WO2006046293A1 - 雑音抑圧装置 - Google Patents
雑音抑圧装置 Download PDFInfo
- Publication number
- WO2006046293A1 WO2006046293A1 PCT/JP2004/016027 JP2004016027W WO2006046293A1 WO 2006046293 A1 WO2006046293 A1 WO 2006046293A1 JP 2004016027 W JP2004016027 W JP 2004016027W WO 2006046293 A1 WO2006046293 A1 WO 2006046293A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- noise
- amplitude component
- band
- amplitude
- noise suppression
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
Definitions
- the present invention relates to a noise suppression device, and more particularly to a noise suppression device that reduces a noise component from a speech signal on which noise is superimposed.
- Non-Patent Document 1 and Patent Document 1 In mobile phone systems and IP (Internet Protocol) phone systems, environmental noise is input to the microphone in addition to the voice of the speaker. As a result, the audio signal is degraded and the clarity of the audio is impaired. In view of this, techniques have been developed in the past to reduce noise components from degraded speech signals and improve call quality (see, for example, Non-Patent Document 1 and Patent Document 1).
- FIG. 1 shows a block diagram of an example of a conventional noise suppression device.
- the time-frequency converter 10 converts the input signal X (k) of the current frame n into the frequency domain f over the time domain k for each unit time (frame), and the frequency domain signal of the input signal Find X (f).
- the amplitude calculation unit 11 obtains an amplitude component I X (f) I (hereinafter referred to as “input amplitude component”) of the input signal from the frequency domain signal X (f).
- Noise estimator 12 is the input amplitude component when there is no speaker's voice
- the amplitude component (f) of the estimated noise (hereinafter referred to as “estimated noise amplitude component”) is obtained.
- the suppression coefficient calculation unit 13 calculates a suppression coefficient G (f) from I X (f) I and z (f) according to the equation (1).
- the noise suppression unit 14 obtains an amplitude component S (f) after noise suppression from X (f) and G (f) according to Equation (2). [0006] [Equation 2]
- the time-frequency converter 15 converts S * n (f) from the frequency domain to the time domain, and obtains the signal s * (k) after noise suppression.
- Non-Patent Document 1 SF Boll, "Supression of Acoustic Noise in Speech Using Spectral Subtraction", IEEE Transaction on Acoustics, Speech, and Signal Processing, ASSP— 33, vol. 27, pp. 113—120, 1979
- the estimated noise amplitude component (f) is obtained, for example, by averaging the amplitude components of the input signal in a frame that does not include the speech of the past speaker.
- the average (long-term) tendency of background noise is estimated based on past input amplitude components.
- FIG. 2 shows a principle diagram of an example of a conventional suppression coefficient calculation method.
- the suppression coefficient calculation unit 16 calculates a suppression coefficient G (f) based on the amplitude component IX (f) I of the current frame n and the estimated noise amplitude component (f), and uses this suppression coefficient as the input amplitude component.
- the noise component contained in the input signal is suppressed by multiplying by.
- noise estimation error an estimation error (hereinafter referred to as noise estimation error) occurs between the noise amplitude component superimposed on the current frame and the estimated noise amplitude component. Therefore, as shown in Fig. 3, the noise estimation error, which is the difference between the noise amplitude component indicated by the solid line and the estimated noise amplitude component indicated by the broken line, becomes large.
- the noise estimation error described above causes over-suppression or under-suppression in the noise suppression device.
- the noise estimation error fluctuates greatly from frame to frame. Insufficient pressure also fluctuates, resulting in temporal unevenness in noise suppression performance. This temporal variation in noise suppression performance produces an unusual noise known as musical noise.
- FIG. 4 shows a principle diagram of another example of a conventional suppression coefficient calculation method.
- This is an averaged noise suppression technology that aims to suppress abnormal noise that occurs due to over-suppression or under-suppression in noise suppression devices.
- the amplitude smoothing unit 17 smoothes the amplitude component IX (f) I of the current frame n
- the suppression coefficient calculation unit 18 calculates the amplitude component P (f) (hereinafter referred to as the smoothed input signal).
- the “smoothed amplitude component”) and the estimated noise amplitude component (f) the suppression coefficient G (f) is obtained.
- the average value of the input amplitude components for the current frame and the past several frames is defined as the smoothed amplitude component P (f).
- This method is a simple averaging method, and the smooth ⁇ amplitude component can be obtained from Eq. (3).
- the smoothed amplitude component P (f) is an n n-1 weighted average value of the amplitude component I X (f) I of the current frame and the smoothed amplitude component P (f) of the previous frame. This is called exponential smoothing, and the smoothed amplitude component can be obtained from Eq. (4).
- the suppression coefficient is obtained based on the smooth noise amplitude component having a large speech estimation error and the estimated noise amplitude, and the input amplitude component is multiplied by the suppression coefficient, the voice component included in the input signal is erroneously detected. There was a problem that the sound quality was deteriorated. This phenomenon is particularly noticeable at the beginning of speech (the beginning of speech).
