EP0874352A2 - Sprachaktivitätserkennung - Google Patents
Sprachaktivitätserkennung Download PDFInfo
- Publication number
- EP0874352A2 EP0874352A2 EP98102842A EP98102842A EP0874352A2 EP 0874352 A2 EP0874352 A2 EP 0874352A2 EP 98102842 A EP98102842 A EP 98102842A EP 98102842 A EP98102842 A EP 98102842A EP 0874352 A2 EP0874352 A2 EP 0874352A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- speech
- output
- switch
- background noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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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
- G10L25/27—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the analysis technique
Definitions
- the invention relates to a method and Circuit arrangement for automatic Voice activity recognition according to the generic term of Claims 1 and 5 respectively.
- Known methods for automatic Speech activity detection usually use Decision parameters based on time averages Based windows of constant length.
- the autocorrelation coefficients Called zero crossing rate or basic speech period, where these parameters have limited flexibility in the Have selection of time / frequency domain resolution, which is usually determined by the frame length of the associated Speech encoder / decoder is fixed.
- the well-known wavelet transformation calculates a breakdown into the time / frequency domain too low frequency but high time domain resolution at high frequencies and too low time - but high Frequency domain resolution at low frequencies leads.
- the invention is therefore based on the object Method and a circuit arrangement for Voice activity detection based on the wavelet transformation to create, it should be decided whether language for the time segment to be considered at all or speech sounds.
- the present procedure for automatic Speech activity detection for speech encoders / decoders for source-controlled reduction of the middle one Transmission rate is characterized in that after the Segmentation of the speech signal for each frame one Wavelet transformation is calculated from the one sentence Parameters are determined from which using fixed Thresholds are calculated using a set of binary decision variables that control a decision logic, the result After smoothing the time, a statement for each frame "Language available / no language available" returns. In that it is determined whether for the contemplating time segment there is language at all a source-controlled reduction of the middle one Transfer rate reached.
- the procedure decides whether to do so contemplating time segment there is language at all. This allows it to function control or in general as Preliminary stage for a variable-rate speech coder / decoder Bit rate can be used.
- 1 is a block diagram for voice activity recognition as a preliminary stage for one variable rate speech encoder / decoder shown on its input 1 receives the respective input language.
- the input language is both on lines 2 and 3 a switch 4 as well as the input of a Voice activity detection circuit or module 5 given.
- the switch 4 directs the input language depending on the output signal of the voice activity detection circuit 5, which is used to control the switch 4 is connected to it via a feedback line 6, either on line 7 or on line 8. Die Line 7 leads to a speech encoder 9 and the line 8 to a background noise encoder 10.
- the bit stream of the speech encoder 9 is connected via a line 11 to the given an input of a switch 13 and the bit stream the background noise encoder 10 via a line 12 to the other input of the switch 13.
- the switch 13 also receives the output signals via a line 14 the voice activity detection circuit 5, whereby the Switch 13 is controlled.
- the output of the switch 13 is connected to a transmission channel 16 via a line 15 connected, also on the input side to line 14 for the output signals of the voice activity detection module 5 is connected.
- the output of the transmission channel 16 reaches the entrance once via a line 17 a further switch 19 and via a line 18 the control input of the switch 19 and the control input a switch 26.
- the switch 19 is over Output lines 20 and 21 with a speech decoder 22 and with a background noise decoder 23 connected, the outputs on lines 24 and 25 on the Get input of the switch 26 already mentioned, the depending on the control signals on line 18 at the output 27 either signals for the decoded speech or the provides decoded background noise.
- FIG. 2 is a block diagram of an automatic Voice activity recognizer represented, which in turn on its input 1 receives the input language and to one Segmentation circuit 28 passes on.
- the exit of this Segmentation circuit 28 is connected via a line 29 transmit a wavelet transform circuit 30 which again via a line 31 with the input of a Processor 32 connected to calculate the energy quantities is.
- the output of processor 32 or one Computing circuit is connected in parallel with a via a line 33 Pause detector 34, with a circuit for calculating a Stationarity measure 35, with a first Background detector 36 and with a second Background detector 37 connected.
- the outputs of the mentioned circuits 34 to 37 are about corresponding Lines 38 to 41 with decision logic 42 connected, the output via a line 43 with a Smoothing circuit 44 connected for temporal smoothing whose output 45 is also the output of the speech activity recognizer is.
- the M 2 L-2 past and the M 2 L-2 future samples of the speech frame are also taken into account and the filter impulse responses - as far as possible - centered around the temporal origin. This increases the algorithmic delay of the method in principle by M 2 L-2 samples. If this is to be avoided, the input frame can alternatively be continued periodically or symmetrically.
