Audio decoding with selective post-filter

Abstract

In one aspect, the invention provides an audio encoding method character-ized 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 (440, 540, 1040, 1140), 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 provided an audio decoding method with a de­coding step followed by a post-filtering step, including interharmonic noise attenu­ation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence inde­pendently of factors such as the current coding mode. Figure 10