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JP2018514135

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DESCRIPTION JP2018514135
Abstract Dual-diaphragm microphones can be used to reduce or eliminate components of the
output signal due to microphone acceleration. The dual diaphragm microphone includes a first
diaphragm spaced apart from the first electrode, and a first sound detection component
configured to generate a first signal, and a second spaced apart from the second electrode. A
second sound detection component can be included that includes two diaphragms and is
configured to generate a second signal. The first sound detection component and the second
sound detection component are directed in opposite directions, and the dual diaphragm
microphone is configured to generate the combined output signal substantially unaffected by the
acceleration of the microphone. An electronic circuit configured to sum the second output signal
is included.
デュアルダイアフラムマイクロホン
[0001]
The present disclosure relates to a microphone. In particular, the present disclosure is directed to
microphone devices, systems, and methods configured to generate an output signal that is
substantially free of components caused by mechanical vibration or physical acceleration of the
microphone.
[0002]
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1
Some microphones use a deformable diaphragm to convert sound into an electrical signal. The
sound in the form of pressure waves deforms the diaphragm and produces an output signal that
may be proportional to the change in pressure acting on the diaphragm. Mechanical vibration or
physical acceleration of the microphone itself can also deform the diaphragm. Deformations
induced by vibration or acceleration may also produce or affect the output signal of the
microphone. Thus, the microphone may generate a first component indicative of a sound wave
incident on the microphone and a second component resulting from vibration or acceleration of
the microphone. These two components may be difficult to distinguish, and any modification of
the microphone's output signal not caused by sound waves may be undesirable.
[0003]
Many consumer devices include a microphone to measure, record or transmit an audio signal.
Often, such consumer devices may also be portable, and many are handheld. For example, cell
phones often include a microphone to record and transmit the user's voice. The microphones in
these devices often experience vibrations or accelerations that can affect the output signal of the
microphone during use.
[0004]
The present disclosure relates to microphone devices, systems, and methods configured to
provide an output signal that removes or reduces any component of the output signal that may
be caused by physical acceleration or vibration of the microphone itself. The devices, systems,
and methods of the present disclosure each have several innovative aspects, no single one of
which is a single source of the desired attributes disclosed herein.
[0005]
In some aspects, the microphone is a first microphone component configured to generate a first
signal using a first pressure deformable diaphragm having an exterior facing in a first direction;
A second pressure-deformable diaphragm having a first microphone component, the first signal
changing with the deformation of the first pressure-deformable diaphragm, and a second surface
facing outward in a second direction A second microphone component configured to generate a
signal, wherein the second signal changes with the deformation of the second pressure
deformable diaphragm, the second direction substantially with the first direction. A second
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2
microphone component, which is the opposite, and electronic circuitry configured to sum the
first and second signals to generate an output signal may be included. In some aspects, the first
microphone component is rigidly attached to the second microphone. The first pressure
deformable diaphragm may be oriented parallel to the second pressure deformable diaphragm.
The output signal of the microphone may be substantially free of components due to the
acceleration of the microphone.
[0006]
In some aspects, the microphone is spaced apart from the first electrode, the first sound
detection component including the first diaphragm configured to generate the first signal and
spaced apart from the second electrode. A second sound detection component including a second
diaphragm configured to generate a second signal, the first sound detection component and the
second sound detection component in opposite directions A directed second sound detection
component and electronic circuitry configured to sum the first and second output signals to
generate an output signal. In some aspects, the first sound detection component is rigidly
attached to the second sound detection component. The combined output signal may be
substantially unaffected by the acceleration of the microphone. Each of the first and second
sound detection components may be exposed to the environment. In some aspects, the first
diaphragm is oriented parallel to the second diaphragm.
[0007]
In some aspects, a dual diaphragm microphone is disposed within the first volume and a first
pressure deformable diaphragm at least partially surrounding the first volume and spaced apart
from the first pressure deformable diaphragm A second pressure-deformable diaphragm at least
partially surrounding the second sensing electrode and the second volume, the second pressuredeformed diaphragm being oriented substantially parallel to the first pressure-deformable
diaphragm A second sensing electrode disposed in the second volume and spaced from the
second pressure deformable diaphragm, the first and second sensing electrodes being first and
second pressure deformations; And second sensing electrodes respectively disposed on opposite
sides of the potential diaphragm. The microphone may also include a body, the first and second
volumes being at least partially defined by the body. In some aspects, the first and second
volumes are substantially aligned along an axis extending perpendicularly to the first pressure
deformable diaphragm. In some aspects, the first and second pressure deformable diaphragms
and the first and second sensing electrodes are also substantially aligned along an axis extending
perpendicular to the first pressure deformable diaphragm Ru. In some aspects, the first and
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second volumes are substantially aligned along an axis extending perpendicularly to the first
pressure deformable diaphragm.
[0008]
In some aspects, a method comprises: receiving a first signal from a first sound detection
component oriented in a first direction; rigidly attached to the first sound detection component;
Receiving a second signal from a second sound detection component directed in a second
direction substantially opposite to the direction of, and generating the acceleration of the first
and second sound detection components Summing the first and second signals to produce a
combined output substantially free of signal components. The first sound detection component
may include a first pressure deformable diaphragm including an outer surface directed
circumferentially in a first direction, the second sound detection component being substantially
parallel to the first direction. A second pressure deformable diaphragm may be included that
includes an outer surface oriented circumferentially in a second opposite direction. In some
aspects, the first and second pressure deformable diaphragms are configured such that
components of the first and second signals caused by changes in air pressure are substantially
equal in magnitude and polarity. In some aspects, the first and second pressure deformable
diaphragms are configured such that components of the first and second signals caused by the
microphone acceleration are substantially equal in magnitude and opposite in polarity. Be done.
[0009]
In some aspects, the microphone is a first microphone component configured to generate a first
signal, the first pressure deformable diaphragm having an outer surface facing in a first direction.
A first pressure deformable diaphragm, wherein the first signal changes with the deformation of
the first pressure deformable diaphragm, spaced apart from the inside of the first pressure
deformable diaphragm, by the first pressure deformable diaphragm A first microphone
component including a first electrode disposed in an at least partially enclosed first volume, and
a second microphone component configured to generate a second signal A second pressure
deformable diaphragm having an outer surface facing the second direction, the second signal
being associated with the deformation of the second pressure deformable diaphragm A second
pressure deformable diaphragm, wherein the second direction is substantially opposite to the
first direction, and spaced apart from the second pressure deformable diaphragm, at least
partially by the second pressure deformable diaphragm A second microphone component at least
partially surrounding the first microphone component and the second microphone component,
and the second A housing configured to include at least one opening configured to expose the
first pressure deformable diaphragm to the environment, and acoustically isolating the second
pressure deformable diaphragm; And electronic circuitry configured to sum the first and second
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signals to generate an output signal.
[0010]
The details of one or more implementations of the subject matter described in this disclosure are
set forth in the accompanying drawings and the description below.
Other features, aspects, and advantages will become apparent from the description, the drawings,
and the claims.
[0011]
It should be understood that not all objects and advantages are necessarily achieved in
accordance with any particular implementation described herein. For example, aspects of a
particular implementation do not necessarily achieve other objectives or advantages as may be
taught or suggested by other implementations, but one group of advantages or advantages as
taught herein. May be embodied or carried out in a manner that achieves or optimizes.
Furthermore, various aspects and features from different implementations may be
interchangeable.
[0012]
The following is a brief description of each of the drawings. Like reference numerals are used to
indicate similar components or steps of the implementations discussed herein from figure to
figure. It should be noted that the relative dimensions of the following figures may not be drawn
to scale.
[0013]
It is a figure which shows the mounting form of a microphone. FIG. 6 illustrates output signal
generation in a microphone due to deformation of the diaphragm caused by sound waves. FIG. 6
illustrates output signal generation in a microphone due to deformation of the diaphragm caused
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by sound waves. FIG. 6 illustrates output signal generation at the microphone due to deformation
of the diaphragm caused by physical acceleration. FIG. 6 illustrates output signal generation at
the microphone due to deformation of the diaphragm caused by physical acceleration. FIG. 7
illustrates an implementation of a dual diaphragm microphone configured to reduce signal
components caused by physical acceleration of the microphone. FIG. 5 schematically illustrates
an implementation of an exemplary circuit configured to reduce signal components caused by
physical acceleration of the microphone shown in FIG. 4; FIG. 5 schematically illustrates an
implementation of an exemplary circuit configured to reduce signal components caused by
physical acceleration of the microphone shown in FIG. 4; FIG. 5 illustrates output signal
generation in the dual diaphragm microphone shown in FIGS. 4 and 5 due to the deformation of
the diaphragm caused by sound. FIG. 6 illustrates output signal generation in the dual diaphragm
microphone shown in FIGS. 4 and 5 due to deformation of the diaphragm caused by physical
acceleration. FIG. 7 illustrates an alternative implementation of a dual diaphragm microphone
configured to generate an output signal substantially unaffected by physical acceleration of the
microphone. FIG. 7 shows an implementation of a dual diaphragm microphone incorporated into
a handheld device. FIG. 7 shows an implementation of a dual diaphragm microphone disposed in
a housing including two openings. FIG. 7 illustrates an implementation of a dual diaphragm
microphone disposed in a housing that includes a single opening. FIG. 7 illustrates an additional
implementation of a dual diaphragm microphone disposed in a housing including a single
opening. FIG. 5 is a flow chart illustrating a method for generating an output signal that is
substantially free of any component due to physical acceleration. FIG. 7 shows an
implementation of a headset that includes a dual diaphragm microphone.
[0014]
The present disclosure discusses microphone devices, systems, and methods configured to
reduce or eliminate components of the output signal that may be caused by physical acceleration
or vibration of the microphone itself. In general, some implementations of microphones use
membranes to detect changes in air pressure caused by acoustic pressure waves, converting
membrane displacements into electrical signals indicative of acoustic waves. However,
displacement of the microphone membrane may also be induced by movement or vibration of
the microphone, and this displacement of the microphone membrane will also produce or change
the output signal of the microphone. The signal components induced by such acceleration may
be difficult to distinguish from the signal generated by the incident sound wave. In some
implementations, a dual diaphragm microphone may be configured that produces a combined
output signal that is substantially unaffected by microphone acceleration or other movement.
[0015]
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FIG. 1 shows an implementation of the microphone 100. In some implementations, the
microphone 100 is any acousto-electrical transducer or sensor that converts sound into an
electrical signal. In some implementations, the microphone may be a dynamic microphone, a
condenser microphone, an electric condenser microphone, an analog / digital MEMS microphone,
or other sound detection device.
[0016]
Microphone 100 includes a body 101, a diaphragm 102, and a sensing electrode 104. The
diaphragm 102 may be connected to the body 101 to define an at least partially enclosed volume
106. In some implementations, volume 106 is filled with compressible air. The sensing electrode
104 is mounted within the volume 106 and spaced apart from the diaphragm 102. In some
implementations, the sensing electrode 104 is rigidly mounted or otherwise secured within the
volume 106 to create a fixed spatial relationship between the body 101 and the sensing
electrode 104. Ru.
[0017]
The diaphragm 102 may be a pressure deformable membrane. In some implementations, the
outer side 102a of the diaphragm 102 is exposed to the environment either directly as shown, or
through an opening in the body or housing surrounding the microphone 100. Sound waves from
the outside of the microphone 100 reach the outside 102 a of the diaphragm 102 and collide
with it. The inner side 102 b of the diaphragm 102 is directed towards the volume 106 and is
spaced apart from the sensing electrode 104. In some implementations, the sense electrode 104
may be connected to the output terminal 105, and the output signal of the microphone 100 can
be measured at the output terminal 105. The output terminal 105 may, in some
implementations, be in electrical communication with other circuits, such as an amplifier or filter,
for further processing of the output signal. In some implementations, the diaphragm 102 may be
connected to a ground terminal 103 that is used to ground the microphone circuit. In some
implementations, the connection to ground terminal 103 and output terminal 105 may be
reversed. For example, sense electrode 104 can be connected to ground terminal 103 and
diaphragm 102 can be connected to output terminal 105. As discussed more fully below, the
microphone 100 generates an output signal in response to deformation, displacement, or
movement of the diaphragm 102 relative to the sensing electrode 104.
03-05-2019
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[0018]
In some implementations, the output signal of the microphone 100 can be a voltage. For
example, in some implementations, the microphone 100 can be configured as a condenser
microphone having a membrane or diaphragm 102 that functions as a plate of a capacitor and a
sensing electrode 104. As the diaphragm 102 deforms in response to incident sound waves, the
distance between the diaphragm 102 and the sensing electrode 104 changes. A change in the
distance between the diaphragm 102 and the sensing electrode 104 causes a change in
capacitance and a resulting change in voltage across the capacitor formed by the diaphragm 102
and the sensing electrode 104. The voltage that changes with time may be the output signal of
the microphone 100.
[0019]
In another implementation, the microphone can be configured as a dynamic microphone
attached to the diaphragm and having an inductive coil disposed within the magnetic field of the
permanent magnet. As the diaphragm deforms, the movement of the induction coil through the
magnetic field produces a current that changes due to electromagnetic induction. The changing
current can, for example, generate a voltage change across the attached resistor. In some
implementations, this changing voltage or changing current can be the output signal of the
microphone. The term output signal is used throughout the present application to indicate any
electrical signal (voltage, current, capacitance or otherwise) generated by the microphone in
response to the deformation of the diaphragm.
[0020]
In some implementations, the microphone 100 can include additional components or features
not specifically shown in FIG. For example, the microphone 100 can include additional electronic
circuitry for processing and / or transmitting the output signal of the microphone 100. In some
implementations, the microphone 100 can include additional structural components such as a
guard configured to protect the outside 102a of the diaphragm 102 without preventing sound
from reaching the diaphragm 102. . In some implementations, the microphone 100 may be
incorporated into or connected to another electronic device, such as a cellular phone, a tablet, or
other electronic device.
03-05-2019
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[0021]
In FIG. 1, the microphone 100 is shown with the diaphragm 102 in an undeformed or stationary
position. This position may represent a situation where the ambient air pressure acting on the
outer surface 102a of the diaphragm 102 is substantially equal to the air pressure in the volume
106 acting on the inner surface 102b of the diaphragm. This position represents the baseline
position of the diaphragm 102, where the output signal produced by the microphone 100 is at a
baseline condition which may be substantially zero in some implementations. Good.
[0022]
FIGS. 2A and 2B illustrate the generation of an output signal by the microphone 100 due to the
deformation of the diaphragm 102 caused by the change in air pressure associated with the
acoustic wave 150. Specifically, FIG. 2A shows the inward deformation of the diaphragm 102 and
FIG. 2B shows the outward deformation of the diaphragm 102.
[0023]
As shown in FIGS. 2A and 2B, the acoustic wave 150 acting on the outer surface 102a of the
diaphragm 102 deforms the diaphragm 102 of the microphone 100 so as to reduce or increase
the distance between the electrode 104 and the diaphragm 102. There is. For example, as shown
in FIG. 2A, inward deformation (towards the sensing electrode 104) may occur when the sound
wave 150 strikes the diaphragm 102 due to the pressure differential induced by the sound wave
150. Similarly, as shown in FIG. 2B, the outward deformation (towards the sensing electrode 104)
acts upon the higher pressure in the volume 106 and on the outer side 102a of the diaphragm
102 as it rebounds from the position shown in FIG. This can occur due to pressure differences
between lower pressures.
[0024]
The output signal produced by the microphone 100 at the output terminal 105 represents the
change in signal from the baseline position of the diaphragm 102 (at rest position) shown in FIG.
1 and described above. For the purpose of establishing the convention used throughout this
03-05-2019
9
application, the outward deformation of the diaphragm 102 may produce a positive output signal
and the inward deformation of the diaphragm 102 produces a negative output signal. May be
However, one skilled in the art will understand that this convention may be reversed without
departing from the scope of the present disclosure.
[0025]
In some implementations, the diaphragm 102 is configured such that the deformation of the
diaphragm 102 is substantially proportional to the pressure differential across the range of
pressures that the microphone 100 is expected to be exposed to. Thus, the magnitude of the
output signal of the microphone 100 may also be proportional to the pressure of the sound wave
150 being measured.
[0026]
Those skilled in the art will appreciate that the microphone 100 need not be directional. For
example, in some implementations, the microphone 100 may be substantially omnidirectional,
and sound waves 150 emitted from any direction may cause the diaphragm 102 to deform. Thus,
the sound wave 150 shown in FIGS. 2A and 2B is provided merely as an example, and no
illustrated directivity of the sound wave 150 is required.
[0027]
FIGS. 3A and 3B illustrate a deformation of the diaphragm 102 caused by physical acceleration
of the microphone 100, which may also generate or affect the output signal of the microphone
100. FIG. Specifically, FIG. 3A shows the outward deformation of the diaphragm 102 of the
microphone 100, and FIG. 3B shows the inward deformation of the diaphragm 102 of the
microphone 100. In these figures, the upward and downward directions are defined with respect
to an axis extending perpendicularly to the surface of the undeformed diaphragm 102 (see FIG.
1), and the downward direction is perpendicular to the plane of the undeformed diaphragm 102
It extends to indicate the direction towards the sensing electrode 104. Similarly, upward refers to
the opposite direction of extending perpendicularly to the plane of the undeformed diaphragm
102 and away from the sensing electrode 104. Thus, in FIGS. 3A and 3B, the term upward refers
to the direction towards the top of the figure, and the term downward refers to the direction
towards the bottom of the figure.
03-05-2019
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[0028]
The body 101 of the microphone 100 may generally be made of a rigid material so as not to
deform substantially under acceleration. As discussed above, sensing electrodes 104 may be
disposed within volume 106 and rigidly attached to body 101. The sensing electrode 104 may
also be sufficiently rigid so that the microphone does not substantially deform when vibrated,
dropped, moved or otherwise accelerated. Thus, when the microphone 100 is subjected to
acceleration, the spatial relationship between the body 101 and the sensing electrode 104
remains constant. Because the diaphragm 102 is not rigid, the spatial relationship between the
diaphragm 102 and the sensing electrode 104 changes when the microphone is affected by
acceleration.
[0029]
As shown in FIG. 3A, when the microphone 100 accelerates downward, the diaphragm 102 does
not move downward at the same speed as the rest of the microphone 100, resulting in an initial
outward deformation of the diaphragm 102. The outward deformation increases the distance
between the diaphragm 102 and the sensing electrode 104 and produces a positive output
signal. As shown in FIG. 3B, when the microphone 100 accelerates upward, the diaphragm 102
does not move upward at the same speed as the rest of the microphone 100, causing an initial
inward deformation of the diaphragm 102. The inward deformation reduces the distance
between the diaphragm 102 and the sensing electrode 104 and produces a negative output
signal.
[0030]
Thus, implementations of the microphone 100 may generate an output signal having
components resulting from sound induced deformation and components resulting from
acceleration induced deformation. Sometimes, the relative spacing between the diaphragm 102
and the sensing electrode 104 will be influenced by the movement of the diaphragm 102
induced by both the incident sound and the acceleration each contributing to the output signal.
As such, during acceleration, or while diaphragm 102 is still vibrating due to recent acceleration,
it may be exposed to acoustic waves. In some implementations, it can be difficult to distinguish
between components of the output signal resulting from acceleration and components of the
03-05-2019
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output signal resulting from exposure of the microphone 100 to incident sound waves.
[0031]
The purely lateral acceleration of the microphone 100, ie, the acceleration in the plane of the
undeformed diaphragm 102, may not cause substantial deformation of the diaphragm 102. Thus,
purely lateral acceleration of the microphone 100 may not affect the output signal. However, any
acceleration of the microphone 100 with any upward or downward components will produce an
effect on the output signal that may not be distinguishable from the effect of the incident sound
wave on the output signal.
[0032]
Those skilled in the art will appreciate that the output signal of the microphone 100 is a signal
component caused by sound (as described in connection with FIGS. 2A and 2B), and the
microphone (as described in connection with FIGS. It will be appreciated that it may include 100
signal components caused by acceleration. However, for most applications, it may be
advantageous to separate the components of the output signal resulting from the input sound
wave. For example, components induced by acceleration of the output signal may be problematic
in various microphone applications, including, for example, voice capture, active noise
cancellation, or transmit uplink processing. Therefore, a microphone design that can reduce or
eliminate components of the output signal due to acceleration is desirable.
