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Layered Code-Excited Linear Prediction Speech Encoder and Decoder in Which Closed-Loop Pitch Estimation is Performed with Linear Prediction Excitation Corresponding to Optimal Gains and Methods of Layered CELP Encoding and Decoding
Layered Code-Excited Linear Prediction Speech Encoder and Decoder in Which Closed-Loop Pitch Estimation is Performed with Linear Prediction Excitation Corresponding to Optimal Gains and Methods of Layered CELP Encoding and Decoding
A layered code-excited linear prediction (CELP) encoder, an Adaptive Multirate Wideband (AMR-WB) encoder and methods of CELP encoding and decoding. In one embodiment, the encoder includes: (1) a core layer subencoder and (2) at least one enhancement layer subencoder, at least one of the core layer subencoder and the enhancement layer subencoder having first and second adaptive codebooks and configured to retrieve a pitch lag estimate from the second adaptive codebook and perform a closed-loop search of the first adaptive codebook based on the pitch lag estimate.
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