Patent
Method and apparatus for coding an informational signal
TLDR
In this paper, a CELP encoder is provided that optimizes excitation vector-related parameters in a more efficient manner than the encoders of the prior art.Abstract:
A CELP encoder is provided that optimizes excitation vector-related parameters in a more efficient manner than the encoders of the prior art. In one embodiment, a CELP encoder (400) optimizes excitation vector-related parameters (τ, β, λ, and η) based on a computed correlation matrix (Ζ'), which matrix is in turn based on a filtered first excitation vector (yτ(n)). The encoder then evaluates error minimization criteria based on at least in part on a target signal (xw(n)), which target signal is based on an input signal (s(n)), and the correlation matrix and generates a excitation vector-related index in response to the error minimization criteria. In another embodiment, a CELP encoder (600) is provided that is capable of jointly optimizing and/or sequentially optimizing multiple excitation vector-related parameters by reference to a joint search weighting factor (μ), thereby invoking an optimal error minimization process.read more
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References
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PatentDOI
Method and apparatus for low-delay celp speech coding and decoding
TL;DR: In this paper, a low-bitrate (typically 8 kbit/s or less), low-delay digital coder and decoder based on Code Excited Linear Prediction for speech and similar signals features backward adaptive adjustment for codebook gain and short-term synthesis filter parameters and forward adaptive adjustment of long-term (pitch) synthesis filter parameter.
PatentDOI
Digital speech coder having improved vector excitation source
TL;DR: In this article, an improved vector generation and search technique was described for a code-excited linear prediction (CELP) speech coder using a codebook of excitation code vectors.
Patent
High quality low bit rate celp-based speech codec
TL;DR: In this article, a low-bit-rate speech decoder is proposed, which operates in two modes depending on the received mode bit, pitch prefiltering and global post-filtering are employed for enhancement of the synthesized speech.
Patent
Speech codec employing speech classification for noise compensation
TL;DR: In this paper, a method of encoding an input speech signal using a multi-rate encoder having a plurality of encoding rates is disclosed, where a high-pass filter and then a perceptual weighting filter are applied to such signal to generate a first target signal.