Speech analysis-synthesis apparatus and method
First Claim
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1. A speech analysis apparatus comprising:
- means to input speech;
analyzing means for analyzing the speech input to obtain spectral envelope information;
means for determining an impulse response from said spectral envelope information;
means for determining a factor for effecting perceptual weighting in a manner to correspond to a sound source pulse number;
means for determining a cross-correlation between the input speech and said impulse response, wherein both are perceptually weighted on the basis of said factor;
means for determining an auto-correlation from the impulse response which is perceptually weighted on the basis of said factor; and
means for generating sound source information necessary for the speech analysis from said cross-correlation, said auto-correlation and said sound source pulse number.
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Abstract
Herein disclosed is a speech analysis-synthesis apparatus which resorts to a multi-pulse exciting method using a plurality of modeled pulses as a synthetic sound source if input speech is analyzed so that speech may be synthesized on the basis of the analyzed result. A factor for effecting perpetual weighting in a manner to correspond to the sound source pulse number is made variable, and the error between the input speech and the synthesized speech is perceptually weighted so that the amplitude and location of the train of the sound source pulses are so determined as to minimize said error.
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Citations
17 Claims
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1. A speech analysis apparatus comprising:
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means to input speech; analyzing means for analyzing the speech input to obtain spectral envelope information; means for determining an impulse response from said spectral envelope information; means for determining a factor for effecting perceptual weighting in a manner to correspond to a sound source pulse number; means for determining a cross-correlation between the input speech and said impulse response, wherein both are perceptually weighted on the basis of said factor; means for determining an auto-correlation from the impulse response which is perceptually weighted on the basis of said factor; and means for generating sound source information necessary for the speech analysis from said cross-correlation, said auto-correlation and said sound source pulse number. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A speech analysis-synthesis method by a multipulse excitation using a plurality of pulses generated in a modelled manner as a synthetic sound source if an input is to be analyzed so that speech may be synthesized on the basis of the analyzed result, comprising the steps of:
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providing a variable factor for effecting in a perceptually weighting factor in a manner to correspond to a sound source pulse number; perceptually weighting said input speech and an impulse response which is determined from spectral envelope information obtained as a result of the analysis of said input speech; determining a cross-correlation between said input speech and said impulse response, wherein both of which are perceptually weighted; determining an auto-correlation from said impulse response which is perceptually weighted; and generating an amplitude and location of said sound source pulses from said cross-correlation and said auto-correlation.
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8. A speech analysis apparatus for generating a sound source to be used in speech synthesizing, comprising:
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means to input speech; analyzing means for analyzing inputted speech to obtain spectral envelope information; means for determining an impulse response from said spectral envelope information; means for determining a factor for effecting perceptual weighting in a manner to correspond to a sound source pulse number; means for determining a cross-correlation between the input speech and said impulse response, wherein both are perceptually weighted on the basis of said factor; means for determining an auto-correlation from the impulse response which is perceptually weighted on the basis of said factor; and means for generating sound source information necessary for the speech analysis in response to said cross-correlation and said auto-correlation. - View Dependent Claims (9, 10, 11)
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12. A speech analysis apparatus comprising:
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means to input speech; analyzing means for analyzing inputted speech to obtain spectral envelope information; means for determining an impulse response from said spectral envelope information; means for determining a factor for effecting perceptual weighting in a manner to correspond to a sound source pulse number; means for determining a cross-correlation between the input speech and said impulse response, wherein both are perceptually weighted on the basis of said factor; means for determining an auto-correlation from the impulse response which is perceptually weighted on the basis of said factor; and means for generating sound source information necessary for the speech analysis in response to said cross-correlation and said auto-correlation. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification
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Current AssigneeHitachi, Ltd.
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Original AssigneeHitachi, Ltd.
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InventorsTakeda, Shoichi, Ichikawa, Akira, Asakawa, Yoshiaki
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Primary Examiner(s)Wong, Peter S.
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Application NumberUS06/804,938Time in Patent Office1,034 DaysField of Search381/36, 381/37, 381/38, 381/39, 381/41, 381/46, 381/47, 381/49, 381/50, 381/51, 364/513.5US Class Current704/220CPC Class CodesG10L 19/10 the excitation function bei...
