WO2010058804A1 - ノイズゲート、収音装置及びノイズ除去方法 - Google Patents
ノイズゲート、収音装置及びノイズ除去方法 Download PDFInfo
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- WO2010058804A1 WO2010058804A1 PCT/JP2009/069588 JP2009069588W WO2010058804A1 WO 2010058804 A1 WO2010058804 A1 WO 2010058804A1 JP 2009069588 W JP2009069588 W JP 2009069588W WO 2010058804 A1 WO2010058804 A1 WO 2010058804A1
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- 238000000034 method Methods 0.000 title claims description 6
- 230000005236 sound signal Effects 0.000 claims abstract description 69
- 238000001228 spectrum Methods 0.000 claims abstract description 61
- 238000006243 chemical reaction Methods 0.000 claims 2
- 230000000593 degrading effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000002542 deteriorative effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G10L15/00—Speech recognition
- G10L15/20—Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise, of stress induced speech
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
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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
- G10L21/0232—Processing in the frequency domain
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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
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/27—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the analysis technique
Definitions
- the present invention relates to a noise gate, a sound collection device, and a noise removal method for removing noise contained in an audio signal.
- a noise gate is provided as means for removing noise (see, for example, Patent Document 1).
- the threshold value of the noise gate is changed according to the amplification degree of the head amplifier that amplifies the audio signal, and the audio signal less than the threshold value is removed.
- the present invention provides a noise gate, a sound collection device, and a noise removal method that can easily remove stationary noise without deteriorating an audio signal.
- the noise gate of the present invention estimates the noise spectrum of stationary noise (hereinafter referred to as stationary noise) included in the audio signal based on the frequency spectrum of the input audio signal.
- the noise gate calculates a signal level ratio between the frequency spectrum of the input audio signal and the estimated noise spectrum.
- the noise gate outputs the frequency spectrum of the audio signal in which the signal level in the frequency band in which the calculated signal level ratio is less than a predetermined threshold is lowered.
- the noise gate outputs the frequency spectrum of the voice signal including the speaker's uttered voice and reduces the signal level of the frequency spectrum of the voice signal composed of stationary noise, so that the speaker's uttered voice is not degraded.
- an audio signal from which only stationary noise is removed can be output.
- the threshold value may be set to be larger by a value corresponding to the estimation error of the estimation means than a value at which the signal level ratio is 1. This is because the noise gate calculates the signal level ratio to be compared with the threshold value using the estimated stationary noise, so that an estimation error of the stationary noise is taken into consideration.
- the sound collection device of the present invention includes the above-described noise gate.
- the sound collection device converts a sound signal generated by collecting sound into a frequency spectrum that is a frequency domain signal, and outputs the frequency spectrum to a noise gate.
- the sound collection device also inversely converts the frequency spectrum of the audio signal output from the noise gate into an audio signal that is a time domain signal.
- the sound collection device can remove stationary noise from the collected sound signal by using the above-described noise gate. For this reason, the sound collection device can emit sound without deteriorating the voice of the collected speaker.
- a step of inputting a frequency spectrum of an audio signal a step of estimating a noise spectrum based on the frequency spectrum of the audio signal input at the input, the frequency spectrum of the audio signal, A step of calculating a signal level ratio between the noise spectrum estimated in the estimation step and a frequency of the audio signal obtained by reducing a gain in a frequency band in which the signal level ratio calculated in the calculation step is less than a predetermined threshold And a step of outputting a spectrum.
- the threshold value is set to be larger than the value at which the signal level ratio is 1 by a value corresponding to the estimation error of the estimation unit used in the estimation process.
- the noise gate of the present invention can output a voice signal from which only stationary noise is removed without degrading the voice of the speaker.
- FIG. 1 It is a block diagram which shows the function and structure of a sound collection device. It is a figure which shows an example of a gain table.
- (A) to (C) are diagrams showing examples of stationary noise, an audio signal, and an audio signal after noise removal. It is a figure which shows the other example of a gain table.
- FIG. 1 is a block diagram showing the function and configuration of the sound collection device.
- FIG. 2 is a diagram illustrating an example of the gain table.
- the sound collection device 1 includes a noise gate 12 (see FIG. 1).
- the sound collection device 1 converts the collected sound signal NE′T into a frequency spectrum NE′N.
