JP2007179073A - 音声活性検出装置及び移動局並びに音声活性検出方法 - Google Patents
音声活性検出装置及び移動局並びに音声活性検出方法 Download PDFInfo
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- 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
- G10L25/78—Detection of presence or absence of voice signals
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- 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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- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
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- G10L2025/783—Detection of presence or absence of voice signals based on threshold decision
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- 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
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- 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
- G10L25/12—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 prediction coefficients
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- 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
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- G—PHYSICS
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- 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
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Abstract
【解決手段】該サブ信号中の推定された雑音に基づいて副判定信号(SNR(s))が生成され、該副判定信号に基づいて該入力音声信号についての音声活性判定(Vind )が形成される。入力音声信号のスペクトル成分及び雑音推定値が計算され、比較される。より具体的には、各サブ信号について信号対雑音比が計算され、その各信号対雑音比は副判定信号(SNR(s))を表す。その信号対雑音比から、それらの合計に比例する値が計算されて閾値と比較され、入力音声信号についての音声活性判定信号(Vind )がその比較に基づいて形成される。
【選択図】図2
Description
f = 0,...,64の値についての P(f) は中間周波数(f ・4000/64 Hz) に対応する。 (4)
N は入力フレーム中のサンプルの個数、
M はLPC次数(order)(例えば8)、
x(i)は入力フレーム中のサンプルである。
K は定数、例えば8000、であり、
k はパワーが計算される周波数に対応し(即ち、A(k)は周波数 k/K・fsに対応し、ここで fs はサンプル周波数である)、また、
M は短周期分析の次数(order)である。
l = Lmin,..., Lmax (例えば Lmin = 40、Lmax = 160)
である。
4 音声活性検出装置(VAD)
50 平方ブロック
70 計算ブロック
80 推定ブロック
90 計算ブロック
110 VAD判定ブロック
Claims (10)
- 入力信号(x(n))中の音声活性を検出するための手段と、
その検出に基づいて音声活性判定(Vind )を行うための手段とを有する音声活性検出装置において、
前記入力信号(x(n))を特定の周波数帯域を表すサブ信号(S(s))に分割するための手段(6)と、
該サブ信号中の雑音(N(s))を推定するための手段(80)と、
該サブ信号中の雑音に基づいて副判定信号(SNR(s))を計算するための手段(90)と、
該副判定信号に基づいて該入力信号について音声活性判定(Vind )を行うための手段(110)とをそなえることを特徴とする音声活性検出装置。 - 各サブ信号について信号対雑音比(SNR)を計算し、前記信号対雑音比を副判定信号(SNR(s))として供給するための手段(90)をそなえる、請求項1に記載の音声活性検出装置。
- 入力信号について音声活性判定(Vind )を行うための手段(110)は、前記信号対雑音比(SNR(s))に基づいて値(DSNR )を生成するための手段(111)と、前記の値(DSNR ) を閾値(vth)と比較し、前記の比較に基づいて音声活性判定信号(Vind )を出力するための手段(112)とから成る請求項2に記載の音声活性検出装置。
- 過去の信号対雑音比(SNR(s))に基づいて前記閾値(vth)を調整するための手段(113)を有する、請求項2に記載の音声活性検出装置。
- 前記音声活性検出装置は、推定された雑音の値(N(s))を記憶するための手段(80)を有し、前記雑音(N(s))は過去の及び現在の信号対雑音比(SNR(s))に依存して過去のサブ信号(S(s))で更新される、請求項2に記載の音声活性検出装置。
- 入力信号(x(n))に基づいて線形予測係数を計算するための手段(3)と、前記線形予測係数に基づいて前記サブ信号(S(s))を計算するための手段(8)とを有する、請求項1に記載の音声活性検出装置。
- 長周期予測分析を計算し、長周期予測利得(LTP gain sum)を含む長周期予測パラメータを生成するための手段(7)と、
前記長周期予測利得を閾値(thr lag)と比較するための手段(7)と、
前記比較に基づいて有声検出判定を生成するための手段とを有する、請求項1に記載の音声活性検出装置。 - 音声メッセージ(x(n))中の音声活性を検出するための手段と、
その検出に基づいて音声活性判定(Vind )を行うための手段とを有する、音声メッセージを送受信するための移動局において、
前記音声メッセージ(x(n))を特定の周波数帯域を表すサブ信号(S(s))に分割するための手段(6)と、
該サブ信号中の雑音(N(s))を推定するための手段(80)と、
該サブ信号中の雑音に基づいて副判定信号(SNR(s))を計算するための手段(90)と、
該副判定信号に基づいて入力信号について音声活性判定(Vind )を行うための手段(110)とをそなえることを特徴とする移動局。 - 入力信号(x(n))を受信し、
該入力信号中の音声活性を検出し、
その検出に基づいて音声活性判定(Vind )を行う(110)各ステップを有する、通信装置における音声活性を検出する方法において、
前記入力信号を特定の周波数帯域を表すサブ信号(S(s))に分割し(6)、
該サブ信号中の雑音(N(s))を推定し、
該サブ信号中の雑音に基づいて副判定信号(SNR(s))を計算し(90)、
該副判定信号に基づいて該入力信号についての音声活性判定(Vind )を行う(110)各ステップをそなえることを特徴とする方法。
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FI955947A FI100840B (fi) | 1995-12-12 | 1995-12-12 | Kohinanvaimennin ja menetelmä taustakohinan vaimentamiseksi kohinaises ta puheesta sekä matkaviestin |
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JP33223796A Expired - Lifetime JP4163267B2 (ja) | 1995-12-12 | 1996-12-12 | 雑音抑圧器及び移動局並びに雑音抑圧方法 |
JP2007051941A Withdrawn JP2007179073A (ja) | 1995-12-12 | 2007-03-01 | 音声活性検出装置及び移動局並びに音声活性検出方法 |
JP2008184572A Expired - Lifetime JP5006279B2 (ja) | 1995-12-12 | 2008-07-16 | 音声活性検出装置及び移動局並びに音声活性検出方法 |
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JP33223796A Expired - Lifetime JP4163267B2 (ja) | 1995-12-12 | 1996-12-12 | 雑音抑圧器及び移動局並びに雑音抑圧方法 |
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US (2) | US5839101A (ja) |
EP (2) | EP0790599B1 (ja) |
JP (4) | JPH09212195A (ja) |
AU (2) | AU1067797A (ja) |
DE (2) | DE69630580T2 (ja) |
FI (1) | FI100840B (ja) |
WO (2) | WO1997022117A1 (ja) |
Cited By (1)
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1995
- 1995-12-12 FI FI955947A patent/FI100840B/fi not_active IP Right Cessation
-
1996
- 1996-11-08 EP EP96117902A patent/EP0790599B1/en not_active Expired - Lifetime
- 1996-11-08 DE DE69630580T patent/DE69630580T2/de not_active Expired - Lifetime
- 1996-11-19 EP EP96118504A patent/EP0784311B1/en not_active Expired - Lifetime
- 1996-11-19 DE DE69614989T patent/DE69614989T2/de not_active Expired - Lifetime
- 1996-12-05 WO PCT/FI1996/000649 patent/WO1997022117A1/en active Application Filing
- 1996-12-05 WO PCT/FI1996/000648 patent/WO1997022116A2/en active Application Filing
- 1996-12-05 AU AU10677/97A patent/AU1067797A/en not_active Abandoned
- 1996-12-05 AU AU10678/97A patent/AU1067897A/en not_active Abandoned
- 1996-12-10 US US08/762,938 patent/US5839101A/en not_active Expired - Lifetime
- 1996-12-10 US US08/763,975 patent/US5963901A/en not_active Expired - Lifetime
- 1996-12-12 JP JP8331874A patent/JPH09212195A/ja not_active Withdrawn
- 1996-12-12 JP JP33223796A patent/JP4163267B2/ja not_active Expired - Lifetime
-
2007
- 2007-03-01 JP JP2007051941A patent/JP2007179073A/ja not_active Withdrawn
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2008
- 2008-07-16 JP JP2008184572A patent/JP5006279B2/ja not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013508772A (ja) * | 2009-10-19 | 2013-03-07 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 音声活動検出のための方法および背景推定器 |
US9202476B2 (en) | 2009-10-19 | 2015-12-01 | Telefonaktiebolaget L M Ericsson (Publ) | Method and background estimator for voice activity detection |
US9418681B2 (en) | 2009-10-19 | 2016-08-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and background estimator for voice activity detection |
Also Published As
Publication number | Publication date |
---|---|
FI100840B (fi) | 1998-02-27 |
US5839101A (en) | 1998-11-17 |
JP2008293038A (ja) | 2008-12-04 |
EP0790599B1 (en) | 2003-11-05 |
JPH09204196A (ja) | 1997-08-05 |
AU1067897A (en) | 1997-07-03 |
EP0784311A1 (en) | 1997-07-16 |
JP4163267B2 (ja) | 2008-10-08 |
WO1997022116A2 (en) | 1997-06-19 |
EP0790599A1 (en) | 1997-08-20 |
DE69614989T2 (de) | 2002-04-11 |
EP0784311B1 (en) | 2001-09-05 |
JPH09212195A (ja) | 1997-08-15 |
JP5006279B2 (ja) | 2012-08-22 |
US5963901A (en) | 1999-10-05 |
WO1997022116A3 (en) | 1997-07-31 |
FI955947A (fi) | 1997-06-13 |
FI955947A0 (fi) | 1995-12-12 |
DE69630580D1 (de) | 2003-12-11 |
DE69630580T2 (de) | 2004-09-16 |
WO1997022117A1 (en) | 1997-06-19 |
AU1067797A (en) | 1997-07-03 |
DE69614989D1 (de) | 2001-10-11 |
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