Patent
Method and apparatus for fast celp parameter mapping
TLDR
In this paper, an apparatus and method for mapping CELP parameters between a source codec and a destination codec is presented, which consists of an LSP mapping module, an adaptive codebook mapping module coupled to the LSP, and a fixed codebook map module coupled with the LP overflow module.Abstract:
An apparatus and method for mapping CELP parameters between a source codec and a destination codec. The apparatus includes an LSP mapping module, an adaptive codebook mapping module coupled to the LSP mapping module, and a fixed codebook mapping module coupled to the LSP mapping module and the adaptive codebook mapping module. The LSP mapping module includes an LP overflow module and an LSP parameter modification module. The adaptive codebook mapping module includes a first pitch gain codebook. The fixed codebook mapping module includes a first target processing module, a pulse search module, a fixed codebook gain estimation module, a pulse position searching module.read more
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References
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PatentDOI
Low rate multi-mode CELP codec that encodes line SPECTRAL frequencies utilizing an offset
TL;DR: A multi-mode CELP encoding and decoding method and device for digitized speech signals providing improvements over prior art codecs and coding methods by selectively utilizes backward prediction for the short-term predictor parameters and fixed codebook gain of a speech signal.
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Method and apparatus for improving the voice quality of tandemed vocoders
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Speech transcoding method and apparatus
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