Patent ID: 8738385
Filing Date: 2014-05-27
Classification: G10L

Abstract:
1. A system for enhancing the quality of an audio signal produced by an audio codec, comprising: a pitch-based pre-filter that adaptively filters an input audio signal to produce a filtered audio signal, wherein adaptively filtering the input audio signal comprises filtering each of a plurality of segments of the input audio signal in a manner that is dependent upon an estimated pitch period associated therewith; an audio encoder that encodes the filtered audio signal to generate a compressed audio bit stream; an audio decoder that decodes the compressed audio bit stream to generate a decoded audio signal; and a pitch-based post-filter that adaptively filters the decoded audio signal to produce an output audio signal, wherein adaptively filtering the decoded audio signal comprises filtering each of a plurality of segments of the decoded audio signal in a manner that is dependent upon an estimated pitch period associated therewith, and wherein the pitch-based post-filter operates to undo at least part of a signal-shaping effect of the pitch-based pre-filter.