EP1267325A1 - Verfahren zur Sprachaktivitätsdetektion in einem Signal, und Sprachkodierer mit Vorrichtung zur Ausführung des Verfahrens - Google Patents
Verfahren zur Sprachaktivitätsdetektion in einem Signal, und Sprachkodierer mit Vorrichtung zur Ausführung des Verfahrens Download PDFInfo
- Publication number
- EP1267325A1 EP1267325A1 EP02290984A EP02290984A EP1267325A1 EP 1267325 A1 EP1267325 A1 EP 1267325A1 EP 02290984 A EP02290984 A EP 02290984A EP 02290984 A EP02290984 A EP 02290984A EP 1267325 A1 EP1267325 A1 EP 1267325A1
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- frame
- voice
- decision
- noise
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- 235000021183 entrée Nutrition 0.000 description 7
- 230000001755 vocal effect Effects 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 4
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Images
Classifications
-
- 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
- G10L25/78—Detection of presence or absence of voice signals
-
- 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
- G10L25/78—Detection of presence or absence of voice signals
- G10L2025/783—Detection of presence or absence of voice signals based on threshold decision
Definitions
- the invention relates to a voice signal encoder comprising a device improved voice activity detection, and in particular an encoder conforming to the ITU-T G.729A standard, annex B.
- a voice signal has up to 60% silence or background noise.
- it is known to discriminate the voice signal portions that actually contain useful signals and the portions that contain only silence or noise; and code them respectively according to two different algorithms, each portion which contains that silence or noise being coded with very little information representing the characteristics of ambient noise.
- Such an encoder includes a device for voice activity detection which realizes this discrimination according to spectral characteristics and according to the energy of the voice signal to be coded (calculated on each signal frame).
- the voice signal is divided into digital frames corresponding to a duration of 10ms, for example.
- a set of parameters is extract the signal.
- the main parameters are auto coefficients correlation.
- a set of linear prediction coding coefficients, and a set of frequency parameters are then deduced from these auto coefficients correlation.
- One of the steps in the signal portion discrimination process voice that actually contain useful signals and portions that don't contain only silence or noise is to compare the energy of a signal frame with a threshold.
- a device for calculating the threshold value adapts the threshold value as a function of noise variations. Noise affecting the signal vocal is composed of noise of electrical origin and ambient noise. This last can increase or decrease significantly during the same communication.
- frequency noise filtering coefficients must also be adapted to variations in noise.
- the decoder responsible for decoding the coded voice signal must use alternately two corresponding decoding algorithms respectively to signal portions encoded as voice and to signal portions encoded like silence or background noise.
- the transition from one algorithm to another is synchronized by the information coding the periods of silence or noise.
- the object of the invention is to propose a more effective solution, which preserves the effectiveness of voice activity detection in terms of traffic, but which does not affect the quality of the signal reproduced after decoding.
- the process thus characterized avoids an undesirable “noise” transition towards “Voice” during an increase in transient energy during frame n only, because the smoothing function takes into account the final decision taken for frame n-1 preceding the current frame n, to decide on a transition from "noise” to "voice".
- the method according to the invention furthermore consists in preventing any final “noise” decision for frames n + 1 to n + i where i is an integer defining a duration of inertia.
- the process thus characterized avoids the phenomenon of loss of segments speech because the smoothing function has an inertia corresponding to the duration of i frames, for returning to a “noise” decision.
- the subject of the invention is also a voice signal coder comprising smoothing means for implementing the method according to the invention.
- FIG. 5 represents respectively the percentages of errors with the known method and with the method according to the invention, for different values of the signal to noise ratio.
- Figure 6 shows the percentages of speech loss with the known method and with the method according to the invention, for different values of the signal to noise ratio.
- the coder When the voice signal is a useful signal, the coder provides a frame every 10 ms. When the voice signal consists of silence (or noise), the encoder provides a single frame, at the start of the period of silence (or noise).
- such an encoder can be produced by means of a processor. suitably programmed.
- the method according to the invention can be implemented by software whose realization is within the reach of man art.
- FIG. 2 represents the flowchart of the decision making “voice” or “noise”, according to the coding method known by the standard G.729 appendix B, 11/96. The method is applied to digitized signal frames having a fixed duration of 10 ms.
- a first step 11 consists in extracting four parameters for the current frame of the signal to be coded: the energy of this frame in the whole band of frequencies, the energy of this frame in the low frequencies, a set of spectral coefficients, and the rate of zero crossings.
- the next step 12 consists in updating the minimum size of a buffer memory.
- the curves E1 and E2 respectively represent the percentages of errors with the known method and with the method according to the invention, for different values of the signal to noise ratio.
