Determining linear predictive coding filter parameters for encoding a voice signal
AssigneeInterDigital Technology Corporation
InventorsDaniel Lin, Brian M. McCarthy
Life of this patent
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Abstract
The present invention is a method for determining linear predictive coding filter parameters for encoding a voice signal. The method includes sampling a voice signal, grouping the samples into a plurality of frames, generating a plurality of reflection coefficients for each frame of samples, quantizing the reflection coefficients, generating spectral coefficients from the quantized reflection coefficients, selecting a quantized reflection coefficient having the smallest log-spectral distance between a quantized spectrum, and an unquantized spectrum and, converting the selected quantized reflection coefficient to linear predictive coding (LPC) filter coefficient.
Claims10
A method for determining linear predictive coding filter parameters for encoding a voice signal, the method comprising:
- sampling a voice signal;
- grouping the samples into a plurality of frames;
- generating a plurality of reflection coefficients for each frame of samples;
- generating spectral coefficients from said quantized reflection coefficients;
- selecting a quantized reflection coefficient having the smallest log-spectral distance between a quantized spectrum and an unquantized spectrum;
- and
- converting the selected quantized reflection coefficient to linear predictive coding (LPC) filter coefficients.
An apparatus for determining linear predictive coding filter parameters for encoding a voice signal, the apparatus comprising:
- a sampler for sampling a voice signal;
- an analyzer for generating a plurality of reflection coefficients for each frame of samples, each frame comprising a plurality of samples;
- a quantizer for quantizing the reflection coefficients and for generating spectral coefficients from the quantized reflection coefficients;
- a selection unit for selecting a quantized reflection coefficient having the smallest log-spectral distance between a quantized spectrum and an unquantized spectrum;
- and,
- a conversion unit for converting the selected quantized reflection coefficient to linear predictive coding (LPC) filter coefficients.
Dependencies are inferred from the claim text.