Wideband speech coding system and method
First Claim
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1. A method of wideband speech decoding, comprising:
- (a) decoding a first portion of an input signal as a lowband speech signal;
(b) decoding a second portion of an input signal as a noise-modulated excitation of a linear prediction encoding wherein said noise modulated excitation is noise modulated by a portion of the results of said decoding as a lowband speech signal of preceding step (a) and adaptively smoothed; and
(c) combining the results of foregoing steps (a) and (b) to form a decoded wideband speech signal.
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Abstract
A speech encoder/decoder for wideband speech with a partitioning of wideband into lowband and highband, convenient coding of the lowband, and LP excited by noise plus some periodicity for the highband. The embedded lowband may be extracted for a lower bit rate decoder.
53 Citations
6 Claims
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1. A method of wideband speech decoding, comprising:
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(a) decoding a first portion of an input signal as a lowband speech signal; (b) decoding a second portion of an input signal as a noise-modulated excitation of a linear prediction encoding wherein said noise modulated excitation is noise modulated by a portion of the results of said decoding as a lowband speech signal of preceding step (a) and adaptively smoothed; and (c) combining the results of foregoing steps (a) and (b) to form a decoded wideband speech signal. - View Dependent Claims (2, 3, 5, 6)
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4. A wideband speech decoder, comprising:
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(a) a first speech decoder with an input for encoded narrowband speech; (b) a second speech decoder with an input for encoded highband speech and an input for the output of said first speech decoder, said second speech decoder using excitation of noise modulated by a portion of the output of said first speech decoder and adaptively smoothed; and (c) a combiner for the outputs of said first and second speech decoders to output decoded wideband speech.
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Specification