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JP2014112830

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2014112830
Abstract: A method and system for enhanced stereo recording in an electronic device. The
processing of the signals generated by the first microphone 120 and the second microphone 130
may be configured based on the evaluated stereo recording performance. The configuration may
comprise adaptively modifying the process to match or approximate ideal performance to
enhance stereo recording performance. The evaluation of the stereo recording of the electronic
device 100 is based on the type of the first microphone 120 and the second microphone 130 and
/ or based on the distance 140 between the first microphone 120 and the second microphone
130. May be performed. The process may be adaptively modified to simulate directional
reception of signals by the first microphone 120 and the second microphone 130 when the
microphones are omnidirectional. [Selected figure] Figure 1
Enhanced stereo recording system and method in a portable device
[0001]
Aspects of the present application relate to speech processing. In particular, certain
implementations of the present disclosure relate to enhanced stereo recording in portable
devices. Priority claim
[0002]
This application refers to and claims priority to, and claims benefit from, U.S. Patent No. 5,648,
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1
806, filed November 8, 2012, entitled "Enhanced Stereo Recording in Portable Devices." The
aforementioned application is incorporated herein by reference in its entirety.
[0003]
Existing methods and systems for managing audio input / output components (eg, speakers and
microphones) in electronic devices can be inefficient and / or expensive. By comparing
conventional methods with some aspects of the method and apparatus described below in the
present disclosure with reference to the drawings, other limitations and disadvantages of the
conventional methods are addressed. It becomes clear to the trader.
[0004]
US Provisional Patent Application No. 61 / 723,797
[0005]
The system of the invention comprises an electronic device comprising one or more circuits and
a first microphone and a second microphone, wherein the one or more circuits are adapted to the
stereo recording performance of the electronic device. , Evaluation using the first microphone
and the second microphone, and processing signals generated by the first microphone and the
second microphone based on the evaluated stereo recording performance. The method is
characterized in that the processing is adaptively modified to enhance stereo recording
performance and fit or approximate to ideal performance.
The method of the present invention is an electronic device comprising a first microphone and a
second microphone, wherein stereophonic recording performance of the electronic device is
evaluated using the first microphone and the second microphone; Processing the signals
generated by the one microphone and the second microphone based on the evaluated stereo
recording performance, and adapting the processing to match or approximate the ideal
performance in order to enhance the stereo recording performance And correcting.
[0006]
Illustration showing an example of an electronic device with two microphones pointing in the
same direction Illustration showing an example of a portable device with two microphones facing
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2
in the same direction and spaced close to each other Support enhanced stereo recording
Illustration of the structure of an example of an electronic device comprising a plurality of
microphones that can be set to be an illustration of an example of a recording scenario of an
electronic device having two omnidirectional microphones pointing in the same direction
Flowchart illustrating an example of processing
[0007]
The system and / or method for enhanced stereo recording in a portable device according to the
present invention is schematically illustrated and / or described in connection with at least one
figure and as more fully described in the claims. Provided.
These and other advantages, aspects and novel features of the present disclosure, as well as
details of exemplary implementations thereof, will be more fully understood from the following
description and figures.
[0008]
Certain implementations are permitted in methods and systems for enhanced stereo recording in
electronic devices, particularly portable devices. As used herein, the terms "circuit" and "circuitry"
may constitute physical electronic components (ie, hardware) and hardware, or may be
implemented by hardware And / or any software and / or firmware ("code") that may otherwise
be associated with the hardware. As used herein, for example, the particular processor and
memory comprise a first "circuit" when executing a first plurality of code lines, and a second
"circuit" when executing a second plurality of code lines. Two "circuits" may be provided. As used
herein, “and / or” means an item in any one or more lists linked by “and / or”. For example,
"x and / or y" means any element of the three-element set {(x), (y), (x, y)}. In another example, “x,
y and / or z” is a set of seven elements {(x), (y), (z), (x, y), (x, z), (y, z) ) Means any element of (x,
y, z)}. As used herein, the terms "block" and "module" refer to functions that can be performed by
one or more circuits. As used herein, the term "example" is meant to be used as a non-limiting
example, instance, or illustration. As used herein, the terms “for example” and “for example”
(eg. ) Introduces a list of one or more non-limiting examples, cases or examples. As used herein,
the circuit configuration is the hardware required by the circuit configuration to perform the
function regardless of whether the performance of the function is disabled or disabled by some
user-configurable settings. It is "operable" to perform the function whenever it has wear and code
(if code is required).