- the sound collection device 1 removes the stationary noise N′N included in the audio signal NE′N by the noise gate 12.
- the stationary noise N′N is estimated by the noise gate 12 based on the frequency spectrum NE′N.
- the sound collection device 1 outputs a sound signal CO′T generated by inversely transforming the frequency spectrum CO′N after removing the stationary noise N′N with respect to the time axis.
- a time-domain signal indicates a terminal symbol by 'T
- a frequency-domain signal indicates a terminal symbol by' N.
- the sound collection device 1 includes a microphone MIC, an FFT processing unit 11, a noise gate 12, and an IFFT processing unit 13.
- the microphone MIC picks up surrounding sounds and generates an audio signal.
- the microphone MIC outputs the generated audio signal NE′T to the FFT processing unit 11.
- the FFT processing unit 11 is a fast Fourier transform circuit, converts an audio signal NE′T, which is a time domain signal, into an audio signal NE′N, which is a frequency domain signal, and performs an estimation unit 121 and a noise of the noise gate 12.
- the audio signal NE′N is output to the removing unit 122.
- the noise gate 12 includes an estimation unit 121 and a noise removal unit 122.
- the estimation unit 121 performs a process of estimating the stationary noise N′N included in the audio signal NE′N input from the FFT processing unit 11.
- the estimation unit 121 sequentially acquires and temporarily stores a frequency spectrum (hereinafter referred to as a speech spectrum) S (NE′N) at a certain sample timing of the speech signal NE′N.
- a speech spectrum hereinafter referred to as a speech spectrum
- the estimation unit 121 uses the frequency spectrum at a certain sample timing of the stationary noise N′N (hereinafter referred to as a noise spectrum) S (N 'N) is estimated.
- the estimation unit 121 outputs the estimated noise spectrum S (N′N) to the noise removal unit 122.
- the noise spectrum S (N′N (T)) can be expressed by the following formula 1.
- the noise removal unit 122 removes the stationary noise N′N from the audio signal NE′N input from the FFT processing unit 11 and outputs the audio signal CO′N after the noise removal to the IFFT processing unit 13. Specifically, the noise removal unit 122 calculates a signal level ratio between the speech spectrum S (NE′N) and the noise spectrum S (N′N) input from the estimation unit 121. When the calculated signal level ratio is less than the threshold value, the noise removal unit 122 lowers the gain of the voice spectrum S (NE′N) in the frequency band where the signal level ratio is less than the threshold value, and outputs the result.
- the noise removing unit 122 includes a gain table TBL shown in FIG.
- the gain table TBL determines the gain of the voice spectrum S (NE′N) according to the calculated signal level ratio.
- the gain table TBL sets the gain to 1 when the signal level ratio is greater than or equal to the threshold, and sets the gain to 0 when the signal level ratio is less than the threshold.
- the frequency spectrum S (CO′N) at a certain sample timing of the audio signal CO′N after noise removal can be expressed by the following Expression 2.
- the noise removing unit 122 outputs the speech spectrum S (NE′N) as it is without changing the signal level at a frequency where the signal level ratio is equal to or higher than the threshold. Also, the noise removal unit 122 regards the audio spectrum S (NE′N) as the noise spectrum S (N′N) and outputs the signal level as 0 in the frequency band where the signal level ratio is less than the threshold.
- the noise removal unit 122 may consider the estimation error of the stationary noise N′N and set the threshold value to a value slightly larger than the value (1.0) at which the signal level ratio is 1. In this way, the noise removing unit 122 removes the stationary noise N′N even when the signal level of the stationary noise N′N is estimated to be lower than the actual level due to the estimation error of the stationary noise N′N. Can do.
- the IFFT processing unit 13 is an inverse fast Fourier transform circuit, which converts the audio signal CO′N, which is a frequency domain signal, into an audio signal CO′T, which is a time domain signal, and outputs it.
- the sound collection device 1 can leave the voice signal in the frequency band where the voice of the speaker is present without being attenuated, it can emit the voice of the speaker without deteriorating. .
- FIGS. 3A to 3C are diagrams illustrating examples of stationary noise, an audio signal, and an audio signal after noise removal.
- 3A shows the signal level of stationary noise
- FIG. 3B shows the signal level of an audio signal containing stationary noise
- FIG. 3C shows the signal level of the audio signal after noise removal. Indicates.
