EP1279164A1 - Procede de calcul d'une decision d'activite vocale (detecteur d'activite vocale) - Google Patents

Procede de calcul d'une decision d'activite vocale (detecteur d'activite vocale)

Info

Publication number
EP1279164A1
EP1279164A1 EP01933720A EP01933720A EP1279164A1 EP 1279164 A1 EP1279164 A1 EP 1279164A1 EP 01933720 A EP01933720 A EP 01933720A EP 01933720 A EP01933720 A EP 01933720A EP 1279164 A1 EP1279164 A1 EP 1279164A1
Authority
EP
European Patent Office
Prior art keywords
signal
signal section
stage
stationary
statl
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.)
Withdrawn
Application number
EP01933720A
Other languages
German (de)
English (en)
Inventor
Kyrill Alexander Fischer
Christoph Erdmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Telekom AG
Original Assignee
Deutsche Telekom AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE10026872A external-priority patent/DE10026872A1/de
Application filed by Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP1279164A1 publication Critical patent/EP1279164A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the present invention relates to a method for determining the speech activity in a signal section of an audio signal, the result as to whether speech activity is present in the signal section under consideration depends both on the spectral and on the temporal steadiness of the signal section and / or on previous signal sections.
  • CELP Code Excited Linear Prediction
  • the approximation describing the signal section is essentially obtained from three components that are used on the decoder side to reconstruct the signal: firstly, a filter that approximately describes the spectral structure of the respective signal section, secondly, a so-called excitation signal that is filtered by this filter and, thirdly, an amplification factor (“gain”) by which the excitation signal is multiplied before the filtering.
  • the amplification factor is responsible for the volume of the respective section of the reconstructed signal.
  • the result of this filtering then represents the approximation of the one to be transmitted For each section, the information about the filter settings and the information about the excitation signal to be used and its scaling ("gain”), which describes the volume, must be transmitted.
  • these parameters are taken from various, the encoder and decoder i n identical copies of existing codebooks are obtained, so that only the number of the most suitable codebook entries has to be transmitted for the reconstruction.
  • the most suitable codebook entries are to be determined for each section, whereby all relevant codebook entries are searched in all relevant combinations, and those entries are selected which deliver the smallest deviation from the original signal in terms of a reasonable distance measure.
  • VAD voice activity detection
  • the decision of the VAD is equated with a decision about the stationarity of the current signal, so that the extent of the change in the essential signal properties is used as the basis for determining the stationarity and the associated speech activity.
  • a signal area without speech which, for example, only has a consistently loud and spectrally unchanging or only slightly changing background noise, can be described as stationary.
  • a signal section with a speech signal (with and without the presence of the background noise) can be described as non-stationary, i.e. unsteady.
  • the result presented here is equated with the result "transient" with speech activity, while "stationary" means that there is no speech activity. Since the stationarity of a signal is not a clearly defined measurement variable, it is defined in more detail below.
  • the method presented here assumes that a determination of the stationarity should ideally be based on the temporal change in the short-term mean value of the energy of the signal.
  • the energy also depends on the absolute volume of the speaker, which should have no influence on the decision.
  • the energy value is also influenced, for example, by the background noise.
  • the use of a criterion based on energy considerations is only meaningful if the influence of these possible disruptive effects can be excluded. For this reason, the procedure is structured in two stages: In the first stage, a valid decision about the stationarity is made.
  • the filter describing this stationary signal section is recalculated and thus adapted to the last stationary signal.
  • this decision is made again according to another criteria, and is therefore checked and, if necessary, modified using the values provided in the first stage.
  • This second stage works using an energy measure.
  • the second level also provides a result that the first level takes into account when analyzing the subsequent language frame. In this way there is a feedback between these two stages, which ensures that the ones supplied by the first stage values form an optimal basis for the decision of the second stage.
  • the first stage is presented, which provides a first decision based on the investigation of the spectral stationarity. If one looks at the frequency spectrum of a signal section, it has a characteristic shape for the period under consideration. Is the change in the frequency spectra of temporally successive signal sections sufficiently small, i.e. the characteristic shape of the respective spectra is more or less preserved, so one can speak of spectral stationarity.
  • STAT1 The result of the first stage is called STAT1 and the result of the second stage is called STAT2.
  • STAT2 also corresponds to the final decision of the VAD procedure presented here.
  • This first stage of the stationarity process receives the following values as input values:
  • the first stage supplies the values as the initial value
  • the decision of the first stage is based primarily on the consideration of the so-called spectral distance ("spectral distance”, “spectral distortion”) between the current and the previous frame.
  • the decision also includes the values of a voicing measure that was calculated for the last frames.
  • the calculation is based on:
  • the value of SD is limited down to a minimum value of 1.6.
  • the value limited in this way is then saved as the current value in a list of the past values SD_MEM [0..9], the longest past value having been removed from the list beforehand.
  • VOICE [0..1] The results of a voicing measure (VOICE [0..1]) were also provided as an input value in the first stage. (These values are between 0 and 1 and were previously after
  • VOTE [0] for the first half of the frame
  • VOTE [1] for the second half of the frame. If VOICE [k] has a value close to 0, the signal is clearly unvoiced, while a value close to 1 characterizes a clearly voiced speech area. )
  • STIMM_MEM [] The last four values of STIMM_MEM [], namely the values STIMM_MEM [16] to STIMM_MEM [19] are averaged again and saved in STIMM4.
  • N_INSTAT2 If occasional unsteady frames have occurred during the analysis of the past frames, this is recognized by the value of N_INSTAT2. In this case, a transition to the "stationary" state occurred only a few frames ago.
  • TRES_SD_MEAN 4.0 (if N_INSTAT2> 0)
  • the second stage works using a list of linear prediction coefficients prepared in this stage, which describe the signal piece that was last classified as "stationary" by this stage.
  • LPC_STAT1 is overwritten by the current LPC_NOW (update):
  • the second stage uses the values as input variables
  • the second stage provides the values as the initial value
  • the temporal change in the energy of the residual signal is used, which was calculated with the LPC filter LPC_STAT1 [] adapted to the last stationary signal section and the current input signal SIGNAL []. Both an estimate of the last remaining signal energy E_RES_REF as the lower reference value and a previously selected tolerance value E_TOL are included in the decision. The current residual signal energy value is then no longer allowed as E_TOL are above the reference value E_RES_REF if the signal is to be regarded as "stationary".
  • the input signal SIGNAL [0 ... FRAME_LEN-1] of the current frame is inversely filtered using the linear prediction coefficients stored in LPC_STATl [0 .. ORDER-1].
  • the result of this filtering is referred to as a "residual signal" and stored in SPEECH_RES [0..FRAME_LEN-1].
  • E_RES total ⁇ SIGNAL_RES [k] * SIGNAL_RES [k] / FRAME_LEN ⁇ ,
  • E_RES 10 * log (E_RES / E_MAX),
  • SIGNAL_MAX describes the maximum possible amplitude value of a single sample. This value depends on the implementation environment; in the prototype on which the invention is based, it was, for example
  • SIGNAL_MAX 32767
  • SIGNAL_MAX 1.0
  • E_RES calculated in this way is expressed in dB with respect to the maximum value. It is therefore always below 0, typical values are around -100 dB for signals with very low energy and around -30 dB for signals with comparatively high energy.
  • the energy of the residual signal By using the energy of the residual signal, an adaptation is implicitly made to the spectral form that was last classified as stationary. If the current signal has changed compared to this spectral form, the residual signal will have a measurably higher energy than in the case of an unchanged, uniformly continued signal.
  • E_RES_REF envelope frequency response described by LPC_STAT1 [] of the frame last classified as "stationary” by the first stage
  • E_RES_REF This value is called E_RES_REF. It is always redefined here when the first stage has classified the current frame as "stationary". In this case, the previously calculated value E_RES is used as the new value for this reference energy E_RES_REF:
  • E_RES_REF E_RES if
  • STAT1 "stationary", because the tolerance value of 12dB is deliberately chosen generously.
  • the other conditions are special cases; they ensure an adjustment at the beginning of the algorithm and a re-estimation at very low input values, which should in any case serve as a new reference value for stationary signal sections.
  • the tolerance value E_T0L specifies for the decision criterion a maximum permitted change in the energy of the physical signal compared to that of the previous frames, so that the current frame can be considered to be "stationary".
  • E TOL 6. 5
  • the first condition ensures that it is very easy to leave a stationarity that has existed only for a short time, since the low tolerance E_TOL makes it easier to decide on "unsteady”.
  • the other cases include adjustments that provide the most favorable values for different special cases (sections with very low energy should be classified more heavily as “unsteady”, sections with comparatively high energy should be classified more easily as “unsteady”).
  • the counter of the past stationary frames N_STAT2 is therefore set to 0 immediately when a transient frame occurs, while the counter for the past transient frames N_INSTAT2 only after a certain number (in the implemented prototype: 16) of successive stationary frames to 0 is set.
  • N_INSTAT2 is used as the input value of the first stage and influences the decision of the first stage. Specifically, N_INSTAT2 prevents the first stage from redetermining the coefficient set LPC_STAT1 [] describing the envelope spectrum before it is ensured that a new stationary signal section actually exists.
  • Short-term or isolated STAT2 "stationary” decisions can occur, but only after a certain number of consecutive frames classified as "stationary” is the coefficient set LPC_STATl [] describing the envelope spectrum for the stationary signal section then present newly determined in the first stage Right.
  • STAT1 unsteady "decision of the first stage
  • Threshold values and functions are only examples and usually have to be found out by own experiments.

