Voice encoder and voice encoding method
First Claim
1. A speech encoder comprising a dispersed-pulse codebook that generates a vector by convoluting a vector containing one or more one non-zero elements, elements other than non-zero elements have values of zero, and a fixed waveform comprising a dispersion pattern, wherein said dispersed-pulse codebook has a configuration different from a configuration of the dispersed-pulse codebook on the speech decoder side.
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Accused Products
Abstract
A vector code book (1094) where representative samples of vectors to be quantized are stored is created. Each vector is made up of three elements: an AC gain, a value corresponding the logarithm of an SC gain, and an adjustment coefficient of the prediction coefficient of SC. Coefficients for predictive coding are stored in a prediction coefficient storage section (1095). The coefficients are the prediction coefficients of MA, and two kinds of coefficients, AC and SC for the order of prediction are stored. A parameter calculating section (1091) calculates a parameter necessary for distance calculation from an auditory sensation weighting input voice, an adaptive sound source subjected to auditory weighting LPC synthesis, a probabilistic sound source subjected to auditory sensation weighting LPC synthesis, a decoded vector (AC, SC, adjustment coefficient) stored in a decoded vector storage section (1096), and the prediction coefficients (AC, SC) stored in the prediction coefficient storage section (1095).
24 Citations
24 Claims
- 1. A speech encoder comprising a dispersed-pulse codebook that generates a vector by convoluting a vector containing one or more one non-zero elements, elements other than non-zero elements have values of zero, and a fixed waveform comprising a dispersion pattern, wherein said dispersed-pulse codebook has a configuration different from a configuration of the dispersed-pulse codebook on the speech decoder side.
- 16. A speech encoding/decoding system comprising a speech encoder and a speech decoder each having a dispersed-pulse codebook in a configuration different from each other.
Specification