10-05-2019
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[0009]
FIG. 1 illustrates an example of an electronic device comprising two microphones pointing in the
same direction. Referring to FIG. 1, an electronic device 100 is shown.
[0010]
Electronic device 100 may be equipped with appropriate circuitry to perform or support various
functions, operations, applications, and / or services. The functions, operations, applications, and
/ or services that electronic device 100 performs or supports may be performed or controlled
based on user instructions and / or pre-configured instructions.
[0011]
In some cases, electronic device 100 may support communication of data, such as via wired and
/ or wireless connections, in accordance with one or more supported wireless and / or wired
protocols or standards.
[0012]
In some cases, electronic device 100 may be a portable device, that is, the user may intend to
hold the device in use while in use, thereby moving and / or at various locations. Enables the use
of the device.
In this regard, the electronic device 100 may be designed and / or configured to be easy to move,
and when the user moves, the user may easily move while holding the hand. Electronic device
100 may be configured to perform at least a portion of the operations, functions, applications
and / or services supported by the device in motion. Examples of electronic devices that are
portable devices include communication portable devices (eg, cell phones, smart phones, and / or
tablets), computers (eg, laptops), media devices (eg, portable media players and cameras), and the
like. The electronic device 100 may further be a wearable device. That is, the electronic device
100 may be worn by the user of the device rather than by the user. Examples of wearable
electronic devices may include digital watches and watch-like devices (eg, eye watches). However,
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the present disclosure is not limited to any particular type of electronic device.
[0013]
Electronic device 100 may support voice input and / or output. The electronic device 100
incorporates, for example, a plurality of speakers and microphones for use in outputting and / or
capturing audio, with appropriate circuitry for driving, controlling and / or utilizing the speakers
and microphones. You may For example, as shown in FIG. 1, the electronic device 100 may
include a speaker 110 and a pair of microphones 120 and 130. The speaker 110 may be used
when outputting an audio (or another sound) signal from the electronic device 100. On the other
hand, microphones 120 and 130 may be used to input (eg, capture) voice or another acoustic
signal into the electronic device. Using two microphones (120 and 130) may be desirable as it
may support stereo effects. In this regard, the human brain may experience a stereo effect when
receiving and / or capturing a common signal in both ears, with some difference in amplitude
and phase. The two ears are then located at a distance between them, and the direction of the
selection sensitivity of each ear is reversed, that is, depending on the position of the signal
source, one ear is faster than the other. And due to the fact that they can capture sound strongly,
stereo effects can also occur. Although the effect that the phase difference has on the stereo
experience is generally small (limited to the low frequency region), the amplitude difference may
be a more significant attribute that affects this stereo experience. Thus, two microphones may be
used to hold stereo effects during recording (eg, by an electronic device such as electronic device
100), and in particular may be arranged for stereo effects. In particular (for example, by placing a
microphone on the same side or surface of the electronic device or on its case, and / or a certain
amount that is sufficient to mimic reception by the human ear (of speech) The microphones may
be arranged such that the microphones may receive signals from the same signal source by
placing the microphones a distance (distance 140 apart) therebetween. In order to achieve
optimal stereo recording performance, it may be necessary to arrange the microphones in a
specific manner (eg, spaced apart by a significant distance, eg, 15 cm apart, and / or in a manner
having directional reception characteristics) Sometimes.
