U.S. patent application number 15/041209 was filed with the patent office on 2016-06-09 for method and apparatus for generating side information bitstream of multi-object audio signal.
This patent application is currently assigned to Electronics and Telecommunications Research Institute. The applicant listed for this patent is Electronics and Telecommunications Research Institute. Invention is credited to Chieteuk AHN, Seung-Kwon BEACK, Jin-Woo HONG, Dae-Young JANG, Kyeongok KANG, Jin-Woong KIM, Tae-Jin LEE, Yong-Ju LEE, Jeong-Il SEO.
Application Number | 20160165375 15/041209 |
Document ID | / |
Family ID | 41136037 |
Filed Date | 2016-06-09 |
United States Patent
Application |
20160165375 |
Kind Code |
A1 |
SEO; Jeong-Il ; et
al. |
June 9, 2016 |
METHOD AND APPARATUS FOR GENERATING SIDE INFORMATION BITSTREAM OF
MULTI-OBJECT AUDIO SIGNAL
Abstract
Provided is a method and apparatus for generating a side
information bitstream of a multi-object audio signal. The apparatus
for generating a side information bitstream of a multi-object audio
signal includes a spatial cue information input unit configured to
receive spatial cue information generated in an encoder of the
multi-object audio signal, a preset information input unit
configured to receive preset information for the multi-object audio
signal, and a side information bitstream generator configured to
generate the side information bitstream based on the spatial cue
information and the preset information. The side information
bitstream includes a header region and a frame region, and the
preset information is included in the frame region.
Inventors: |
SEO; Jeong-Il; (Daejeon,
KR) ; BEACK; Seung-Kwon; (Seoul, KR) ; LEE;
Tae-Jin; (Daejeon, KR) ; LEE; Yong-Ju;
(Daejeon, KR) ; JANG; Dae-Young; (Daejeon, KR)
; KANG; Kyeongok; (Daejeon, KR) ; HONG;
Jin-Woo; (Daejeon, KR) ; KIM; Jin-Woong;
(Daejeon, KR) ; AHN; Chieteuk; (Daejeon,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Electronics and Telecommunications Research Institute |
Daejeon |
|
KR |
|
|
Assignee: |
Electronics and Telecommunications
Research Institute
Daejeon
KR
|
Family ID: |
41136037 |
Appl. No.: |
15/041209 |
Filed: |
February 11, 2016 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
12933019 |
Sep 16, 2010 |
9299352 |
|
|
PCT/KR2009/001615 |
Mar 30, 2009 |
|
|
|
15041209 |
|
|
|
|
Current U.S.
Class: |
381/17 |
Current CPC
Class: |
G10L 19/008 20130101;
H04S 2400/11 20130101; H04S 2400/03 20130101; H04S 5/00 20130101;
H04S 7/308 20130101 |
International
Class: |
H04S 7/00 20060101
H04S007/00; G10L 19/008 20060101 G10L019/008; H04S 5/00 20060101
H04S005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 31, 2008 |
KR |
10-2008-0029562 |
Apr 14, 2008 |
KR |
10-2008-0034161 |
Mar 23, 2009 |
KR |
10-2009-0024374 |
Claims
1. A apparatus for processing a multi-object audio signal
comprising: a processor configured to: receive a downmix signal
related to a plurality of audio objects; generate a plurality of
audio objects from the downmix signal; and render the plurality of
audio objects into a least one of channels using a preset
information related to audio object or a playback system, wherein
the preset information includes at least one of (i) a layout of a
playback system for a mono system, a stereo system and
multi-channel system, (ii) an audio object ID, (iii) object
location, (iv) object level and (v) a azimuth degree and an
elevation degree of the object.
2. The apparatus of claim 1, wherein the processor renders the
plurality of audio objects using preset information expressed in
matrix information configuring the layout and the object ID.
3. The apparatus of claim 1, wherein the preset information is used
to define audio scene for rendering the plurality of audio
objects.
4. The apparatus of claim 1, wherein the processor generates the
plurality of audio objects from the downmix signal using spatial
information.
5. The apparatus of claim 1, wherein the preset information is
extracted from a frame of bitstream.
6. The apparatus of claim 1, wherein the frame includes one or more
preset information.
7. A method for processing a multi-object audio signal performed by
a processor comprising: receiving a downmix signal related to a
plurality of audio objects; generating a plurality of audio objects
from the downmix signal; and rendering the plurality of audio
objects into a least one of channels using a preset information
related to audio object or a playback system, wherein the preset
information includes at least one of (i) a layout of a playback
system for a mono system, a stereo system and multi-channel system,
(ii) an audio object ID, (iii) object location, (iv) object level
and (v) a azimuth degree and an elevation degree of the object.
8. The method of claim 7, wherein the rendering comprising:
rendering the plurality of audio objects using preset information
expressed in matrix information configuring the layout and the
object ID.
9. The method of claim 7, wherein the preset information is used to
define audio scene for rendering the plurality of audio
objects.
10. The method of claim 7, wherein the generating comprising:
generating the plurality of audio objects from the downmix signal
using spatial information.
11. The method of claim 7, wherein the preset information is
extracted from a frame of bitstream.
12. The method of claim 7, wherein the frame includes one or more
preset information
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 12/933,019, filed Sep. 16, 2010, which is a 35
U.S.C. .sctn.371 national stage filing of PCT Application No.
PCT/KR2009/001615 filed on Mar. 30, 2009, which claims priority to,
and the benefit of, Korean Patent Application No. 10-2008-0029562
filed on Mar. 31, 2008, Korean Patent Application No.
10-2008-0034161 filed on Apr. 14, 2008 and Korean Patent
Application No. 10-2008-0024374 filed on Mar. 23, 2009. The
contents of the aforementioned applications are hereby incorporated
by reference.
TECHNICAL FIELD
[0002] The present invention relates to a method and apparatus for
generating a side information bitstream of a multi-object audio
signal.
[0003] This work was supported by the IT R&D program of
MIC/IITA [2008-F-011-01, Developing Next Generation DTV Core
Technology (Standardization Linkage), Developing Autostereoscopic
Personal 3-D Broadcasting Technology (Continued)].
BACKGROUND ART
[0004] A conventional technology for encoding and decoding an audio
signal does not combine different types of audio objects such as a
mono-channel audio object, a stereo channel audio object, and a
multi-channel audio object. That is, the conventional audio signal
encoding and decoding technology did not allow a user to consume
one type of audio contents in diverse ways. Accordingly, a user has
passively consumed the audio contents.
[0005] A spatial audio coding (SAC) technology encodes a
multi-channel audio signal into a down-mixed mono-channel signal or
a down-mixed stereo channel signal with spatial cue information and
transmits a high quality multi-channel signal even at a low bit
rate. The SAC technology also analyzes an audio signal by each
sub-band and restores an original multi-channel audio signal from
the down-mixed mono-channel signal or the down-mixed stereo channel
signal based on spatial cue information corresponding to each
sub-band. The spatial cue information includes information for
restoring an original signal in a decoding process and decides the
quality of an audio signal to be reproduced in a SAC decoding
apparatus. MPEG has been progressed the standardization of the SAC
technology as MPEG Surround (MPS) and has used channel level
difference as a main spatial cue.
[0006] Since the SAC technology allows encoding and decoding a
multi-channel audio signal formed of only one audio object type, it
is impossible to encode or decode an audio signal having various
types of audio objects such as a mono-channel audio object, a
stereo channel audio object, or a multi-channel audio object such
as 5.1 channels using the SAC technology.
[0007] A binaural cue coding (BCC) technology according to the
prior art was introduced to encode or decode a multi-object audio
signal formed of mono-channel audio objects. However, a
multi-object audio signal formed of multiple channel audio objects
could not be encoded or decoded using the binaural cue coding BCC
technology.
