EP1288914B1 - Procédé pour la correction de mesures de la qualité vocale - Google Patents

Procédé pour la correction de mesures de la qualité vocale Download PDF

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Publication number
EP1288914B1
EP1288914B1 EP02012790A EP02012790A EP1288914B1 EP 1288914 B1 EP1288914 B1 EP 1288914B1 EP 02012790 A EP02012790 A EP 02012790A EP 02012790 A EP02012790 A EP 02012790A EP 1288914 B1 EP1288914 B1 EP 1288914B1
Authority
EP
European Patent Office
Prior art keywords
speech
speech quality
value
correction
quality
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.)
Expired - Lifetime
Application number
EP02012790A
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German (de)
English (en)
Other versions
EP1288914A2 (fr
EP1288914A3 (fr
Inventor
Jens Dr. Berger
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
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Filing date
Publication date
Application filed by Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP1288914A2 publication Critical patent/EP1288914A2/fr
Publication of EP1288914A3 publication Critical patent/EP1288914A3/fr
Application granted granted Critical
Publication of EP1288914B1 publication Critical patent/EP1288914B1/fr
Anticipated expiration legal-status Critical
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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
    • G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
    • G10L25/69—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for evaluating synthetic or decoded 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
    • 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
    • G10L2021/02168—Noise filtering characterised by the method used for estimating noise the estimation exclusively taking place during speech pauses

Definitions

  • the invention relates to instrumental methods for measuring the speech quality of recorded or transmitted speech signals. It is based on voice quality metrics assumed that e.g. with the ITU-T standard P.862 ("Perceptual Evaluation of Speech Quality (PESQ), an Objective Method for end-to-end Speech Quality Assessment of Narrow-band Telephone Networks and Speech Codecs ", ITU-T, Geneva, 2001) become.
  • P.862 Perceptual Evaluation of Speech Quality (PESQ), an Objective Method for end-to-end Speech Quality Assessment of Narrow-band Telephone Networks and Speech Codecs
  • the perceived speech quality z. B. in telephone or broadcasting is mainly caused by speech-simultaneous disturbances, ie disturbances during the Voice activity, determined. But also noises in speech pauses go into that Quality judgment, especially with high quality voice reproduction quality.
  • Speech quality determinations of speech signals are usually auditory ("subjective") investigations carried out with test subjects.
  • the goal of instrumental ("objective") speech quality assessment procedures are out Properties of the speech signal to be evaluated by means of suitable calculation methods To determine characteristic values that determine the speech quality of the speech signal to be evaluated describe without having to resort to judgments from test subjects.
  • Known methods for instrumental determination of speech quality determine the voice quality based on a comparison between undisturbed reference speech signal (source speech signal) and the to be evaluated and possibly disturbed signal.
  • Such measuring methods are used in so-called sample connection systems, in where a known reference speech signal (source speech signal) is input to the source and z. B. transmitted over a telephone connection and recorded on the sink. After Recording of the speech signal is the calculation of a speech quality value.
  • source speech signal source speech signal
  • Instrumental methods for speech quality determination are usually limited to the Evaluation of sections with voice activity.
  • the current ITU-T standard P.862 is also restricted to sections when determining the speech quality active language. Especially with high quality speech and sounds, the occur exclusively in speech pauses, provide these methods (eg ITU-T Rec. P.862) unreliable quality values.
  • the voice quality is here too evaluated optimistically, since the perceived by a listener voice quality on the whole signal including possible noises in the speech pauses relates.
  • Some instrumental methods for speech quality determination such. B. the method according to ITU-T Rec. P.862, take into account the calculation of the speech quality values Noises in the speech pauses not. The resulting readings are thereby especially at high quality playback in voice activity but occurring noises in speech breaks, unreliable. With the present method, the background noise be taken into account in the speech pauses in determining the speech quality values.
  • the solution of the problem as defined in claim 1 assumes that the background noise in the Speech pauses regarding their disturbing influence on the perceived speech quality be rated. For this purpose, intensity characteristic values of the background noise are determined and with these values, the speech quality measurements made by an instrumental Method, for. B. ITU-T Rec. P.862, were corrected corrected.
  • the voice quality value is obtained by using the source voice signal and the evaluating disturbed speech signal, z.
  • the method of ITU-T Rec. P.962 calculated.
  • These speech signals are also available to the subsequent correction process Input parameters available.
  • the correction method described here requires nor the calculated speech quality value, the z. B. with the method according to ITU-T Rec. P.862 was calculated.
  • one or more intensity characteristics are obtained of the noise in speech pauses.
  • This can be z.
  • the average loudness according to ISO 532 of the background noise in speech pauses A very efficient process for this is described in the patent application DE 101 20 168.
  • other intensity characteristics e.g. Sharpness, impulsiveness, fluctuation strength
  • Sharpness, impulsiveness, fluctuation strength can be included in the correction value. It It is assumed that increasing intensity characteristics of one as well Increasing noise caused by the noise in speech breaks and thus too lead to a greater reduction in perceived speech quality.
  • the voice quality is rated too high by the speech quality measurement methods described with good speech reproduction quality and simultaneous noises in the speech pauses.
  • One or more background noise intensity values in speech pauses are used to correct the measured speech quality value. Assuming that the measured speech quality score is on a scale from 1 (low quality) to 5 (very good quality) according to ITU-T Recommendation P.800 ("Methods for objective and subjective assessment of quality", ITU-T, Geneva 1996 ), all values above a certain speech quality threshold (eg, in the method of ITU-T Rec. P.862 above 3.0) are reduced when background noise occurs in speech pauses.
  • This reduction is dependent on the intensity characteristics of the background noise, the proportion of speech pauses in the total signal PA and the speech quality value Y.
  • a general description of this correction is for all speech quality values Y above a speech quality threshold YS in which only one intensity score (here N) is taken into account. This can be z.
  • the function a (N) represents a unique and increasing weighting function of the intensity parameter N.
  • the corrected speech quality value is always less than or equal to the uncorrected value.
  • the correction is small if the intensity of the noise is low ( N is small), there are few speech pauses ( PA small) or the speech quality value is close to the speech quality threshold ( Y-YS small). More correct is when strong pauses sound with otherwise high voice quality Y occur.
  • the intensity characteristics are weighted with the weighting functions a (N), b (M) and c (O), respectively. Since an increasing disturbance with increasing values is assumed, here also clear and increasing weighting functions are to be set.
  • the exemplary embodiment presented here shows, by way of example, a correction of the speech quality values determined using the method according to ITU-T Rec. P.862 "PESQ" (as of 2001).
  • This method provides a speech quality value by comparing an undisturbed source speech signal with the disturbed speech signal to be evaluated. These two speech signals are used to determine the average loudness of the background noise according to patent application DE 101 20 168.
  • the thus calculated value N in sone is used to correct the quality value calculated by the method according to ITU-T Rec. P.862 "PESQ" (state 2001) used.
  • the value of the threshold excess YD is determined, ie by what proportion the measured speech quality Y exceeds the speech quality threshold YS .