[0014]
In some cases, it may be desirable to place the microphones in close proximity to one another.
For example, in a portable communication device, a microphone for use in voice recording may
also be used, for example, to support functions such as noise reduction. Using modern noise
reduction techniques in portable communication devices may, for example, incorporate the use of
two microphones that may be used to pick up ambient noise. In some cases, the noise reduction
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performance is generally best when the two microphones are placed close to each other (e.g., in
the range of 1-2 cm). This ensures that the correlation between the noise picked up by both
microphones is significantly higher and thus the performance of noise reduction with two
microphones may be significantly better. Placement of this type of microphone (eg, placing the
microphones close to each other) may enhance another function, such as noise reduction, or
because space is limited. It may in particular be implemented in certain types of electronic
devices, for example portable communication devices and other portable electronic devices. An
example of such an apparatus is shown, for example, in FIG.
[0015]
However, such an arrangement of microphones can also degrade the performance of stereo
recordings. This occurs, for example, because of the small difference between the two
microphones as a result of the two microphones being placed very close to one another for
stereo recording. Thus, in various implementations according to the present disclosure, stereo
recording can be enhanced in devices having microphones that are very close to each other and
not optimally placed, such as in the range of 1-2 cm. Enhancement of stereo recording may for
example be usually realized by using adaptive processing. In this adaptive process, it is possible
to simulate the results achieved by using, for example, microphones that are spaced apart and /
or with directional reception characteristics in an optimal arrangement. This will be described in
detail in connection with the following figures.
[0016]
FIG. 2 illustrates an example of a portable device with two microphones facing in the same
direction and spaced close to one another. Referring to FIG. 2, a smartphone 200 and a portable
camera 250 are shown.
[0017]
Each of the smartphone 200 and the portable camera 250 may incorporate multiple (eg, two)
microphones to support stereo recording. For example, the smartphone 200 comprises a pair of
microphones 210 and 220 (arranged as right and left microphones, respectively) and the
portable camera 250 is arranged as a pair of microphones 260 and 270 (respectively right and
left microphones To provide Nevertheless, although the two microphones are shown to be on the
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same side in each of the smartphone 200 and the portable camera 250, the present disclosure is
not limited thereto. Rather, in the case where two microphones may be placed on different sides
of the device, for example, one microphone (eg, microphone 210) is placed on the front of
smartphone 200 and another microphone (eg, microphone 220) is a smartphone It should be
appreciated that although placed on the back of 200, the two microphones may still be placed
close to each other (e.g., both placed at the bottom portion of the smartphone). Recording to
capture ambient sounds that may originate from various sources (eg, at distances from zero to
several meters) using microphones (microphones 210 and 220 of smartphone 200 and
microphones 260 and 270 of portable camera 250) You may The recording may be performed
along with another operation of the device (e.g. during image capture)
[0018]
However, in some cases, due to the relatively small dimensions of certain portable devices, as
well as design considerations, the physical spacing between the microphones may be limited,
requiring the microphones to be placed close to each other It becomes. In order to optimize
physical space limitations and / or specific functions (e.g. noise reduction) in portable devices
such as smartphones and portable portable cameras, for example, between the microphones of
the smartphone 200 and the camera 250 (E.g., the spacing 230 between the microphones 210
and 220 in the smartphone 200 and the spacing 280 between the microphones 260 and 270 in
the portable camera 250) may be relatively small. For example, in both the smartphone 200 and
the camera 250, the microphones embedded therein may be the same omnidirectional
microphones located in front of the device, separated by a slight horizontal distance from one
another. For example, the microphones 210 and 220 of the smartphone 200 may be placed at
the bottom of the front with a distance of 1 cm (230) between them to align with the horizon. On
the other hand, the microphones 260 and 270 of the camera 250 may be diagonally spaced by a
1 cm horizontal distance (280) in both portrait and landscape mode. By only a slight spacing
between the two microphones of each of the smartphone 200 and the camera 250 (as well as by
the fact that the type is an "omnidirectional" microphone), the difference between the two
microphones may be small.
