Patent ID: 9343077
Filing Date: 2016-05-17
CPC Classification: G10L

Claim Text:
1. A pitch filter for filtering a preliminary audio signal generated from an audio bitstream, the pitch filter having an operating mode selected from one of either: (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and (ii) an inactive mode where the pitch filter is disabled; wherein the preliminary audio signal is generated in an audio decoder operating in a coding mode selected from at least two distinct coding modes, and the pitch filter is capable of being selectively operated in either the active mode or the inactive mode based on control information while the audio decoder is operating in the coding mode, wherein the audio bitstream is segmented into frames of audio content and the control information includes a frame type parameter with one or more first values of the frame type parameter indicating that the pitch filter should be operated in the active mode and a second value of the parameter indicating that the pitch filter should be operated in the inactive mode.