Patent ID: 9558754
Date: 2017-01-31
CPC Classifications: G10L

Claim:
1. An audio decoding processor for decoding an encoded audio bitstream, the audio decoding processor capable of being operated in one of at least two different decoding modes and comprising: a demultiplexer for obtaining audio data and control information from the encoded audio bitstream; a first audio decoder configured to operate in a first decoding mode using a first decoding technique; a second audio decoder configured operate in a second decoding mode using a second decoding technique, the second decoding technique being different from the first decoding technique; a pitch predictor integrated into the second audio decoder, the pitch predictor including a long-term prediction filter and a short-term prediction filter; a selector for selecting one of the at least two different decoding modes based on first control information obtained from the encoded audio bitstream; a pitch enhancement filter that is selectively operated in either an active mode or an inactive mode based on second control information obtained from the encoded audio bitstream that is independent of the first control information for selecting the decoding mode, wherein the active mode causes the pitch enhancement filter to filter a preliminary audio signal generated by the first audio decoder or the second audio decoder and the inactive mode causes the pitch enhancement filter to not filter the preliminary audio signal; and an output interface for outputting a decoded audio signal, the decoded audio signal being processed at least in part by the first audio decoder or the second audio decoder.