
the tone generation. For example, when this drive unit 6 is
designed to simulate the wind instrument such as the clarinet, this
excitation signal corresponds to the blowing pressure or Embousure.
In drive unit 6, 6a designates a drive DSP which embodies the
function of the drive unit 6. This drive DSP 6a is supplied with
micro-programs corresponding to the operation manner of the
instrument to be simulated. Thus, the drive DSP 6a creates the
excitation signal corresponding to the sound source parameters to
be set to its internal registers R1-R4. In the drive unit 6, two
filters 6b, 6b are respectively provided on the output line and
feedback line coupled to the tone-generation unit 7. Each of these
filters is provided for avoiding an anomalous oscillation of the
signal passing therethrough at the specific frequency. Herein,
filter coefficients of these filters, i.e., their frequency
characteristics are controlled by the drive DSP 6a. Further, two
buffers 6c, 6c shape waveforms of the stereo musical tone signal
(i.e., "Lout" and "Rout" signals) outputted from the drive DSP
6a.
The tone-generation unit 7 corresponds to the vibration source of
the instrument to be simulated, which consists of a tone-generation
DSP 7a, filters 7b, 7b, and buffers 7c, 7c. The tone-generation DSP
7a is supplied with the micro-programs which correspond to the
operation manner of the instrument to be simulated. Further, it
oscillates the excitation signal in response to the sound source
parameters set to the internal register R1-R4. The filters 7b, 7b
are designed to simulate the frequency characteristic corresponding
to the case where the musical tone sounded from the tone-generation
portion of the actual instrument is transmitted toward the
resonance-radiation portion or it is reflected by the
resonance-radiation portion and then returned back to the
tone-generation portion.
The resonance-radiation portion 8 embodies the resonance and
radiation characteristics of the instrument to be simulated, which
consists of a resonance-radiation DSP 8a and buffers 8b, 8b. This
resonance-radiation DSP 8a is supplied with the micro-programs
corresponding to the operation manner of the instrument to be
simulated. Further, it simulates the resonance-radiation
characteristic corresponding to the sound source parameters set to
the internal registers R1-R4.
Next, detailed description will be given with respect to
configurations of the internal registers R1-R4 provided in each of
the DSPs 6a, 7a, 8a by referring to FIG. 16. In FIG. 16, 40-42
designate internal register portions of the drive DSP 6a,
tone-generation DSP 7a and resonance-radiation DSP 8a respectively.
Each of these internal register portions 40-42 is divided into four
registers R1-R4, each of which is set with control parameter CP,
control device CD and control table CT. This control parameter CP
is the data which designates the operation of the instrument to be
simulated. For example, when the drive DSP 6a is designed to
simulate the string-bowing-type instrument such as the violin, data
representing the bowing velocity is set to CP(11) and data
representing the bowing pressure is set to CP(12). On the other
hand, the control device CD indicates the number of the performance
input element by which the performance information is supplied to
No.s (where s=1-4) register of each DSP. The control table CT is
used to carry out the "scaling" on the performance information
supplied from the performance input element designated by the
control device data CD.
In the sound source 5 which is configured as described above, the
excitation signal outputted from the drive unit 6 is subject to the
oscillation in the tone-generation unit 7, and the oscillated
signal is supplied to the resonance-radiation unit 8. In this
resonance-radiation unit 8 which simulates the reflection terminal
of the actual instrument, the oscillated signal is converted into
the feedback signal which is then returned to the unit 6 via the
unit 7. In the above-mentioned circulating of the signal, the
musical tone signal is to be formed. This musical tone signal is
outputted from the output terminals Lout, Rout of each of the DSPs
6a, 7a, 8a. Then, all of the musical tone signals are added and
mixed together in mixers 13, and consequently it is possible to
output the musical tone signal having the stereophonic
components.