- the frame energies E 1 ..., E L of the detail coefficients D 1 , ..., D L and the frame energy E L + 1 of the approximation coefficients A L are calculated by the processor 32.
- the total energy of the frame E tot can now be determined efficiently by summing all partial energies if the underlying wavelet basis is orthogonal. All energy values are represented in the logarithmic range.
- a binary decision variable f sil is set according to the following formula:
- the binary decision variable f stat is now set using the threshold T 2 taking into account the last K frames:
- the goal is to obtain a decision criterion that is insensitive to the current level of background noise.
- the properties of the DWT or wavelet transformation circuit 30 are used efficiently for this by considering the detail coefficients D Q1 in the coarse time interval N and the detail coefficients D Q2 in the finer time interval N / P.
- P denotes the number of subframes, Q1 a level for coarse and Q2 a level for fine time resolution, whereby the relationships Q1, Q2 ⁇ ⁇ 1, L ⁇ and Q1> Q2 must apply.
- an estimate B i , i ⁇ ⁇ Q1, Q2 ⁇ for the current level of the background noise is carried out for both stages calculated, the time constant ⁇ being limited by 0 ⁇ ⁇ 1.
- the P subframe energies ⁇ ( k ,1) Q2 , ..., ⁇ ( k , P ) Q2 determined from the detailed coefficients D 2 and, using the fixed thresholds T 3 and T 4, each determine a binary decision variable f Q1 for stage Q1 and f Q2 for stage Q2 according to the following two formulas:
- the temporal smoothing takes place in the circuit 44.
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Time-Division Multiplex Systems (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
Description
- Fig. 1
- ein Blockschaltbild für die Sprachaktivitätserkennung als Vorstufe für einen variabelratigen Sprachcodierer-/decodierer und
- Fig. 2
- ein Blockschaltbild eines automatischen Sprachaktivitätserkenners.
- 1
- Eingang
- 2,3
- Leitungen
- 4
- Umschalter
- 5
- Sprachaktivitätserkennungsmodul oder -schaltung
- 6
- Rückmeldeleitung
- 7,8
- Leitungen bzw. Ausgänge des Umschalters 4
- 9
- Sprachcodierer
- 10
- Hintergrundgeräuschcodierer
- 11,12
- Leitungen
- 13
- Umschalter
- 14,15
- Leitungen
- 16
- Übertragungskanal
- 17,18
- Leitungen
- 19
- Umschalter
- 20,21
- Leitungen
- 22
- Sprachdecodierer
- 23
- Hintergrundgeräuschdecodierer
- 24,25
- Leitungen
- 26
- Umschalter
- 27
- Ausgang
- 28
- Segmentierer
- 29,31,33
- Leitungen
- 30
- Wavelet-Transformationsschaltung 32 Prozessor
- 34
- Phasendetektor
- 35
- Schaltung zur Ermittlung für das Stationaritätsmaß
- 36,37
- Hintergrunddetektor
- 38 - 41
- Leitungen
- 42
- Entscheidungslogik
- 43
- Leitung
- 44
- Glättungsschaltung
- 45
- Ausgang
Claims (6)
- Verfahren zur automatischen Sprachaktivitätserkennung auf Basis der Wavelet-Transformation, dadurch gekennzeichnet,daß zur quellengesteuerten Reduktion der mittleren Übertragungsrate eine Sprachaktivitätserkennungsschaltung bzw. ein -modul (5) zur Steuerung eines Sprachcodierers (7) und eines Sprachdecodierers (22) sowie zur Steuerung eines Hintergrundgeräuschcodierers (10) und eines Hintergrundgeräuschdecodierers (23) dient, wobei nach der Segmentierung eines Sprachsignals für jeden Rahmen eine Wavelet-Transformation berechnet wird, aus der ein Satz Parameter ermittelt wird, aus denen mit Hilfe fester Schwellen ein Satz binärer Entscheidungsvariablen in einer Rechenschaltung oder einem Prozessor (32) berechnet wird, die eine Entscheidungslogik (42) steuern, deren Resultat nach zeitlicher Glättung für jeden Rahmen eine Aussage "Sprache vorhanden / keine Sprache" liefert.
- Verfahren zur Sprachaktivitätserkennung nach Patentanspruch 1, dadurch gekennzeichnet,daß nach der Wavelet-Transformation für jedes Segment ein Satz von Energieparametern aus den Transformationskoeffizienten ermittelt und mit festen Schwellwerten verglichen wird, wodurch binäre Entscheidungsvariablen entstehen, mit denen die Entscheidungslogik (42) gesteuert wird, die ein vorläufiges Resultat für jeden Rahmen am Ausgang abgibt.