[0033]
FIG. 4 shows an implementation of dual diaphragm microphone 200 configured to reduce output
signal components caused by physical acceleration of microphone 200. The microphone 200
comprises two sound detection components 200a, 200b directed in opposite directions. In some
implementations, each sound detection component 200a, 200b may include the components of
the microphone 100 described above with reference to FIGS. 1 to 3B. In some implementations,
the sound detection component 200a, 200b can be any acoustic-electrical transducer or sensor
that converts sound to an electrical signal based on the movement of a subcomponent such as a
deformable membrane It is. For example, in some implementations, each sound detection
component may be a dynamic microphone, a condenser microphone, an electric condenser
microphone, an analog / digital MEMS microphone, or other suitable sound detection device.
03-05-2019
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[0034]
In general, the implementation of the microphone 200 includes a first sound detection
component 200a oriented in a first direction. In some implementations, the first sound detection
component 200 a includes a first body 201, a first diaphragm 202, and a first sensing electrode
204. The first diaphragm 202 is supported by the first body 201 to define an at least partially
enclosed first volume 206. In some implementations, the first volume 206 is filled with a volume
of compressible air. A first sensing electrode 204 is mounted in the first volume 206 and spaced
apart from the first diaphragm 202. In some implementations, the first sensing electrode 204 is
in the first volume 206 to create a fixed spatial relationship between the first body 201 and the
first sensing electrode 204. It is firmly installed.
[0035]
The first diaphragm 202 may be a compressively deformable membrane. In some
implementations, the outer side 202a of the first diaphragm 202 is exposed to the environment,
allowing sound waves to collide with the first diaphragm 202 and deform it. The inner side 202 b
of the first diaphragm 202 is directed towards the volume 206 and spaced apart from the first
sensing electrode 204. In some implementations, the first diaphragm 202 is connected to a first
ground terminal 203 for grounding the first diaphragm 202. The first sensing electrode 202 may
be connected to the first output terminal 205, and the output signal of the first sound detection
component 200a can be measured at the first output terminal 205. The first output terminal 205
can be electrically connected to the electronic circuit 220 to form the coupled output terminal
225.
[0036]
The implementation of the microphone 200 also includes a second sound detection component
200b oriented in a second direction substantially opposite to the first direction. The second
sound detection component 200b may be rigidly attached to the first sound detection component
200a. In some implementations, the second sound detection component 200 b includes a second
body 211, a second diaphragm 212, and a second sensing electrode 214. In some
implementations, the second body 211 is integral with the first body 201. For example, in some
implementations, the first and second bodies 201, 211 are formed as a single structure or
03-05-2019
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assembly. In some implementations, the first and second bodies 201, 211 may be separate pieces
that are directly or indirectly attached or fixed to one another. The second diaphragm 212 is
connected to the second body 211 so as to define a second volume 216 which is at least partially
taken up. In some implementations, the second volume 216 is filled with a volume of
compressible air. A second sensing electrode 214 is mounted within the second volume 216 and
spaced apart from the second diaphragm 212. In some implementations, the second sensing
electrode 214 is in the second volume 216 to create a fixed spatial relationship between the
second body 211 and the second sensing electrode 214. It is firmly installed.
[0037]
The second diaphragm 212 may be a compressible membrane. In some implementations, the
outer side 212a of the second diaphragm 212 is exposed to the environment, allowing sound
waves to strike the second diaphragm 212 and deform it. The inner side 212 b of the second
diaphragm 212 is directed towards the second volume 216 and spaced apart from the second
sensing electrode 214. In some implementations, the second diaphragm 212 is connected to a
second ground terminal 213 for grounding the second diaphragm 212. In some implementations,
the second sensing electrode 214 is connected to the second output terminal 215, and the output
signal of the second sound detection component 200b is measured at the second output terminal
215 It is possible. The second output terminal 215 can also be electrically connected to the
electronic circuit 220 to form the coupled output terminal 225. Thus, the combined output
terminal 225 can be used to measure the combined output signal of the microphone 200, ie the
summed output signal of the first and second sound detection components 200a, 200b.
[0038]
As mentioned above, the first and second sound detection components 200a, 200b can be rigidly
attached or fixed relative to one another in order to maintain their respective orientations
relative to one another is there. In some implementations, the first and second sound detection
components 200a, 200b are formed in a single integral housing defining the first and second
volumes 206, 216. In some implementations, the first and second sound detection components
200a, 200b are formed as separate bodies (e.g., the bodies 201, 211 described above) rigidly
attached to one another. Thus, when the microphone 200 is subjected to acceleration, the first
and second sound detection components 200a, 200b accelerate together.
[0039]
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14
Furthermore, the first and second sound detection components 200a, 200b are directed in
opposite directions. Thus, in some implementations, the inner surfaces 202b, 212b of the first
and second diaphragms 202, 212, respectively, may be oriented to substantially face each other.
In some implementations, the outer surfaces 202a, 212a of the first and second second 202,
212, respectively, may be oriented to face substantially away from one another. In some
implementations, the first and second sensing electrodes 204, 214 are each bounded on one side
by a plane that includes the first diaphragm 202 and the other by a plane that includes the
second diaphragm 212. Included in the space bounded at the side. In some implementations, for
example, the first sensing electrode 204 is disposed below the first diaphragm 202 and the
second sensing electrode 214 is disposed above the second diaphragm 212, or vice versa. The
first sensing electrode 204 is disposed on the first side of the first diaphragm 202 along an axis
perpendicular to the first diaphragm 202, and the second sensing electrode 214 is , Disposed on
the second side of the second diaphragm 212 along an axis perpendicular to the second
diaphragm. In some implementations, the first and second diaphragms 202, 212 are arranged in
a parallel orientation.
[0040]
As shown in FIG. 4, in some implementations of the microphone 200, a first diaphragm 202, a
first sensing electrode 204, a first volume 206, a second diaphragm 212, a second sensing
electrode 214, and The second volume 216 may be aligned along a single axis, the axis
substantially orthogonal to the rest position of the first and second diaphragms 202, 212. In
some implementations, the first and second sound detection components 200a, 200b may be
arranged in a specular configuration that is reflected across an axis extending perpendicular to
either diaphragm 202, 212 . In some implementations, the first and second sound detection
components 200a, 200b are stacked. However, in some implementations, only some of these
elements are aligned, and in some implementations, none of these elements need to be aligned.
[0041]
In general, the output signal of the microphone 200 is the combined output signal of each of the
first and second sound detection components 200a, 200b. In some implementations, the output
signals of the first and second sound detection components 200a, 200b are combined using
electronic circuitry 220. In some implementations, the electronic circuit 220 is a passive
summing circuit. For example, in some implementations, the first output terminal 205 of the first
03-05-2019
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sound detection component 200a can be connected directly to the second output terminal 215 of
the second sound detection component 200b is there. The coupled first and second output
terminals 205, 215 are thereby summed together to form a coupled output terminal 225, and at
the coupled output terminal 225, the coupled output signal of the microphone 200 is measured
It can be electrically connected to other devices or circuits for further processing. In some
implementations, the electronic circuit 220 may include an active component configured to sum
the output signals of the first and second sound detection components 200a, 200b. For example,
in some implementations, the electronic circuit 220 may include a summing amplifier circuit that
includes an operational amplifier.
[0042]
5A and 5B schematically illustrate an exemplary circuit implementation configured to reduce
signal components caused by physical acceleration of the microphone 200 shown in FIG. The
circuit implementation shown in FIG. 5A shows an example of a passive circuit that can be used
with the microphone 200. As shown, the circuit includes first and second sound detection
components 200a, 200b with the diaphragms directed in opposite directions as shown in FIG. As
shown, the first and second output terminals 205, 215 of the first and second sound detection
components 200a, 200b, respectively, are directly connected to one another to create the
combined output terminal 205 of the microphone 200. . A voltage source 280 is also connected
to the coupled output terminal 225 via a resistor R1 and configured to provide a drive voltage
for each of the first and second sound detection components 200a, 200b.
[0043]
The first and second sound detection components 200a, 200b also include first and second
ground terminals 203, 213, respectively. As shown in the implementation of FIG. 5A, the first and
second ground terminals 203, 213 are each connected to ground through a resistor R2. In some
implementations, the resistances of the resistors R1 and R2 may be adjusted according to
principles known in the art to provide a clean output signal of the microphone 200 at the
coupled output terminal 205. In some implementations, the resistors R2 may each be selected to
compensate for manufacturing variations between the first sound detection component 200a and
the second sound detection component 200b. Thus, the resistance of each resistor R2 may be
different. In some implementations, one or both of the resistors R1 and R2 may include variable
resistors. In some implementations, resistors R1 and R2 may be omitted.
03-05-2019
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[0044]
FIG. 5B shows an example of an active circuit that may be used with the microphone 200. As
shown, the first and second output terminals 205, 215 are each independent of the active
summing circuit 220, as known in the art, to create the combined output terminal 225 and the
combined output signal. May be connected. As shown, the first and second output terminals 205,
215 may also each be independently connected to the voltage sources 280a, 280b via a resistor
R1. The first and second ground terminals 203, 213 may each be connected to ground. In some
implementations, as shown in FIG. 5A and described above, a resistor R2 (not shown in FIG. 5B)
may be included between each sound detection component 200a, 200b and ground. . The
principles presented in the schematics of FIGS. 5A and 5B may be modified according to
principles known in the art. In some implementations, the difference between the signal from
output terminal 205 and the signal from output terminal 215 may be due to acceleration of these
signals while reducing or eliminating the sound induced components of these signals. It may be
obtained by subtracting one of the signals from output terminals 205 and 215 from the other to
obtain a signal indicative of the induced component.
[0045]
6A and 6B show output signal generation in the implementation of dual diaphragm microphone
200 shown in FIGS. 4 and 5 due to the displacement of diaphragms 202, 212 caused by sound
wave 250 and physical acceleration, respectively. As shown and described below, the
microphone 200 is configured to generate a combined output signal indicative of the measured
sound wave while removing or reducing any component of the output signal caused by the
acceleration of the microphone 200. Ru.
[0046]
FIG. 6A shows the output signal generation in dual diaphragm microphone 200 due to the
deformation of first and second diaphragms 202, 212 caused by sound wave 250. FIG. In some
implementations, the first and second sound detection components 200a, 200b need not be
directional. That is, in some implementations, the first and second sound detection components
200a, 200b are configured to measure sound waves 250 coming from any direction. Thus, any
direction of sound wave 250 shown in FIG. 6A is provided for example purposes only and is not
intended to be limiting.
03-05-2019
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[0047]
In some implementations, the dual diaphragm microphone 200 has an overall height h measured
between the first diaphragm 202 and the second second diaphragm 212, which acts on each
diaphragm 202, 212 Small enough so that the effects of the sound waves are substantially the
same. That is, in some implementations, the microphone 200 has a total height h such that
changes in pressure act on the first and second diaphragms 202, 212 substantially equally in
time and magnitude. Configured For example, in some implementations, the microphone 200 has
a total height h less than 5 mm, less than 4 mm, less than 3 mm, less than 2 mm, or less than 1
mm. Those skilled in the art will appreciate that the sound wave 250 causes substantially equal
deformation of the first and second diaphragms 202, 212 for a small height h. This is especially
true for low frequency sounds, for example sounds having a wavelength much smaller than 2
mm. In some implementations, the microphone 200 may exhibit small directional gain
differences due to beamforming effects on high frequency sounds, but the pattern is substantially
unidirectional for sounds having frequencies below 20 kHz. It should be noted that For example,
for a microphone 200 having a height h of about 2 mm, the phase difference between the two
sound detection components 200a and 200b can be as large as 8.5 degrees for a 4 kHz sound
wave. The gain drop of microphone 200 with a 8.5 degree phase difference is calculated to be
about 0.024 dB, which is very small. For a 20 kHz sound, the phase difference may be as large as
42.4 degrees, causing a gain drop of about 0.61 dB, which is also very small.
[0048]
As shown in FIG. 6A, the sound waves 250 cause a pressure difference between the sound waves
250 acting on the outer surface 202a, 212a of each diaphragm 202, 212 and the internal
pressure of the volumes 206, 216 so that Each may be deformed inwardly towards their
respective sensing electrodes 204, 214. The inward deformation reduces the distance between
each diaphragm 202, 212 and its respective sensing electrode 204, 214, causing each sound
detecting component 200a, 200b to generate a negative output signal. The output signal of the
first sound detection component 200a is sent to the electronic circuit 220 via the first output
terminal 205 so as to be added to the output signal of the second sound detection component
200b. Thus, the combined output signal of the microphone 200 caused by the sound wave 250 is
substantially equal to twice the output signal generated by any sound detection component
(assuming there are no components induced by acceleration) . Although not specifically shown in
FIG. 6A, the synchronized outward deformation of each diaphragm 202, 212 results in a similar
combined output signal with opposite polarity.
03-05-2019
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[0049]
FIG. 6B shows the implementation of the dual diaphragm microphone 200 shown in FIGS. 4 to
6A undergoing acceleration, and how the implementation of the microphone 200 reduces the
component of the output signal caused by the acceleration of the microphone 200. Or indicate if
it can be configured to be removed. In FIG. 6B, the microphone 200 is shown undergoing
downward acceleration. However, it will be appreciated that the principles described herein are
applicable to any acceleration of the microphone 200 with any upward or downward component.
[0050]
The body of the microphone 200 comprises a generally rigid material so as to not substantially
deform when accelerated. As discussed above, the first and second sensing electrodes 204 and
214 may be disposed within the first and second volumes 206 and 216, respectively, and rigidly
attached to the body of the microphone 200. The sense electrodes 204 and 214 are also
generally sufficiently rigid to deform when accelerated. Thus, as the microphone 200 accelerates,
the spatial relationship between the bodies 201 and 211 and the sensing electrodes 204 and
214 remains constant. However, the first and second diaphragms 202, 212 are deformable
membranes that may deform when accelerated.