[0019]
Thus, in various implementations, a device having a microphone arrangement that supports
stereo recording but may reduce stereo recording performance may incorporate adaptive
structures and / or features to enhance stereo recording. . Stereo recording enhancement may be
realized, for example, by using adaptively modified digital processing. This digital processing may
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be applied to the signals originating from the pair of microphones to produce two new output
signals with enhanced stereo effects. Thus, by using adaptive correction digital processing in this
manner, it may be possible to use two microphones placed very close to each other (e.g. about 12 cm), stereo effect Can be generated. Audio with this stereo effect can be comparable to the
stereo effect of recording with two microphones placed at an optimal spacing (e.g. 15 cm) for
stereo recording. In one implementation, an audio signal received from different directions and
captured by a close pair of microphones may have an appropriate strength depending on the
direction of arrival of each of the two output signals. Thus, the individual directions may be
clearly recognized by the human ear during playback. Due to the small distance between the
microphones, the amplitudes of the two original input signals do not differ significantly from one
another. Thus, small phase differences of the input signal may be converted to significant
amplitude differences between the two output signals by applying adaptive processing. An
example structure (and thereby adaptive processing applicable thereto) will be described in detail
with respect to FIGS. 3 and 4.
[0020]
FIG. 3 illustrates the structure of an example electronic device comprising multiple microphones
and configurable to support enhanced stereo recording. Referring to FIG. 3, an electronic device
300 is shown.
[0021]
Electronic device 300 may be similar to electronic device 100 of FIG. In this regard, electronic
device 300 may be configured to support voice input and / or output operations. The electronic
device 300 may, for example, comprise multiple audio input and / or output components. For
example, electronic device 300 may include microphones 3301 and 3302. Furthermore, the
electronic device 300 may also incorporate circuitry to support voice related processing and / or
manipulation. For example, electronic device 300 may include processor 310 and voice codec
320.
[0022]
Processor 310 processes data, controls or manages operations (eg, of electronic device 300 or
components thereof), and performs tasks and / or functions (or controls any such task / function)
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It may be provided with suitable circuitry that can be configured as such. Processor 310 may, for
example, operate and / or execute an application, program and / or code that may be stored in a
memory (not shown). Further, processor 310 may control the operation of electronic device 300
(or components or subsystems thereof) using one or more control signals. Processor 310 may
comprise a general purpose processor, which may be configured to perform or support certain
types of operations (eg, operations related to voice). Processor 310 may also include a special
purpose processor. For example, processor 310 may comprise a digital signal processor (DSP), a
baseband processor, and / or an application processor (eg, an ASIC).
[0023]
Audio codec 320 may comprise suitable circuitry that can be configured to perform voice
encryption / decryption operations. For example, audio codec 320 may be used to route signals
processed by audio codec 320 to the appropriate input and output ports of audio codec 320, one
or more analog to digital converters (ADCs), One or more digital to analog converters (DACs) and
one or more multiplexers (mux) may be provided.
[0024]
In operation, electronic device 300 may support input and / or output of audio signals. For
example, microphones 3301 and 3302 may capture audio and generate corresponding analog
audio input signals (eg, analog signals 342 and 344). This analog audio input signal may be
forwarded to the audio codec 320. Audio codec 320 may convert analog audio input (e.g., via an
ADC) into digital audio signals (e.g., signals 352 and 354). This digital audio signal may be
transferred to processor 310 (eg, via an I <2> S connection). However, in some cases, analog-todigital conversion (thus, if analog-to-digital conversion is the only reason to use speech codec
320, speech codec 320) may, for example, microphones 3301 and 3302 be digital microphones.
