AN INTERHARMONIC NOISE ATTENUATION POST FILTER, A DECODER SYSTEM AND A METHOD OF DECODING, AN ENCODER SYSTEM AND A METHOD OF ENCODING

摘要

Ia one aspect, the invention provides an audio en-coding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is pro�vided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenua�tion, and being characterized in a step of disabling the post filter in accordance with post filtering information encodedin the bit stream signal. Such a method is well suited for mixed-origin au�dio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence inde�pendently of factors such as the current coding mode.