Next, FIG. 3 is a system diagram for explaining the data
communication to be performed among the DSPs. Each of the DSPs 6a,
7a, 8a has the communication port having four channels by which
4-channel communication is carried out in time sharing manner. As
shown in FIG. 3, the data communication is made in the
predetermined order from "slot 1" to "slot 4" in time sharing
manner. At first timing corresponding to slot1, the excitation
signal outputted from "DSP6a(OUTI)" is supplied to "DSP7a(INJ)" via
a mixer 15, while the oscillated signal is supplied to "DSP7a(INK)"
from "DSP7a(OUTJ)".
At next timing of slot 2, the foregoing feedback signal from
"DSP8a(FBOK)" is supplied to "DSP7a(FBJ)" via the mixer 15, while
it is returned from "DSP7a(FBOJ)" to "DSP6a(FBI)". Thus, the signal
circulating is made in the closed-loop. Such signal circulation is
made at timings of slots 3 and 4.
At timing of slot 3, the musical tone signal corresponding to the
stereophonic left-channel component is outputted from
"DSP6a(Lout)", and it is inputted into "DSP7a(Lin)" via the mixer
15. Then, it is supplied from "DSP7a(Lout)" to "DSP8a(Lin)".
Thereafter, the final musical tone signal is outputted from
"DSP8a(Lout)". In this process, the DSP 7a adds the signal
oscillated therein to the input signal, while the DSP 8a adds the
signal oscillated therein to the output signal of DSP 7a. Thus,
function of the foregoing mixer 13 can be achieved. At next slot 4,
as similar to slot 3, the musical tone signal corresponding to the
stereophonic right-channel component is to be formed.
[B] Operation
Next, description will be given with respect to the operation of
the present embodiment by referring to FIGS. 4 to 17. First, when
the power is on in the electronic musical instrument according to
the present embodiment, main routine as shown in FIG. 4 is
activated, so that processing of the CPU 1a proceeds to step SA1.
In step SA1, several kinds of registers are reset, so that
initialization is carried out. In next step SA2, the CPU 1a inputs
switch setting information for the mode designation switch which is
contained in the foregoing control elements 3 in order to designate
the operation mode of the present electronic musical instrument. As
the operation modes, there are provided "play mode" (i.e., mode 0)
wherein the performance operation is made, "algorithm selection
mode" (i.e., mode 1) wherein the tone-generation algorithm of the
sound source 5 is selected, "device selection mode" (i.e., mode 2)
wherein the device for carrying out the performance operation is
selected and "parameter setting mode" (i.e., mode 3) wherein the
sound source parameters are set.
In next step SA3, the processing is delivered to one of steps
SA4-SA7 in response to the operation mode corresponding to the
setting manner (i.e., modes 0-3) of the above-mentioned mode
designation switch. More specifically, the processing proceeds to
step SA4 when "mode 1" is designated, while the processing proceeds
to step SA5 when "mode 2" is designated. In addition, the
processing proceeds to step SA6 when "mode 3" is designated, while
the processing proceeds to step SA7 when "mode 0" is
designated.
Next, description will be given with respect to the operation of
the present embodiment in each mode.
1 Algorithm Selection Mode
When the mode designation switch is set at mode 1, the processing
proceeds to step SA4 in accordance with the judgement result of
step SA3, so that algorithm selection routine is to be activated.
When the algorithm selection routine is started, algorithm display
program (not shown) is executed, so that the display unit 4 will
display an image of the initial menu as shown in FIG. 7.
This initial menu is a graphic image of the foregoing algorithm of
the sound source 5. Hereinafter, description will be given with
respect to this initial menu. In FIG. 7, 20 designates a sound
source algorithm display portion which represents the operation
manner of the sound source 5. This portion 20 displays the
micro-programs by which the drive unit 6, tone-generation unit 7
and resonance-radiation unit 8 are respectively operated in form of
"icon". This "icon" illustrates the operation manner of the
instrument to be simulated by each of the units 6 to 8. In the
present example, icon of drive portion i representing the operation
of the drive unit 6 illustrates "string-striking 1" wherein the
hammer strikes the string; icon of tone-generation portion j
representing the operation of the tone-generation unit 7
illustrates "1-hole tube"; and icon of resonance-radiation portion
k representing the operation of the resonance-radiation unit 8
illustrates "tapered tube". As each of the above-mentioned drive
portion i, tone-generation portion j and resonance-radiation
portion k, it is possible to select desirable icon by the process
of the algorithm selection routine which will be described later.
