REW parametric vector quantization and dual-predictive SEW vector quantization for waveform interpolative coding
First Claim
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1. A computerized system for coding a digital input signal representative of an audio waveform, comprising:
- a vector quantizer module comprising an input accepting a vector or rapidly evolving waveform spectra determined form the digital input signal;
a computer readable codebook comprising a plurality of arrays of quantized parametric vectors;
computer readable program instructions for searching said parameter codebook for one of said plurality of arrays of quantized parametric vectors which minimizes distortion; and
computer program instructions for outputting a computer readable indicator that points to the one of said plurality of arrays of quantized parameter vectors which minimizes distortion.
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Abstract
An enhanced analysis-by-synthesis waveform interpolative speech coder able to operate at 2.8 kbps. Novel features include dual-predictive analysis-by-synthesis quantization of the slowly-evolving waveform, efficient parametrization of the rapidly-evolving waveform magnitude, and analysis-by-synthesis vector quantization of the rapidly evolving waveform parameter. Subjective quality tests indicate that it exceeds G.723.1 at 5.3 kbps, and of G.723.1 at 6.3 kbps.
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18 Claims
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1. A computerized system for coding a digital input signal representative of an audio waveform, comprising:
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a vector quantizer module comprising an input accepting a vector or rapidly evolving waveform spectra determined form the digital input signal; a computer readable codebook comprising a plurality of arrays of quantized parametric vectors; computer readable program instructions for searching said parameter codebook for one of said plurality of arrays of quantized parametric vectors which minimizes distortion; and computer program instructions for outputting a computer readable indicator that points to the one of said plurality of arrays of quantized parameter vectors which minimizes distortion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer implemented method for coding a digital input signal representative of an audio waveform, comprising:
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determining a vector of rapidly evolving waveform spectra from the digital input signal; searching a computer readable codebook comprising a plurality of arrays of quantized parametric vector for one of said plurality of arrays of quantized parameter vectors which minimizes distortion; and outputting a computer readable indicator that points to the one of said plurality of arrays of quantized parameter vectors which minimizes said distortion. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification