U.S. patent application number 16/130839 was filed with the patent office on 2020-03-19 for equipment including down-firing speaker.
This patent application is currently assigned to Plantronics, Inc.. The applicant listed for this patent is Plantronics, Inc.. Invention is credited to John S. Graham, Jacob T. Meyberg Guzman, John A. Schaffer.
Application Number | 20200092638 16/130839 |
Document ID | / |
Family ID | 68000162 |
Filed Date | 2020-03-19 |
United States Patent
Application |
20200092638 |
Kind Code |
A1 |
Schaffer; John A. ; et
al. |
March 19, 2020 |
Equipment Including Down-Firing Speaker
Abstract
A desktop device comprises a housing having a bottom side
configured to face a surface on which the device is to be placed,
such as a desktop, and a front side configured to face a user of
the device. A down-firing speaker is placed inside the housing. A
speaker port is disposed on the bottom side of the housing. A horn
assembly on the housing is arranged to define a speaker horn in
combination with the surface on which the device is placed.
Inventors: |
Schaffer; John A.; (Albany,
CA) ; Meyberg Guzman; Jacob T.; (Santa Cruz, CA)
; Graham; John S.; (Scotts Valley, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Plantronics, Inc. |
Santa Cruz |
CA |
US |
|
|
Assignee: |
Plantronics, Inc.
Santa Cruz
CA
|
Family ID: |
68000162 |
Appl. No.: |
16/130839 |
Filed: |
September 13, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G10K 11/025 20130101;
H04M 1/035 20130101; H04R 1/025 20130101; H04R 27/00 20130101; H04R
1/04 20130101; H04M 1/6033 20130101; H04R 1/30 20130101; H04R 1/345
20130101; H04M 1/62 20130101 |
International
Class: |
H04R 1/34 20060101
H04R001/34; H04R 27/00 20060101 H04R027/00; H04R 1/30 20060101
H04R001/30 |
Claims
1. A desktop device, comprising: a housing having a bottom side
configured to face a surface on which the device is placed, a front
side and a speaker port on the bottom side; a down-firing speaker
facing the speaker port on the housing; and a horn assembly on the
housing arranged to define a speaker horn, the speaker horn having
a throat region proximal to the speaker port and a mouth proximal
to the front side of the housing, and first and second sidewalls
having proximal ends proximal to the speaker port and distal ends
proximal to the mouth, the first and second sidewalls being
separated by a first width W1 proximal to the speaker port, and the
distal ends of the first and second sidewalls being separated by a
second width W2 proximal to the mouth, where W2 is greater than
W1.
2. The device of claim 1, wherein the speaker comprises a diaphragm
and a phase plug, the phase plug having an aperture or apertures
opening into the speaker port.
3. (canceled)
4. The device of claim 1, wherein first and second sidewalls have a
first height H1 proximal to the speaker port, and the distal ends
of the first and second sidewalls have a second height H2 proximal
to the mouth, where H2 is greater than H1.
5. The device of claim 1, wherein the speaker comprises a diaphragm
and a phase plug, the phase plug having an aperture or apertures
opening into the speaker port; and including a ring disposed in the
speaker port around a perimeter of the phase plug, the ring having
a smooth outside surface defining an inside wall of the horn
assembly at the speaker port.
6. The device of claim 1, wherein the horn assembly is arranged so
that the speaker horn has substantially continuously increasing
volume from the throat region to the mouth.
7. The device of claim 1, including a microphone and a microphone
port, the microphone port being located on the housing in a
position spaced laterally away from the horn assembly so that
dispersion of acoustic energy in air from the speaker is diverted
from the microphone port by a sidewall of the horn assembly.
8. The device of claim 1, including a microphone and a microphone
port, the microphone port being located on the housing in a
position spaced laterally away from the first sidewall.
9. The device of claim 8, wherein the first sidewall includes a
surface pad configured to contact the surface along a majority of
its length from the throat region to the mouth, and the second
sidewall is configured to sit above the surface along a majority of
its length from the throat region to the mouth.
10. The device of claim 1, wherein the speaker comprises a
diaphragm and a phase plug, the phase plug having an aperture or
apertures opening into the speaker port; and the horn assembly
includes a ring in the speaker port having a ring surface facing
the phase plug configured to form a transitional volume without
substantial discontinuities on the ring surface opening into the
speaker horn.
11. The device of claim 1, including a microphone, and a telephone
connected to the microphone and the speaker.
12. The device of claim 1, including a microphone, and a telephone
compatible adaptor connected to the microphone and the speaker.
13. A desktop device, comprising: a housing having a bottom side
configured to face a surface on which the device is placed, a front
side and a speaker port on the bottom side; a down-firing speaker
facing the speaker port on the housing; a microphone port on the
housing; electronics on the housing, including a speaker driver
electronically connected to the speaker, and a microphone; and a
horn assembly on the housing arranged to define a speaker horn in
combination with said surface, a speaker horn having a throat
region proximal to the speaker port and a mouth proximal to the
front side of the housing, wherein the horn assembly comprises
first and second sidewalls on the housing having proximal ends
proximal to the speaker port and distal ends proximal to the mouth,
the first and second sidewalls being separated by a first width W1
proximal to the speaker port, and the distal ends of the first and
second sidewalls being separated by a second width W2, where W2 is
greater than W1 proximal to the mouth, and the first and second
sidewalls having a first height H1 proximal to the speaker port,
and the distal ends of the first and second sidewalls having a
second height H2 proximal to the mouth, where H2 is greater than
H1.
14. The device of claim 13, wherein the speaker comprises a
diaphragm and a phase plug, the phase plug having an aperture or
apertures opening into the speaker port.
15. The device of claim 13, wherein the speaker comprises a
diaphragm and a phase plug, the phase plug having an aperture or
apertures opening into the speaker port; and including a ring
disposed in the speaker port around a perimeter of the phase plug,
the ring having a smooth outside surface defining an inside wall of
the horn assembly at the speaker port.
16. The device of claim 13, wherein the horn assembly is arranged
so that the speaker horn has substantially continuously increasing
volume from the throat region to the mouth.
17. The device of claim 13, wherein the microphone port is located
in a position spaced laterally away from the horn assembly so that
dispersion of acoustic energy in air from the speaker is diverted
from the microphone port by a sidewall of the horn assembly.
18. The device of claim 17, wherein the first sidewall includes a
surface pad configured to contact the surface along a majority of
its length from the throat region to the mouth, and the second
sidewall is configured to sit above the surface along a majority of
its length from the throat region to the mouth.
19. The device of claim 13, the horn assembly including a ring in
the speaker port having a ring surface facing the phase plug
configured to form a transitional volume without substantial
discontinuities on the ring surface opening into the speaker horn
volume.
20. The device of claim 13, wherein the housing includes a first
upwardly facing portion having a user interface and a second
upwardly facing portion having a tray configured to receive a
mobile computing device, and wherein the speaker port is disposed
beneath the first portion and the microphone port is disposed
beneath the second portion.
Description
BACKGROUND
Field
[0001] The present invention relates to desktop equipment that
includes a speaker, such as a desktop speaker phone.
Description of Related Art
[0002] Desktop equipment is often configured with a speaker or
speakers. It is desirable that the area on the desktop taken by
such equipment be as small as possible. One approach to reducing
the area includes down-firing speakers on the underside of the
equipment. In this way, elements of the equipment such as the user
interface, an electronics module and the speaker can be stacked,
reducing the overall footprint of the equipment.
[0003] A down-firing speaker in prior art equipment directs sound
energy towards the desktop surface or other deflecting surface,
causing it to disperse outwardly into the room. This can result in
the sound being dispersed with undesirable patterns and directions.
Accordingly, to account for this type of dispersion, high-power
drivers are required in order to reach desired volume levels for
users of the device.
[0004] It is desirable to provide a technology for improving the
audio characteristics of equipment including down-firing
speakers.
SUMMARY
[0005] A desktop device such as a speaker phone is described herein
that comprises a housing having a bottom side configured to face a
surface on which the device is to be placed, such as a desktop, and
a front side configured to face a user of the device. A down-firing
speaker is placed on the housing, where "on the housing" includes
being inside or otherwise attached to or part of the housing. A
speaker port is disposed on the bottom side of the housing. A horn
assembly on the housing is arranged to define a speaker horn in
combination with the surface on which the device is placed. The
speaker horn formed by this combination has a throat region
proximal to the speaker port and a mouth proximal to the front side
of the housing.
[0006] The horn assembly is arranged in examples described herein
so that the speaker horn has a substantially continuously
increasing volume from the throat region to the mouth. The horn
assembly can comprise first and second sidewalls on the housing
having proximal ends proximal to the speaker port and distal ends
proximal to the mouth of the speaker horn. The first and second
sidewalls in one described example are separated by first width W1
proximal to the speaker port, and separated by a second width W2
proximal to the mouth, where W2 is greater than W1. Also, the first
and second sidewalls have a first height H1 proximal to the speaker
port, and a second height H2 proximal to the mouth, where H2 is
greater than H1.
[0007] In an example described herein, the speaker comprises a
diaphragm and a phase plug. The phase plug has an aperture or
apertures opening into the speaker port. A ring is used in some
embodiments, disposed in the speaker port around a perimeter of the
phase plug, the ring having a smooth outside surface defining an
inside wall of the horn assembly at the speaker port.
[0008] In some types of equipment, a microphone is disposed in the
housing, which includes a microphone port, which can open on the
bottom side of housing. The microphone port can be located in a
position spaced laterally away from the horn assembly so that
dispersion of acoustic energy in air from the speaker is diverted
from this microphone port by a sidewall of the horn assembly.
[0009] Other aspects and advantages of the present invention can be
seen on review of the drawings, the detailed description and the
claims, which follow.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a drawing of a speaker phone having a down-firing
speaker with a horn assembly having a mouth facing a user of the
speakerphone.
[0011] FIG. 2 is a view of the bottom side of the equipment shown
in FIG. 1, illustrating a speaker horn assembly and microphone
port.
[0012] FIG. 3 is a cutout cross-section of the equipment of FIG. 1
showing an arrangement of a down-firing speaker with a horn
assembly.
[0013] FIG. 4 is an illustration showing some relative dimensions
of a horn assembly, like that shown in FIGS. 2 and 3.
DETAILED DESCRIPTION
[0014] A detailed description of embodiments of the present
invention is provided with reference to the FIGS. 1-4.
[0015] FIG. 1 illustrates device 10, which is representative of a
variety of desktop equipment which can be configured as described
herein with a down-firing speaker and horn assembly. The desktop
equipment can include electronic circuitry to apply signals to the
speaker. In the case of device 10, a speakerphone as illustrated,
in which the electronic circuitry supports telephone functions.
Other types of equipment can include electronic circuitry that
supports other functions that use the speaker, including simply
circuits to apply signals from any source to the speaker. In
examples of the device, electronics are disposed on the housing
typically in an electronics module or circuit board, including a
speaker driver electronically connected to the speaker and other
supporting circuits.
[0016] In the illustrated example, the device 10 includes a housing
having a first upwardly facing portion 11 and a second upwardly
facing portion 12. In this example, the first upwardly facing
portion 11 has a user interface with buttons and a display region.
In this example, the second upwardly facing portion 12 includes a
tray configured to receive a mobile computing device. In the
portion 12, the tray can include a cutout portion 13 allowing space
for charging cables or other cords. Also in the example
illustrated, the device 10 includes a cradle 14 configured to hold
a headset.
[0017] The device 10 in this example includes a telephone having a
microphone disposed in a microphone port and a down-firing speaker
disposed in a speaker port that opens into a horn assembly on the
housing of the device. Also, the device can be coupled to a
telephone by a wireless connection, by a cord, or in other ways,
such as in the case of a mobile phone in the tray on portion 12 of
the housing.
[0018] In FIG. 1, a desktop 20 is illustrated having a surface 21
on which the device 10 is placed. Of course, the surface 21 need
not be the surface of the desk, but can be any surface on which the
device can be placed.
[0019] The device 10 has a bottom side that is configured to face
the surface 21. Also, the device has a front side which is
configured to face a user of the device.
[0020] The housing of the device 10 includes a horn assembly on the
bottom side, which in combination with the surface 21 forms a
speaker horn having a mouth 16 as seen in FIG. 1 proximal to the
front side of the device 10. The mouth 16 comprises an opening as
defined by sidewalls of a horn assembly on the bottom side of the
device 10, and the portion 22 of the surface 21 on which the device
10 is placed, and which combines with the horn assembly on the
bottom side of the device to form a speaker horn.
[0021] In this example, the down-firing speaker is disposed beneath
the portion 11 of the device 10 in which the user interface is
disposed. Likewise, the horn assembly extends beneath the first
portion 11 from a speaker port on the bottom side of the equipment
to the mouth 16. In other embodiments, the positions of these
elements are arranged as suits a particular configuration.
[0022] FIG. 2 is a perspective view of the device 10 shown in FIG.
1 rotated 180.degree. in a clockwise direction to reveal the bottom
side of the housing. In this example, the device 10 includes a
bridge-shaped foot 31 coupled to the housing 30, configured to
support the device on a surface 21.
[0023] A speaker port 33 opens into a horn assembly on the bottom
side. The horn assembly includes a first sidewall 35 and a second
sidewall 36, a back wall 55, and a downwardly facing surface 38
which, in combination with the surface on which the device is
placed, provide a speaker horn having a throat region proximal to
the speaker port 33 and a mouth 16 at the front side of the device.
In the illustrated example, the downwardly facing surface 38 of the
horn assembly is corrugated along a portion proximal to the speaker
port and smooth along a portion proximal to the mouth 16 of the
horn assembly. In other embodiments, the downwardly facing surface
can be smooth and flat on a majority of its area or all of its
area. Other surface textures can be used for cosmetic purposes or
other purposes.
[0024] A front portion 39 of the housing adjacent the mouth 16 of
the horn assembly defines a front side of the device.
[0025] First and second surface pads 40, 41 are disposed proximal
to the mouth 16 of the horn assembly on the downwardly facing
surfaces of the first and second sidewalls 35, 36, to support
contact to the surface on which the device is placed. The
downwardly facing surface of the sidewall 36 also includes a
surface pad 45, to support contact with the surface on which the
device is placed. The surface pad 45 can be configured to contact
the surface along a majority of its length from the throat region
to the mouth of the horn assembly.
[0026] Also, the bottom side of the device 10 includes a leg 32, in
this example beneath the portion 12. A microphone port 50 is
disposed on the leg 32, in this example, spaced away from the horn
assembly. The leg has a sidewall 51, that faces an opposing
sidewall 52 on the housing module supporting the speaker and the
horn assembly on the underside of the device 10. The sidewalls 51
and 52, along with the position of the microphone port laterally
spaced away from the horn assembly, are configured so that
dispersion of acoustic energy in air from the speaker is diverted
from the microphone port by a sidewall of the horn assembly,
serving to reduce coupling of sound from the speaker into the
microphone port.
[0027] A surface pad 42 is disposed on the downwardly facing
portion of the leg 32, and can comprise a material that absorbs
sound or conforms to the surface to dampen coupling of audio
signals from the surface and from air into the microphone port
50.
[0028] The surface pad 45 on the downwardly facing surface of
sidewall 36 can comprise a material that can absorb sound or
conform to the surface, and reduce coupling of sound via air in the
direction towards the leg 32.
[0029] Surface pads are not provided on one or both of the
downwardly facing surface 37 of the sidewall 35 and the downwardly
facing surface of the back wall 55, in some embodiments, leaving a
narrow space between the housing of the device 10 and the surface
on which the device is placed, allowing dispersion of some sound
energy in lateral directions away from the microphone port. For
example, the downwardly facing surface 37 of the sidewall 35 can be
configured to sit above the surface along a majority of its length
from the throat region to the mouth.
[0030] A ring 34 is disposed in the speaker port and has a ring
surface configured to form a transitional volume from the speaker
into the throat region of the horn assembly. The speaker can
comprise a diaphragm and a phase plug, in which the phase plug has
an aperture or apertures opening into the speaker port. The ring 34
can be disposed around a perimeter of the phase plug, and have a
smooth outside surface defining an inside wall of the horn assembly
at the speaker port.
[0031] As illustrated in the perspective view of FIG. 2, the
speaker port 33, the back wall 55, the surface 38, and the first
and second sidewalls 35, 36 combine with the surface on which the
device is to be placed to form a speaker horn, which preferably has
a continuously increasing volume from the throat region proximal to
the speaker port 33, to the mouth 16. For the purposes of
description of the volume of a speaker horn formed by the horn
assembly and the surface on which the device is to be placed, the
surface can be represented by a plane defined by the set of points
(e.g. surface pads 40, 41, 42, 45, foot 31) on the housing designed
to contact the surface on which the device is placed.
[0032] In this example, it is seen that the first and second
sidewalls 35, 36 are separated by a distance proximal to the
speaker port that is less than the separation distance proximal to
the mouth 16. Also, the first and second sidewalls have heights
proximal to the speaker port 33 that are less than the heights
proximal to the mouth 16. The ring 34 in the speaker port serves to
smooth the transition from the downward facing speaker into the
horn assembly, and reduces discontinuities that can impact the
audio characteristics including the frequency response of the
speaker and horn assembly.