[0008] As described above, the conventional audio encoding and
decoding technologies cannot be used to encode or decode a
multi-object audio signal having multi-channel audio objects
although a single object audio signal formed of multi-channel audio
objects or a multi-object audio signal formed of mono-channel audio
objects. Therefore, a plurality of different channel audio objects
cannot be combined based on the conventional audio encoding and
decoding technologies. That is, a user could not consume one type
of audio contents in various ways. The conventional audio encoding
and decoding technology allows a user only to passively consume
audio contents.
DISCLOSURE
[0009] 1. Technical Problem
[0010] An embodiment of the present invention is directed to
providing a method and apparatus for changing audio scene
information set-up (ex. Preset) according to the intention of a
sound engineer or an editor while reproducing a multi-object audio
signal by including preset information in a frame region of the
side information bitstream that is generated when the multi-object
audio signal is encoded.
[0011] Other objects and advantages of the present invention can be
understood by the following description, and become apparent with
reference to the embodiments of the present invention. Also, it is
obvious to those skilled in the art of the present invention that
the objects and advantages of the present invention can be realized
by the means as claimed and combinations thereof.
[0012] 2. Technical Solution
[0013] In accordance with an aspect of the present invention, there
is provided an apparatus for generating a side information
bitstream of a multi-object audio signal, including a spatial cue
information input unit configured to receive spatial cue
information generated in an encoder of the multi-object audio
signal, a preset information input unit configured to receive
preset information for the multi-object audio signal, and a side
information bitstream generator configured to generate the side
information bitstream based on the spatial cue information and the
preset information, wherein the side information bitstream includes
a header region and a frame region, and the preset information is
included in the frame region.
[0014] In accordance with another aspect of the present invention,
there is provided an apparatus for analyzing a side information
bitstream of a multi-object audio signal, including a side
information bitstream input unit configured to receive the side
information bitstream, a spatial cue information extractor
configured to extract spatial cue information based on the side
information bitstream, and a preset information extractor
configured to extract preset information based on the side
information bitstream, wherein the side information bitstream
includes a header region and a frame region, and the preset
information is included in the frame region.
[0015] In accordance with another aspect of the present invention,
there is provided an apparatus for encoding a multi-object audio
signal, including an encoder configured to down-mix an audio signal
formed of a plurality of objects and generate spatial cue
information for an audio signal formed of the plurality of objects,
and a side bitstream generator configured to generate a side
information bitstream based on preset information for the spatial
cue information and the audio signal, wherein the side information
bitstream includes a header region and a frame region, and the
preset information is included in the frame region.
[0016] In accordance with another aspect of the present invention,
there is provided an apparatus for decoding a multi-object audio
signal, including a side information bitstream analyzer configured
to receive a side information bitstream and extract spatial cue
information and preset information included in the side information
bitstream, a decoder configured to restore an audio signal formed
of a plurality of audio objects based on the spatial cue
information from an input down-mixed audio signal, and a renderer
configured to render an audio signal formed of the plurality of
objects into an audio signal formed of a plurality of channels
based on the preset information, wherein the side information
bitstream includes a header region and a frame region, and the
preset information is included in the frame region.
[0017] In accordance with another aspect of the present invention,
there is provided a method for generating a side information
bitstream of a multi-object audio signal, including receiving
spatial cue information generated in an encoder of the multi-object
audio signal, receiving preset information of the multi-object
audio signal, and generating the side information bitstream based
on the spatial cue information and the preset information, wherein
the side information bitstream includes a header region and a frame
region, and the preset information is included in the frame
region.
[0018] In accordance with another aspect of the present invention,
there is provided a method for analyzing a side information
bitstream of a multi-object audio signal, including receiving the
side information bitstream, extracting spatial cue information
based on the side information bitstream, and extracting preset
information based on the side information bitstream, wherein the
side information bitstream includes a header region and a frame
region, and the preset information is included in the frame
region.
[0019] In accordance with another aspect of the present invention,
there is provided a method for encoding a multi-object audio
signal, including: down-mixing an audio signal formed of a
plurality of objects and generating spatial cue information for an
audio signal formed of a plurality of objects, and generating a
side information bitstream based on preset information for the
spatial cue information and the audio signal, wherein the side
information bitstream includes a header region and a frame region,
and the preset information is included in the frame region.
