US4776015A
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Speech analysis-synthesis apparatus and method
Assignee: Hitachi Ltd
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Filing: 1985-12-05
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Granted: 1988-10-04
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Expires: 2005-12-05
Abstract
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.
Inventors
- 👤 Shoichi Takeda
- 👤 Akira Ichikawa
- 👤 Yoshiaki Asakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:04
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/08; G10L19/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
118 words
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.
Claim 2
Dependent Claim
118 words
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.
Claim 3
Dependent Claim
23 words
A speech analysis apparatus according to claim 1, wherein said sound source information generating means determines amplitude and location of sound source pulses.
Claim 4
Dependent Claim
53 words
A speech analysis apparatus according to claim 2, further including means for synthesizing speech corresponding to said input speech, and wherein said amplitude and location of said sound source pulses are determined so that the error between the input speech and said synthesized speech generated by said means for synthesizing may be minimized.
Claim 5
Dependent Claim
63 words
A speech analysis apparatus according to claim 1, wherein said factor of said factor determining means is selected to have a value γ satisfying the following conditions: 0≦γ≦1; γ≦-0.77M/N+1.05; and γ≦-0.95M/N+0.75; wherein M is an integer corresponding to the number of said sound source pulses and N is an integer corresponding to the maximum number of said sound source pulses within one frame.
Claim 6
Dependent Claim
20 words
A speech analysis apparatus according to claim 1, wherein said sound source pulses generated are used as a sound source.
Claim 7
Dependent Claim
21 words
A speech apparatus according to claim 1, wherein said source pulses generated are used as a sound source in speech synthesizing.
Claim 8
Dependent Claim
142 words
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: 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.
Claim 9
Dependent Claim
142 words
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: 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.
Claim 10
Dependent Claim
125 words
A speech analysis apparatus for generating a sound source to be used in speech synthesizing, comprising: 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.
Claim 11
Dependent Claim
125 words
A speech analysis apparatus for generating a sound source to be used in speech synthesizing, comprising: 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.
Claim 12
Dependent Claim
27 words
A speech analysis apparatus used in speech synthesizing according to claim 8, wherein said sound source information generating means determines amplitude and location of sound source pulses.
Claim 13
Dependent Claim
57 words
A speech analysis apparatus used in speech synthesizing according to claim 9, further including means for synthesizing speech corresponding to said inputted speech, and wherein said amplitude and location of said sound source pulses are determined so that the error between the inputted speech and said synthesized speech generated by said means for synthesizing may be minimized.
Claim 14
Dependent Claim
62 words
A speech analysis apparatus according to claim 8, wherein said factor of said determining means is selected to have a value γ satisfying the following conditions: 0≦γ≦1; γ≦-0.77M/N+1.5; and γ≦-0.95M/N+0.75; wherein M is an integer corresponding to the number of said sound source pulses and N is an integer corresponding to the maximum number of said sound source pulses within one frame.
Claim 15
Dependent Claim
114 words
A speech analysis apparatus comprising: 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.
Claim 16
Dependent Claim
114 words
A speech analysis apparatus comprising: 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.
Claim 17
Dependent Claim
22 words
A speech analysis apparatus according to claim 12, wherein said sound source information generating means determines amplitude and location of sound source.
Claim 18
Dependent Claim
53 words
A speech analysis apparatus according to claim 13, further including means for synthesizing speech corresponding to said inputted speech, and wherein said amplitude and location of said sound source pulses are determined so that the error between the inputted speech and said synthesized speech generated by said means for synthesizing may be minimized.
Claim 19
Dependent Claim
63 words
A speech analysis apparatus according to claim 12, wherein said factor of said factor determining means is selected to have a value γ satisfying the following conditions: 0≦γ≦1; γ≦-0.77M/N+1.05; and γ≦-0.95M/N+0.75; wherein M is an integer corresponding to the number of said sound source pulses and N is an integer corresponding to the maximum number of said sound source pulse within one frame.
Claim 20
Dependent Claim
20 words
A speech analysis apparatus according to claim 12, wherein said sound source pulses generated are used as a sound source.
Claim 21
Dependent Claim
21 words
A speech apparatus according to claim 12, wherein said source pulses generated are used as a sound source in speech synthesizing.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |