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DESCRIPTION JP2016534648

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DESCRIPTION JP2016534648
Abstract: Each of the first and second noise reduction headsets included in the portable system
for enhancing communication between at least two users in close proximity to each other is
electrically supplied for supplying sound to the respective user's ear An acoustic transducer and
an audio microphone for detecting the sound of each user's voice and providing a microphone
input signal. A first electronic device integrated in the first headset and in communication with
the second headset generates a first side tone signal based on the microphone input signal from
the first headset, A first audio output signal based on the microphone input signal from the
headset, and combining the first side tone signal with a first far-end audio signal associated with
the second headset to generate a first audio signal; A composite output signal is generated to
provide the first composite output signal to the first headset for output by the electroacoustic
transducer of the first headset.
Conversation support
[0001]
The present disclosure relates to speech support, and in particular to enabling two or more
headset users in close proximity to one another to easily speak and easily hear one another in a
noisy environment.
[0002]
It can be very difficult to have conversations in noisy environments such as work sites, aircraft,
or crowded restaurants.
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Specifically, it goes without saying that others who listen to the speaker's voice struggle to hear
the speaker's voice, and must simply raise the voice to a level that they can easily hear. Speakers
can also struggle to determine how loud they should speak to others to hear. Likewise, the
listener must try to listen to the speaker and listen to what is said. Even when out loud, the ease
of communication and the ease of listening are impaired. In addition, speaking loudly may cause
inconvenience to nearby people and may reduce confidentiality.
[0003]
Various solutions have been tried to alleviate these problems. Hearing aids for people with
hearing loss may try to remove unwanted noise while amplifying the voice of the person talking
to the user, but with the restriction that the microphone is placed in the listener's ear There is a
disadvantage that the noise to noise ratio is bad. Also, hearing aids only provide the benefit of
listening and do not address the discomfort of trying to speak loudly. Other communication
systems such as headsets that cancel noise connected to the intercom used by the pilot may be
quite effective for those applications, but are connected to the dashboard intercom and the social
environment Or it is not suitable for general consumer use in a mobile environment, or even in
an aircraft environment, ie for private passengers.
[0004]
U.S. Patent Application No. 13 / 480,766 U.S. Patent Application Publication No.
2010/02702277
[0005]
In general, in one aspect, each of the first and second noise reduction headsets included in a
portable system for enhancing communication between at least two users in close proximity to
each other sounds into their respective ears An electroacoustic transducer for providing and an
audio microphone for detecting the sound of each user's voice and providing a microphone input
signal.
A first electronic device integrated in the first headset and in communication with the second
headset generates a first side tone signal based on the microphone input signal from the first
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headset, A first audio output signal based on the microphone input signal from the headset, and
combining the first side tone signal with a first far-end audio signal associated with the second
headset to generate a first audio signal; A composite output signal is generated to provide the
first composite output signal to the first headset for output by the electroacoustic transducer of
the first headset.
[0006]
Embodiments may include one or more of the following, in any combination. The first electronic
device may be directly coupled to the second headset and generates a second side tone signal
based on the microphone input signal from the second headset, and the microphone from the
second headset Generating a first far-end audio signal based on the input signal and combining
the second side tone signal with the first audio output signal to generate a second composite
output signal; A second combined output signal may be provided to the second headset for
output by the acoustic transducer. The second electronic device may be integrated into the
second headset, the first electronic device may communicate with the second headset through
the second electronic device, and the second electronic device may Generating a second side tone
signal based on the microphone input signal from the two headsets, generating a second audio
output signal based on the microphone input signal from the second headset, and generating a
second audio output The signal is provided as a first far-end audio signal to the first electronic
device, the first audio output signal from the first electronic device is received as a second farend audio signal, and the second side tone signal is A second combined output signal is provided
to the second headset for output by the electroacoustic transducer of the second headset, in
combination with the second far-end voice signal to generate a second combined output signal.
You may The second electronic device may be integrated into the second headset, the first
electronic device may communicate with the second headset through the second electronic
device, and the second electronic device is the second electronic device. Of the microphone input
signal from the headset may be transmitted to the first electronic device, while the first electronic
device generates a second side tone signal based on the microphone input signal from the second
headset And generates a second audio output signal for use as a first far-end audio signal based
on the microphone input signal from the second headset, and the second side tone signal as a
second far-end signal. A second combined output signal is generated in combination with the first
voice output signal as a voice signal to transmit a second combined output signal to a second
electronic device, the second electronic device The second headset receives the composite output
signal. It may be configured to supply the second headset for output by electro-acoustic
transducer.
[0007]
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The voice microphone and the first electronic device of the first headset may be configured to
generate a first microphone input signal by detecting the voice of each user while removing
ambient noise. The noise cancellation circuit that each of the first and second headsets may
include includes a noise cancellation microphone for providing an anti-noise signal to the
respective electroacoustic transducer based on the output of the noise cancellation microphone,
and the first electronic The device combines the first combined output signal with the anti-noise
signal provided by the noise cancellation circuit of the first headset for output by the electroacoustic transducer of the first headset, the first head It may be configured to supply a set. Each
of the first and second headsets includes a passive noise reduction structure. Generating the first
side tone signal may include applying a frequency dependent gain to the microphone input signal
from the first headset. Generating the first side tone signal may include filtering the microphone
input signal from the first headset to apply gain to the filtered signal. The first electronic device
may control the gain applied to the first side tone signal and the first audio output signal. The
first electronic device may control the gain applied to the first side tone signal and the first farend speech signal when generating the first combined output signal. The first electronic device
may control the gain applied to the signal under the direction of the user of the first headset. The
first electronic device may automatically control the gain applied to the signal. The first
electronic device may control the gain applied to the first side tone signal and the first audio
output signal, and may control the further gain applied to the first far-end audio signal.
[0008]
A third noise reduction headset may be included, and the third noise reduction headset detects
the sound of each user's voice and the electroacoustic transducer for supplying the sound to each
user's ear Microphone A voice microphone for providing an input signal. The second electronic
device may be integrated into the second headset, the third headset may be integrated into the
third electronic device, and the first electronic device comprises the second and third electronic
devices. The far-end audio signal in communication with the second and third headsets through
each of the devices and received by the first electronic device may include audio output signals
from both the second headset and the third headset . The first far-end audio signal received by
the first electronic device may include the first audio output signal, and the first electronic device
has removed the first audio output signal from the first far-end audio signal Thereafter, the first
far-end speech signal may be combined with the first side tone signal to generate a first
combined output signal.
[0009]
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The first electronic device may communicate with the third headset through the third electronic
device, and the third electronic device may generate a third side tone signal based on the
microphone input signal from the third headset. , And generates a third audio output signal
based on the microphone input signal from the third headset, as first and second far-end audio
signals to the first and second electronic devices. Transmitting a third audio output signal for use
and receiving a first audio output signal from the first electronic device and a second audio
output signal from the second electronic device; and a third side tone signal And the first and
second audio output signals as far-end audio signals to generate a third combined output signal
for output by the third headset's electro-acoustic transducer, the third combining Output signal
to the third headset It may be fed to. The second electronic device may communicate with the
third headset through the third electronic device. The second electronic device may communicate
with the third headset through the third electronic device via the first electronic device.
[0010]
In one aspect, a noise reduction headset generally used in a portable system to enhance
communication between at least two users in close proximity to one another comprises an
electro-acoustic transducer for delivering sound to the user's ear; An audio microphone for
detecting the user's voice and providing a microphone input signal, and electronic circuitry
integrated in the headset and including an interface for communicating with the second headset.
The electronic circuit generates a first side tone signal based on the microphone input signal,
generates a first audio output signal based on the microphone input signal, and is associated with
the first side tone signal and the second headset. The first far-end audio signal is combined to
produce a first combined output signal to provide the electroacoustic transducer with a first
combined output signal for output.
[0011]
Embodiments may include one or more of the following, in any combination. The electronic
circuit may apply a gain to the first side tone signal and the first audio output signal. The
electronic circuit may apply a gain to the first side tone signal and the first far-end speech signal
when generating the first combined output signal.
[0012]
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The advantage is that in a noisy environment, the user listens to his / her voice, hears the other,
and hears the other's voice without struggling to listen and talk, and without disturbing others.
Including being able to engage in a conversation involving all of
[0013]
All of the above examples and features may be combined in any technically possible manner.
Other features and advantages will be apparent from the specification and claims.
[0014]
FIG. 2 shows the configuration of a headset and an electronic device used for conversation. FIG. 2
shows the configuration of a headset and an electronic device used for conversation. FIG. 2
shows the configuration of a headset and an electronic device used for conversation. FIG. 4
shows a circuit for implementing the device of FIGS. 1 to 3; FIG. 4 shows a circuit for
implementing the device of FIGS. 1 to 3; FIG. 4 shows a circuit for implementing the device of
FIGS. 1 to 3; FIG. 4 shows a circuit for implementing the device of FIGS. 1 to 3; FIG. 4 shows a
circuit for implementing the device of FIGS. 1 to 3; Fig. 5 shows a more detailed implementation
of the circuit of Fig. 4; FIG. 10 is a table listing the signals referred to in the description of FIGS.
[0015]
A system for enabling two or more headset users in close proximity to one another to talk and
hear one another easily in a noisy environment, as shown in FIG. And at least one electronic
device in communication with the headset. Each headset 102, 104 shields the user from ambient
noise, which may be done passively by the acoustic structure or actively by containing an active
noise reduction (ANR) system. May be Active noise reduction systems will generally work with
passive noise reduction functions. Each headset also includes an audio microphone 105 for
detecting its own user speech. In some examples, a voice microphone is also used as part of an
ANR system, such as a feedforward microphone that detects ambient sound or a feedback
microphone that detects sound in the user's ear canal. In another example, the voice microphone
is optimized to detect the user's voice and remove ambient noise, such as a boom microphone or
microphone array configured to be sensitive to sound coming from the direction of the user's
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mouth Individual microphones. Each headset provides its audio microphone output signal to the
electronic device 106.
[0016]
In some instances, as shown in FIGS. 2 and 3, each headset is connected to a separate electronic
device, ie, devices 108 and 110 of FIG. The four users shown in FIG. 3 are speaking using
headsets 102, 104, 116, 118 connected to respective electronic devices 108, 110, 120, 122. In
multiple conversations, a single electronic device, such as device 106 of FIG. 1, or two or more
(but fewer than the number of headsets) devices may be used to communicate with each other
using a subset of headsets. In some instances, the electronic device is fully integrated into the
headset. 2The processing described below as being performed in one or more circuits may be
performed in each of the distributed devices from FIGS. 2 and 3 or in an all-in-one device such as
the shared device of FIG. It may be performed in one of the distributed devices, or in any
practical combination, so as to generate a signal for redistribution to a good or other distributed
device.
[0017]
Although the headset is shown as being connected to the electronic device by a cord, this
connection may be wireless using any suitable wireless communication method such as
Bluetooth, WiFi, or a dedicated wireless interface You can also In addition to the headset, the
electronic devices may communicate with each other using a wired or wireless connection. The
wireless connection used for communication between electronic devices may be different than
that used with the headset. For example, electronic devices may use WiFi to communicate with
each other, while headsets use Bluetooth to communicate with their respective electronic devices.
The electronic devices may use multiple methods simultaneously to communicate with one
another. Throughout this application, reference is made to the various acousto-electronic signals
that flow inside the headset and the electronic device and also between the headset and the
electronic device. The names of the signals and their reference symbols in the figure are listed in
FIG. 10 for reference.
[0018]
1
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One or more electronic devices, as shown in FIG. 4, the audio microphone signal from each
headset is treated in two different ways. Two identical systems 202 and 204 shown in FIG. 4 may
include the circuits in each of the electronic devices of FIGS. 2 and 3 or in a single electronic
device as in FIG. These systems also include acoustic elements that include headset attenuation,
as discussed below. The components of the circuit may be implemented using discrete elements
or may be implemented by software code operating on a DSP or other suitable processor in one
or more electronic devices.
[0019]
A voice microphone 206, each system receives a voice acoustic input V1 or V2, a first
equalization stage 207, a first gain stage 208, a second equalization stage 209, and a second gain
stage 210. , An attenuation block 212, and an output summing node 214 which provides an
acoustic output Out1 or Out2. The voice acoustic inputs V1 and V2 represent the user's actual
voice, and the acoustic outputs Out1 and Out2 are output acoustic signals heard by the user.
Ambient noises N1 and N2 are also detected by the microphone 206, passed to the gain stage,
and filtered by the microphone's noise rejection capability. The microphone is more sensitive to
the speech input than the ambient noise by the noise rejection ratio M. The combined signal 211
from the microphone, ie V1 + N1 / M and V2 + N2 / M, may be referred to as a microphone input
signal. Of those signals, N1 / M and N2 / M represent unwanted background noise. 2Although
one system is shown to contain different ambient noise signals N1 and N2, these noises may be
practically identical, depending on the distance between the user and the acoustic environment.
Ambient noises N3 and N4 in the user's ear may also be identical to N1 or N2 and are attenuated
by the attenuation block 212 in each system, the attenuation block 212 being capable of passive
noise reduction of the headset if present And a combination of active noise reduction capabilities.