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)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Noise Elimination (AREA)

Claims (2)

  1. Procédé destiné à la correction de valeurs mesurées de la qualité de la parole, les valeurs mesurées de la qualité de la parole étant déterminées à l'aide de procédés instrumentaux n'exploitant que les segments du signal avec activité vocale, dans lequel :
    les bruits présents dans les pauses vocales sont pris en considération dans la détermination des valeurs de la qualité de la parole,
    pour cela l'intensité des bruits de fond dans les pauses vocales est déterminée et ces valeurs caractéristiques sont utilisées pour la correction des valeurs mesurées de la qualité de la parole, et
    la correction est effectuée de telle sorte que la valeur mesurée de la qualité de la parole soit réduite d'une valeur calculée à partir d'un ou plusieurs indicateurs pondérés de l'intensité des bruits de fond, du nombre de pauses vocales dans le signal vocal à évaluer et de la valeur mesurée de la qualité de la parole.
  2. Procédé selon la revendication 1, caractérisé en ce que la correction des valeurs de la qualité de la parole mesurées selon la recommandation P.862 de l'UIT-T est effectuée de telle sorte que la puissance du son moyenne dans les pauses vocales soit déterminée comme indicateur de l'intensité, que la valeur retenue pour le calcul de la correction soit celle dépassant la valeur de seuil de 1,3 sones et limitée à 4,0 sones et que cette valeur soit multipliée par un facteur constant (0,45), le nombre de pauses vocales dans le signal entier et le nombre de valeurs mesurées de la qualité de la parole, dépassant la valeur de seuil de la qualité de la parole de 3,0 et donnant une valeur de correction qui est soustraite de la valeur mesurée de la qualité de la parole afin de déterminer la valeur corrigée de la qualité de la parole.
EP02012790A 2001-08-29 2002-06-10 Procédé pour la correction de mesures de la qualité vocale Expired - Lifetime EP1288914B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10142846A DE10142846A1 (de) 2001-08-29 2001-08-29 Verfahren zur Korrektur von gemessenen Sprachqualitätswerten
DE10142846 2001-08-29

Publications (3)

Publication Number Publication Date
EP1288914A2 EP1288914A2 (fr) 2003-03-05
EP1288914A3 EP1288914A3 (fr) 2004-05-19
EP1288914B1 true EP1288914B1 (fr) 2005-12-21

Family

ID=7697364

Family Applications (1)

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EP02012790A Expired - Lifetime EP1288914B1 (fr) 2001-08-29 2002-06-10 Procédé pour la correction de mesures de la qualité vocale

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EP (1) EP1288914B1 (fr)
AT (1) ATE313846T1 (fr)
DE (2) DE10142846A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2944640A1 (fr) 2009-04-17 2010-10-22 France Telecom Procede et dispositif d'evaluation objective de la qualite vocale d'un signal de parole prenant en compte la classification du bruit de fond contenu dans le signal.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI94810C (fi) * 1993-10-11 1995-10-25 Nokia Mobile Phones Ltd Menetelmä huonon GSM-puhekehyksen tunnistamiseksi
US5684921A (en) * 1995-07-13 1997-11-04 U S West Technologies, Inc. Method and system for identifying a corrupted speech message signal
US5809414A (en) * 1995-11-22 1998-09-15 Northern Telecom Limited User out-of-range indication for digital wireless systems
SE506341C2 (sv) * 1996-04-10 1997-12-08 Ericsson Telefon Ab L M Metod och anordning för rekonstruktion av en mottagen talsignal
EP0980064A1 (fr) * 1998-06-26 2000-02-16 Ascom AG Méthode pour effectuer une évaluation automatique de la qualité de transmission de signaux audio
DE19840548C2 (de) * 1998-08-27 2001-02-15 Deutsche Telekom Ag Verfahren zur instrumentellen Sprachqualitätsbestimmung
GB9911777D0 (en) * 1999-05-20 1999-07-21 Univ Southampton Transceiver

Also Published As

Publication number Publication date
DE50205328D1 (de) 2006-01-26
ATE313846T1 (de) 2006-01-15
DE10142846A1 (de) 2003-03-20
EP1288914A2 (fr) 2003-03-05
EP1288914A3 (fr) 2004-05-19

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