[0020] In accordance with another aspect of the present invention,
there is provided a method for decoding a multi-object audio
signal, including: receiving a side information bitstream and
extracting spatial cue information and preset information included
in the side bitstream; restoring an audio signal formed of a
plurality of objects based on the spatial cue information from an
input down-mixed audio signal; and rendering the audio signal
formed of the plurality of objects to an audio signal formed of a
plurality of channels based on the preset information, wherein the
side information bitstream includes a header region and a frame
region, and the preset information is included in the frame
region.
[0021] 3. Advantageous Effects
[0022] A method and apparatus for generating a side information
bitstream of a multi-object audio signal according to an embodiment
of the present invention advantageously enables changing audio
scene information set up according to the intention of an editor or
a sound engineer while reproducing a multi-object audio signal by
including preset information in a frame region of a side
information bitstream generated when a multi-object audio signal is
encoded.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1 is a diagram describing encoding, decoding, and
rendering a multi-object audio signal in accordance with an
embodiment of the present invention.
[0024] FIG. 2 illustrates a structure of a side information
bitstream generated using a multi-object audio signal.
[0025] FIG. 3 illustrates a structure of a side information
bitstream in accordance with an embodiment of the present
invention.
[0026] FIG. 4 illustrates a structure of a side information
bitstream in accordance with another embodiment of the present
invention.
[0027] FIG. 5 illustrates a structure of a side information
bitstream in accordance with still another embodiment of the
present invention.
BEST MODE FOR THE INVENTION
[0028] The advantages, features and aspects of the invention will
become apparent from the following description of the embodiments
with reference to the accompanying drawings, which is set forth
hereinafter. When it is considered detailed description on a prior
art may obscure a point of the present invention, the description
will not be provided herein.
[0029] The present invention relates a technology for compressing
and decompressing a multi-channel/multi-object audio signal.
Multi-object audio encoding is a technology for compressing
different audio objects together and transmitting the compressed
audio objects. The multi-object audio encoding technology was
developed based on a spatial audio coding (SAC) technology.
[0030] In a process of decoding a multi-object audio signal, an
input audio signal formed of multi-objects is down-mixed and
transmitted to a decoding apparatus. Here, a side information
bitstream is transmitted with the down-mixed signal. The side
information bitstream includes information necessary to reproduce a
multi-object audio signal. The information for reproducing a
multi-object audio signal includes preset audio scene information
(Preset-AS I). Audiences of a multi-object audio signal can enjoy
various audio scenes using the preset information that is set up by
and provided from an editor or a sound engineer.
[0031] The side information bitstream is divided into a header
region and a frame region. The preset information is only included
in the header region. Accordingly, an audience is provided with
only default preset information stored in the header region. After
providing the default preset information, it is impossible to
update the preset information.
[0032] In order to overcome the problem, an embodiment of the
present invention provides a technology for providing realistic
audio scenes to audiences by updating the preset information while
reproducing a multi-object audio signal. In order to update the
preset information, a method and apparatus for generating a side
information bitstream according to the present invention includes
the preset information in a frame region of the sub information
bitstream. That is, a method and apparatus for generating a side
information bitstream according to the present invention enables an
audience to receive not only default preset information included in
a header region but also optional preset information included in
each frame by including the preset information in the frame region
and transmitting the preset information with the frame region.
[0033] For example, a chorus sound source is located at the front
of a stage with a main vocal sound source when a corresponding
audio signal is initially reproduced. Updated preset information
may relocate the chorus sound source to the rear of the stage at a
predetermined time during reproducing the audio signal. As another
example, it is possible to move a location of a chorus sound source
from the front of a stage or the rear of the stage according to
time during reproducing the audio signal. The method and apparatus
for generating a side information bitstream according to the
present invention can improve a sound field of an audio signal or
form a dynamic sound scene.
[0034] Hereinafter, a method and apparatus for generating a side
information bitstream according to the present invention will be
described with reference to the accompanying drawings. Like numeral
references denote like elements throughout the accompanying
drawings.
[0035] FIG. 1 is a diagram for describing encoding, decoding, and
rendering a multi-object audio signal in accordance with an
embodiment of the present invention.