Although the resulting residual noise is shown to enter the output summing node, in the actual
implementation, the electronic signals are first summed and output by the output transducer, the
output of the transducer remaining in the user's ear canal Acoustically combined with noise. That
is, as shown in more detail in FIG. 9, the output summing node 214 represents the output
transducer combined with its acoustic environment.
[0020]
2
The circuits 202 and 204 apply the same processing to the two microphone input signals.
Initially, each microphone input signal is filtered by a first equalization stage 207 applying a
filter K s and amplified by a first gain stage 208 applying a gain G s. The filter K s and the gain G
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s change the shape and level of the speech signal in order to optimize the speech signal to be
used as a side tone signal. People should tend to speak louder when they can not hear their voice
due to loud noises and the like. This has the effect of tensing the speaker's voice. On the other
hand, when wearing headphones or noise canceling headphones that block noise in a noisy
environment, one will tend to talk more comfortable and quieter, but naturally naturally You will
also be plagued by the occlusion effect that prevents you from talking to An occlusion effect is a
change in how a person's voice is heard by the person when the ear is covered or occluded. For
example, the occlusion may amplify low-frequency components so that the human voice may
sound unnatural to the person. The sidetone signal is a signal that is played back to the speaker's
ear so that the speaker can hear his / her voice. When the sidetone signals are scaled
appropriately, the speaker can intuitively control his voice level to a comfortable level and speak
naturally. The sidetone filter K s shapes the speech signal to compensate for the way the
occlusion effect alters the voice of the speaker's voice when the speaker's ear is closed, so that
the sidetone signal is appropriate In addition to being at the same level, it sounds like the user's
actual voice when not wearing the headset.
[0021]
The microphone input signal 211 is also equalized by applying the audio output filter K o by the
second filter 209 and scaled by applying the audio output gain G o by the gain stage 210. The
filter and gain of the audio output are selected to be able to be heard and understood by the user
of the second headset when the audio signal from the microphone of one headset is reproduced
in the second headset . The filtered and scaled audio output signal 213 is each delivered to the
other headset where it is combined with the filtered and scaled side tone signal 215 in each
headset to produce the synthesized audio output Out1 or Out2. Generate When discussing one
headset, the audio output signal 213 from the other headset can be referenced and reproduced
as a far-end audio signal by the discussed headset. As mentioned above, the microphone 206
takes the ambient noise N1 and N2 and delivers it along with the audio signals V1 and V2 to the
filter and gain stages. Ambient noises N3 and N4 are attenuated by the noise reduction function
shown as attenuation block A of the headset, whether active or simply passive, to attenuate the
attenuated noise signals A · N3 or A · N4. Are heard in each headset along with the synthesized
sidetone signal 215 and the far-end audio signal 213 (ie the audio output signal from the other
headsets), each of the sidetone signal and the far-end audio signal being from the respective
microphone Including undesirable background noise N1 / M and N2 / M.
[0022]
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The gain G s is selected taking into account the noise rejection capabilities of the voice
microphone and the noise attenuation capabilities of the headset, allowing the user to hear their
voice over residual noise and speak naturally at a comfortable level Provide a side tone signal at
the level you can. At the same time, the gain G o is selected taking into account the same factors,
and the audio output signal to each headset at a level where each user can hear the other user's
voice at a comfortable and understandable level Supply. In some examples, the gain G s is set to
balance the user's own comfort by providing an appropriate sidetone level, and the voice
microphone provides a useful voice signal of the speaker Ensure that the user speaks loudly so as
to detect voices having a sufficient signal to noise ratio (SNR) ratio. The circuit shown in FIG. 4
has complementary audio outputs Out1 = KsGs (V1 + N1 / M) + A · N3 + KoGo (V2 + N2 / M) and
Out2 = KsGs (V 2 + N 2 / M) + A · N 4 + K o G o (V 1 + N 1 / M) FIG. 4 assumes that the two
headsets are the same model with the same preset filter, gain, ambient noise attenuation, and
microphone response. The filters K s and K o and the gains G s and G o may be determined
experimentally based on the actual sound of the headset in which the circuit is implemented and
the sensitivity of the microphone. User control may also be provided so that the user can
compensate his / her hearing by adjusting the sidetone gain or filter add / drop. In order to
simplify the later figures, the filters and the corresponding gains are simplified to a common
equalization / amplification block, only the gain term G is shown in the figure, but the formula
still has the filter term K included. It should be understood that any gain block may include
equalization applying a filter that corresponds to the labeled gain. Filters are sorted and
discussed only if their operation is independent of the associated gain terms.