- the present invention has been made in view of the above points, and provides a noise suppression device that realizes stable noise suppression performance while suppressing the occurrence of musical noise and minimizing the influence on speech. This is the general purpose.
- the present invention provides an amplitude calculation means for obtaining an amplitude component of an input signal for each band, and an estimated noise amplitude component for each band by estimating an amplitude component of noise of the input signal.
- Noise estimation means for generating a different weighting factor for each band, and a smoothing amplitude component for each band by smoothing the amplitude component of the input signal in time using a different weighting factor for each band Amplitude smoothing means to be obtained, and the smoothed amplitude component.
- a suppression amount calculation means for obtaining a suppression coefficient for each band from the estimated noise amplitude component and a noise suppression means for obtaining and outputting a speech signal in which noise is suppressed from the input signal and the suppression coefficient for each band.
- noise suppression device According to such a noise suppression device, it is possible to achieve stable noise suppression performance by minimizing the influence on speech while suppressing the generation of musical noise.
- FIG. 1 is a block diagram of an example of a conventional noise suppression device.
- FIG. 2 is a principle diagram of an example of a conventional suppression coefficient calculation method.
- FIG. 3 is a diagram for explaining a conventional noise estimation error.
- FIG. 5 is a diagram for explaining a conventional noise estimation error.
- FIG. 6 is a diagram for explaining a conventional speech estimation error.
- FIG. 7 is a principle diagram for calculating a suppression coefficient in the present invention.
- FIG. 8 is a principle diagram for calculating a suppression coefficient in the present invention.
- FIG. 9 is a configuration diagram of an amplitude smoothing unit when an FIR filter is used.
- FIG. 10 is a configuration diagram of an amplitude smoothing unit when an IIR filter is used.
- FIG. 11 is a diagram showing an example of a weighting coefficient in the present invention.
- FIG. 12 is a diagram showing a relational expression for obtaining a suppression coefficient from a smoothed amplitude component and an estimated noise amplitude component.
- FIG. 13 is a diagram for explaining a noise estimation error of the present invention.
- FIG. 14 is a diagram for explaining speech estimation errors according to the present invention.
- FIG. 15 is a waveform diagram of an audio input signal on which noise is superimposed.
- FIG. 16 is a waveform diagram of an output audio signal of a conventional noise suppression device.
- FIG. 17 is a waveform diagram of an output audio signal of the noise suppression device of the present invention.
- FIG. 18 is a block diagram of a first embodiment of a noise suppression device of the present invention.
- FIG. 19 is a block diagram of a second embodiment of the noise suppression apparatus of the present invention.
- FIG. 20 is a block diagram of a third embodiment of the noise suppression apparatus of the present invention.
- FIG. 21 is a diagram showing a nonlinear function func.
- FIG. 22 is a block diagram of a fourth embodiment of the noise suppression device of the present invention.
- FIG. 26 is a block diagram of another embodiment of a mobile phone to which the device of the present invention is applied.
- FIG. 7 and FIG. 8 show the principle diagrams of the calculation of the suppression coefficient in the present invention.
- the input amplitude component is smoothed before the suppression coefficient is calculated.
- the smooth w ⁇ amplitude component P ⁇ is obtained using the number w (f).
- the suppression coefficient calculation unit 22 performs smooth vibration mn
- the suppression coefficient G (f) is obtained based on the width component P (f) and the estimated noise amplitude component (f).
- the weighting factor calculation unit 23 calculates a feature amount (signal-to-noise ratio, input signal amplitude, etc.) from the input amplitude component, and adaptively calculates the weighting factor w (f) based on the feature amount.
- the amplitude smoothing unit 21 uses the amplitude component I X (f) I of the current frame n and the weighting factor w (f) from the weighting factor calculation unit 23 to obtain a smoothing amplitude component P (f).
- Suppression coefficient calculator 22 uses the amplitude component I X (f) I of the current frame n and the weighting factor w (f) from the weighting factor calculation unit 23 to obtain a smoothing amplitude component P (f).
- a smoothing method there are a method using an FIR filter and a method using an IIR filter.
- a smoothing method for deviation may be selected.
- FIG. 9 shows the configuration of the amplitude smoothing unit 21 when the FIR filter is used.
- the amplitude holding unit 25 holds input amplitude components (amplitude components before smoothing) for the past N frames.
- the smoothing unit 26 obtains the amplitude component after smoothing from the amplitude component before smoothing for the past N frames and the current amplitude component according to Equation (5).
- Figure 10 shows the configuration of the amplitude smoothing unit when an IIR filter is used.
- the amplitude holding unit 27 holds the amplitude components after smoothing for the past N frames.
- the smoothing unit 28 obtains the amplitude component after smoothing from the amplitude component after smoothing for the past N frames and the current amplitude component according to the equation (6).
- Equation 6 In the above equations (5) and (6), m is the number of delay elements constituting the filter, and w (f) —
- 0 w (f) is a weighting factor for each of the m + 1 multipliers that make up the filter.
- FIG. 11 shows an example of the weighting factor w (f) in the present invention.
- Figure 11 shows the nature of the input signal.
- the smoothing coefficient ex as a weighting coefficient is a constant, but in the present invention, the weighting coefficient calculation unit 23 shown in FIG.
- the input amplitude component calculates the feature quantity, such as the force signal-to-noise ratio and the amplitude of the input signal, and adaptively controls the weight coefficient based on the feature quantity.
- any expression can be selected.
- the relational expression shown in Fig. 12 may be applied as well as using the expression (1).
- G (f) decreases as P ( ⁇ ) / ⁇ (f) decreases.
- the input amplitude component is smoothed before calculating the suppression coefficient. Therefore, when the speaker's voice is not input, as shown in FIG.
- the noise estimation error which is the difference between the amplitude component and the estimated noise amplitude component indicated by the broken line, can be reduced.
- the voice estimation is the difference between the amplitude component of the voice signal indicated by the broken line and the smoothed amplitude component indicated by the solid line.
- the error can be reduced.
- stable noise suppression performance can be realized while minimizing the impact on speech and suppressing the generation of musical noise.
- the output speech signal of the conventional noise suppression apparatus using the suppression coefficient calculation method of FIG. 4 is shown in FIG.
- the output audio signal of the noise suppression device of the present invention has the waveform shown in FIG.
- Suppression performance (measured in a non-speech interval) at the time of noise input is about 14 dB for the conventional noise suppression device and about 14 dB for the noise suppression device of the present invention.
- the sound quality degradation during speech input (measured at the beginning of speech) is approximately 4 dB compared to the conventional noise suppressor, but the noise suppressor of the present invention is approximately ldB, which is improved by approximately 3 dB.
- the present invention makes it possible to reduce the suppression of the sound component during the sound input and to reduce the sound quality deterioration.
- FIG. 18 shows a block diagram of the first embodiment of the noise suppression apparatus of the present invention.
- This embodiment uses FFT (Fast Fourier Transform) / IFFT (Inverse F FT) for channel division 'synthesis, adopts a smoothing method using FIR filter, and adopts equation (1) to calculate the suppression coefficient. is doing.
- FFT Fast Fourier Transform
- IFFT Inverse F FT
- the FFT unit 30 converts the input signal X (k) of the current frame n into the frequency domain f from the time domain k and the frequency domain signal of the input signal. Find X (f). Note that the subscript n represents a frame number.
- the amplitude calculation unit 31 obtains an input amplitude component IX (f) I from the frequency domain signal X (f).
- the noise estimator 32 detects a speech section, and obtains an estimated noise amplitude component; z (f) from the input amplitude component IX (f) I according to Equation (7) when no speaker speech is detected. [0042] [Equation 7]
- the amplitude smoothing unit 33 holds the input amplitude component
- the averaged amplitude component P (f) is obtained from the only coefficient w (f) according to Eq. (8).
- f is the sampling frequency when digitalizing m n S audio.
- the weighting factor w (f) is shown in Fig. 11.
- the suppression coefficient calculation unit 36 obtains the suppression coefficient G (f) according to the equation (9) from the averaged amplitude component P (f) and the estimated noise amplitude component; z (f).
- the noise suppression unit 37 obtains an amplitude component s * n (f) after noise suppression from X n (f) and G n (f) according to equation (10).
- the IFFT unit 37 converts the amplitude component (f) into the frequency domain force time domain, and obtains the signal s * (k) after noise suppression.
- FIG. 19 shows a block diagram of a second embodiment of the noise suppression apparatus of the present invention.
- a band-pass filter is used for channel division and synthesis, a smoothing method using an FIR filter is employed, and the suppression coefficient is calculated using equation (1).
- the channel divider 40 uses a bandpass filter (BPF) to convert the input signal x (k) to (BPF)
- the amplitude calculation unit 41 uses the band signal X (i, k) force according to equation (12) in each frame.
- the noise estimator 42 detects the speech section and detects the amplitude component (i, n) of the estimated noise according to Eq. (13) from the input amplitude component Pow (i, n) for each band when no speaker speech is detected. Ask for.
- the total sum of the weighting factors for each channel is 1.
- the amplitude smoothing unit 43 receives the band-specific input amplitude components Pow (i, n-1), Pow (i, n-2) held in the amplitude holding unit 44, and the amplitude calculation unit 41
- the smoothed input amplitude component Pow (i, n) is calculated from the band-specific input amplitude component Pow (i, n) and the weighting coefficient w (i, m) according to Eq. (14).
- the m-0 suppression coefficient calculation unit 46 calculates the smoothed input amplitude component Pow (i, n) and the estimated noise amplitude component; z
- the suppression coefficient G (i, n) is calculated from (i, n) using equation (15).