[0036] Referring to FIG. 1, a multi-object audio signal is encoded,
decoded, and rendered through a SAOC encoder 102, a bitstream
formatter 104, a SAOC decoder 106, a bitstream analyzer 108, a
rendering matrix generator 110, and a renderer 112 according to the
present embodiment.
[0037] In multi-object spatial audio object coding (SAOC), a signal
inputted as an audio object is encoded. Each of audio objects is
restored by a decoder. The restored objects are not independently
reproduced. The restored objects are rendered based on information
about audio objects for forming a specific audio scene and
outputted as a multi-object audio signal. Therefore, it is
necessary to have an apparatus for rendering information about
input audio objects in order to obtain a predetermined audio scene
based on a multi-object audio signal.
[0038] The SAOC encoder 102 is a spatial cue based encoder and
encodes an input audio signal as an audio object. Here, the audio
object inputted to the SAOC encoder 102 may be a mono-channel audio
signal or a stereo channel audio signal. The SAOC encoder 102
outputs a down-mixed signal by encoding more than one audio object.
The outputted down-mixed signal may be a mono signal or a stereo
signal. The SAOC encoder 102 extracts spatial cue parameters
related to multi-object necessary to decode the down-mixed signal.
The SAOC encoder 102 may analyze an input audio object signal based
on a Heterogeneous Layout SAOC scheme or a Faller scheme.
[0039] The extracted spatial cue parameter includes spatial cue
information. The spatial cue is analyzed and extracted by a unit of
a frequency domain sub-band. The spatial cue is information used
for encoding and decoding an audio signal. The spatial cue is
extracted from a frequency domain and includes information about
amplitude different, delay difference, and correlation between two
signals. For example, the spatial cue includes channel level
difference (CLD), inter-channel level difference (ICLD), inter
channel time difference (ICTD), inter channel correlation (ICC),
and virtual source location information. However, the present
invention is not limited thereto.
[0040] The spatial cue parameter includes information for restoring
and controlling spatial cue and an audio signal. Particularly,
header information included in a spatial cue parameter includes
information for restoring and reproducing a multi-object audio
signal formed of various channel type audio objects and defines
channel information about an audio object and an ID of a
corresponding audio object, thereby providing decoding information
about mono-channel audio objects, stereo channel audio objects, and
multi-channel audio objects. For example, the header information
may include information of Identification (ID) or an object that
enables identifying whether a coded audio object is a mono-channel
audio signal or a stereo channel audio signal.
[0041] The bitstream formatter 104 generates a side information
bitstream (SAOC bitstream) based on preset information (Preset-ASI)
from an external device and the spatial cue parameters transferred
from the SAOC encoder 102.
[0042] The SAOC decoder 106 restores the down-mixed signal from the
SAOC encoder 102 as a multi-object audio signal using the spatial
cue parameter outputted from the bitstream analyzer 108. The SAOC
decoder 106 may be replaced with a MPEG surround decoder and a BCC
decoder.
[0043] The bitstream analyzer 108 extracts spatial cue parameters
and preset information by analyzing the side information bitstream
outputted from the bitstream formatter 104. The extracted spatial
cue parameters are transferred to the SAOC decoder 106, and the
preset information is transferred to a rendering matrix generator
110.
[0044] The rendering matrix generator 110 generates a rendering
matrix using the preset information outputted from the bitstream
analyzer 108 and user control inputted from an external device. If
the preset information is not transmitted from the bitstream
analyzer 108, the preset information is set up as default.
[0045] The renderer 112 renders a multi-object audio signal
outputted from the SAOC decoder 106 to a multi-channel audio signal
using the rendered matrix outputted from the rendering matrix
generator 110.
[0046] Although encoding, decoding, and rendering the multi-object
audio signal according to the present embodiment were described
with reference to FIG. 1, the side information bitstream according
to the present invention is not limited thereto. That is, the
present invention may be identically applied to any structures for
rendering multi-object signals based on preset information included
in audio object signal.