When the signal is directly input to the processor 310 from the microphones 3301 and 3302, it
may be omitted. Processor 310 may then apply digital processing to the digital audio signal.
[0025]
In one case, processor 310 may be configured to support stereo recording. Thus, in one case the
processor 310 is based on the processing on the audio input signals generated by the
microphones 3301 and 3302, the left signal 362 and the right signal 364 (ie signals for each of
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the listener's left and right ears, When the ear receives, it may generate a signal that can
generate a stereo effect in the brain. However, stereo recordings implemented in electronic
device 300 may be degraded due to the placement of the microphones utilized on electronic
device 300. For example, microphones 3301 and 3302 may be omnidirectional microphones (ie,
over a wide range rather than over narrow radio waves, for example, due to the small space
within electronic device 300 and / or to allow for optimal noise reduction processing). , And / or
may be placed in close proximity to each other (e.g., only 1-2 cm apart).
[0026]
Thus, in various implementations, the electronic device 300 may be configured to support
enhanced recording. The enhanced stereo recording may be used to overcome the disadvantages
or deficiencies of stereo recording that may be caused by non-optimal placement of the
microphones (eg, microphones 3301 and 3302) or their characteristics. Enhanced stereo
recording may be implemented, for example, with an adaptive enhancement function
implemented (e.g., at processor 310) during processing of the input audio signal (i.e., the signal
that the microphone captures). As such, the structure of the electronic device 300 may be
specifically modified to enable or support these functions and / or to perform those functions
when needed. An example of adaptive processing that may be implemented in an electronic
device (e.g., via processor 310) is described in more detail with respect to FIG.
[0027]
Structures and / or functions similar to those described for the electronic device 300 may be
used in devices having a microphone arrangement that exhibits similar disadvantages with
respect to stereo recording and requires enhanced stereo recording. These devices are, for
example, portable devices with closely-located (and generally omnidirectional) microphones, such
as a smartphone 200 and a camera 250.
[0028]
FIG. 4 illustrates an example of a recording scenario in an electronic device having two
omnidirectional microphones pointing in the same direction. Referring to FIG. 4, a pair of
omnidirectional microphones 410 and 420 disposed in close proximity is shown.
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[0029]
Omnidirectional microphones 410 and 420 may correspond to the microphones of the mobile
device (e.g., microphones 210 and 220 of smartphone 200). Omni-directional microphones 410
and 420 may be spaced very close together for optimal stereo recording, so that the signals
received by these microphones from a single sound source (e.g. The difference may not be
sufficient stereo effect when subjected to normal processing. Thus, the signal may be processed
using a processor (eg, processor 310) that may be configured to incorporate processing that has
been modified to provide enhanced stereo recording.
[0030]
For example, as shown in FIG. 4, the microphones 410 and 420 capture voice, eg, a signal
corresponding to the sound S (t) originating from the sound source 400 located at a particular
point (P) in the space in front of the two microphones. May be. Because the system can be
additive, there is no restriction that the sound source 400 be a single sound source in the system.
Depending on the angle between point P and microphones 410 and 420, there is some difference
between the individual distances from point P to each microphone. This is illustrated in FIG. 4 as
the distances R_left and R_right. The difference between the distances R_left and R_right is the
appropriate difference between the delays D_left and D_right, and the gains G_left and G_right
for the signals received by the microphones 410 and 420 respectively. Slight differences may
occur. The two delays and the two gains may be completely determined as a function of the
distance R of the source, the spacing h between the microphones, and the viewing angle θ of the
source. G0 means the first gain at the position of the sound source. For example, gains (G_left
and G_right) and delays (D_left and D_right) may be determined based on the following equation:
[0031]
G=G0/R(1)
[0032]
D=R/V(2)
[0033]
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Where “R” corresponds to the actual distance from the source (ie, R corresponds to R_right
and R_left respectively for right and left microphones 410 and 420 respectively) and V is the
applied sound It is a propagation speed.