- the band signal X (i, k) and the suppression coefficient G (i, n) are converted into Eq. (16).
- the channel synthesizer 48 consists of an adder circuit and is a band signal s * (i, k) Into equation (17)
- the output audio signal s * (k) is obtained by addition synthesis.
- FIG. 20 shows a block diagram of a third embodiment of the noise suppression apparatus of the present invention.
- FFTZIFFT is used for channel division and composition
- a smoothing method using an IIR filter is employed
- a nonlinear function is employed for calculating a suppression coefficient.
- the FFT unit 30 converts the input signal x (k) of the current frame n into the frequency domain f over the time domain k for each unit time (frame), and the frequency domain signal of the input signal Find X (f). Note that the subscript n represents a frame number.
- the amplitude calculation unit 31 obtains an input amplitude component I X (f) I from the frequency domain signal X (f).
- the noise estimator 32 detects the voice interval and detects the input amplitude component I X (f).
- the amplitude smoothing unit 51 includes the input amplitude component IX (f) I, the average amplitude components P (f) and P (f) of the past two frames held in the amplitude holding unit 52, and the weighting factor. Hold by holding part 53
- the averaged amplitude component P (f) is obtained from the weighting factor w (f) according to Eq. (18).
- the total sum of the weighting factors for each band is l.
- the suppression coefficient calculation unit 54 obtains the suppression coefficient G (f) from the averaged amplitude component P n (f) and the estimated noise amplitude component) using the nonlinear function func shown in the equation (19).
- Figure 21 shows the nonlinear function fu nc.
- the noise suppression unit 37 obtains an amplitude component S * (f) after noise suppression from X (f) and G (f) according to equation (10).
- the IFFT unit 37 converts the amplitude component (f) into the frequency domain force and also calculates the signal s * (k) after noise suppression.
- the weighting coefficient is controlled based on the amplitude component after smoothing, thereby making it undefined. Robust and stable control is possible against ordinary noise.
- FIG. 22 shows a block diagram of a fourth embodiment of the noise suppression apparatus of the present invention.
- FFTZIFFT is used for channel division and composition
- a smoothing method using an FIR filter is used
- a nonlinear function is used to calculate the suppression coefficient.
- the FFT unit 30 converts the input signal X (k) of the current frame n into the frequency domain f from the time domain k and the frequency domain signal of the input signal. Find X (f). Note that the subscript n represents a frame number.
- the amplitude calculation unit 31 obtains an input amplitude component I X (f) I from the frequency domain signal X (f).
- the noise estimation unit 32 detects a speech section, and obtains an estimated noise amplitude component z (f) from the input amplitude component I X (f) I according to the equation (7) when no speaker speech is detected.
- the signal-to-noise ratio calculation unit 56 calculates the signal-to-noise ratio SNR (for each band from the input amplitude component IX (f) I of the current frame and the estimated noise amplitude component (f) according to equation (20). Find f).
- the weighting factor calculation unit 57 obtains a weighting factor w (f) from the signal-to-noise ratio SNR (f). N 0
- Figure 23 shows the relationship between SNR (f) and w (f).
- w (f) to w (f) are expressed as (21), but n 0 0 1
- the amplitude smoothing unit 58 uses the input amplitude component IX (f) I of the current frame and the input amplitude component of the previous frame held by the amplitude holding unit 34
- the suppression coefficient calculation unit 36 obtains a suppression coefficient G (f) from the averaged amplitude component P n (f) and the estimated noise amplitude component / z n (f) according to Equation (9).
- the noise suppression unit 37 obtains the amplitude component (f) after noise suppression from X (f) and G (f) according to equation (10).
- the IFFT unit 37 converts the amplitude component S * (f) into the frequency domain force time domain, and obtains the signal s * (k) after noise suppression.
- FIG. 24 shows a block diagram of a fifth embodiment of the noise suppression apparatus of the present invention.
- FFTZIFFT is used for channel division and composition
- a smoothing method using an IIR filter is employed
- a nonlinear function is employed for calculating a suppression coefficient.
- the FFT unit 30 converts the input signal x (k) of the current frame n into the frequency domain f from the time domain k and the frequency domain signal of the input signal. Find X (f). Note that the subscript n represents a frame number.
- the amplitude calculator 31 obtains the input amplitude component I X (f) I from the frequency domain signal X (f).
- the noise estimation unit 32 detects a speech section, and obtains an estimated noise amplitude component z (f) from the input amplitude component I X (f) I according to the equation (7) when no speaker speech is detected.
- the amplitude smoothing unit 51 includes the input amplitude component IX (f) I, the average amplitude components P (f) and P (f) of the past two frames held by the amplitude holding unit 52, and the weighting factor. Weight from holder 61 n-1 n-2
- the averaged amplitude component P (f) is obtained from the only coefficient w (f) according to equation (18).