[0047] FIG. 2 is a diagram for describing a structure of a side
information bitstream generated using a multi-object audio
signal.
[0048] As shown in FIG. 2, the side information bitstream includes
a header region and a frame region. The header region includes
header information, channel information of an audio object, ID
information of a corresponding audio object, the number of audio
objects by a channel. The frame region includes information about a
real audio signal, for example, spatial cue information.
[0049] The preset information means audio object control
information and speaker layout information. In more detail, the
preset information includes speaker layout information, audio
object location information, and level information in order to
properly produce an audio scene. The preset information may be
directly expressed or expressed in a matrix formation.
[0050] When the preset information is directly expressed, the
preset information may include information about a layout of a
playback system such as a mono system, a stereo system, and a
multi-channel system, an audio object ID, an audio object layout
(mono or stereo), an audio object location, azimuth such as 0
degree to 360 degree, elevation such as -50 degree to 90 degree,
and an audio object level such as -50 dB to 50 dB.
[0051] When the preset information is expressed in a matrix
formation, the preset information may have a form of a P matrix as
shown in Eq. 1. The preset information expressed in the matrix
includes power gain information to be mapped to an output channel
or phase information as element vectors.
P .circle-w/dot. W oj b = [ p 1 , 1 b p 1 , 2 b p 1 , N - 1 b p 2 ,
1 b p 2 , 2 b p 2 , N - 1 b p M , 1 b p M , 2 b p M , N - 1 b ]
Matrix I .circle-w/dot. [ w oj _ 1 b w oj _ 2 b w oj _ N - 1 b ] =
[ w ch _ 1 b , w ch _ 2 b w ch _ M b ] SAOC Eq . 1 ##EQU00001##
[0052] The preset information may define diverse audio scenes of
the same audio content to be proper to different reproducing
scenarios. For example, a plurality of preset information set up
for stereo or multichannel playback systems such as 5.1 channel and
7.1 channel playback systems can be generated to be proper to the
objective of a playback service or the intention of a contents
producer. A user may select one of audio scene information among
more than one audio scene information (ASI) included in the preset
information. The selected audio scene information is used to render
a multi-object audio signal of corresponding audio contents.
[0053] The side information bitstream includes preset information
for rendering a multi-object audio signal. Such preset information
was not included in a frame region according to the prior art. The
preset information was conventionally included in a header region
only. Therefore, a user or an audience was limitedly enabled to
enjoy a multi-object audio signal only using default preset
information included in the header region.
[0054] FIG. 3 illustrates a structure of a side information
bitstream in accordance with an embodiment of the present
invention.
[0055] Referring back to FIG. 2, the default preset information is
included in the header region only in the prior art. Therefore, it
is impossible to provide diverse preset information set up properly
to an environment varying during reproducing an audio signal or set
up properly the multiple intentions of a contents producer, an
editor, or a sound engineer. In order to overcome such a
shortcoming, the side information bitstream according to the
present embodiment includes preset information not only in a header
region but also in a frame region. Therefore, the side information
bitstream according to the present embodiment enables providing
preset information different from the default preset information
included in a header region at a predetermined time point (or
frame) while reproducing a multi-object image.
[0056] Referring to FIG. 3, a side information bitstream according
to the present embodiment includes a header region and a frame
region. The header region includes header information and default
preset information. Since the header information was already
described in detail, detail description thereof is omitted. The
default preset information may be provided to a user at an initial
stage of reproducing a multi-object audio signal.
[0057] The frame region includes more than one frame. As shown in
FIG. 3, the frame region includes a first frame, a second frame, .
. . , and an n.sup.th frame. Each of the frames may include a
plurality of information. FIG. 3 shows the frame region including
spatial cue information and preset information for convenience. As
shown in FIG. 3, a first frame may include not only first spatial
cue information but also first preset information. Similarly, the
second frame includes second spatial cue information with second
preset information.
[0058] By allocating a space in each frame to include preset
information, it is possible to provide preset information of a
corresponding frame while reproducing a multi-object audio signal.
