Patent ID: 7657388
Filing Date: 2010-02-02
Classification: G10L

Abstract:
1. A method of assessing speech quality transmitted via a packet based telecommunications network comprising the steps of: storing a sequence of intercepted packets associated with a call, each packet containing storing with each intercepted packet an indication of an intercept time of said packet; extracting a set of parameters from said sequence of intercepted packets; generating an estimated mean opinion score in dependence upon said set of parameters; and storing said estimated mean opinion score on a computer-readable medium accessible by a user for visualization and analysis, wherein the extracting step comprises the sub steps of: generating a jitter parameter for each packet of said sequence of stored packets in dependence upon generating a long term average jitter parameter (lt_jitter) for said stored packet in dependence upon the value of said jitter parameter (jitter) for said stored packet, the value of said jitter parameter for any preceding stored packets, and a predetermined adaptation rate (P) according to the equation: generating a differential jitter parameter in dependence upon the jitter parameter for said stored packet and the long term average jitter parameter; and in which said set of parameters includes said differential jitter parameter.