Residual excited predictive speech coding system
First Claim
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1. A speech communication circuit comprising:
- a speech analyzer including means for partitioning an input speech signal into time intervals;
means responsive to the speech signal of each interval for generating a set of first signals representative of the prediction parameters of said interval speech signal, a pitch representative signal and a voicing representative signal;
and means jointly responsive to said interval speech signal and said interval first signals for generating a signal corresponding to the prediction error of the interval;
and a speech synthesizer including an excitation generator responsive to said pitch and voicing representative signals for producing an excitation signal;
and means jointly responsive to said excitation signal and said first signals for constructing a replica of said input speech signal;
characterized in that said speech analyzer further includes means (124,
126) responsive to said prediction error signal for generating a set of second signals representative of the spectrum of the interval prediction error signal; and
said synthesizer excitation generator (220) is jointly responsive to said pitch representative, voicing representative and second signals to produce a prediction error compensating excitation signal.
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Abstract
In a speech processing arrangement for synthesizing more natural sounding speech, a speech signal is partitioned into intervals. For each interval, a set of coded prediction parameter signals, pitch period and voicing signals, and a set of signals corresponding to the spectrum of the prediction error signal are produced. A replica of the speech signal is generated responsive to the coded pitch period and voicing signals as modified by the coded prediction parameter signals. The pitch period and voicing signals are shaped responsive to the prediction error spectral signals to compensate for errors in the predictive parameter signals whereby the speech replica is natural sounding.
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Citations
10 Claims
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1. A speech communication circuit comprising:
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a speech analyzer including means for partitioning an input speech signal into time intervals; means responsive to the speech signal of each interval for generating a set of first signals representative of the prediction parameters of said interval speech signal, a pitch representative signal and a voicing representative signal; and means jointly responsive to said interval speech signal and said interval first signals for generating a signal corresponding to the prediction error of the interval; and a speech synthesizer including an excitation generator responsive to said pitch and voicing representative signals for producing an excitation signal; and means jointly responsive to said excitation signal and said first signals for constructing a replica of said input speech signal; characterized in that said speech analyzer further includes means (124,
126) responsive to said prediction error signal for generating a set of second signals representative of the spectrum of the interval prediction error signal; and
said synthesizer excitation generator (220) is jointly responsive to said pitch representative, voicing representative and second signals to produce a prediction error compensating excitation signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for processing a speech signal comprising the steps of:
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analyzing said speech signal including partitioning the speech signal into successive time intervals, generating a set of first signals representative of the prediction parameters of said interval speech signal, a pitch representative signal, and a voicing representative signal, responsive to the speech signal of each interval; and generating a signal corresponding to the prediction error of said speech interval jointly responsive to the interval speech signal and the first signals of the interval; and synthesizing a replica of said speech signal including producing an excitation signal responsive to said pitch and voicing representative signals and constructing a replica of said speech signal jointly responsive to said excitation signal and said first signals characterized in that said speech analyzing step further includes generating a set of second signals representative of the spectrum of the interval prediction error signal responsive to said prediction error signal; and
said excitation signal producing step includes forming a prediction error compensating excitation signal jointly responsive to said pitch representative signal, said voicing representative signal and said second signals. - View Dependent Claims (7, 8, 9, 10)
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Specification