More specifically, it is possible to select one of icons i-1 to i-5
for the drive portion i, icons j-1 to j-5 for the tone-generation
portion j and icons k-1 to k-5 for the resonance-radiation portion
k.
Next, description will be given with respect to the algorithm
selection routine by which desirable icon is selected so is to set
the desirable tone-generation algorithm of the sound source 5 by
referring to FIG. 5. First, when the display operation of the
foregoing initial menu is completed, the processing proceeds to
step SB1. When the mouse-type device is used as the pointing device
11, icon selected by this mouse-type device is registered to the
sound source algorithm display portion 20 in step SB1. For example,
when icons i-1 (i.e., string-striking), j-1 (single string) and k-2
(small box) are respectively selected for the drive portion i,
tone-generation portion j and resonance-radiation portion k, the
sound source algorithm simulating the violin is registered to the
display portion 20. In next step SB2, algorithm data (i,j,k) which
is registered to the display portion 20 as described above is read
by the CPU 1a. In response to the read data (i,j,k), the CPU 1a
reads out the corresponding micro-programs from the program ROM 1b.
Then, the read micro-programs are respectively loaded to the drive
DSP 6a, tone-generation DSP 7a and resonance-radiation DSP 8a in
accordance with the algorithm data (i,j,k). Thus, each DSP is
controlled to be in the operation manner corresponding to the
selected algorithm.
In next step SB3, the contents of the control table CT is renewed
on the basis of the algorithm data (i,j,k) and performance input
device data CD. As described before, this performance input device
data CD indicates the number of the performance input element by
which the performance data is supplied to No.s (where s=1-4)
register of each DSP. The control table CT memorizes table
addresses which are used to carry out the scaling operation on the
output data of the performance input element designated by the data
CD.
In step SB3, the contents of the control table CT is renewed on the
basis of the foregoing algorithm data (i,j,k) and performance input
device data CD of each portion. As described before, the
performance input device data CD represents the number of the
performance input element by which the performance data is supplied
to No.s (where s=1-4) register of each DSP. In addition, the
control table CT memorizes the table addresses which are used when
carrying out the scaling operation on the output data of the
performance input element designated by the data CD.
In last step SB4, in each of DSPs 6a, 7a, 8a, the sound source
parameter designated by the control table CT and device data CD is
set as its initial value. As a result, each DSP functions to
simulate the selected instrument. Thereafter, the processing
returns to the foregoing main routine as shown in FIG. 4.
2 Device Selection Mode
When the mode designation switch is set at mode 2, the processing
proceeds to step SA5 in accordance with the judgement result of
step SA3 in FIG. 4, so that the device selection routine is
activated. When this device selection routine is activated, device
display program (not shown) is executed, so that the display unit 4
displays a screen image of device selection menu as shown in FIG.
8.
This device selection image is a graphic display image in which
each DSP of the sound source 5 is controlled on the basis of the
information of certain performance input element. Hereinafter,
description will be given with respect to this device selection
image. In FIG. 8, 30 designates a display portion which displays
the performance input element registered as the performance input
device. In the present embodiment, keyboard 30a, wheel 30b, joy
stick 30c and portamento bar 30d are registered as the performance
input elements displayed in the display portion 30, for example. On
the other hand, 31 designates another display portion which
displays the operation manner of each of the DSPs contained in the
sound source 5, i.e., contents of the instrument to be selected for
each portion under operation of the foregoing algorithm selection
routine. In an example of FIG. 8, the bow (i.e., string-bowing
type) is set in a drive portion 31a, and bowing velocity, bowing
pressure and filter are set as the sound source parameters. In
addition, the string is set in a tone-generation portion 31b, and
delay length, delay ratio, filter and loop gain are set as the
sound source parameters. Further, metal board is set in a
resonance-radiation portion 31c, and pan, depth and filter are set
as the sound source parameters.