- the curves L1 and L2 respectively represent the percentages of speech losses with the known method and with the method according to the invention, for different values of the signal to noise ratio.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Computational Linguistics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Communication Control (AREA)
- Circuits Of Receivers In General (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0107585A FR2825826B1 (fr) | 2001-06-11 | 2001-06-11 | Procede pour detecter l'activite vocale dans un signal, et codeur de signal vocal comportant un dispositif pour la mise en oeuvre de ce procede |
FR0107585 | 2001-06-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1267325A1 true EP1267325A1 (de) | 2002-12-18 |
EP1267325B1 EP1267325B1 (de) | 2004-06-16 |
Family
ID=8864153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02290984A Expired - Lifetime EP1267325B1 (de) | 2001-06-11 | 2002-04-18 | Verfahren zur Sprachaktivitätsdetektion in einem Signal, und Sprachkodierer mit Vorrichtung zur Ausführung des Verfahrens |
Country Status (8)
Country | Link |
---|---|
US (1) | US7596487B2 (de) |
EP (1) | EP1267325B1 (de) |
JP (2) | JP3992545B2 (de) |
CN (1) | CN1162835C (de) |
AT (1) | ATE269573T1 (de) |
DE (1) | DE60200632T2 (de) |
ES (1) | ES2219624T3 (de) |
FR (1) | FR2825826B1 (de) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7756709B2 (en) * | 2004-02-02 | 2010-07-13 | Applied Voice & Speech Technologies, Inc. | Detection of voice inactivity within a sound stream |
GB0408856D0 (en) * | 2004-04-21 | 2004-05-26 | Nokia Corp | Signal encoding |
DE602004008676T2 (de) * | 2004-05-17 | 2008-06-05 | Nokia Corp. | Audiocodierung mit verschiedenen codierungsmodellen |
DE102004049347A1 (de) * | 2004-10-08 | 2006-04-20 | Micronas Gmbh | Schaltungsanordnung bzw. Verfahren für Sprache enthaltende Audiosignale |
KR100657912B1 (ko) * | 2004-11-18 | 2006-12-14 | 삼성전자주식회사 | 잡음 제거 방법 및 장치 |
US20060241937A1 (en) * | 2005-04-21 | 2006-10-26 | Ma Changxue C | Method and apparatus for automatically discriminating information bearing audio segments and background noise audio segments |
KR20080059881A (ko) * | 2006-12-26 | 2008-07-01 | 삼성전자주식회사 | 음성 신호의 전처리 장치 및 방법 |
EP2491559B1 (de) * | 2009-10-19 | 2014-12-10 | Telefonaktiebolaget LM Ericsson (publ) | Verfahren und hintergrundbestimmungsgerät zur erkennung von sprachaktivitäten |
CN102137194B (zh) * | 2010-01-21 | 2014-01-01 | 华为终端有限公司 | 一种通话检测方法及装置 |
EP2743924B1 (de) * | 2010-12-24 | 2019-02-20 | Huawei Technologies Co., Ltd. | Verfahren und Vorrichtung zur adaptiven Detektion einer Stimmaktivität in einem Audioeingangssignal |
WO2012152323A1 (en) * | 2011-05-11 | 2012-11-15 | Robert Bosch Gmbh | System and method for emitting and especially controlling an audio signal in an environment using an objective intelligibility measure |
US20130090926A1 (en) * | 2011-09-16 | 2013-04-11 | Qualcomm Incorporated | Mobile device context information using speech detection |
CN103325385B (zh) * | 2012-03-23 | 2018-01-26 | 杜比实验室特许公司 | 语音通信方法和设备、操作抖动缓冲器的方法和设备 |
CN103325386B (zh) * | 2012-03-23 | 2016-12-21 | 杜比实验室特许公司 | 用于信号传输控制的方法和系统 |
CN105681966B (zh) * | 2014-11-19 | 2018-10-19 | 塞舌尔商元鼎音讯股份有限公司 | 降低噪音的方法及电子装置 |
US10928502B2 (en) * | 2018-05-30 | 2021-02-23 | Richwave Technology Corp. | Methods and apparatus for detecting presence of an object in an environment |
CN109360585A (zh) * | 2018-12-19 | 2019-02-19 | 晶晨半导体(上海)股份有限公司 | 一种语音激活检测方法 |
CN113555025A (zh) * | 2020-04-26 | 2021-10-26 | 华为技术有限公司 | 一种静音描述帧发送、协商方法及装置 |
CN115132231B (zh) * | 2022-08-31 | 2022-12-13 | 安徽讯飞寰语科技有限公司 | 语音活性检测方法、装置、设备及可读存储介质 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5410632A (en) * | 1991-12-23 | 1995-04-25 | Motorola, Inc. | Variable hangover time in a voice activity detector |
US5649055A (en) * | 1993-03-26 | 1997-07-15 | Hughes Electronics | Voice activity detector for speech signals in variable background noise |
US5826230A (en) * | 1994-07-18 | 1998-10-20 | Matsushita Electric Industrial Co., Ltd. | Speech detection device |
FR2797343A1 (fr) * | 1999-08-04 | 2001-02-09 | Matra Nortel Communications | Procede et dispositif de detection d'activite vocale |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0240700A (ja) * | 1988-08-01 | 1990-02-09 | Matsushita Electric Ind Co Ltd | 音声検出装置 |
JPH0424692A (ja) * | 1990-05-18 | 1992-01-28 | Ricoh Co Ltd | 音声区間検出方式 |
US5583961A (en) * | 1993-03-25 | 1996-12-10 | British Telecommunications Public Limited Company | Speaker recognition using spectral coefficients normalized with respect to unequal frequency bands |
JP2897628B2 (ja) * | 1993-12-24 | 1999-05-31 | 三菱電機株式会社 | 音声検出器 |
JP3109978B2 (ja) * | 1995-04-28 | 2000-11-20 | 松下電器産業株式会社 | 音声区間検出装置 |
US5819217A (en) * | 1995-12-21 | 1998-10-06 | Nynex Science & Technology, Inc. | Method and system for differentiating between speech and noise |
JP3297346B2 (ja) * | 1997-04-30 | 2002-07-02 | 沖電気工業株式会社 | 音声検出装置 |
US6188981B1 (en) * | 1998-09-18 | 2001-02-13 | Conexant Systems, Inc. | Method and apparatus for detecting voice activity in a speech signal |
US6691084B2 (en) * | 1998-12-21 | 2004-02-10 | Qualcomm Incorporated | Multiple mode variable rate speech coding |
JP3759685B2 (ja) * | 1999-05-18 | 2006-03-29 | 三菱電機株式会社 | 雑音区間判定装置,雑音抑圧装置及び推定雑音情報更新方法 |
US7478042B2 (en) * | 2000-11-30 | 2009-01-13 | Panasonic Corporation | Speech decoder that detects stationary noise signal regions |
-
2001
- 2001-06-11 FR FR0107585A patent/FR2825826B1/fr not_active Expired - Fee Related
-
2002
- 2002-04-18 ES ES02290984T patent/ES2219624T3/es not_active Expired - Lifetime
- 2002-04-18 DE DE60200632T patent/DE60200632T2/de not_active Expired - Lifetime
- 2002-04-18 AT AT02290984T patent/ATE269573T1/de not_active IP Right Cessation
- 2002-04-18 EP EP02290984A patent/EP1267325B1/de not_active Expired - Lifetime
- 2002-05-10 US US10/142,060 patent/US7596487B2/en not_active Expired - Fee Related
- 2002-05-29 CN CNB021217432A patent/CN1162835C/zh not_active Expired - Fee Related
- 2002-06-10 JP JP2002168375A patent/JP3992545B2/ja not_active Expired - Fee Related
-
2006
- 2006-03-28 JP JP2006087186A patent/JP2006189907A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5410632A (en) * | 1991-12-23 | 1995-04-25 | Motorola, Inc. | Variable hangover time in a voice activity detector |
US5649055A (en) * | 1993-03-26 | 1997-07-15 | Hughes Electronics | Voice activity detector for speech signals in variable background noise |
US5826230A (en) * | 1994-07-18 | 1998-10-20 | Matsushita Electric Industrial Co., Ltd. | Speech detection device |
FR2797343A1 (fr) * | 1999-08-04 | 2001-02-09 | Matra Nortel Communications | Procede et dispositif de detection d'activite vocale |
Non-Patent Citations (1)
Title |
---|
JONGSEO SOHN ET AL: "A statistical model-based voice activity detection", IEEE SIGNAL PROCESSING LETTERS, JAN. 1999, IEEE, USA, vol. 6, no. 1, pages 1 - 3, XP002189007, ISSN: 1070-9908 * |
Also Published As
Publication number | Publication date |
---|---|
DE60200632D1 (de) | 2004-07-22 |
US20020188442A1 (en) | 2002-12-12 |
FR2825826A1 (fr) | 2002-12-13 |
FR2825826B1 (fr) | 2003-09-12 |
EP1267325B1 (de) | 2004-06-16 |
US7596487B2 (en) | 2009-09-29 |
CN1162835C (zh) | 2004-08-18 |
ES2219624T3 (es) | 2004-12-01 |
DE60200632T2 (de) | 2004-12-23 |
CN1391212A (zh) | 2003-01-15 |
JP2003005772A (ja) | 2003-01-08 |
JP2006189907A (ja) | 2006-07-20 |
ATE269573T1 (de) | 2004-07-15 |
JP3992545B2 (ja) | 2007-10-17 |
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