- the signal-to-noise ratio calculation unit 60 from the smoothed amplitude component P (f) and the estimated noise amplitude component ⁇ (f), the signal-to-noise ratio SNR ( f) is calculated.
- the weighting factor calculation unit 61 obtains a weighting factor w (f) from the signal-to-noise ratio SNR (f). N 0
- Figure 23 shows the relationship between SNR (f) and w (f).
- w (f) to w (f) are expressed as (21), but n 0 0 1
- the suppression coefficient calculation unit 54 obtains the suppression coefficient G (f) from the averaged amplitude component P (f) and the estimated noise amplitude component; z (f) using the nonlinear function func shown in the equation (19).
- the noise suppression unit 37 obtains the amplitude component (f) after noise suppression according to X (f) and G (f) force (10).
- the IFFT unit 37 converts the amplitude component (f) into the frequency domain force as well as the time domain, and obtains the signal s * (k) after noise suppression.
- FIG. 25 shows a block diagram of an embodiment of a mobile phone to which the apparatus of the present invention is applied.
- the output audio signal of the microphone 71 is subjected to noise suppression by the noise suppression device 70 of the present invention, encoded by the encoder 72, and transmitted from the transmission unit 73 to the public network 74.
- FIG. 26 shows a block diagram of another embodiment of a mobile phone to which the apparatus of the present invention is applied.
- a signal transmitted from the public network 74 is received by the receiving unit 75, decoded by the decoder 76, and noise suppressed by the noise suppression device 70 of the present invention. After that, it is supplied to the speaker 77 and pronounced.
- noise suppression device 70 of the present invention may be provided in both the transmission system and the reception system by combining FIGS. 25 and 26.
- the amplitude calculation units 31 and 41 correspond to the amplitude calculation means described in the claims
- the noise estimation units 32 and 42 correspond to the noise estimation unit
- the weight coefficient holding unit 35 correspond to the weight coefficient calculation unit 45
- the signal correspond to the weight coefficient generation means
- suppression coefficient calculation units 36 and 46 correspond to suppression amount calculation means
- 37 and 47 correspond to noise suppression means
- FFT unit 30 and channel division unit 40 correspond to frequency division means
- the IFFT unit 38 and the channel synthesis unit 48 correspond to frequency synthesis means.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004800441051A CN101027719B (zh) | 2004-10-28 | 2004-10-28 | 噪声抑制装置 |
EP04793135A EP1806739B1 (en) | 2004-10-28 | 2004-10-28 | Noise suppressor |
JP2006542170A JP4423300B2 (ja) | 2004-10-28 | 2004-10-28 | 雑音抑圧装置 |
PCT/JP2004/016027 WO2006046293A1 (ja) | 2004-10-28 | 2004-10-28 | 雑音抑圧装置 |
US11/727,062 US20070232257A1 (en) | 2004-10-28 | 2007-03-23 | Noise suppressor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/016027 WO2006046293A1 (ja) | 2004-10-28 | 2004-10-28 | 雑音抑圧装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/727,062 Continuation US20070232257A1 (en) | 2004-10-28 | 2007-03-23 | Noise suppressor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006046293A1 true WO2006046293A1 (ja) | 2006-05-04 |
Family
ID=36227545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016027 WO2006046293A1 (ja) | 2004-10-28 | 2004-10-28 | 雑音抑圧装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070232257A1 (ja) |
EP (1) | EP1806739B1 (ja) |
JP (1) | JP4423300B2 (ja) |
CN (1) | CN101027719B (ja) |
