EP1048025B1 - Verfahren zur instrumentellen sprachqualitätsbestimmung - Google Patents
Verfahren zur instrumentellen sprachqualitätsbestimmung Download PDFInfo
- Publication number
- EP1048025B1 EP1048025B1 EP99942871A EP99942871A EP1048025B1 EP 1048025 B1 EP1048025 B1 EP 1048025B1 EP 99942871 A EP99942871 A EP 99942871A EP 99942871 A EP99942871 A EP 99942871A EP 1048025 B1 EP1048025 B1 EP 1048025B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spectral
- computed
- speech signal
- evaluated
- signal
- 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
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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 OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
Definitions
- the invention relates to a method for instrumental ("objective") Speech quality determination, by comparing the properties of one evaluating speech signal with properties of a reference speech signal (undisturbed Signal) characteristic values for determining the speech quality (speech quality) can be derived.
- Speech quality determinations of speech signals are generally made using auditory ("subjective") investigations with test persons.
- the goal of instrumental ("objective") procedures for determining speech quality is it, from properties of the speech signal to be evaluated by means of suitable computing methods To determine characteristic values that determine the speech quality of the speech signal to be assessed describe without having to resort to judgments from test subjects.
- the calculated characteristic values and the underlying method for instrumental Speech quality assessment is considered recognized if there is a high correlation Results of auditory comparative examinations is achieved.
- the means of auditory Examinations of speech quality values thus represent the target values that to be achieved through instrumental procedures.
- Known methods for instrumental speech quality determination are based on a comparison of a reference speech signal with the speech signal to be evaluated.
- the reference speech signal and the speech signal to be evaluated are segmented into short time segments.
- the spectral properties of the two signals are compared in these segments.
- Various approaches and models are used to calculate the spectral short-term properties.
- the signal intensity is calculated in frequency bands whose width increases with increasing center frequency. Examples of such frequency bands are the known third octave bands or frequency groups according to Zwicker (published in Zwicker, E .: “Psychoakustik", Berlin: Springer-Verlag, 1982).
- the spectral intensity map calculated in this way for each period of time under consideration can be understood as a series of numerical values in which the number of individual values of the The number of frequency bands used corresponds to the numerical values even the calculated ones Represent intensity values and a continuous index of the frequency bands the order which describes numerical values.
- the calculated intensities are to be evaluated Voice signal and reference voice signal compared in each band.
- the difference both values, or the similarity of the two resulting spectral values Intensity maps, is the basis for the calculation of a quality value (Fig. 1).
- a disadvantage of the methods known today in such cases is that a comparison differences between the speech signal to be evaluated with a reference speech signal between the two signal sections in the selected display level in the calculative quality parameter that does not or hardly at all - also in audible test perceptible - lead to qualitative impairment.
- Frequency band limits and spectral deformations of the speech signal to be evaluated contributes only to a limited extent to a perceived qualitative impairment.
- the invention has as its object the influence of spectral limits and Deformations of the speech signal to be assessed and of spectral shifts Short-term maxima before comparing the spectral properties of a test item Signal with a reference speech signal and the calculation of a quality value in to reduce instrumental procedures.
- one is used in the invention described here generated spectral weighting function based on medium spectral envelopes, e.g. the average spectral power density, of the speech signal to be evaluated and Reference speech signal based. This also enables the use of the method non-linear and time-variant transmission.
- the evaluation function a (f) can weight the weighting function W T (f) differently over the effective range, in the simplest case it is constant 1.
- the spectral weighting function W T (f) calculated in this way approximates the mean spectral envelopes of the speech signal and the reference speech signal to be evaluated, so that differences between the two spectral envelopes only have a reduced effect on the calculated quality value.
- the spectral weighting function W T (f) can be applied to the reference speech signal.
- the average spectral power density of the reference speech signal is approximated to the signal to be evaluated (FIG. 2a).
- the spectral weighting function can be inverted to the signal to be evaluated be applied. This is equalized and, with regard to its middle one spectral power density, approximated to the reference speech signal (Fig. 2b).
- Another part of the invention relates to the correction of displacements short-term spectral maxima caused by the transmission systems.
- the intensity is integrated in frequency bands for each time period.
- the result is one Series of intensity values for each spectral representation of a signal section, where each individual value represents the intensity in a frequency band.
- the shifts Short-term spectral maxima can lead to deviating calculated intensities in the frequency bands of the reference speech signal and the speech signal to be evaluated.
- variable band limits for calculating the spectral intensity mapping is not only limited to the signal in which the described spectral weighting function W T (f) is also used, but can also be applied to the other signal and even to both signals. (see FIGS. 2a and 2b).
- a special embodiment shows an implementation according to FIG. 3, which is called TOSQA (Telecommunication Objective Speech Quality Assessment). This is done advanced preprocessing of the reference speech signal.
- TOSQA Telecommunication Objective Speech Quality Assessment
- Speech pauses are recognized by a speech pause recognizer and do not go into that Quality measure.
- the reference speech signal and is also filtered evaluating speech signal with a bandpass 300 ... 3400 Hz and a filtering on the Frequency response of a telephone handset.
- the integration of the spectral power density takes place in frequency groups, which are the basis for the calculation of specific loudness represent.
- the calculated loudness patterns are in addition to the general approach supplemented by an error evaluation function.
- the calculated quality value is over a Average of the correlation coefficients of the specific loudness for each considered short time segment over the number of evaluated language segments formed.
Description
Für die Berechnung der spektralen Kurzzeiteigenschaften kommen verschiedene Ansätze und Modelle zur Anwendung. In der Regel erfolgt die Berechnung der Signalintensität in Frequenzbändern, deren Breite mit zunehmender Mittenfrequenz größer wird. Beispiele für solche Frequenzbänder sind die bekannten Terzbänder oder Frequenzgruppen nach Zwicker (veröffentlicht in Zwicker, E.: "Psychoakustik", Berlin: Springer-Verlag, 1982).
Verschiebungen spektraler Kurzzeit-Maxima ("Formantverschiebungen") im zu testenden Signal gegenüber dem Referenzsprachsignal, z.B. verursacht durch Codiersysteme mit niedriger Bitrate, führen bei bekannten Verfahren zu großen Unterschieden in den spektralen Intensitätsabbildungen und gehen damit stark in den berechneten Qualitätswert ein. Untersuchungen haben ergeben, daß in einer auditiven Sprachqualitätsuntersuchung diese Verschiebungen spektraler Kurzzeit-Maxima jedoch nur begrenzten Einfluß auf das Qualitätsurteil haben.
Claims (6)
- Verfahren zur instrumentellen Sprachqualitätsbestimmung, bei dem durch Vergleich von spektralen Kurzzeiteigenschaften eines zu bewertenden Sprachsignals mit einem Referenzsprachsignal Kennwerte zur Bestimmung der Sprachqualität berechnet werden, dadurch gekennzeichnet, daß vor dem Vergleich der Eigenschaften der Sprachsignale, Unterschiede in mittleren spektralen Einhüllenden verringert werden, indem aus diesen zuerst eine spektrale Wichtungsfunktion berechnet wird, mit der die spektralen Kurzzeit-eigenschaften der Sprachsignale in allen betrachteten Zeitsegmenten gewichtet werden, so daß die Unterschiede in den mittleren spektralen Einhüllenden dadurch nur begrenzt in den zu berechnenden Qualitätskennwert einfließen, und
daß für die Berechnung der Signalintensität die Grenzen der benutzten Frequenzbänder variabel gestaltet werden, so daß für jeden betrachteten Signalabschnitt in jeweils allen ausgewerteten Frequenzbändern die berechneten Intensitäten von Referenzsprachsignal und zu bewertendem Signal zueinander möglichst geringe Unterschiede aufweisen. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zuerst die mittleren spektralen Einhüllenden von zu bewertenden Sprachsignal und Referenzsprachsignal in Form eines mittleren Leistungsdichtespektrums berechnet werden und aus dem Quotienten beider Spektren eine spektrale Wichtungsfunktion WT(f) berechnet wird, mit der die Kurzzeit-Leistungsdichtespektren des Referenzsprachsignals vor der Berechnung eines Qualitätskennwertes gewichtet werden.
- Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die zu berechnende Wichtungsfunktion WT(f) nur aus Teilbereichen der berechneten mittleren spektralen Einhüllenden von zu bewertenden Sprachsignal und Referenzsprachsignal berechnet wird und damit die Unterschiede in mittleren spektralen Einhüllenden zwischen beiden Signalen nur in spektralen Teilbereichen verringert werden.
- Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß vor Berechnung der Qualitätskennwerte eine Integration der Signalintensität für jeden ausgewerteten kurzen Zeitabschnitt in Frequenzgruppen erfolgt, wobei die Grenzen der Frequenzgruppen auf der Frequenzachse variabel sind, aber die Breite der Frequenzgruppen auf der Tonheitskala konstant bleibt, und daß aus den Signalintensitäten in den Frequenzgruppen eine Berechnung der spezifischen Lautheit erfolgt, wobei die Grenzen der Frequenzgruppen benutzt werden, bei denen die berechneten Unterschiede in der spezifischen Lautheit zwischen dem zu bewertenden Signal und dem Referenzsprachsignal im jeweils betrachteten Band und Zeitsegment den geringsten Unterschied aufweisen.
- Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß der Qualitäts-kennwert aus der Ähnlichkeit der spektralen Darstellungen in jedem betrachteten Zeitabschnitt berechnet wird, wobei die Ähnlichkeit einen über alle betrachteten Zeitabschnitte gemittelten Korrelationskoeffizienten zwischen der spektralen Darstellung des zu bewertenden Sprachsignals und der spektralen Darstellung des Referenzsprachsignals im jeweiligen Zeitsegment darstellt.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß der Korrelations-koeffizient zwischen der spektralen Darstellung des zu bewertenden Sprachsignals und der spektralen Darstellung des Referenzsprachsignals im jeweiligen Zeitsegment nur von einem Teilbereich der spektralen Darstellung berechnet wird, d.h. für die Berechnung des Qualitätskennwertes nicht alle berechneten Spektralwerte berücksichtigt werden.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19840548 | 1998-08-27 | ||
DE19840548A DE19840548C2 (de) | 1998-08-27 | 1998-08-27 | Verfahren zur instrumentellen Sprachqualitätsbestimmung |
PCT/EP1999/005972 WO2000013173A1 (de) | 1998-08-27 | 1999-08-14 | Verfahren zur instrumentellen sprachqualitätsbestimmung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1048025A1 EP1048025A1 (de) | 2000-11-02 |
EP1048025B1 true EP1048025B1 (de) | 2003-11-05 |
Family
ID=7879918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99942871A Expired - Lifetime EP1048025B1 (de) | 1998-08-27 | 1999-08-14 | Verfahren zur instrumentellen sprachqualitätsbestimmung |
Country Status (6)
Country | Link |
---|---|
US (1) | US7013266B1 (de) |
EP (1) | EP1048025B1 (de) |
AT (1) | ATE253765T1 (de) |
CA (1) | CA2305652A1 (de) |
DE (2) | DE19840548C2 (de) |
WO (1) | WO2000013173A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001065543A1 (en) * | 2000-02-29 | 2001-09-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Compensation for linear filtering using frequency weighting factors |
EP1241663A1 (de) * | 2001-03-13 | 2002-09-18 | Koninklijke KPN N.V. | Verfahren und Vorrichtung zur Sprachqualitätsbestimmung |
EP1292036B1 (de) * | 2001-08-23 | 2012-08-01 | Nippon Telegraph And Telephone Corporation | Verfahren und Vorrichtung zur Decodierung von digitalen Signalen |
DE10142846A1 (de) * | 2001-08-29 | 2003-03-20 | Deutsche Telekom Ag | Verfahren zur Korrektur von gemessenen Sprachqualitätswerten |
DE10150519B4 (de) | 2001-10-12 | 2014-01-09 | Hewlett-Packard Development Co., L.P. | Verfahren und Anordnung zur Sprachverarbeitung |
DE60305306T2 (de) * | 2003-06-25 | 2007-01-18 | Psytechnics Ltd. | Vorrichtung und Verfahren zur binauralen Qualitätsbeurteilung |
US7305341B2 (en) | 2003-06-25 | 2007-12-04 | Lucent Technologies Inc. | Method of reflecting time/language distortion in objective speech quality assessment |
ATE405922T1 (de) * | 2004-09-20 | 2008-09-15 | Tno | Frequenzkompensation für die wahrnehmungsbezogene sprachanalyse |
EP2249333B1 (de) * | 2009-05-06 | 2014-08-27 | Nuance Communications, Inc. | Verfahren und Vorrichtung zur Schätzung einer Grundfrequenz eines Sprachsignals |
EP2474975B1 (de) * | 2010-05-21 | 2013-05-01 | SwissQual License AG | Verfahren zur Schätzung der Sprachqualität |
US9373341B2 (en) * | 2012-03-23 | 2016-06-21 | Dolby Laboratories Licensing Corporation | Method and system for bias corrected speech level determination |
CN112233693B (zh) * | 2020-10-14 | 2023-12-01 | 腾讯音乐娱乐科技(深圳)有限公司 | 一种音质评估方法、装置和设备 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3708002A1 (de) * | 1987-03-12 | 1988-09-22 | Telefonbau & Normalzeit Gmbh | Messverfahren zum beurteilen der guete von sprachcodierern und/oder uebertragungsstrecken |
US4860360A (en) * | 1987-04-06 | 1989-08-22 | Gte Laboratories Incorporated | Method of evaluating speech |
GB9213459D0 (en) * | 1992-06-24 | 1992-08-05 | British Telecomm | Characterisation of communications systems using a speech-like test stimulus |
SE517836C2 (sv) * | 1995-02-14 | 2002-07-23 | Telia Ab | Metod och anordning för fastställande av talkvalitet |
NL9500512A (nl) * | 1995-03-15 | 1996-10-01 | Nederland Ptt | Inrichting voor het bepalen van de kwaliteit van een door een signaalbewerkingscircuit te genereren uitgangssignaal, alsmede werkwijze voor het bepalen van de kwaliteit van een door een signaalbewerkingscircuit te genereren uitgangssignaal. |
ES2161965T3 (es) * | 1996-05-21 | 2001-12-16 | Koninkl Kpn Nv | Dispositivo y procedimiento para la determinacion de la calidad de una señal de salida, para ser generada por un circuito de procesamiento de señal. |
-
1998
- 1998-08-27 DE DE19840548A patent/DE19840548C2/de not_active Expired - Fee Related
-
1999
- 1999-08-14 DE DE59907623T patent/DE59907623D1/de not_active Expired - Lifetime
- 1999-08-14 EP EP99942871A patent/EP1048025B1/de not_active Expired - Lifetime
- 1999-08-14 WO PCT/EP1999/005972 patent/WO2000013173A1/de active IP Right Grant
- 1999-08-14 CA CA002305652A patent/CA2305652A1/en not_active Abandoned
- 1999-08-14 US US09/530,389 patent/US7013266B1/en not_active Expired - Lifetime
- 1999-08-14 AT AT99942871T patent/ATE253765T1/de active
Also Published As
Publication number | Publication date |
---|---|
WO2000013173A1 (de) | 2000-03-09 |
DE19840548A1 (de) | 2000-03-02 |
DE59907623D1 (de) | 2003-12-11 |
US7013266B1 (en) | 2006-03-14 |
CA2305652A1 (en) | 2000-03-09 |
ATE253765T1 (de) | 2003-11-15 |
EP1048025A1 (de) | 2000-11-02 |
DE19840548C2 (de) | 2001-02-15 |
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