[0034]
Thus, the audio channels corresponding to the signals captured by the right and left microphones
410 and 420, respectively, may be expressed as:
[0035]
S_left (t) = G_left * S (t−D_left) (3)
[0036]
S_right (t) = G_right * S (t−D_right) (4)
[0037]
The processor (e.g., processor 310) may then apply the enhanced stereo recording process.
Processor 310 may use a small phase difference between microphones 410 and 420 to create a
noticeable gain difference between the two output signals, which may depend on the direction in
which the sound arrives.
In this way, the individual directions can be clearly recognized by the human ear during
playback.
Various enhancement processing strategies may be utilized.
For example, in the implementation shown in FIG. 4, the process of generating the gain difference
between the left and right channels (ie, signals 362 and 364) is such that each of the two
omnidirectional microphones is an unbalanced directional microphone May be performed.
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This may be implemented using the following equations for the left and right output channels.
[0038]
S_left (t) = G0 * M_left (t) -G1 * M_right (t-d) (5)
[0039]
S_right (t) = G0 * M_right (t) -G1 * M_left (t-d) (6)
[0040]
Where M_left (t) and M_right (t) are signals simultaneously taken by two microphones, and
constants G0, G1, and d are virtual sound sources coming from the right side (ie, θ = −90 °) It
may be related.
[0041]
For example, the delay d in this case depends only on the space h between the two microphones
and may be calculated in advance and used as a constant.
The values G0 and G1 are also constants and are calculated beforehand assuming a constant
"desired" distance h 'which is much larger than h (e.g. 100 cm).
In the illustrated use scenario, d may be determined as h / V (V is the speed of sound).
Thus, assuming h = 1 cm (assuming V is 343.2 m / s), d is approximately 29 us.
G0 may be set to 1 and G1 may be set to h '/ (h + h'). Thus, if h is 1 cm and h 'is set to 100 cm,
G1 will be about 0.99. When processing as described above, directivity effects may occur in each
channel (as shown in FIG. 4). For example, sources located on the opposite side of a channel are
completely attenuated while sources located on the side of the appropriate channel are amplified.
From the aspect of the channel recording gain, the actual effect of the adaptation process is
similar to the effect that would be achieved if the microphones were located apart from each
other to the "desired" distance h '(ie 100 cm) to be estimated. It may be
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[0042]
The processing described above can be performed in either the time domain or the spectral
domain. In the time domain, the delay value d is implemented by applying interpolation to the
extracted signal. This allows for sub-sample delay (e.g., at 8000 samples / s sampling rate, h = 1
cm requires a delay of about 0.25 samples). In the frequency domain, each bin of frequency ω in
the time frame is multiplied by Exp- (ω * T) to introduce a time delay T.
[0043]
One advantage of the process described above is that the output stereo channel pairs have
almost common delays. Zero delay stereo pairs can be easily converted to single audio channels
simply by summing the left and right channels. This is not possible with stereo channel pairs that
result in a noticeable delay between the two channels (e.g. the space between the microphones is
greater than 10 cm), and simply adding up usually results in constant frequency attenuation of
the audio signal. Another advantage of the process described above is that multiple sound
sources do not require separate processes. In other words, a single process can handle all sound
sources that occur simultaneously in the recorded scene. For example, common processing
results in the sound source from the left being enhanced gain in the left channel (and low gain in
the right channel) and the simultaneous second sound source from the right being enhanced gain
in the right channel.
[0044]
FIG. 5 is a flow chart illustrating an example process of enhanced stereo recording. With
reference to FIG. 5, it can be seen that the flowchart 500 comprises several example steps that
may be performed by an electronic system (e.g., the electronic device 300 of FIG. 3). Thereby,
enhanced stereo recording is facilitated using two omnidirectional microphones placed close to
and embedded in the electronic system and pointing in the same direction.
[0045]
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At start step 502, the electronic device (eg, electronic device 300) may be powered on and
initialized. This step includes powering on, activating and / or initializing various components of
the electronic device, such that the electronic device is ready to perform or execute a function or
supported application. It is also good.
[0046]
At step 504, the placement of the microphone of the electronic device may be evaluated, for
example, in particular for stereo recording. In this regard, certain microphone arrangements (e.g.,
two omnidirectional microphones placed in close proximity to one another) may degrade the
performance of stereo recording. Thus, evaluating the placement of the microphone may
comprise determining (or guessing) the performance of a stereo recording made using the
microphone. The estimated performance may be estimated with respect to the predicted quality
of the stereo effect of the audio content created based on the signal captured by the microphone.
[0047]
The results of the evaluation may be confirmed at step 506. In this regard, the verification
compares the evaluated performance against one or more predetermined thresholds that may be
related to (or calculated based on) the quality of the stereo effect of the predicted output speech
It may be provided. For example, the quality of the stereo effect may be expressed as a
percentage (100% corresponds to the ideal quality of the stereo effect), and the threshold is set
to a specific percentage (for example, 50%, 75%, 90%, etc.) Be done. Thus, a minimal "acceptable"
quality may be set, for example, to 90%, and only recordings with stereo effects having a quality
of less than 90% are considered to be degraded. It may be shown. However, in some
implementations, adaptive processing is always performed and dynamically adapted to ensure (or
try to achieve) ideal performance. In the case where it may be determined that the microphone
placement does not degrade stereo sound recording, the process may proceed to step 510.
Alternatively, the process may proceed to step 508 in cases where it may be determined that the
microphone placement may degrade stereo recording.
[0048]
At step 508, the signal processing may be adaptively configured (or modified) to enhance stereo
recording, eg, to simulate performance corresponding to spaced microphones and / or
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directional reception. For example, the processing of the input signal captured by the
microphone may be adaptively modified, for example, similar to the processing described above
with respect to FIG.
[0049]
At step 510, the input signal that the microphone captures (or generates) may be processed. The
resulting signals (corresponding to the left and right channels) provide the desired stereo effect
as a result of the adaptive processing performed based on the proper placement of the
microphones or if the placement of the microphones is not optimal. It is also good.
[0050]
In one implementation, the method for enhancing stereo recording may be used in a system that
may include an electronic device (eg, electronic device 300). The electronic device (e.g.,
electronic device 300) comprises one or more circuits (e.g., processor 310 and audio codec 320)
and a first microphone and a second microphone (e.g., microphones 3301 and 3302). It is also
good. The method evaluates the stereo recording performance of the electronic device using the
first and second microphones, and evaluates the processing of the signals generated by the first
and second microphones. It may comprise comprising based on. The arrangement comprises
adaptively modifying the process to match or approximate ideal performance to enhance stereo
recording performance. The method further comprises generating left and right channel signals
for output to the left and right ears of the listener, respectively, based on processing of the
signals generated by the first and second microphones. It is also good. The method may comprise
adaptively modifying the process if the assessed stereo recording performance falls below a
predetermined threshold. The method evaluates stereo recordings of the electronic device based
on the type of each of the first and second microphones and / or based on the distance between
the first and second microphones. It may be provided. The electronic device may comprise a
portable device. The method comprises: determining a distance between the first microphone and
the second microphone, a distance from the signal source captured by the first microphone and
the second microphone, an initial gain at the source position, and / or an audio propagation
velocity And adaptively modifying the process based on The method may comprise generating a
noticeable gain difference between the two output signals corresponding to the signals captured
by the first and second microphones, respectively, based on the adaptive modification of the
process. The method may comprise adaptively modifying the process to simulate directional
reception of signals by the first and second microphones when the microphones are
omnidirectional. Simulation of directional reception may result in amplification of the sound
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source located on the appropriate channel side.
Simulation of directional reception may result in the complete attenuation of the sound source
located on the opposite side of the channel.