[0051]
For example, as shown in FIG. 6B, when the first sound detection component 200a of the
microphone 200 accelerates downward, the first diaphragm 202 does not move downward at the
same speed as the rest of the microphone 200. , Resulting in an initial outward deformation of
the diaphragm 202. The outward deformation increases the distance between the first
diaphragm 202 and the first sensing electrode 204 to produce a positive first output signal from
the first sound detection component 200a.
[0052]
The second sound detection component 200b is rigidly attached to the first sound detection
03-05-2019
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component 200a and thus undergoes equal acceleration. However, because the second sound
detection component 200b is directed in the opposite direction to the first sound detection
component 200a, the acceleration produces an opposite output signal. For example, when the
second sound detection component 200 b of the microphone 200 accelerates downward, the
second diaphragm 212 does not move downward at the same speed as the rest of the
microphone 200 and moves inward to the initial position of the diaphragm 212. Results in a
deformation of. The inward deformation reduces the distance between the second diaphragm
212 and the second sensing electrode 214 and produces a negative second output signal from
the second sound detection component 200b.
[0053]
In some implementations, when the first and second diaphragms 202, 212 are under the
influence of acceleration, they are substantially in the opposite direction to their respective
sensing electrodes 204, 214. It can be formed from the same deformable material and can have
substantially similar dimensions to experience the same deformation. Thus, in the absence of
incident sound waves, the output signals resulting from the acceleration of the first and second
sound detection components 200a, 200b are substantially equal in magnitude and opposite in
polarity. Summation of these signals using electronics 220 combines the combined output signal
substantially free of components caused by acceleration such that the combined signal is
substantially equal to zero in some implementations. It is generated at the output terminal 225.
[0054]
As mentioned above, implementations of the microphone 200 may not be sensitive to purely
lateral acceleration. Nevertheless, these principles are applicable to any acceleration with upward
or downward components.
[0055]
It is understood that the principles discussed above with reference to FIGS. 6A and 6B can be
applied simultaneously to an implementation of microphone 200 that experiences both physical
acceleration and pressure change due to sound waves 250. Will. As discussed with reference to
FIG. 6A, the sound waves cause each sound detection component 200a, 200b to generate an
output signal that is substantially equal in magnitude and polarity. The component of the output
03-05-2019
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signal caused by the sound is denoted herein as S. As discussed with reference to FIG. 6B,
acceleration of the microphone 200 causes each sound detection component 200a, 200b to
generate a signal that is substantially equal in magnitude but opposite in polarity. The
acceleration induced signal component generated by the first sound detection component 200a
is denoted herein as A and the acceleration induced signal generated by the second sound
detection component 200b is It is written as B in the present specification.
[0056]
Thus, when the microphone 200 is exposed to both the sound wave 250 and the acceleration,
the output signal Output 200 a generated by the first sound detection component 200 a is a
component induced by sound, such as: Output 200 a = S + A (1) It is a combination of S and
component A induced by acceleration.
[0057]
Similarly, the output signal Ouput 200 b of the second sound detection component 200 b is a
combination of a component S induced by sound and a component B induced by acceleration as:
Output 200 b = S + B (2)
As mentioned above, since the first and second sound detection components 200a, 200b are
rigidly mounted and directed in the opposite direction, the output signal induced by each
acceleration is: B = -A ( As in 3), they are equal in size and opposite in polarity. When the output
signals of the first and second sound detection components 200a, 200b are summed by the
electronic circuit 220, the combined output Output 200 of the microphone 200 is: Output 200 =
Output 200a + Output 200b = S + A + S + B = S + A + S + (− A) = 2S (4) Given by Due to the
opposite orientation of the two sound detection components 200a, 200b, the output signal
Output 200 of the microphone 200 comprises only the sound-induced component S of the
output signals Output 200a and Output 200b, and the acceleration-induced component A or B
Neither contains substantially, but instead is equal to twice the sound component.
[0058]
FIG. 7 shows an implementation of dual diaphragm microphone 700 configured to produce an
output signal that is substantially free of any components caused by physical acceleration of
microphone 700. The microphone 700 shown in FIG. 7 is similar to the microphone 200
03-05-2019
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described with reference to FIGS. 4 to 6B. For example, the microphone 700 includes two sound
detection components 700a, 700b directed in opposite directions. Generally, an implementation
of the first sound detection component 700a is a first diaphragm 702 attached to a first body
701, the first diaphragm 702 and the first body 701 at least partially A first diaphragm 702
defining an enclosed first volume 706 and a first sensing electrode 704 disposed within the first
volume 706 and spaced from the first diaphragm 702 are included. Similarly, an implementation
of the second sound detection component 700 b is a second diaphragm 712 attached to a second
body 711, wherein the second diaphragm 712 and the second body 711 are at least partially
And a second sensing electrode 714 disposed within the second volume 716 and spaced apart
from the second diaphragm 712. Each of these individual components may be substantially
similar to the corresponding components described above.
[0059]
In the implementation shown in FIG. 7, the oppositely directed first and second sound detection
components 700a, 700b are laterally aligned. That is, the first and second volumes 706, 716
may be substantially aligned along an axis perpendicular to an axis extending orthogonal to any
of the diaphragms 702, 712. In some implementations, the first sound detection component
700a is from the second sound detection component 700b by a lateral distance d measured
between axes extending perpendicularly to the center of each diaphragm 702, 712. Horizontally
offset. In some implementations, the lateral distance d is small enough so that the air pressure
acting on each diaphragm 702, 712 and the change in vibration or acceleration induced by the
housing is about the same. That is, in some implementations, the microphone 700 has a first
sound detection configuration such that changes in pressure act on the first and second
diaphragms 702, 712 substantially equally in time and magnitude. It is configured with an offset
lateral distance d between the element 700a and the second sound detection component 700b.
For example, in some implementations, the microphone 700 has a lateral offset distance d less
than 5 mm, less than 4 mm, less than 3 mm, less than 2 mm, or less than 1 mm. In some
implementations, the distance d is approximately equal to the diameter of the diaphragms 702,
712 of the sound detection component 700a, 700b. Many analog or digital sound detection
components used in electronic devices have diameters ranging between about 3 mm and 10 mm,
with a diameter of 4 mm being particularly common. Those skilled in the art will understand that
for small distances d, the sound waves cause substantially equal deformation of the first and
second diaphragms 702, 712. This is especially true for low frequency sounds having a
wavelength of less than 2 mm, such as sound. In some implementations, the microphone 700
may exhibit small directional gain differences due to beamforming effects on high frequency
sound, but as described above, the pattern is substantially for sound having a frequency less than
20 kHz. Is unidirectional.
