WO2011079716A1 - 一种使用麦克风阵列的降噪控制方法和装置 - Google Patents
一种使用麦克风阵列的降噪控制方法和装置 Download PDFInfo
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- WO2011079716A1 WO2011079716A1 PCT/CN2010/079814 CN2010079814W WO2011079716A1 WO 2011079716 A1 WO2011079716 A1 WO 2011079716A1 CN 2010079814 W CN2010079814 W CN 2010079814W WO 2011079716 A1 WO2011079716 A1 WO 2011079716A1
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- signal
- microphone array
- adaptive filter
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02166—Microphone arrays; Beamforming
Definitions
- the present invention relates to the field of microphone array adaptive noise reduction control technology, and in particular to a microphone array noise reduction control method and apparatus. Background technique
- Wireless mobile communication technologies and devices have been widely used in people's ordinary life and work, which has relieved the time and space constraints of people's communication and provided great convenience for people.
- the communication environment will be complex and varied, including noisy environments, where noise will make the voice quality of the call seriously degraded. Therefore, the voice enhancement technology that suppresses noise has a modern communication. Important application.
- Patent Document 3 provides another better microphone array speech enhancement technique composed of two or more microphones, and the noise received by one microphone through the adaptive filter cancels the noise component in the signal received by the other microphone. Keep the voice component. Since the signals received by the two microphones in practice have speech components, the noise reduction will also damage the speech. Therefore, a key difficulty of this technology is how to control the convergence and filtering of the adaptive filter to ensure effective noise suppression. At the same time, the voice in one microphone is protected from being cancelled by the voice in the other microphone.
- the microphone array has a pointing by designing a specific microphone position.
- the directional microphone is directly used, so that the energy responses from signals in different directions are different, so the direction of the signal is judged by comparing the energy differences, thereby controlling the elimination of noise.
- this method first has strict requirements on the microphone, such as the consistency requirement of the microphone, or the directional microphone needs to be strictly designed to have obvious directivity, which has a large limitation; secondly, this method cannot accurately judge in the case of large noise.
- the noise reduction of the adaptive filter cannot be accurately controlled, so that the noise is damaged while the noise is reduced.
- Patent Document 1 Chinese Invention Patent Notice No. CN1684143
- Patent Document 2 Chinese Invention Patent Announcement No. CN101477800
- Patent Document 3 Chinese Invention Patent Announcement No. CN101466055
- Patent Document 4 Chinese Invention Patent Publication No. CN101466056
- the problem to be solved by the present invention is how to accurately determine the voice state by using a microphone array composed of two or more microphones, thereby effectively controlling the adaptive filter to eliminate noise and improve the signal to noise ratio. At the same time, it is very good at protecting voice quality.
- the present invention provides a microphone array adaptive noise reduction control method, which includes the following steps:
- the step of determining the incident angle of the sound includes:
- S202 Calculate a phase difference of each frequency sub-band of the microphone array signal, and calculate a relative delay of each frequency sub-band of the microphone array signal by the phase difference;
- step S203 Calculate an incident angle of the microphone array signal according to a relative delay of each frequency subband.
- step S4 when there is only noise, the adaptive filter is quickly updated; when the target signal is present, the adaptive filter is slowly updated.
- the update speed of the adaptive filter is controlled by the control parameter ⁇ , wherein the value of ⁇ is determined by the ratio of the noise component in the statistical result; the smaller the ⁇ , the slower the adaptive filter update; when ⁇ is 0
- the sound signals are all target speech signals, and the adaptive filter is not updated; conversely, when ⁇ is 1, the sound signals are all noise signals, and the adaptive filter is updated at the fastest speed.
- the method further includes: setting an angular transition range, dividing the entire space into a plurality of regions according to the number of the target speech signals, calculating a parameter ⁇ according to the region where the incident angle is located, and calculating ⁇ * ⁇ As a control parameter of the adaptive filter.
- the step of performing frequency domain transformation on the sound signal further includes:
- S2013 DFT converts the data after the window into the frequency domain.
- the present invention further provides a microphone array noise reduction control apparatus, including: a microphone array for collecting a sound signal; and a filtering control unit configured to determine an incident angle of all sound signals of the microphone array, and perform a signal according to the incident angle The statistics of the components are then controlled based on the statistical results of the signal components to control the adaptive filter and the wave filter; the adaptive filter is used to filter out noise.
- a microphone array noise reduction control apparatus including: a microphone array for collecting a sound signal; and a filtering control unit configured to determine an incident angle of all sound signals of the microphone array, and perform a signal according to the incident angle The statistics of the components are then controlled based on the statistical results of the signal components to control the adaptive filter and the wave filter; the adaptive filter is used to filter out noise.