- Verfahren zur Sprachaktivitätserkennung nach einem der Patentansprüche 1 oder 2, dadurch gekennzeichnet,daß das vorläufige Resultat für jeden Rahmen, das von der Entscheidungslogik ermittelt wird, mittels zeitlicher Glättung nachverarbeitet wird, wodurch das endgültige Resultat "Sprache vorhanden oder keine Sprache" für den jeweils aktuellen Rahmen gebildet wird.
- Verfahren zur Sprachaktivitätserkennung nach einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet,daß zur Detektion von Hintergrundrauschen Hintergrundgeräuschdetektoren (36 und 37) mit Signalen gesteuert werden und die Detailkoeffizienten (D) im groben Zeitintervall (N) und Detailkoeffizienten (D2) im feineren Zeitintervall (N/P) analysiert werden, wobei P die Anzahl der Subrahmen darstellt und die Beziehungen Q1,Q2∈{1,L} sowie Q1>Q2 gelten.
- Schaltungsanordnung zur Durchführung des Verfahrens zur Sprachaktivitätserkennung nach einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet,daß auf den Eingang (1) eines Umschalters (4) die Signale der Eingangssprache gelangen,daß mit dem Eingang (1) eine Sprachaktivitätserkennungsschaltung bzw. ein -modul (5) verbunden ist, deren Ausgang den genannten Umschalter (4), einen weiteren Umschalter (13) steuert und außerdem mit einem Übertragungskanal (16) verbunden ist,daß der Ausgang des Umschalters (4) über Leitungen (7 bzw. 8) mit einem Sprachcodierer (9) bzw. mit einem Hintergrundgeräuschcodierer (10) verbunden ist, deren Ausgänge über Leitungen (11 bzw. 12) mit den Eingängen des Umschalters (13) verbunden sind, dessen Ausgang über eine Leitung (15) mit dem Eingang des Übertragungskanals (16) verbunden ist, der einerseits mit einem weiteren Umschalter (19) und andererseits über eine Leitung (18) zur Steuerung des Umschalters (19) und zur Steuerung eines am Ausgang (27) angeordneten Umschalters (26) verbunden ist, unddaß zwischen den beiden Umschaltern (19 bzw. 26) ein Sprachdecodierer (22) und ein Decodierer (23) für Hintergrundgeräusche angeordnet ist.
- Schaltungsanordnung zur Durchführung des Verfahrens nach einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet,daß der Eingang (1) mit einer Segmentierungsschaltung (28) verbunden ist, deren Ausgang über eine Leitung (29) mit einer Wavelet-Transformationsschaltung (30) verbunden ist, die mit dem Eingang einer Rechenschaltung bzw. eines Prozessors (32) zur Berechnung der Energiegrößen verbunden ist,daß der Ausgang des Prozessors (32) über eine Leitung (33) parallel mit einem Pausendetektor (34), mit einer Schaltung zur Berechnung eines Stationaritätsmaßes (35), mit einem ersten Hintergrunddetektor (36) und mit einem zweiten Hintergrunddetektor (37) verbunden ist,daß die Ausgänge der genannten Schaltungen (34 bis 37) mit einer Entscheidungslogik (42) verbunden sind, deren Ausgang mit einer Glättungsschaltung (44) zur zeitlichen Glättung verbunden ist, unddaß der Ausgang der Glättungsschaltung (44) auch der Ausgang (45) des Sprachaktivitätserkenners ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19716862 | 1997-04-22 | ||
| DE19716862A DE19716862A1 (de) | 1997-04-22 | 1997-04-22 | Sprachaktivitätserkennung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0874352A2 true EP0874352A2 (de) | 1998-10-28 |
| EP0874352A3 EP0874352A3 (de) | 1999-06-02 |
| EP0874352B1 EP0874352B1 (de) | 2003-10-15 |
Family
ID=7827317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98102842A Expired - Lifetime EP0874352B1 (de) | 1997-04-22 | 1998-02-19 | Sprachaktivitätserkennung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6374211B2 (de) |
| EP (1) | EP0874352B1 (de) |
| AT (1) | ATE252265T1 (de) |
| DE (2) | DE19716862A1 (de) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10026872A1 (de) * | 2000-04-28 | 2001-10-31 | Deutsche Telekom Ag | Verfahren zur Berechnung einer Sprachaktivitätsentscheidung (Voice Activity Detector) |
| EP1279164A1 (de) | 2000-04-28 | 2003-01-29 | Deutsche Telekom AG | Verfahren zur berechnung einer sprachaktivitätsentscheidung (voice activity detector) |