WO (1) | WO2006046293A1 (ja) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007336232A (ja) * | 2006-06-15 | 2007-12-27 | Nippon Telegr & Teleph Corp <Ntt> | 特定方向収音装置、特定方向収音プログラム、記録媒体 |
JP2008065090A (ja) * | 2006-09-07 | 2008-03-21 | Toshiba Corp | ノイズサプレス装置 |
JP2008064733A (ja) * | 2006-08-09 | 2008-03-21 | Fujitsu Ltd | 音源方向推定装置、音源方向推定方法、及びコンピュータプログラム |
JP2008076975A (ja) * | 2006-09-25 | 2008-04-03 | Fujitsu Ltd | 音信号補正方法、音信号補正装置及びコンピュータプログラム |
JP2008275616A (ja) * | 2007-04-26 | 2008-11-13 | Gebr Loepfe Ag | 周波数に応じた糸又は糸前駆体における欠陥箇所の検出 |
JP2008301079A (ja) * | 2007-05-30 | 2008-12-11 | Pioneer Electronic Corp | 音響装置、遅延時間測定方法、遅延時間測定プログラム及びその記憶媒体 |
JP2009025490A (ja) * | 2007-07-18 | 2009-02-05 | Nippon Telegr & Teleph Corp <Ntt> | 収音装置、収音方法、その方法を用いた収音プログラム、および記録媒体 |
JP2009044588A (ja) * | 2007-08-10 | 2009-02-26 | Nippon Telegr & Teleph Corp <Ntt> | 特定方向収音装置、特定方向収音方法、特定方向収音プログラム、記録媒体 |
JP2010032802A (ja) * | 2008-07-29 | 2010-02-12 | Kenwood Corp | 雑音抑制装置、雑音抑制方法、及び雑音抑制プログラム |
JP2010532879A (ja) * | 2007-07-06 | 2010-10-14 | オーディエンス,インコーポレイテッド | アダプティブ・インテリジェント・ノイズ抑制システム及び方法 |
JP2011191669A (ja) * | 2010-03-16 | 2011-09-29 | Sony Corp | 音声処理装置、音声処理方法およびプログラム |
JP2012113190A (ja) * | 2010-11-26 | 2012-06-14 | Nara Institute Of Science & Technology | 音響処理装置 |
JP2014079084A (ja) * | 2012-10-10 | 2014-05-01 | Nippon Signal Co Ltd:The | 車上装置、及び、これを用いた列車制御装置 |
JP2017122769A (ja) * | 2016-01-05 | 2017-07-13 | 株式会社東芝 | 雑音抑圧装置、雑音抑圧方法及びプログラム |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8489396B2 (en) * | 2007-07-25 | 2013-07-16 | Qnx Software Systems Limited | Noise reduction with integrated tonal noise reduction |
DE602007004217D1 (de) * | 2007-08-31 | 2010-02-25 | Harman Becker Automotive Sys | Schnelle Schätzung der Spektraldichte der Rauschleistung zur Sprachsignalverbesserung |
JP5453740B2 (ja) * | 2008-07-02 | 2014-03-26 | 富士通株式会社 | 音声強調装置 |
JP5535198B2 (ja) * | 2009-04-02 | 2014-07-02 | 三菱電機株式会社 | 雑音抑圧装置 |
JP2010249939A (ja) * | 2009-04-13 | 2010-11-04 | Sony Corp | ノイズ低減装置、ノイズ判定方法 |
CN102804260B (zh) * | 2009-06-19 | 2014-10-08 | 富士通株式会社 | 声音信号处理装置以及声音信号处理方法 |
CN102074241B (zh) * | 2011-01-07 | 2012-03-28 | 蔡镇滨 | 一种通过快速声音波形修复实现声音还原的方法 |
JP6182895B2 (ja) * | 2012-05-01 | 2017-08-23 | 株式会社リコー | 処理装置、処理方法、プログラム及び処理システム |
JP6135106B2 (ja) * | 2012-11-29 | 2017-05-31 | 富士通株式会社 | 音声強調装置、音声強調方法及び音声強調用コンピュータプログラム |
JP6439682B2 (ja) | 2013-04-11 | 2018-12-19 | 日本電気株式会社 | 信号処理装置、信号処理方法および信号処理プログラム |
EP3211538A4 (en) | 2015-05-08 | 2018-01-17 | Huawei Technologies Co. Ltd. | Signal processing method and apparatus |
GB201617409D0 (en) * | 2016-10-13 | 2016-11-30 | Asio Ltd | A method and system for acoustic communication of data |
GB201617408D0 (en) | 2016-10-13 | 2016-11-30 | Asio Ltd | A method and system for acoustic communication of data |
US11296739B2 (en) * | 2016-12-22 | 2022-04-05 | Nuvoton Technology Corporation Japan | Noise suppression device, noise suppression method, and reception device and reception method using same |
GB201704636D0 (en) | 2017-03-23 | 2017-05-10 | Asio Ltd | A method and system for authenticating a device |
GB2565751B (en) | 2017-06-15 | 2022-05-04 | Sonos Experience Ltd | A method and system for triggering events |
GB2570634A (en) | 2017-12-20 | 2019-08-07 | Asio Ltd | A method and system for improved acoustic transmission of data |
CN114650203B (zh) * | 2022-03-22 | 2023-10-27 | 吉林省广播电视研究所(吉林省广播电视局科技信息中心) | 单频振幅抑噪测量方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6021612A (ja) * | 1983-07-15 | 1985-02-04 | Matsushita Electric Ind Co Ltd | グラフイツク・イコライザ |
JP2000330597A (ja) * | 1999-05-20 | 2000-11-30 | Matsushita Electric Ind Co Ltd | 雑音抑圧装置 |
JP2002073066A (ja) * | 2000-08-31 | 2002-03-12 | Matsushita Electric Ind Co Ltd | 雑音抑圧装置及び雑音抑圧方法 |
JP2002140100A (ja) * | 2000-11-02 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 騒音抑圧装置 |