For example, the bitstream analyzer 108 of FIG. 1 sequentially
analyzes a side information bitstream from the bitstream formatter
104. The bitstream analyzer 108 extracts default preset information
by analyzing the header region and continuously extracts preset
information included in a frame region by analyzing the frame
region. The bitstream analyzer 108 transmits the extracted preset
information to the rendering matrix generator 110. Therefore, the
bitstream analyzer 108 according to the present embodiment can
extract new preset information whenever the bitstream analyzer 108
analyzes each frame region and uses the extracted new preset
information to render a multi-object audio signal corresponding to
a corresponding frame.
[0059] The preset information can be used in various ways by
providing the preset information by each frame. For example, if a
frame including new preset information is received while rendering
each frame based on the default preset information of the header
region at an initial stage of reproducing a corresponding audio
signal, the new preset information may be applied only to render
the corresponding frame or the new preset information may be
applied for rendering remaining frames.
[0060] If another frame including different preset information is
received after applying the new preset information, the preset
information of the newly received frame will be applied to a
corresponding frame. As a method of using the default preset
information included in the header region, it is possible to
provide various preset information to a user by providing all of
the default preset information of the header region and the new
preset information included in corresponding frames.
[0061] FIG. 4 is a diagram illustrating a structure of a side
information bitstream in accordance with another embodiment of the
present invention.
[0062] Referring to FIG. 4, the side information bitstream includes
a header region and a frame region. The header region includes
header information and default preset information. The frame region
includes more than one frame such as a first frame, a second frame,
. . . , and a n.sup.th frame.
[0063] In FIG. 4, the first frame includes a plurality of preset
information such as first preset information and second preset
information. According to the side information bitstream according
to the present embodiment, a user receives more various preset
information at a period corresponding to the first frame than any
other period by including a plurality of preset information in one
frame as shown in FIG. 4.
[0064] Although not shown in FIG. 4, the second frame may also have
a plurality of preset information like the first frame. Or, the
second frame may not include any preset information.
[0065] Although it is not shown in FIG. 4, it is possible to
include preset information into each frame in regular pattern. For
example, the first frame includes three preset information, the
second frame includes no preset information, the third frame
includes three frames again, and the fourth frame includes no
preset information.
[0066] In addition, it is possible to include preset information
only into a particular frame region as shown in FIG. 4.
Furthermore, more than one frame may be included in the frame
region based on various applicable patterns.
[0067] By setting various regions to include preset information by
each frame as described above, it is possible to provide various
audio scene information about a multi-object audio signal
corresponding to each frame.
[0068] FIG. 5 is a diagram illustrating a structure of a side
information bitstream in accordance with another embodiment of the
present invention.
[0069] Referring to FIG. 5, the side information bitstream (SAOC
bitstream) includes a preset information region. (Preset-ASI
region). The preset information region includes a plurality of
preset information such as Preset-ASI (default), Preset-ASI (1) to
(N). One preset information includes audio object control
information and speaker layout information. As described above, the
preset information may be directly expressed or expressed in a
matrix formation. In case of directly expressing, the preset
information includes an object ID, an object type, a location, a
speaker layout, and sound level information as many as the number
of objects. As shown in FIG. 5, the preset information may be
expressed in a matrix having such elements as element vectors.
[0070] The above described method according to the present
invention can be embodied as a program and stored on a computer
readable recording medium. The computer readable recording medium
is any data storage device that can store data which can be
thereafter read by the computer system. The computer readable
recording medium includes a read-only memory (ROM), a random-access
memory (RAM), a CD-ROM, a floppy disk, a hard disk and an optical
magnetic disk.
[0071] The present application contains subject matter related to
Korean Patent Application No. 2008-0029562, filed in the Korean
Intellectual Property Office on Mar. 31, 2008, and Korean Patent
Application No. 2008-0034161, filed in the Korean Intellectual
Property Office on Apr. 14, 2008, the entire contents of which is
incorporated herein by reference.
[0072] While the present invention has been described with respect
to the specific embodiments, it will be apparent to those skilled
in the art that various changes and modifications may be made
without departing from the spirit and scope of the invention as
defined in the following claims.
* * * * *