As described above, the operation parameters are set in each
portion. Then, these portions are connected to respective
performance input elements, which are registered on the basis of
the foregoing device data, on the screen. Thus, the user can
identify the control relationship between the performance input
element and DSP with ease.
Next, description will be given with respect to the device
selection routine by referring to FIG. 6 wherein the performance
input element is determined by use of the displayed connection.
When the device selection menu is completed, the processing
proceeds to step SC1 in FIG. 6 wherein it is judged whether or not
the currently registered performance input element is changed. This
step judges that the performance input element is changed when the
displayed connection information is changed by the pointing device
11 such as the mouse-type device. When there is a change, the
judgement result of step SC1 turns to "YES", so that the processing
proceeds to step SC2 wherein the displayed connection is changed in
accordance with the change made by the pointing device 11. For
example, when the pointing device 11 is operated to connect
"keycode" of the keyboard 30a in FIG. 8 with "control 1" of the
drive portion 31a, the previous displayed connection is changed
such that "keycode" is connected to "control 1". In next step SC3,
the contents of the control table CT is set again in response to
the changed performance input element. Then, the processing
proceeds to step SC4 wherein new control device data CD is set in
response to the above-mentioned change.
Meanwhile, if no change is made in the device selection menu so
that the previous displayed connection is remained as it is, the
judgement result of step SC1 turns to "NO", so that the processing
directly proceeds to step SC4 wherein only the device data CD is
renewed. In next step SC5, the table address of the control table
CT is renewed in accordance with the contents of the control table
CT which is set in the foregoing process of step SC3. Thereafter,
the processing returns to the main routine. As a result, each DSP
will operate in response to the function of the performance input
element of which operation is newly defined. Thus, it is possible
to arbitrarily define the function of the performance input
element. Therefore, in addition to the normal performance
technique, it is possible to carry out another performance
technique by use of the same performance input element. For
example, performance of the stringed instrument can be made by use
of the keyboard.
3 Parameter Setting Mode
When the mode designation switch is set at mode 3, the processing
proceeds to step SA6 in accordance with the judgement result of
step SA3, so that the parameter setting routine is activated. In
this parameter setting routine, the present system carries out the
editing operation on the control parameters to be set to the drive
DSP 6a, tone-generation DSP 7a and resonance-radiation DSP 8a, and
it also carries out the graphic display of the whole algorithm in
the sound source 5.
First, when this routine is activated, the processing of CPU 1a
proceeds to step SD1 in FIG. 9, wherein the display unit 4 displays
the contents of the control parameter CP of the DSP to be edited as
the text display. Herein, the operator input digits in accordance
with the prompt text (corresponding to edit parts). Such digit
input in the edit part has the following meanings.
i) Edit part "1": control parameter CP in the drive DSP 6a is to be
edited.
ii) Edit part "2": control parameter CP in the tone-generation DSP
7a is to be edited.
iii) Edit part "3": control parameter CP in the resonance-radiation
DSP 8a is to be edited.
iv) Edit part "0": no editing is made, so that the tone-generation
is made on the basis of the control parameters CP which are
currently set.
Thereafter, the processing proceeds to step SD2 wherein the input
digit is judged, so that the processing branches to the desirable
step corresponding to the input digit. For example, when "1" is
inputted, the processing proceeds to step SD3 wherein the control
parameter CP in the drive DSP 6a is to be edited. Such editing
operation is made by the graphic display of the algorithm of the
drive unit 6 as shown in FIG. 13. FIG. 13 illustrates an example of
the graphic display which represents the algorithm simulating the
operation of the reed such as the clarinet. In this example, the
filter and non-linear table which simulates the non-linear
operation of the reed are displayed. Herein, it is possible for the
operator to change them or add new parameters.