[0051]
In one implementation, stereo recording may be enhanced with a system that may comprise an
electronic device (eg, electronic device 300). The electronic device (e.g., electronic device 300)
comprises one or more circuits (e.g., processor 310 and audio codec 320) and a first microphone
and a second microphone (e.g., microphones 3301 and 3302). It is also good. One or more
circuits may be operable to evaluate the stereo recording performance of the electronic device
using the first microphone and the second microphone, the first microphone and the second
microphone generating The processing of the signal may be configured to be processed based on
the evaluated stereo recording performance. The arrangement comprises adaptively modifying
the process to match or approximate ideal performance to enhance stereo recording
performance. The processing may further comprise generating left and right channel signals for
output to the left and right ears of the listener, respectively. The one or more circuits may be
operable to adaptively modify the process if the assessed stereo recording performance falls
below a predetermined threshold. One or more circuits evaluate stereophonic recordings of the
electronic device based on the type of each of the first and second microphones, and / or based
on the distance between the first and second microphones. May be operable to evaluate. The
electronic device may comprise a mobile device (e.g. a smart phone 200 or a camera 250). The
one or more circuits may include: a distance between the first microphone and the second
microphone, a distance from the signal source captured by the first microphone and the second
microphone, an initial gain at the signal source position, and / or It may be operable to adaptively
modify the process based on the speech velocity. One or more circuits are operable to adaptively
modify the process of producing a noticeable gain difference between the two output signals
corresponding to the signals captured by the first and second microphones, respectively. It is also
good. The one or more circuits are operable to adaptively modify the process to simulate
directional reception of signals by the first and second microphones when the microphones are
omnidirectional It is also good. Simulation of directional reception may result in amplification of
the sound source located on the appropriate channel side.
Simulation of directional reception may result in the complete attenuation of the sound source
located on the opposite side of the channel.
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[0052]
Another implementation is a non-transitory computer readable medium and / or a storage
medium, and / or a non-transitory machine readable medium and / or a storage medium stored
thereon, at least one code executable by the machine and / or the computer A machine code and
/ or computer program having a section may be provided, thereby causing the machine and / or
computer to perform the steps described herein for enhanced stereo recording in a portable
device.
[0053]
Thus, the method and / or system may be implemented in hardware, software, or a combination
of hardware and software.
The method and / or system may be implemented in a centralized fashion in at least one
computer system, or in a distributed fashion spanning multiple computer systems with different
elements interconnected. Any type of computer system or other system adapted to carry out the
method described herein above is suitable. The general hardware and software combination may
be a general purpose computer system with a computer program, which when installed and
executed controls the computer system to perform the methods described herein. Do. Another
common implementation may comprise an application specific integrated circuit or chip.
[0054]
The method and / or system may be incorporated into a computer program product. The
computer program product comprises all the features that allow the implementation of the
methods described herein above and is capable of performing these methods when installed on a
computer. A computer program in the present context means any representation, code or
representation in any language of a set of instructions intended to cause a system with
information processing capability to carry out a particular function. The implementation of this
particular function may be performed directly or after one or both of a) conversion to another
language, code or notation, b) replication in different material forms. Thus, some
implementations may comprise non-transitory machine-readable (eg, computer readable) media
(eg, FLASH drives, optical disks, magnetic storage disks, etc.) and one or more machineexecutable code The number of lines is stored on the medium, thereby causing the machine to
perform the processing described herein.
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[0055]
Although the method and / or system has been described with respect to certain
implementations, various modifications may be made by those skilled in the art without
departing from the scope of the method and / or system, and equivalents may be substituted. It is
understood that it may. In addition, many modifications may be made to adapt a particular
situation or material to the teachings of the present disclosure without departing from its scope.
Thus, the methods and / or systems are not limited to the specific implementations disclosed, but
the methods and / or systems include all implementations that fall within the scope of the
appended claims.
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19
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