Patent Document ID: 20020026309
Application ID: 09866854
Patent Flag: 0

Claim One:
1. An apparatus for determining a quality measure indicative of the quality of an audio signal, the apparatus comprising: a memory for storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined audio model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined audio model has those parameter values, given that the model is assumed to have generated the set of audio signal values; means for receiving a set of audio signal values representative of an input audio signal; means for applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values; means for processing said function with said set of received audio signal values applied, to derive samples of parameter values from said probability density; means for analysing at least some of said derived samples of parameter values to determine a quality measure indicative of the quality of the received audio signal values.