[0023]
FIG. 5 shows a variant to the circuit of FIG. 4 in which each of the circuits 216 and 218 is
equalized with the value Kio (Vi + Ni / M) instead of applying a gain G o prior to transmission
Audio output signal 221 is transmitted to the other circuit in gain blocks 220 and 222 before
gain G1 in or G2 in is applied to produce far-end audio signal 223. Audio output filters 224 and
226 remain with the source device to filter the microphone input signal based on the
characteristics of the corresponding microphone, but in some cases are shown as being different
between the devices. This separation allows the user to adjust the gain of the far-end speech
signal in the same manner as the sidetone gain adjustment described above to compensate for
his hearing or local noise changes. If the headsets are different models with different responses,
the default values of the gains G1 in and G2 out may also be different. In FIG. 5, the gains of the
voice input gain blocks 220 and 222 are numbered G1 in and G2 in and the filters of the voice
output equalization blocks 224 and 226 have K1 o and K1 o to show that they can be different. It
is numbered K2 o (note that the output filter and gain may also be different in the example of
FIG. 4). The sidetone filters K1 s and K2 s (not shown) are also different, and the acoustic output
is: Out1 = K1 s G1 s (V1 + N1 / M) + A · N3 + K2 o G1 in ( V2 + N2 / M) and Out2 = K2s G2s (V2
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+ N2 / M) + A.N4 + K1 o G2 in (V1 + N1 / M).
[0024]
The example of FIG. 4 and the example of FIG. 5 may be combined, with gain applied to the audio
output signal, both in the headset generating the audio output signal and in the headset receiving
the audio output signal. This is illustrated in FIG. 6, where circuit 224 includes output gain stage
230 and input gain stage 220, respectively, and circuit 226 includes output gain stage 232 and
input gain stage 222, respectively. The filter is not shown. By applying the gain to both headsets,
the headset producing the audio signal can apply the gain Gio based on the acoustic knowledge
of the microphones of the same headset, and the audio signal can be The receiving headset can
apply an additional gain (or attenuation) Gi in based on the acoustic knowledge of the output part
of the same headset and the preference of the user. In this case, as shown in FIG. 5, the audio
output signal 231 sent between the headsets is different from the far-end audio signal 233
supplied to the output. For completeness, microphone de-noising and sidetone gains are also
separately distinguished in microphones 234 and 236 and gain stages 238 and 240. In this case,
the sound output is Out1 = G1s (V1 + N1 / M1) + AN3 + G2o.G1in (V2 + N2 / M2) and Out2 =
G2s (V2 + N2 / M2) + AN4 + G1 o · G2 in (V1 + N1 / M1)
[0025]
In some instances, as shown in FIG. 7, the system is expanded to have more than two headset
users sharing a conversation. Similar to FIG. 6, the systems 402, 404 and 406 of FIG. 7 use the
simple headset circuits of FIG. 4, but use the circuits of FIG. 5 or 6 to provide additional
functionality of those circuits. It may be carried out. As shown, each of the audio output signals G
o (Vi + Ni / M) is provided to each of the other headset circuits. These circuits are identical to FIG.
4 except that summing nodes 408, 410 and 412 have more inputs. In each headset circuit, the
local sidetone signal G s (Vi + Ni / M) is combined with all the far-end speech signals to produce
respective acoustic outputs.
[0026]
As can be seen in FIG. 7, even when the simple circuit from FIG. 4 applying all the same gain is
used, a significant number of far-end voice signals are mixed in each headset to produce their
respective acoustic output The complexity of the system increases as additional users are added.
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This can be simplified by combining the sidetone signal and the audio output signal, ie by setting
G s = G o, so that all audio output signals are combined at one time for each headset , And the
synthesized signal includes the user's own voice of each headset as a side tone. However, in this
way, very low latency communication and processing is performed so that the copy of the user's
own voice, transmitted and combined, is kept close enough in time to the original utterance in
time so as not to confuse the user. The system will be needed (very embarrassed to hear his voice
played a few milliseconds late). The alternative shown in FIG. 8 is to combine all audio output
signals at summing node 420 into a common speech output signal 421 while preserving local
sidetone signals. Each headset circuit 422, 424, 426 then subtracts the appropriately delayed
and scaled copy of the microphone input signal 423 from the common audio signal at its own
summing node 428 to provide the user's own from the common signal. Remove the voice. If all
headsets apply the same gain G o to their output speech signal, the appropriate gain applied by
the gain stage 430, which may be identical in each headset, used to reduce the local speech
signal is , Simply -G o. The delay may also be determined a priori and incorporated into gain
stage 430 if the communication system used to share the audio output signal is sufficiently
understood and reproducible, or the delay may be an appropriate adaptive filter It can be
determined on the fly by With this implementation, an unlimited number of headsets can be used
without increasing the complexity of each headset, which requires a device that adds all of the
audio output signals. Only.
