Global Patent Index - EP 2388779 A1

EP 2388779 A1 20111123 - Method for estimating speech quality

Title (en)

Method for estimating speech quality

Title (de)

Verfahren zur Schätzung der Sprachqualität

Title (fr)

Procédé d'évaluation de la qualité vocale

Publication

EP 2388779 A1 20111123 (EN)

Application

EP 10005327 A 20100521

Priority

EP 10005327 A 20100521

Abstract (en)

The invention relates to a method for estimating speech quality, wherein a reference speech signal (101) with a reference speech spectrum (X) enters a telecommunication network resulting in a test speech signal (102) with a test speech spectrum (Y), the method comprising the steps of identifying a number of perceptually dominant frequency sub-bands (bi) in one of the reference speech spectrum (X) and the test speech spectrum (Y), computing an intensity scaling factor (c i ) for each identified sub-band (bi) by minimizing a measure of the intensity difference between those parts of the reference speech spectrum (X) and of the test speech spectrum (Y) that correspond to the respective sub-band (b i ), multiplying the test speech spectrum (Y) with each intensity scaling factor (c i ) thereby generating a number of scaled test speech spectra (Y i ), selecting one scaled test speech spectrum, and computing the difference between the selected scaled test speech spectrum (Y sel ) and the reference speech spectrum (X), the difference being indicative of the speech quality of the test speech signal (102). The invention furthermore relates to a method for estimating speech quality in which the reference and the test speech signal are aligned and to a method for estimating speech quality that deals with interruptions and speech loss.

IPC 8 full level

G10L 19/00 (2006.01); G10L 25/69 (2013.01)

CPC (source: EP)

G10L 25/69 (2013.01)

Citation (applicant)

  • PAULUS, E.; ZWICKER, E.: "Programme zur automatischen Bestimmung der Lautheit aus Terzpegeln oder Frequenzgruppenpegeln", ACUSTICA, vol. 27, no. 5, 1972
  • BEERENDS, J.G.; HEKSTRA, A.P.; RIX, A.W.; HOLLIER, M.P.: "Perceptual Evaluation of Speech Quality (PESQ), the new ITU standard for end-to-end speech quality assessment. Part I - Time alignment", J. AUDIO. ENG. SOC., vol. 50, no. 10, October 2002 (2002-10-01)
  • BEERENDS, J.G.; HEKSTRA, A.P.; RIX, A.W.; HOLLIER, M.P.: "Peceptial Evaluation of Speech Quality (PESQ), the new ITU standard for end-to-end speech quality assessment. Part II - Psychoacoustic model", J. AUDIO ENG. SOC., vol. 50, no. 10, October 2002 (2002-10-01)
  • BEERENDS, J.G.; STEMERDINK, J.A.: "A perceptual speech quality measure based on a psychoacoustic sound representation", J. AUDIO ENG. SOC., vol. 42, no. 3, December 1994 (1994-12-01)
  • "TOSQA - Telecommunication objective speech quality assessment", ITU-T, STUDY GROUP 12, December 1997 (1997-12-01)
  • "Methods for subjective determination of transmission quality", ITU-T RECOMMENDATION P.800, 1996

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

Designated extension state (EPC)

BA ME RS

DOCDB simple family (publication)

EP 2388779 A1 20111123; EP 2388779 B1 20130220; EP 2474975 A1 20120711; EP 2474975 B1 20130501

DOCDB simple family (application)

EP 10005327 A 20100521; EP 12000483 A 20100521