| US7505594B2 (en) * | 2000-12-19 | 2009-03-17 | Qualcomm Incorporated | Discontinuous transmission (DTX) controller system and method |
| US6725191B2 (en) * | 2001-07-19 | 2004-04-20 | Vocaltec Communications Limited | Method and apparatus for transmitting voice over internet |
| US8315865B2 (en) * | 2004-05-04 | 2012-11-20 | Hewlett-Packard Development Company, L.P. | Method and apparatus for adaptive conversation detection employing minimal computation |
| US7574353B2 (en) * | 2004-11-18 | 2009-08-11 | Lsi Logic Corporation | Transmit/receive data paths for voice-over-internet (VoIP) communication systems |
| US7983922B2 (en) * | 2005-04-15 | 2011-07-19 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Apparatus and method for generating multi-channel synthesizer control signal and apparatus and method for multi-channel synthesizing |
| KR100655953B1 (ko) * | 2006-02-06 | 2006-12-11 | 한양대학교 산학협력단 | 웨이블릿 패킷 변환을 이용한 음성 처리 시스템 및 그 방법 |
| US7680657B2 (en) * | 2006-08-15 | 2010-03-16 | Microsoft Corporation | Auto segmentation based partitioning and clustering approach to robust endpointing |
| KR100789084B1 (ko) | 2006-11-21 | 2007-12-26 | 한양대학교 산학협력단 | 웨이블릿 패킷 영역에서 비선형 구조의 과중 이득에 의한음질 개선 방법 |
| US9361883B2 (en) * | 2012-05-01 | 2016-06-07 | Microsoft Technology Licensing, Llc | Dictation with incremental recognition of speech |
| CN104019885A (zh) | 2013-02-28 | 2014-09-03 | 杜比实验室特许公司 | 声场分析系统 |
| EP2974253B1 (de) | 2013-03-15 | 2019-05-08 | Dolby Laboratories Licensing Corporation | Normalisierung von schallfeldausrichtungen auf basis von auditorischer szenenanalyse |
| US10917611B2 (en) | 2015-06-09 | 2021-02-09 | Avaya Inc. | Video adaptation in conferencing using power or view indications |
| EP3800640B1 (de) * | 2019-06-21 | 2024-10-16 | Shenzhen Goodix Technology Co., Ltd. | Verfahren, vorrichtung und chip zur sprachdetektion |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5152007A (en) * | 1991-04-23 | 1992-09-29 | Motorola, Inc. | Method and apparatus for detecting speech |
| GB2272554A (en) * | 1992-11-13 | 1994-05-18 | Creative Tech Ltd | Recognizing speech by using wavelet transform and transient response therefrom |
| US5388182A (en) * | 1993-02-16 | 1995-02-07 | Prometheus, Inc. | Nonlinear method and apparatus for coding and decoding acoustic signals with data compression and noise suppression using cochlear filters, wavelet analysis, and irregular sampling reconstruction |
| US5459814A (en) * | 1993-03-26 | 1995-10-17 | Hughes Aircraft Company | Voice activity detector for speech signals in variable background noise |
| JP3090842B2 (ja) * | 1994-04-28 | 2000-09-25 | 沖電気工業株式会社 | ビタビ復号法に適応した送信装置 |
| FR2727236B1 (fr) * | 1994-11-22 | 1996-12-27 | Alcatel Mobile Comm France | Detection d'activite vocale |
| US5822726A (en) * | 1995-01-31 | 1998-10-13 | Motorola, Inc. | Speech presence detector based on sparse time-random signal samples |
| ES2165933T3 (es) * | 1995-06-30 | 2002-04-01 | Deutsche Telekom Ag | Procedimiento y dispositivo de clasificacion de las señales del habla. |
| DE19538852A1 (de) * | 1995-06-30 | 1997-01-02 | Deutsche Telekom Ag | Verfahren und Anordnung zur Klassifizierung von Sprachsignalen |
| CA2188369C (en) * | 1995-10-19 | 2005-01-11 | Joachim Stegmann | Method and an arrangement for classifying speech signals |
-
1997
- 1997-04-22 DE DE19716862A patent/DE19716862A1/de not_active Ceased
-
1998
- 1998-02-19 DE DE59809897T patent/DE59809897D1/de not_active Expired - Lifetime
- 1998-02-19 EP EP98102842A patent/EP0874352B1/de not_active Expired - Lifetime
- 1998-02-19 AT AT98102842T patent/ATE252265T1/de active
- 1998-04-22 US US09/064,248 patent/US6374211B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US6374211B2 (en) | 2002-04-16 |
| ATE252265T1 (de) | 2003-11-15 |
| DE59809897D1 (de) | 2003-11-20 |
| EP0874352A3 (de) | 1999-06-02 |
| DE19716862A1 (de) | 1998-10-29 |
| US20010014854A1 (en) | 2001-08-16 |
| EP0874352B1 (de) | 2003-10-15 |
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