Patent ID: 8630864
Filing Date: 2014-01-14
Classification: G10L

Abstract:
1. A method of bitrate switching when decoding an audio signal coded by a multirate audio coding system, said method comprising: supplying a first signal and a second signal from a decoded signal to an input of a cross-fading module, at least one of the first and second signals being post-processed in a post-processing step, the post-processing forming part of a set of post-processing operations suited to different sets of rates; upon detection of a rate switch between a current frame at a rate lying within a first set of rates and a preceding frame at a rate lying within a second set of rates, performing crossfading by weighting to reduce a weight of the second signal, whether post-processed or unpost-processed, according to the post-processing suited to the second set of rates and to increase a weight of the first signal, whether post-processed or unpost-processed, according to the post-processing suited to the first set of rates to obtain an output signal; and upon detection of a rate switch between a current frame at a rate lying within a second set of rates and a preceding frame at a rate lying within a first set of rates, performing a cross-fading by weighting to reduce the weight of the first signal, whether post-processed or unpost-processed, according to the post-processing suited to the first set of rates and to increase the weight of the second signal, whether post-processed or unpost-processed, according to the post-processing suited to the second set of rates to obtain an output signal.