JP2003044087A (ja) * | 2001-08-03 | 2003-02-14 | Matsushita Electric Ind Co Ltd | 騒音抑圧装置、騒音抑圧方法、音声識別装置、通信機器および補聴器 |
JP2003131689A (ja) * | 2001-10-25 | 2003-05-09 | Nec Corp | ノイズ除去方法及び装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL84948A0 (en) * | 1987-12-25 | 1988-06-30 | D S P Group Israel Ltd | Noise reduction system |
PT1010168E (pt) * | 1997-02-21 | 2002-02-28 | Lernout & Hauspie Speechprod | Eliminacao acelerada de ruido de convolucao |
CA2312721A1 (en) * | 1997-12-08 | 1999-06-17 | Mitsubishi Denki Kabushiki Kaisha | Sound signal processing method and sound signal processing device |
US6415253B1 (en) * | 1998-02-20 | 2002-07-02 | Meta-C Corporation | Method and apparatus for enhancing noise-corrupted speech |
AU721270B2 (en) * | 1998-03-30 | 2000-06-29 | Mitsubishi Denki Kabushiki Kaisha | Noise reduction apparatus and noise reduction method |
US6088668A (en) * | 1998-06-22 | 2000-07-11 | D.S.P.C. Technologies Ltd. | Noise suppressor having weighted gain smoothing |
JP3454206B2 (ja) * | 1999-11-10 | 2003-10-06 | 三菱電機株式会社 | 雑音抑圧装置及び雑音抑圧方法 |
US6529868B1 (en) * | 2000-03-28 | 2003-03-04 | Tellabs Operations, Inc. | Communication system noise cancellation power signal calculation techniques |
US6862567B1 (en) * | 2000-08-30 | 2005-03-01 | Mindspeed Technologies, Inc. | Noise suppression in the frequency domain by adjusting gain according to voicing parameters |
US20050091049A1 (en) * | 2003-10-28 | 2005-04-28 | Rongzhen Yang | Method and apparatus for reduction of musical noise during speech enhancement |
US7454332B2 (en) * | 2004-06-15 | 2008-11-18 | Microsoft Corporation | Gain constrained noise suppression |
US20050288923A1 (en) * | 2004-06-25 | 2005-12-29 | The Hong Kong University Of Science And Technology | Speech enhancement by noise masking |
-
2004
- 2004-10-28 JP JP2006542170A patent/JP4423300B2/ja not_active Expired - Fee Related
- 2004-10-28 CN CN2004800441051A patent/CN101027719B/zh not_active Expired - Fee Related
- 2004-10-28 EP EP04793135A patent/EP1806739B1/en not_active Expired - Fee Related
- 2004-10-28 WO PCT/JP2004/016027 patent/WO2006046293A1/ja active Application Filing
-
2007
- 2007-03-23 US US11/727,062 patent/US20070232257A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6021612A (ja) * | 1983-07-15 | 1985-02-04 | Matsushita Electric Ind Co Ltd | グラフイツク・イコライザ |
JP2000330597A (ja) * | 1999-05-20 | 2000-11-30 | Matsushita Electric Ind Co Ltd | 雑音抑圧装置 |
JP2002073066A (ja) * | 2000-08-31 | 2002-03-12 | Matsushita Electric Ind Co Ltd | 雑音抑圧装置及び雑音抑圧方法 |
JP2002140100A (ja) * | 2000-11-02 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 騒音抑圧装置 |
JP2003044087A (ja) * | 2001-08-03 | 2003-02-14 | Matsushita Electric Ind Co Ltd | 騒音抑圧装置、騒音抑圧方法、音声識別装置、通信機器および補聴器 |
JP2003131689A (ja) * | 2001-10-25 | 2003-05-09 | Nec Corp | ノイズ除去方法及び装置 |
Non-Patent Citations (2)
Title |
---|
KATO M. ET AL: "Omomitsuki Zatsuon Suitei to MMSE STSA-ho ni Motozuku Kohinshitsu Zatsuon Yokuatsu", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS GIJUTSU KENKYU HOKOKU UGAZO KOGAKU], vol. 101, no. 19, 13 April 2001 (2001-04-13), pages 53 - 60, XP002999304 * |
See also references of EP1806739A4 * |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007336232A (ja) * | 2006-06-15 | 2007-12-27 | Nippon Telegr & Teleph Corp <Ntt> | 特定方向収音装置、特定方向収音プログラム、記録媒体 |
JP2008064733A (ja) * | 2006-08-09 | 2008-03-21 | Fujitsu Ltd | 音源方向推定装置、音源方向推定方法、及びコンピュータプログラム |
JP2008065090A (ja) * | 2006-09-07 | 2008-03-21 | Toshiba Corp | ノイズサプレス装置 |
JP2008076975A (ja) * | 2006-09-25 | 2008-04-03 | Fujitsu Ltd | 音信号補正方法、音信号補正装置及びコンピュータプログラム |
US8249270B2 (en) | 2006-09-25 | 2012-08-21 | Fujitsu Limited | Sound signal correcting method, sound signal correcting apparatus and computer program |