Next, when "2" is inputted, the processing proceeds to step SD4
wherein the control parameter CP of the resonance-radiation DSP 8a
is to be edited. This editing operation is made by the graphic
display of the algorithm of the tone-generation unit 7 as
illustrated in FIGS. 11, 12. FIG. 12 illustrates an example which
displays the algorithm simulating the tone-generation mechanism of
the string such as the guitar. As the control parameters CP, this
example uses the filter which simulates the string vibration and
the vibration applying point on the string. Herein, it is possible
to change them or add new parameters.
Next, when "3" is inputted, the processing proceeds to step SD5
wherein the control parameter CP of the resonance-radiation DSP 8a
is to be edited. This editing operation is made by the graphic
display of the algorithm of the resonance-radiation unit 8 as shown
in FIG. 10. FIG. 10 illustrates an example which displays the
algorithm simulating the resonance radiation of the tapered tube.
As the control parameters, this example uses the data defining the
shape of this tapered tube, i.e., position of the tube, its radius,
number of stages and horn length. Herein, it is possible to change
them or add new parameters.
After completing each of the processes of steps SD3 to SD5, the
processing proceeds to step SD6 wherein it is judged whether or not
the control parameter CP of each DSP is changed. If the control
parameter CP is added or corrected, the judgement result of step
SD6 turns to "YES", so that the processing proceeds to step SD7
wherein on the basis of the changed control parameter CP, the sound
source 5 is driven to make a sounding test. In this sounding test,
gain balance of the closed loop of the sound source 5 is adjusted
to avoid the anomalous oscillation. In next step SD8, data table is
made in order to generate sounds of each musical scale having the
fundamental pitch under the operation manner of the instrument to
be simulated, i.e., instrument which is defined by the control
parameters CP.
Meanwhile, if the judgement result of step SD6 is "NO", or if "0"
is inputted in the process of step SD1, the processing proceeds to
step SD9 representing the play routine which will be described
later. In this routine, the tone-generation is carried out on the
basis of the control parameters CP to be set in each DSP.
Incidentally, detailed description will be made later with respect
to this play routine.
In next step SD10, it is judged whether or not the edited control
parameter CP is written into the writable non-volatile memory (not
shown). If the operator decides to register the edited control
parameter into the memory by referring to the result of the
tone-generation process described before, such decision is inputted
by the key-in operation, so that the judgement result of step SD10
turns to "NO". Then, the processing proceeds to step SD11. If not,
the judgement result of step SD10 turns to "NO", so that the
processing returns to the foregoing main routine. In this case, the
control parameters CP are temporarily stored in the register of the
CPU 1a. Therefore, they are erased with the power off.
In step SD11, the operator inputs the present number PN which is
used when registering the edited control parameter CP into the
memory. In next step SD12, all of the sound source parameters are
registered in the predetermined memory area designated by the
inputted present number PN. Then, the processing proceeds to step
SD13. Herein, all of the sound source parameters contains the
control parameters CP, control device data CD and control table
data CT. In last step SD13, the current operation mode, i.e.,
parameter setting mode (i.e., mode 3) is reset to the play mode
(i.e., mode 0). Thus, processes of this routine is completed.
4 Play Mode
This mode is activated when the edited control parameters CP are
registered into the memory as described before, or when the mode
designation switch is set at mode 0. Herein, according to the
judgement result of step SA3, the processing proceeds to step SA7,
so that the play routine as shown in FIG. 14 is to be started. In
this play routine, each of the data set in the internal registers
40-42 of the DSPs as shown in FIG. 16 is read out, so that the
musical tone of the simulating instrument can be generated in
response to the performing operation.
In first step SE1 of this routine, the drive-portion control
routine, as shown in FIG. 15, is started, so that the processing
proceeds to step SF1. In step SF1, a variable "s" representing each
of the registers is set at "1" in order to read out each of the
data to be set to the internal register 40 of the drive DSP 6a. In
next step SF1, it is judged whether or not the control parameter
CP(11) is not at "0" and the variable s is larger than "4". If some
data is set as the control parameter CP(11), the judgement result
of step SF2 turns to "NO", so that the processing proceeds to step
SF3. In step SF3, the performance information of the performance
input element designated by the control device data CD(11) is read,
and then the processing proceeds to step SF4 wherein the scaling
operation is carried out on the read performance data by use of the
data table designated by the control table CT(11). In step SF5, the
scaled data is written into the internal register R1 in the drive
DSP 6a. Thus, the DSP 6a generates the foregoing excitation signal.