03-05-2019
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[0060]
In some implementations of the microphone 700, including the lateral offset distance d, the first
and second diaphragms 702, 712 are substantially aligned along an axis extending perpendicular
to either diaphragm 702, 712 It may be done. In some implementations, the first and second
sensing electrodes 704, 714 may be substantially aligned along an axis perpendicular to an axis
extending perpendicular to any of the diaphragms 702, 712. Good.
[0061]
As mentioned above, the first and second output terminals 705, 715 of the first and second
sound detection components 700a, 700b are electrically connected to the electronic circuit 720
and summed using the electronic circuit 720. Ru. Thus, the implementation of microphone 700
shown in FIG. 7 produces a combined output signal at output terminal 705 that is substantially
free of any component due to acceleration, according to the principles discussed above with
reference to FIGS. 6A and 6B. Configured to
[0062]
FIG. 8 shows an implementation of dual diaphragm microphone 800 incorporated into handheld
device 870. Dual diaphragm microphone 800 may be configured similarly to microphone 200 or
microphone 700 described above. Implementations of dual diaphragm microphone 800
configured in accordance with the principles disclosed herein may be advantageously
incorporated into any device that measures sound and is likely to move during use. In some
implementations, the microphone 800 can be incorporated into the handheld device 870 as
shown. In some implementations, the handheld device 870 can be a wireless communication
device, such as a laptop computer, a cellular phone, a smart phone, an electronic reader, a tablet
device, a gaming system, and the like. Such devices are generally hand-held in use and may
therefore experience acceleration.
[0063]
In some implementations, the microphone 800 is disposed within the housing 871 of the
03-05-2019
23
handheld device 870. Because the housing 871 may limit the ability of sound waves to reach the
diaphragm of the microphone 800, the housing 871 is configured to allow sound waves to reach
the diaphragm of the microphone 800 and deform it. , One or more openings 873 formed as
holes extending through the housing 871. The position, number, and size of the openings 873
may vary depending on the particular application. In some embodiments, each opening 873
described in the present application is a single hole, a plurality of holes, or an acoustic mesh. 911 show various arrangements of dual diaphragm microphones in a housing configured with an
opening.
[0064]
FIG. 9 shows an implementation of a dual diaphragm microphone 900 disposed in a housing 971
having two openings 973a and 973b. As shown, the microphone 900 includes a first sound
detection component 900a and a second sound detection component 900b oriented in opposite
directions. The microphone 900 is disposed in a housing 971 having two openings 973a and
973b. Each of the openings 973a and 973b may extend through the housing 971 and include
holes, a plurality of holes, or an acoustic mesh configured to allow sound waves to enter the
housing 971. In the implementation of FIG. 9, the first opening 973 a is disposed on the first side
of the housing 971 and is configured to allow sound waves to reach the first diaphragm 902 of
the microphone 900. The second opening 973 b is disposed on the second side of the housing
971 substantially opposite the first opening 973 a. The second opening 973 b is configured to
allow sound waves to reach the second diaphragm 912 of the microphone 900.
[0065]
FIG. 10 shows an implementation of dual diaphragm microphone 1000 disposed within single
aperture housing 1071. The openings 1073 may be configured as holes extending through the
sides of the housing 1071, a plurality of holes, or an acoustic mesh. In some implementations,
the openings 1073 are in a plane perpendicular to the plane of each of the first and second
membranes 1002, 1012 of the microphone 1000. In some implementations, the openings 1073
are disposed on the housing 1071 such that the distances between the openings 1073 and each
of the first and second membranes 1002, 1012 are substantially equal. In some implementations,
a single-opening housing 1071, such as the one shown in FIG. 10, is used in a multi-opening
housing, or on more than one side, with required space or other internal components of the
device. It may be used if it interferes with the use of the housing it has. In other implementations,
the single opening housing 1071 may be used if the directivity of the incident sound is
important. For example, in implementations where the microphone 1000 is incorporated into a
03-05-2019
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handheld device such as a cellular telephone, a single opening 1073 positioned towards the
user's mouth may be desirable.
[0066]
FIG. 11 shows another implementation of a dual diaphragm microphone 1100 disposed within a
single aperture housing 1171. In some implementations, the microphone 1100 may be disposed
within a housing 1171 that includes a single opening 1173. The single opening 1173 is
configured as a hole, a plurality of holes, or an acoustic mesh extending through the housing
1171 so that sound waves can reach one diaphragm of the microphone 1100, eg, the first
diaphragm 1102. It may be arranged to The housing 1171 may substantially acoustically isolate
the opposite diaphragm, eg, the second diaphragm 1112. In this implementation, the first sound
detection component 1100a is configured to generate sound and acceleration signals, and the
second sound detection component 1100b generates substantially acceleration only signals.
When the signals for the first and second sound detection components 1100a, 1100b are
summed, the combined output of the microphone 1100 is substantially free of any component
due to acceleration as follows.
[0067]
As mentioned above, the component of the output signal caused by the sound is denoted herein
as S. The acceleration induced signal component generated by the first sound detection
component 1100a is denoted herein as A and the acceleration induced signal generated by the
second sound detection component 1100b The components are denoted herein as B.
[0068]
Thus, when the microphone 1100 disposed within the implementation of the housing 1171 as
shown in FIG. 11 is exposed to both sound and acceleration, the output signal Output 200 a
generated by the first sound detection component 1100 a is: It is a combination of a component
S induced by sound and a component A induced by acceleration as shown by Output 200 a = S +
A (5).
[0069]
03-05-2019
25
The output signal Output 200b of the second sound detection component 1100b contains only
the component B induced by acceleration, as the housing 1171 acoustically isolates the
diaphragm 1112: Output 200b = B (6)
As mentioned above, since the first and second sound detection components 1100a, 1100b are
rigidly mounted and directed in the opposite direction, the output signal induced by each
acceleration is: B = −A As in 7), they are equal in size and opposite in polarity. When the output
signals of the first and second sound detection components 1100a, 1100b are summed by the
electronic circuit 1120, the combined output Output 200 of the microphone 1100 is: Given by
Due to the opposite orientation of the two sound detection components 1100a, 1100b, the
output signal Output 200 of the microphone 1100 contains only the component S induced by the
sound and substantially contains either the component A or B induced by the acceleration
Instead, it is equal to the component due to the sound measured by the first sound detection
component 1100a.
[0070]
One skilled in the art will appreciate that other arrangements of the openings are within the
scope of the present disclosure.
[0071]
FIG. 12 is a flowchart illustrating a method 1200 for generating an output signal that is
substantially insensitive to physical acceleration or other movement of a recording device.
The method 1200 starts at block 1205, where a first signal is received from a first sound
detection device directed in a first direction. The first signal may include components caused by
both the measured sound and the physical acceleration of the first sound detection device.
[0072]
At block 1210, a second signal is received from a second sound detection device directed in a
second direction substantially opposite to the first direction. The second signal may include
components caused by both the measured sound and the physical acceleration of the second
sound detection device. The second received signal is generally caused by the same measured
03-05-2019
26
sound and the same physical acceleration.