JP2008275616A (ja) * | 2007-04-26 | 2008-11-13 | Gebr Loepfe Ag | 周波数に応じた糸又は糸前駆体における欠陥箇所の検出 |
JP2008301079A (ja) * | 2007-05-30 | 2008-12-11 | Pioneer Electronic Corp | 音響装置、遅延時間測定方法、遅延時間測定プログラム及びその記憶媒体 |
JP2010532879A (ja) * | 2007-07-06 | 2010-10-14 | オーディエンス,インコーポレイテッド | アダプティブ・インテリジェント・ノイズ抑制システム及び方法 |
JP2009025490A (ja) * | 2007-07-18 | 2009-02-05 | Nippon Telegr & Teleph Corp <Ntt> | 収音装置、収音方法、その方法を用いた収音プログラム、および記録媒体 |
JP2009044588A (ja) * | 2007-08-10 | 2009-02-26 | Nippon Telegr & Teleph Corp <Ntt> | 特定方向収音装置、特定方向収音方法、特定方向収音プログラム、記録媒体 |
JP2010032802A (ja) * | 2008-07-29 | 2010-02-12 | Kenwood Corp | 雑音抑制装置、雑音抑制方法、及び雑音抑制プログラム |
JP2011191669A (ja) * | 2010-03-16 | 2011-09-29 | Sony Corp | 音声処理装置、音声処理方法およびプログラム |
JP2012113190A (ja) * | 2010-11-26 | 2012-06-14 | Nara Institute Of Science & Technology | 音響処理装置 |
JP2014079084A (ja) * | 2012-10-10 | 2014-05-01 | Nippon Signal Co Ltd:The | 車上装置、及び、これを用いた列車制御装置 |
JP2017122769A (ja) * | 2016-01-05 | 2017-07-13 | 株式会社東芝 | 雑音抑圧装置、雑音抑圧方法及びプログラム |
Also Published As
Publication number | Publication date |
---|---|
JP4423300B2 (ja) | 2010-03-03 |
CN101027719A (zh) | 2007-08-29 |
CN101027719B (zh) | 2010-05-05 |
US20070232257A1 (en) | 2007-10-04 |
JPWO2006046293A1 (ja) | 2008-05-22 |
EP1806739B1 (en) | 2012-08-15 |
EP1806739A4 (en) | 2008-06-04 |
EP1806739A1 (en) | 2007-07-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006046293A1 (ja) | 雑音抑圧装置 | |
JP4282227B2 (ja) | ノイズ除去の方法及び装置 | |
EP2008379B1 (en) | Adjustable noise suppression system | |
US8560308B2 (en) | Speech sound enhancement device utilizing ratio of the ambient to background noise | |
EP1141948B1 (en) | Method and apparatus for adaptively suppressing noise | |
US8521530B1 (en) | System and method for enhancing a monaural audio signal | |
US8477963B2 (en) | Method, apparatus, and computer program for suppressing noise | |
EP2031583B1 (en) | Fast estimation of spectral noise power density for speech signal enhancement | |
JP2001134287A (ja) | 雑音抑圧装置 | |
KR20060125572A (ko) | 노이즈 억제를 위한 방법 및 장치 | |
WO2006082636A1 (ja) | 信号処理方法および信号処理装置 | |
JP2004341339A (ja) | 雑音抑圧装置 | |
JP2007006525A (ja) | ノイズ除去の方法及び装置 | |
EP2689419A1 (en) | Method and arrangement for damping dominant frequencies in an audio signal | |
JP2003140700A (ja) | ノイズ除去方法及び装置 | |
JPH11265199A (ja) | 送話器 | |
EP2689418A1 (en) | Method and arrangement for damping of dominant frequencies in an audio signal | |
EP1278185A2 (en) | Method for improving noise reduction in speech transmission | |
WO2020110228A1 (ja) | 情報処理装置、プログラム及び情報処理方法 | |
JP2003131689A (ja) | ノイズ除去方法及び装置 | |
JP3310225B2 (ja) | 雑音レベル時間変動率計算方法及び装置と雑音低減方法及び装置 | |
JP2007226264A (ja) | 雑音抑圧装置 | |
JP5131149B2 (ja) | 雑音抑圧装置及び雑音抑圧方法 | |
JP4478045B2 (ja) | エコー消去装置、エコー消去方法、エコー消去プログラムおよびその記録媒体 | |
JP4209348B2 (ja) | エコー抑圧方法、この方法を実施する装置、プログラムおよび記録媒体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BW BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE EG ES FI GB GD GE GM HR HU ID IL IN IS JP KE KG KP KZ LC LK LR LS LT LU LV MA MD MK MN MW MX MZ NA NI NO NZ PG PH PL PT RO RU SC SD SE SG SK SY TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SZ TZ UG ZM ZW AM AZ BY KG MD RU TJ TM AT BE BG CH CY DE DK EE ES FI FR GB GR HU IE IT MC NL PL PT RO SE SI SK TR BF CF CG CI CM GA GN GQ GW ML MR SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006542170 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004793135 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11727062 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200480044105.1 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 2004793135 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11727062 Country of ref document: US |