In next step SF6, the foregoing variable s is incremented so as to
repeat the above-mentioned processes. Thereafter, until the control
parameter CP(1s) becomes equal to "0", i.e., until no control
parameter is existed, the read-out operation is made repeatedly on
each data. As a result, the DSP 6a can sequentially correct the
excitation signals in response to the other control parameters
CP.
Next, when the processing proceeds to step SE2 in FIG. 14, the
tone-generation-portion control routine is to be started. In this
tone-generation-portion control routine, processes as similar to
those of the foregoing step SE1 are executed. More specifically, in
order to read out each of the data to be set in the internal
register 41 of the tone-generation DSP 7a, the CPU 1a sets the
variable s representing each of the register at "1". Next, it is
judged whether or not the control parameter CP(21) is not at "0"
and variable s is larger than "4". If some data is set as the
control parameter CP(21), the CPU 1a reads in the performance
information of the performance input element designated by the
control device data CD(21) so as to carry out the scaling operation
on the read performance information by use of the data table
designated by the control table CT(21). Then, the scaled data is
written into the internal register R1 in the DSP 7a. The
above-mentioned processes are repeatedly executed every time the
variable s is incremented. Until the control parameter CP(2s)
becomes equal to "0", i.e., until no control parameter CP is
existed, the read-out operation is made repeatedly on each data.
Thus, the DSP 7a can carry out the tone-generation operation of the
instrument to be simulated, and it also oscillates the excitation
signal supplied from the drive portion 6.
In next step SE3, the resonance-radiation-portion control routine
is started. In this resonance-radiation-portion control routine,
processes as similar to those of the foregoing steps SE1, SE2 are
executed, so that the DSP 8a can reproduce the resonance-radiation
characteristic of the instrument to be simulated.
As described above, in the steps SE1 to SE3, each of the DSPs is
operated in response to the set tone-generation algorithm, assigned
performance input element and set control parameters CP which are
made in the foregoing modes 1-3, thus, it is possible to perform a
music by the desirable musical tones.
By the way, when changing the tone color of the musical tone which
is generating now by the performing operation, the read-out
operation is made on the preset data which is registered in the
foregoing parameter setting mode. Herein, the preset data indicate
the foregoing all sound source parameters and micro-programs which
define the tone-generation algorithms of each DSP. In order to
carry out such data read-out operation, the preset switch provided
in the control elements 3 is operated. When this preset switch is
operated, the CPU 1a detects its switch on-event, so that the
preset call routine of step SE4 is started. When this preset call
routine is started, the processing of the CPU 1a proceeds to step
SG1 shown in FIG. 17. In step SG1, the CPU 1a reads the
identification number PN of the preset switch to be operated. In
next step SG2, in accordance with the read-out address which is
defined by the read identification number PN of the preset switch,
the preset data is read from the non-volatile memory. Then, the
micro-programs in the read preset data are respectively delivered
to the DSPs. In next step SG3, the control device data CD in the
read preset data is written into the predetermined work memory.
Next, the processing proceeds to step SG4 wherein the control
parameter CP set to each DSP is rewritten into the preset value.
Thus, each DSP operates to simulate the instrument defined by the
preset value, and consequently it is possible to perform a music
with the musical tone having the different tone color.
Lastly, this invention may be practiced or embodied in still other
ways without departing from the spirit or essential character
thereof as described heretofore. Therefore, the preferred
embodiment described herein is illustrative and not restrictive,
the scope of the invention being indicated by the appended claims
and all variations which come within the meaning of the claims are
intended to be embraced therein.
* * * * *