[0073]
At block 1215, the first and second signals are summed. In some implementations, the sum is
achieved by simply combining the signal lines on which the first and second signals are received.
In some implementations, summing is accomplished using an active summing circuit. In some
implementations, as the opposite orientations of the first and second sound detection devices are
substantially equal due to acceleration, resulting in opposite signal components, the sum of the
first and second signals is The result is a combined signal that is substantially unaffected by
acceleration or other movement of the recording device. When the first and second signals are
summed, the acceleration components cancel each other.
[0074]
FIG. 13 shows an implementation of a headset that includes a dual diaphragm microphone. The
headset 1370 may include one or more acoustic enclosures 1371 configured to surround the
user's ear. One or more speakers 1373 may be included in each acoustic enclosure 1371 and
configured to transmit sound to the user's ear. FIG. 13 shows three possible positions of the
microphone in the headset 1370 at positions 1300a, 1300b and 1300c. The microphones
located at any of the possible microphone locations 1300a, 1300b, and 1300c may be
configured to reduce or eliminate any output signal components induced by acceleration, as
described above. Although three possible microphone positions 1300a, 1300b, and 1300c are
shown in FIG. 13, in some embodiments, the headset 1370 does not include a microphone at
each of the three positions 1300a, 1300b, and 1300c. May be For example, headset 1370 may
include only a single microphone at location 1300a, or headset 1370 may include two
microphones at locations 1300a and 1300c. In some embodiments, headset 1370 may include
more than two microphones, and may include microphones in headset 1370 or at any other
location on headset 1370.
[0075]
In some embodiments, the microphone located at position 1300a is generally located at the front
of the user's mouth when the headset is in use or at another position along the side of the user's
face As obtained, the headset 1370 may include a boom or other structure 1375 that may extend
03-05-2019
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from the acoustic enclosure 1371 or another component of the headset 1370. In some
embodiments, headset 1370 may include one or more microphones disposed at location 1300 b
outside acoustic enclosure 1371. In some embodiments, headset 1370 may include one or more
microphones disposed at location 1300 c within acoustic enclosure 1371.
[0076]
Dual-diaphragm microphones as described above reduce the effects of user movement on audio
signals captured or generated by the wearable device, such as earphones, headsets, headphones,
hearing aids. Or may be advantageously incorporated into other wearable devices.
[0077]
The methods disclosed herein comprise one or more steps or actions for achieving the described
method.
The method steps and / or method actions may be interchanged with one another without
departing from the scope of the claims. In other words, the order and / or use of particular steps
and / or actions deviate from the claims, unless a particular order of steps or actions is required
for proper operation of the described method. It may be changed without.
[0078]
The terms "attach," "attached," or other variations of the word "attach," or similar words, as used
herein, refer to either an indirect connection or a direct connection. It should be noted that there
is For example, if the first component is attached to or rigidly mounted to the second component,
the first component may be indirectly connected to the second component, Alternatively, it may
be connected directly to the second component. As used herein, the term "plural" refers to two or
more. For example, the plurality of components indicate two or more components.
[0079]
Various modifications to the implementations described in this disclosure may be readily
apparent to those skilled in the art, and the general principles defined herein may be made
03-05-2019
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without departing from the spirit or scope of the present disclosure. It may be applied to other
implementations. Thus, the claims are not intended to be limited to the implementations shown
herein but are to be accorded the widest scope consistent with the present disclosure, the
principles disclosed herein, and the novel features. Should be given. In addition, those skilled in
the art will recognize that relative terms such as "upper" and "lower" are sometimes used for ease
of describing the drawings, and in the orientation of the figures on the page properly oriented It
will be readily understood that corresponding relative positions may be indicated and may not
reflect the proper orientation of a particular component when implemented or in use.
[0080]
Certain features that are described herein in the context of separate implementations may also be
implemented in combination in a single implementation. Conversely, various features that are
described in the context of a single implementation can also be implemented separately in
multiple implementations or in any suitable subcombination. Further, the features may be
described above as acting in a particular combination, and may even initially be claimed as such,
although one or more from the claimed combination may be Features may be cut out of the
combination in some housings, and the claimed combination may be directed to subcombinations
or variations of subcombinations.
[0081]
Likewise, although the operations are shown in the drawings in a particular order, one of
ordinary skill in the art would appreciate that such operations need not be performed in the
particular order shown, or sequentially, or It will be readily appreciated that all the illustrated
operations may be performed to achieve a result. Additionally, the drawings may schematically
depict one or more exemplary processes in the form of a flow diagram. However, it is also
possible to incorporate other operations not shown in the figures in the example process shown
schematically. For example, one or more additional operations may be performed before, after,
simultaneously with, or between any of the operations shown in the figures. In certain
circumstances, multitasking and parallel processing may be advantageous. Furthermore, the
classification of the various system components in the implementations described above should
not be understood as requiring such classification for all implementations, and the program
components and systems described are: It should be understood that, typically, they can be
integrated together into a single software product, or packaged into multiple software products.
Furthermore, other implementations are within the scope of the following claims. In some
housings, the actions recited in the claims can be performed in a different order and still achieve
03-05-2019
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desirable results.
[0082]
DESCRIPTION OF SYMBOLS 100 microphone 101 body 102 diaphragm 102a outer side 102b
inner side 103 ground terminal 104 sensing electrode 105 output terminal 106 capacity 150
sound wave 200 microphone 200a 1st sound detection component 200b 2nd sound detection
component 201 1st body 202 1st Diaphragm 202a outer 202b inner 203 first ground terminal
204 first sensing electrode 205 first output terminal 206 first capacitance 211 second body 212
second diaphragm 212a outer 212b inner 213 second ground terminal 214 2 sensing electrodes
215 second output terminal 216 second volume 220 electronic circuit 225 coupled output
terminal 280 voltage source 280 a voltage source 280 b voltage source 700 dual diaphragm
microphone 700 a first sound detecting structure Element 700b Second sound detection
component 701 First body 702 First diaphragm 704 First sensing electrode 705 First output
terminal 706 First capacitance 711 Second body 712 Second diaphragm 714 Second Sensing
electrode 715 Second output terminal 716 Second capacitance 720 Electronic circuit 800 Dual
diaphragm microphone 870 Handheld device 871 Housing 873 Opening 900 Dual diaphragm
microphone 900a First sound detection component 900b Second sound detection component
902 First diaphragm 912 second diaphragm 971 housing 973a opening 973b opening 1000
dual diaphragm microphone 1002 first film 1012 second film 1071 single opening housing
1073 open Part 1100 Dual diaphragm microphone 1100a first sound detection component
1100b second sound detection component 1102 first diaphragm 1112 second diaphragm 1120
electronic circuit 1171 single opening housing 1173 opening 1300a microphone position 1300b
microphone position 1300c Microphone position 1370 Headset 1371 Acoustic enclosure 1373
Speaker 1375 Boom or other structure
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