[0027]
FIG. 9 shows the system 202 of FIG. 4 in more detail and includes an example of a noise
cancellation circuit abstracted as a damping block 212 and an electro-acoustic system abstracted
as a summing node 214 in FIG. The same noise cancellation circuit and acoustic system may be
applied to any of the corresponding circuits of FIGS. 5-8. The passive attenuation element 502,
included in the attenuation block 212, represents the physical attenuation provided by the
earbud headphone ear cup or in-ear headphone housing and the headset structure such as the
ear tip and is attenuated to noise N3 Apply A p. Attenuation block 212 may also include an active
noise reduction circuit 508 connected to one or both of feed forward microphone 504 and
feedback microphone 506. The microphone supplies a noise signal to the ANR circuit 508, which
applies an active noise reduction filter to produce the anti-noise sound reproduced by the output
transducer 510 of the headset 102. Active damping is represented as having a value A a.
Acoustic structures and electronic circuits for such ANR systems are described in US Patent
Application No. 13 / 480,766 and US Patent Application Publication No. 2010/02702277, both
of which are hereby incorporated by reference.
[0028]
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The output electronic signal including the sidetone signal G s (V 1 + N 1 / M), the far-end voice
signal (voice output signal Vo 2 from the other headset), and the anti-noise signal A a · N 3 is ,
Electronically summed to produce a combined output signal 511 at the input 214a of the output
electroacoustic transducer 510. The acoustic output of the transducer is then added acoustically
to the residual noise A p · N 3 entering the headphones and represented as acoustic sum 214 b
to form the acoustic output Out 1 referenced in the previous figures. The composite acoustic
signal of the acoustic output is detected by both the feedback microphone 506 and the tympanic
membrane 512.
[0029]
Embodiments of the above-described systems and methods include computer components and
computer-implemented steps that will be apparent to those skilled in the art. For example, it
should be understood by those skilled in the art that computer-implemented steps may be stored
as computer-executable instructions on a computer-readable medium, such as flash ROM, nonvolatile ROM, and RAM. Furthermore, it should be understood by those skilled in the art that
computer executable instructions may be executed on various processors such as, for example,
microprocessors, digital signal processors, gate arrays, and the like. For ease of explanation,
although not all of the above-described steps or elements of the system and method are
described herein as being part of a computer system, one skilled in the art would recognize that
each step or element It will be appreciated that may have a corresponding computer system or
software component. Accordingly, such computer systems and / or software components are
enabled by the description of the corresponding steps or elements (ie, their functionality) and are
within the scope of the present disclosure.
[0030]
Several embodiments have been described. However, it will be understood that further
modifications can be made without departing from the scope of the inventive concept described
herein, and thus other embodiments are within the scope of the following claims.
[0031]
102 Headset 104 Headset 105 Voice Microphone 106 Electronic Device 108 Electronic Device
110 Electronic Device 116 Headset 118 Headset 120 Electronic Device 122 System 204 System
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206 System 206 Voice Microphone 207 First Equalization Stage 208 First Gain Stage 209
Second Equalization Stage 210 Second Gain Stage 211 Combined Signal 212 Attenuation Block
213 Voice Output Signal 214 Output Summing Node 214a Input 214b Total Acoustics 215
Combined Side Signal 216 Circuit 218 Circuit 221 Equalized Voice Output Signal 220 Gain block
222 Gain block 223 Far-end voice signal 224 Voice output filter 226 Voice output filter 230
Output gain stage 231 Voice output signal 232 Output gain stage 233 Far-end voice signal 234
Microphone 236 Microphone 238 Gain stage 240 Gain stage 402 System 404 System 406
System 408 Addition Node 410 Addition No 412 summing node 420 summing node 421
conversational output signal 422 headset circuit 426 headset circuit 426 headset circuit 428
summing node 430 gain stage 502 passive attenuation element 504 feed forward microphone
506 feedback microphone 508 ANR circuit 510 output transducer 511 composite output signal
511 512 tympanic membrane
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