- the sound collection device 1 estimates a stationary noise N′N as shown in FIG. 3A and generates an audio signal NE′N as shown in FIG.
- the sound collection device 1 simply subtracts the noise N′N from the audio signal NE′N, as shown by a broken line in FIG.
- the sound collecting apparatus 1 may have a stationary noise N′N remaining in the audio signal NE′N due to an estimation error of the stationary noise N′N. In this case, since the sound collection device 1 has a significant signal level variation in a frequency band in which the speaker's speech is not present, musical noise is generated.
- the sound collection device 1 leaves a frequency band in which the speaker's uttered voice exists, as shown by a solid line in FIG. Since the signal level (gain) of the voice signal in the frequency band in which the voice signal is present is lowered, sound can be emitted without deteriorating the quality of the voice of the speaker. Further, since the sound collection device 1 determines the output value CO′N according to the signal level ratio between the audio signal NE′N and the stationary noise N′N, the signal level is in a frequency band where there is no speaker's speech. Variation is less likely to occur, and the generation of musical noise can be prevented. Furthermore, since the sound collection device 1 obtains the signal level ratio between the voice signal NE′N and the stationary noise N′N, it is possible to detect a frequency band in which only noise exists even if the speaker's voice is small. .
- the sound collection device 1 maintains the signal level of the voice signal in the frequency band where the speaker's uttered voice exists and the signal level of the voice signal in the frequency band where the uttered voice of the speaker does not exist. (Gain) was output as 0. However, the sound collection device 1 maintains the signal level of the audio signal in the frequency band in which the speaker's uttered voice exists, and sets the signal level (gain) of the audio signal in the frequency band in which the speaker's uttered voice does not exist to 0. It may be lowered to a larger value.
- FIG. 4 is a diagram illustrating another example of the gain table. In this case, for example, as shown in FIG.
- the sound collection device 1 sets the gain of the audio signal in the frequency band where the speaker's uttered voice does not exist to 0.5 and sets the gain in the frequency band where the speaker's uttered voice does not exist.
- the signal level of the audio signal is multiplied by 0.5 and output.
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- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
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- Noise Elimination (AREA)
Abstract
Description
このように、音声スペクトルに基づいてノイズスペクトルS(N’N(T))を推定することで、暗騒音等の定常ノイズを推定することができる。なお、推定部121は、マイクMICが収音した音声信号のレベルが低い状態(無音状態)の場合のみ、ノイズスペクトルの推定処理を行うものとする。
この結果、ノイズ除去部122は、信号レベル比が閾値以上の周波数では、音声スペクトルS(NE’N)を、信号レベルを変更せずにそのまま出力する。また、ノイズ除去部122は、信号レベル比が閾値未満の周波数帯域では、音声スペクトルS(NE’N)をノイズスペクトルS(N’N)とみなしてその信号レベルを0として出力する。
本発明は、2008年11月21日出願の日本特許出願(特願2008-298332)に基づくものであり、その内容はここに参照として取り込まれる。
11…FFT処理部
12…ノイズゲート
121…推定部
122…ノイズ除去部
13…IFFT処理部
MIC…マイク
Claims (5)
- 音声信号の周波数スペクトルが入力される入力手段と、
前記入力手段に入力された音声信号の周波数スペクトルに基づいて、ノイズスペクトルを推定する推定手段と、
前記音声信号の周波数スペクトルと、前記推定手段が推定したノイズスペクトルと、の信号レベル比を算出して、該信号レベル比が所定の閾値未満の周波数帯域の信号レベルを下げた前記音声信号の周波数スペクトルを出力する出力手段と、を備えたノイズゲート。 - 前記閾値は、前記信号レベル比が1となる値より前記推定手段の推定誤差に対応する値だけ大きく設定される請求項1に記載のノイズゲート。