- the filtering control unit includes: a DFT unit for performing a discrete Fourier transform on the sound signal to the frequency domain; and a signal delay estimating unit for calculating a phase difference of each frequency subband of the microphone array signal, and the phase difference is Calculating a relative delay of each frequency subband of the microphone array signal; a signal direction estimating unit, configured to calculate an incident angle of the microphone array signal according to a relative delay of each frequency subband; a signal component statistical unit, configured to be used according to the incident The angle is used to calculate the target signal component, and the target signal component and the noise component are distinguished.
- the DFT unit includes: a framing unit; configured to perform framing processing on the sound signal; a window unit, configured to window-process each frame of the framed signal; and a DFT conversion unit configured to perform DFT conversion on the windowed data to the frequency domain.
- the microphone array in the technical solution provided by the present invention is composed entirely of omnidirectional microphones or consists of omnidirectional microphones and unidirectional microphones or all of them are unidirectional microphones.
- the spatial orientation information of the sound is directly obtained by using the microphone array, and the orientation information is utilized to more accurately control the update filtering of the adaptive filter, thereby effectively reducing noise and protecting the voice well.
- this technology does not require the energy information of the signal, and does not have strict requirements on the consistency of the two microphones, nor is it affected by the energy change.
- FIG. 1 is a schematic diagram showing the position of two microphone arrays according to an embodiment of the present invention
- FIG. 2 is a schematic diagram showing a simple principle of a dual microphone implementation provided by the present invention
- FIG. 3 is a schematic diagram of a single microphone array implementation of the present invention
- FIG. 4 is a schematic diagram of a dual microphone time domain adaptive filter noise reduction implementation scheme provided by the present invention
- FIG. 5 is a schematic diagram of a dual microphone frequency domain (subband) adaptive filter noise reduction implementation scheme provided by the present invention.
- FIG. 6a is a waveform diagram of a noisy speech signal before denoising processing according to an embodiment of the present invention
- FIG. 6b is a waveform diagram of a speech signal after denoising processing according to an embodiment of the present invention
- FIG. 7 is a waveform diagram of the present invention. A schematic diagram of the position of a two microphone array;
- Figure 8 is a schematic illustration of the position of two microphone arrays suitable for use in a dual microphone headset provided by the present invention. detailed description
- an acoustic signal collected by two microphones and an adaptive filter are used for noise reduction processing, wherein two microphones are used.
- the collected acoustic signals are respectively used as the noisy speech signal S1 and the reference signal 3 ⁇ 4.
- the reference signal S 2 is input to the adaptive filter for filtering, the output signal noise signal S 3 , the noisy speech signal ⁇ 1 signal minus s 3 is obtained to obtain the signal y, and y is fed back to the adaptive filter to update the filter weight.
- the adaptive filter When the y energy is large, the adaptive filter is quickly updated so that s 3 keeps close to Sl , and then the y energy obtained by subtracting Si and s 3 is continuously smaller; at that time, the y energy is the smallest, and the adaptive filter stops updating, thereby The effect of using the s 2 system 81 is achieved.
- the present invention provides a method of controlling adaptive filter updating and filtering using a sound incident direction, which enables the adaptive filter to not impair speech when speech occurs.
- FIG. 2 is a schematic diagram of a simple principle of a dual microphone voice enhancement control implementation provided by the present invention.
- two omnidirectional microphones mic_a, mic_b were collected into acoustic signals Sl, s 2.
- the sound signal S1 is used as a desired voice signal, and the sound signal s 2 is treated as a reference signal.
- the sound signal S1 , s 2 is processed by a filter control unit to obtain a control parameter ot; then the adaptive filter H adjusts the update speed according to the control parameter ⁇ , and calculates the noise signal s 3 ; the desired voice signal S1 minus the noise signal s 3 obtains the noise-reduced speech signal y, and y feeds back to the adaptive filter to update the filter weights, so that the energy of the noise in y is minimized, and the speech energy is unchanged, thereby achieving protection of the speech while suppressing noise. effect.
- FIG. 3 is a simple implementation of a microphone array composed of a plurality of microphones provided by the present invention. Schematic diagram. As shown in FIG. 3, n+1 omnidirectional microphones mic_a, mic_bl mic_bn form a microphone array, and in the process of performing noise reduction processing in this embodiment, the sound signal is collected by the microphone mic_a as a desired The speech signal S1 is processed by mic_bl whil mic-bn to obtain a sound signal as a reference signal.
- the microphone array implementation provided in FIG. 3 is different from the dual microphone implementation of FIG. 2 in that there are n microphones (mic_b1...mic_bn) providing reference signals in the microphone array, adaptive filters.
