Method of analyzing input speech and speech analysis apparatus therefor
First Claim
1. A speech analysis apparatus capable of obtaining an analysis result inherent to a phoneme, regardless of vocal tract lengths, comprising:
- transforming means for receiving a spectrum envelope representing intensity data of a spectrum corresponding to a speech signal, and for proportionally transforming the received spectrum envelope such that maximum intensity data of the spectrum envelope is substantially equal to a predetermined intensity data;
integrating means for integrating the transformed spectrum envelope from said transforming means with respect to a predetermined variable from a first value of the variable to a second value of the variable obtain integral data at the second value; and
projecting means for projecting the transformed spectrum envelope with respect to the integrated data by varying the second value from the first value to a third value of the variable, and for obtaining a relationship between intensity data of the transformed spectrum envelope at the second value and the integral data at the second value.
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Abstract
A speech analysis apparatus according to the invention, comprising a transforming section for receiving a spectrum envelope, for transforming the spectrum envelope such magnitude data thereof becomes suitable, and for generating a transformed spectrum envelope, an integrator for receiving the transformed spectrum envelope output from the transforming section, for integrating the input spectrum envelope with respect to a predetermined variable, and for outputting an integrated spectrum envelope, and a projection circuit for receiving the transformed spectrum envelope from the transform circuit and the integrated spectrum envelope from the integrator, and for projecting the spectrum envelope with respect to the integrated data. Therefore, the analysis result inherent to the phoneme can be obtained regardless of vocal tract lengths. The spectrum envelope to be projected can be integrated by the integrator, along the frequency axis or the mel axis. The analysis apparatus further includes a spectrum envelope-extractor for obtaining the spectrum envelope, by using cepstrum analysis and smoothing the resultant spectrum envelope. A spectrum envelope in the transition from a consonant to a vowel can be obtained.
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Citations
30 Claims
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1. A speech analysis apparatus capable of obtaining an analysis result inherent to a phoneme, regardless of vocal tract lengths, comprising:
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transforming means for receiving a spectrum envelope representing intensity data of a spectrum corresponding to a speech signal, and for proportionally transforming the received spectrum envelope such that maximum intensity data of the spectrum envelope is substantially equal to a predetermined intensity data; integrating means for integrating the transformed spectrum envelope from said transforming means with respect to a predetermined variable from a first value of the variable to a second value of the variable obtain integral data at the second value; and projecting means for projecting the transformed spectrum envelope with respect to the integrated data by varying the second value from the first value to a third value of the variable, and for obtaining a relationship between intensity data of the transformed spectrum envelope at the second value and the integral data at the second value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of obtaining an analysis result inherent to a phoneme, regardless of vocal tract lengths comprising:
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receiving a spectrum envelope to proportionally transform the spectrum envelope such that maximum intensity data of the received spectrum envelope is substantially equal to predetermined intensity data; integrating the transformed spectrum envelope with respect to a predetermined variable from a first value of the variable to a second value of the variable to obtain data at the second value; varying the second value from the first value to a third value of the variable to obtain a relationship between intensity data of the transformed spectrum envelope at the second value and the integral data at the second value. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. An apparatus capable of extracting a spectrum envelope from an input speech signal, comprising:
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Fourier transforming means for Fourier transforming the speech signal to obtain a power spectra; pitch frequency detecting means for detecting a pitch frequency of the speech signal from the obtained power spectra; spectrum extracting means for extracting from the obtained power spectra each partial power spectrum within a frequency range defined as;
space="preserve" listing-type="equation">fP×
n-fP/2<
fA<
fP×
n+fP/2where fP is the detected pitch frequency and n is 0 or a positive integer; and inverse Fourier transforming means for performing inverse Fourier transformation of each partial power spectrum to obtain the spectrum envelope. - View Dependent Claims (29, 30)
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Specification