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)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de détermination de l'activité vocale dans une portion de signal d'un signal audio. Le résultat, c.-à-d. la présence d'une activité vocale dans la portion de signal concernée, dépend de la stationnarité spectrale et temporelle de la portion de signal et/ou de portions de signal antérieures. Ledit procédé consiste à détecter, dans une première étape, la présence de stationnarité spectrale dans la portion de signal concernée, et à détecter, dans une deuxième étape, la présence de stationnarité temporelle dans la portion de signal concernée, la décision finale concernant la présence d'activité vocale dans la portion de signal concernée dépendant des valeurs initiales des deux étapes.
EP01933720A 2000-04-28 2001-03-16 Procede de calcul d'une decision d'activite vocale (detecteur d'activite vocale) Withdrawn EP1279164A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10020863 2000-04-28
DE10020863 2000-04-28
DE10026872A DE10026872A1 (de) 2000-04-28 2000-05-31 Verfahren zur Berechnung einer Sprachaktivitätsentscheidung (Voice Activity Detector)
DE10026872 2000-05-31
PCT/EP2001/003056 WO2001084536A1 (fr) 2000-04-28 2001-03-16 Procede de calcul d'une decision d'activite vocale (detecteur d'activite vocale)

Publications (1)

Publication Number Publication Date
EP1279164A1 true EP1279164A1 (fr) 2003-01-29

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EP01933720A Withdrawn EP1279164A1 (fr) 2000-04-28 2001-03-16 Procede de calcul d'une decision d'activite vocale (detecteur d'activite vocale)

Country Status (3)

Country Link
US (1) US7254532B2 (fr)
EP (1) EP1279164A1 (fr)
WO (1) WO2001084536A1 (fr)

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US7254532B2 (en) 2007-08-07

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