- the control module processes the sound signals collected by the n microphones and the sound signals collected by the mic—a, and obtains n control parameters ⁇ , ⁇ (HI ...... Hn ) adaptive filters.
- y is fed back to the adaptive filter to update the filter weights, so that the energy of the noise in y is minimized, and the speech energy is unchanged, thereby achieving the effect of suppressing noise-protected speech.
- the adaptive filter may be a time domain adaptive filter or a frequency domain adaptive filter.
- the noise reduction implementation of the present invention will be described in detail below by taking the time domain adaptive filter and the frequency domain adaptive filter as examples.
- FIG. 4 is a schematic diagram of the principle of a dual microphone time domain adaptive filter noise reduction implementation provided by the present invention.
- the signal is then processed by the filter control unit, and the control parameter ⁇ is output to the adaptive filter.
- the adaptive filter constrains its weight according to the control parameter ⁇ to update and filter the corresponding speed, and outputs the noise signal s 3 ; and the noise signal s 3 and the noise in the desired speech signal 81 are eliminated.
- the final noise-reduced speech signal y The final noise-reduced speech signal y.
- the filtering control unit comprises a DFT unit, a signal delay estimating unit, a signal direction estimating unit and a signal component statistical unit, and the DFT unit separately performs discrete Fourier transform to the frequency domain; and converts the signal into the frequency domain to the signal input
- the microphone signal delay estimating unit calculates the phase difference of each frequency subband of the two signals, and then calculates the relative delay of each frequency subband of the two signals according to the phase difference; setting the target speech from the 0 degree direction, and the signal direction estimating unit Two-way signal for each frequency sub-band
- the relative delays are converted into their incident angles, and the target speech components within the guard angle and the noise components outside the guard angle can be distinguished according to the incident angle; the signal component statistical unit counts the components of the target speech signal whose incident angle is within the guard angle, and
- the control parameter ⁇ (0 ⁇ ⁇ ⁇ 1 ) is calculated.
- the more noise components outside the protection angle, the larger the control parameter ⁇ is, the faster the adaptive filter is updated; when the received signals are all noise components outside the guard angle, ⁇ 1, adaptive filter The fastest update in the noise segment suppresses the noise signal.
- the speech that stops updating in the speech segment to protect the desired speech signal is not erased by 4, so that the good protection target speech is not damaged.
- noise speech signal y is fed back to the time domain adaptive filter H, when y energy, quickly update the adaptive filter, so that the continued proximity Sl s 3, and s 3 and Sl obtained with Save The y energy is getting smaller and smaller.
- the frame length N 256, that is, 32 ms
- the aliasing M 128, that is, 50% aliasing.
- Window function can choose Hanming window, Hanning window and other window functions, this implementation
- the windowed data is finally DFT converted to the frequency domain.
- o ⁇ it ⁇ is the frequency subband
- G is the frequency subband
- (») is the amplitude
- (" is the phase.
- Signal delay estimation unit Calculate the relative delay of the two signals
- the angle of incidence of the signal can be known by comparing the relative delay of the signal ⁇ ( « ) with the delay of the protection angle ⁇ 45° ⁇ ( ⁇ 45°):
- the control parameter ⁇ of the adaptive filter is obtained according to the ⁇ ( « ) statistic in the protection angle.
- the adaptive filter input signal is s 2 (n), and the filtered output signal is s 3 (n):
- s 3 (n) w( )*s 2 (n) + w(l)*s 2 (nl) + ... + w(Pl)*s 2 (nP + l)
- the adaptive filter stops updating, so that the adaptive filter and the output signal s 3 (n) of the filter do not converge to ⁇ ( ⁇ ), s 3 (n) is different from s ⁇ n), so that the subtracted speech components are not cancelled, and the output y(n) retains the speech component.
- 0 ⁇ 1 That is, the signal collected by the microphone has both a speech component and a noise component.
- the adaptive filter update speed is controlled by the number of speech components and noise components to ensure that the speech component is preserved while eliminating noise.
- FIG. 6a and FIG. 6b respectively show waveform diagrams of the noisy speech signal and the denoised speech signal before and after the noise reduction processing of the above-described embodiment provided by the present invention.
- FIG. 6a and FIG. 6b wherein the target voice is from the 0° direction and the music noise is from 90°
- FIG. 6a is the original noisy speech signal S1 waveform collected by the microphone mic_a
- FIG. 6b is after the noise reduction process of the present invention.
- Signal y waveform It can be seen that the technical solution for reducing noise by using the incident angle of sound provided by the present invention can better protect the target speech while eliminating the noise in the target speech, and has a good noise reduction effect.