- 請求項1または請求項2のいずれかに記載のノイズゲートと、
周囲の音声を収音して音声信号を生成する収音手段と、
前記収音手段が生成した音声信号を周波数領域の信号である周波数スペクトルに変換する変換手段と、
前記変換手段によって変換された周波数スペクトルを、前記ノイズゲートの入力手段に入力し、
前記ノイズゲートの出力手段が出力した音声信号の周波数スペクトルを時間領域の信号である音声信号に逆変換する逆変換手段と、を備えた収音装置。 - 音声信号の周波数スペクトルを入力する工程と、
前記入力にて入力された音声信号の周波数スペクトルに基づいて、ノイズスペクトルを推定する工程と、
前記音声信号の周波数スペクトルと、前記推定工程にて推定されノイズスペクトルと、の信号レベル比を算出する工程と、
前記算出工程にて算出された信号レベル比が所定の閾値未満の周波数帯域の信号レベルを下げた前記音声信号の周波数スペクトルを出力する工程と、を備えたノイズ除去方法。 - 前記閾値は、前記信号レベル比が1となる値より前記推定工程で使用される推定部の推定誤差に対応する値だけ大きく設定される請求項4に記載のノイズ除去方法。
Priority Applications (4)
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US13/130,532 US9036830B2 (en) | 2008-11-21 | 2009-11-18 | Noise gate, sound collection device, and noise removing method |
KR1020117011535A KR101254876B1 (ko) | 2008-11-21 | 2009-11-18 | 노이즈 게이트, 수음 장치 및 노이즈 제거 방법 |
EP09827585.2A EP2352148B1 (en) | 2008-11-21 | 2009-11-18 | Noise gate, sound collection device, and noise removal method |
CN2009801462950A CN102216984B (zh) | 2008-11-21 | 2009-11-18 | 噪声门、声音采集装置及噪声消除方法 |
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JP2008298332A JP2010122617A (ja) | 2008-11-21 | 2008-11-21 | ノイズゲート、及び収音装置 |
JP2008-298332 | 2008-11-21 |
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EP (1) | EP2352148B1 (ja) |
JP (1) | JP2010122617A (ja) |
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CN102393986A (zh) * | 2011-08-11 | 2012-03-28 | 重庆市科学技术研究院 | 基于音频判别的盗伐检测方法、装置及系统 |
US20140010273A1 (en) * | 2010-12-20 | 2014-01-09 | France Telecom | Impulse noise measurement by spectral detection |
US9117456B2 (en) * | 2010-11-25 | 2015-08-25 | Fujitsu Limited | Noise suppression apparatus, method, and a storage medium storing a noise suppression program |
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US10368173B1 (en) | 2017-03-24 | 2019-07-30 | Advanced Bionics Ag | Systems and methods for minimizing an effect of system noise generated by a cochlear implant system |
US10595134B1 (en) | 2017-03-24 | 2020-03-17 | Advanced Bionics Ag | Systems and methods for detecting and reacting to system noise generated by a cochlear implant system |
KR102466134B1 (ko) * | 2018-06-26 | 2022-11-10 | 엘지디스플레이 주식회사 | 표시 장치 |
CN112447166A (zh) * | 2019-08-16 | 2021-03-05 | 阿里巴巴集团控股有限公司 | 一种针对目标频谱矩阵的处理方法及装置 |
US11557307B2 (en) * | 2019-10-20 | 2023-01-17 | Listen AS | User voice control system |
CN113938805B (zh) * | 2020-07-14 | 2024-04-23 | 广州汽车集团股份有限公司 | 一种低音音质的量化方法及装置 |
JP2023106686A (ja) | 2022-01-21 | 2023-08-02 | ヤマハ株式会社 | 音声処理装置および音声処理方法 |
JP2023137650A (ja) | 2022-03-18 | 2023-09-29 | ヤマハ株式会社 | 音信号処理方法及び音信号処理装置 |
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- 2009-11-18 CN CN2009801462950A patent/CN102216984B/zh active Active
- 2009-11-18 EP EP09827585.2A patent/EP2352148B1/en active Active
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US20140010273A1 (en) * | 2010-12-20 | 2014-01-09 | France Telecom | Impulse noise measurement by spectral detection |
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EP2352148B1 (en) | 2013-10-16 |
EP2352148A1 (en) | 2011-08-03 |
US20110268288A1 (en) | 2011-11-03 |
KR101254876B1 (ko) | 2013-04-15 |
EP2352148A4 (en) | 2012-08-22 |
JP2010122617A (ja) | 2010-06-03 |
KR20110082176A (ko) | 2011-07-18 |
CN102216984A (zh) | 2011-10-12 |
US9036830B2 (en) | 2015-05-19 |
CN102216984B (zh) | 2013-03-27 |
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