Nova Patents
EP1364501A4

Method and system for evaluating the quality of packet-switched voice signals

Abstract

A method and apparatus for determining what level of performance must be maintained by a second communication service so as to be perceived as being of equal quality to a first communication service, especially where the second communication service is subject to additional impairments not experienced by the first communication service. In one example embodiment, the present invention is applied to determining what combinations of packet loss rate and packet delay are tolerable where a packet switched telephony service is desired to be perceived to be substantially equivalent to a traditional toll-quality non-packet-switched telephone service. Empirically derived models are used to relate user perception to objectively measurable characteristics, such as packet loss rate.

Term

Term ended

Projected expiry passed 7 February 2022, 4.6 years ago.

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Every citation, both waysCites: the store holds 6 of 7

Citations
DocumentRelationOfficeCategoryCited duringRelevant claims
WO0033511A1CitesWorld Intellectual Property Organization (WIPO)XSearch report1-18,22-31
US5940471ACitesUnited States of AmericaXSearch report1-3
US6041294ACitesUnited States of AmericaASearch report1-21,32
WO9859509A1CitesWorld Intellectual Property Organization (WIPO)XSearch report1-18,22-31
WO0033511ACitesWorld Intellectual Property Organization (WIPO)–––
WO9859509ACitesWorld Intellectual Property Organization (WIPO)–––
ITU-T STUDY GROUP 12: "Objective quality measurement of telephone-band (300-3400Hz) speech codecs", ITU-T RECOMMENDATION P.861, 27 February 1998 (1998-02-27), pages 1 - 33, XP002327960Non-patent––Search report–
ANONYMOUS: "Real=time quality measurement for telecommunication calls - by alerting subscriber of call selected to be in sample before going to operator", WPI WORLD PATENT INFORMATION DERWENT, DERWENT, GB, vol. 46, no. 92, 25 October 1992 (1992-10-25), XP002064923Non-patent––Search report–
ITU-T RECOMMENDATION P.862: "Perceptual evaluation of speech quality (PESQ): An objective assessment of narrow-band telephone networks and speech codecs", ITU-T STUDY GROUP 12, 23 February 2001 (2001-02-23), pages 1 - 21, XP002327961Non-patent––Search report–
RIX A W ET AL: "PESQ - the new ITU standard for end-to-end speech quality assessment", AUDIO ENGINEERING SOCIETY CONVENTION PAPER, NEW YORK, NY, US, 22 September 2000 (2000-09-22), pages 1 - 18, XP002262437Non-patent––Search report–