- ⁇ * ⁇ is a control parameter as an adaptive filter. This makes the control parameters of the adaptive filter more precise, thereby enhancing the noise reduction effect of the speech.
- control parameter ⁇ is used to control the time domain adaptive filter for noise reduction, but it is not limited to the time domain adaptive filter.
- the control parameter ⁇ can also be used to control the frequency domain (subband) adaptive filter for noise reduction.
- the difference between the time domain and the frequency domain is:
- the signal component statistical unit of the time domain obtains a control parameter ⁇ by counting the number or proportion of the target signal; the statistical component of the signal component of the frequency domain is obtained by counting the incident angle of each frequency subband.
- the control parameter ⁇ of the frequency subbands The difference between the time domain and the frequency domain is:
- the signal component statistical unit of the time domain obtains a control parameter ⁇ by counting the number or proportion of the target signal; the statistical component of the signal component of the frequency domain is obtained by counting the incident angle of each frequency subband.
- the DFT unit collects two omnidirectional microphones mic_a and mic_b.
- the signal s 2 is transformed into the frequency domain, and the signal converted to the frequency domain is input to the microphone signal delay estimating unit to calculate the relative delay of each frequency sub-band of the two signals; the signal direction estimating unit takes each frequency sub-band signal The relative delay is converted into the incident angle of each frequency sub-band signal; the signal component statistical unit counts the position of the incident angle of each frequency sub-band within the guard angle, and calculates the corresponding control parameter ⁇ ,. Indicates the frequency subband).
- the frequency domain (subband) adaptive filter 4 performs update control on each frequency subband after the signal component statistics according to the characteristics of the frequency subband.
- the incident angle of each frequency sub-band is converted into the control parameter ⁇ of the adaptive filter, (representing the frequency sub-band).
- the i'th frequency subband incident angle is ⁇ in the 0 degree direction of the guard angle.
- the control parameters of each frequency subband can be further obtained and the update of each frequency subband of the frequency adaptive filter can be independently controlled, and the noise reduction effect is more prominent.
- the transition region may be further increased to obtain the parameter ⁇ ( 0 ⁇ ⁇ ⁇ 1 ), and new control parameters ⁇ , * ⁇ are generated.
- ⁇ , ⁇ * ⁇ as the control parameter of the adaptive filter can also make the control parameters of the adaptive filter more precise, thus enhancing the noise reduction effect of the speech.
- the closer to the suppression region ⁇ , the larger, ⁇ ,. 1 in the inhibition region.
- the protection range selected by the above embodiment is -45° ⁇ 45°, but in practice, it can be adjusted according to the actual position and needs of the user.
- the relative position of the two microphones to the user is not limited to the position shown in FIG. 1, and may be any position, as long as there is no obstacle between the microphone and the human mouth or the target sound source to block the sound signal transmission, as shown in FIG.
- the consistency of the two microphones is not strictly required; and the microphone signal is not affected by the change of the sound signal energy. There is no strict requirement for directivity.
- the present invention is easier to implement in the implementation process than the existing microphone noise reduction technology.
- the omnidirectional microphone is used to form the microphone array
- the omnidirectional microphone and the unidirectional microphone may be used to form the microphone array
- all of the unidirectional microphones may be used to form the microphone array.
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/499,948 US8942976B2 (en) | 2009-12-28 | 2010-12-15 | Method and device for noise reduction control using microphone array |
| JP2012540279A JP5542952B2 (ja) | 2009-12-28 | 2010-12-15 | マイクロホンアレイノイズ低減制御方法及び装置 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910265426.9 | 2009-12-28 | ||
| CN200910265426.9A CN102111697B (zh) | 2009-12-28 | 2009-12-28 | 一种麦克风阵列降噪控制方法及装置 |
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| Publication Number | Publication Date |
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| WO2011079716A1 true WO2011079716A1 (zh) | 2011-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/CN2010/079814 Ceased WO2011079716A1 (zh) | 2009-12-28 | 2010-12-15 | 一种使用麦克风阵列的降噪控制方法和装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8942976B2 (zh) |
| JP (1) | JP5542952B2 (zh) |
| CN (1) | CN102111697B (zh) |
| WO (1) | WO2011079716A1 (zh) |
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Also Published As
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| JP2013511750A (ja) | 2013-04-04 |
| JP5542952B2 (ja) | 2014-07-09 |
| US20120197638A1 (en) | 2012-08-02 |
| US8942976B2 (en) | 2015-01-27 |
| CN102111697B (zh) | 2015-03-25 |
| CN102111697A (zh) | 2011-06-29 |
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