[0033] FIG. 3 is a cross-section of the housing of the device of
FIGS. 1 and 2 in the region of the down-firing speaker and the horn
assembly. The illustrated structure includes the housing structural
members 70, 71 on which a speaker is disposed including a magnet
63, a voice coil 62, and a diaphragm 61. The speaker has an axis
that is slanted by a few degrees relative to normal of the surface
on which it is to be placed, which orients the speaker to project
sound primarily downwardly, but with a slightly forward facing
vector component into the horn assembly.
[0034] The speaker is coupled by a vibration damping gasket 67 to
the housing structural members 70, 71. In this example, the speaker
includes a phase plug 60 having an aperture or multiple apertures
which open into the speaker port 33. Ring 34 which is comprised of
material having a smooth curved surface is disposed around the
periphery of the phase plug 60, defining an inside wall of the horn
assembly at the speaker port and defining a transitional volume in
the speaker port 33 downwardly into the speaker horn defined by the
horn assembly. In some embodiments, the ring 34 is formed without
substantial discontinuities on the ring surface opening into the
speaker horn volume, where "without substantial discontinuities"
means that the ring surface is tapered or curved so that there are
no acute features on the surface exposed inside the speaker port
and horn assembly.
[0035] In the side cross-section view, sidewall 36 of the horn
assembly is shown, having a surface pad 41 disposed proximal to the
mouth 16 of the horn assembly. The surface 38 of the horn assembly
can be smooth, or have other textures. In the illustrated
embodiment the surface 38 has shallow corrugation over a portion of
the region, and smooth in regions 72 and 73. As mentioned above, in
some embodiments, a surface pad (45 in FIG. 2) is disposed along a
majority of the length of the downwardly facing surface 47 of the
sidewall 36.
[0036] As illustrated, the height of the sidewall 36 proximal to
the throat region of the horn assembly near speaker port 33 is less
than the height of the sidewall 36 proximal to the mouth 16. The
back wall 55 has a side surface inside the horn assembly that is
slanted relative to the surface on which the device is to be
placed. Likewise, the mouth 16 of the speaker horn formed by horn
assembly in combination with the surface is framed by a slanted end
of the sidewall 36 (and sidewall 35 not shown), an edge of the
front portion 39 of the housing, and the surface on which the
device is placed.
[0037] FIG. 4 illustrates some of the dimensions of a horn assembly
in an embodiment like that of FIG. 2. In FIG. 4, the sidewalls 35
and 36, back wall 55, and downward facing surface 38 of the horn
assembly are illustrated schematically, showing a volume of a
speaker horn formed by combination of the horn assembly and the
surface on which the device is to be placed.
[0038] In the illustrated example, the sidewalls 35 and 36 have a
width W1 proximal to the throat region of the horn assembly at the
speaker port 33 in this example, and a width W2 proximal to the
mouth 16 of the horn assembly. To form a speaker horn with a
continuously increasing volume, the width W2 is greater than the
width W1 in this example.
[0039] Also in the illustrated example, the sidewalls 35 and 36
have a height H1 proximal to the throat region of the horn assembly
at the speaker port 33 in this example, at a height H2 proximal to
the mouth 16 of the horn assembly. To form a speaker horn with a
continuously increasing volume, the height H2 is greater than the
height H1.
[0040] In other embodiments the configuration of the horn assembly
can have other dimensions.
[0041] A technology is described suitable for implementation of a
speakerphone or other desktop equipment, with a down-firing speaker
and horn assembly that can provide improved quality audio
performance. By deploying a horn assembly that forms a speaker horn
in combination with the surface on which the device is placed, a
pressure gradient created by the physical geometry can be leveraged
to improve audio performance. This configuration can help focus
sound towards users of the speakerphone, utilizing angled surfaces
to create increasing pressure gradient and project audio. Also, the
speaker horn can be configured to focus sound away from a
microphone on the device, passively minimizing echo that can
improve voice quality.
[0042] While the present invention is disclosed by reference to the
preferred embodiments and examples detailed above, it is to be
understood that these examples are intended in an illustrative
rather than in a limiting sense. It is contemplated that
modifications and combinations will readily occur to those skilled
in the art, which modifications and combinations will be within the
spirit of the invention and the scope of the following claims.
* * * * *