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US 5,204,906 AGranted
Voice signal processing device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkira Nohara, Joji Kane
Life of this patent
Estimating the term…
Abstract
A noise-contained voice signal is cepstrum-analyzed to determine a peak and a mean-value thereof. When a peak is present, the signal is determined to be a vowel portion, and when a mean-value is large, the signal is determined to be a consonant portion, thereby allowing a voice portion to be accurately determined. Further, utilizing the detected result, noise is accurately canceled.
Claims6
A voice signal processing device comprising:
- frequency analysis means for frequency analyzing a voice input signal to provide an output;
- pitch extraction-analysis means for pitch extracting and analyzing the output from said frequency analysis means to provide a pitch-extracted and analyzed output;
- pitch detection means for detecting a pitch of the pitch-extracted and analyzed output to provide pitch-detected information;
- mean-value calculation means for calculating a mean-value level of the analyzed output from said pitch extraction-analysis means to provide mean-value level information;
- and
- vowel/consonant detection means for detecting a vowel on the basis of the pitch-detected information from said pitch detection means, and a consonant on the basis of the mean-value level information from said mean-value calculation means.
3 more elements
A voice signal processing device comprising:
- band division means for band dividing a voice input signal to provide a band-divided output;
- cepstrum analysis means for cepstrum analyzing the band-divided output to provide a cepstrum-analyzed output;
- peak detection means for detecting a cepstrum peak in the cepstrum-analyzed output from said cepstrum analysis means to provide peak-detected information;
- mean-value calculation means for calculating a mean-value level of the cepstrum-analyzed output from said cepstrum analysis means to provide mean-value level information;
- and
- vowel/consonant detection means for detecting a vowel on the basis of the peak-detected information from said peak detection means, and a consonant on the basis of the mean-value level information from said mean-value calculation means.
3 more elements
A voice signal processing device comprising:
- frequency analysis means for frequency analyzing a voice input signal to provide a frequency-analyzed output, the frequency-analyzed output comprising a Fourier transformed voice signal;
- cepstrum analysis means for cepstrum analyzing the frequency-analyzed output from said frequency analysis means to provide a cepstrum-analyzed output;
- peak detection means for detecting a cepstrum peak in the cepstrum-analyzed output from said cepstrum analysis means to provide peak-detected information;
- mean-value calculation means for calculating a mean-value level of the cepstrum-analyzed output from said cepstrum analysis means to provide mean-value level information;
- vowel/consonant detection means for detecting a vowel on the basis of the peak-detected information from said peak detection means, and a consonant on the basis of the mean-value level information from said mean-value calculation means;
- cancel coefficient setting means for setting a cancel coefficient utilizing detection results from the vowel/consonant detection means;
- noise prediction means to which the Fourier-transformed voice signal from said frequency analysis means is applied, said noise prediction means predicting a noise component in the transformed voice signal to provide a noise-predicted output;
- cancel means to which the noise-predicted output from said noise prediction means, the voice signal, and the cancel coefficient signal set by said cancel coefficient setting means are applied, said cancel means cancelling a noise component, based upon a cancel ratio, from the voice signal to provide a noise-canceled output signal;
- and
- signal composition means for composing a composed signal based upon the noise-canceled output signal from said cancel means.
7 more elements
A voice signal processing device comprising:
- band division means for band dividing a voice input signal to provide a band-divided output, the band-divided output comprising a Fourier transformed voice signal;
- cepstrum analysis means for cepstrum analyzing the band-divided output from said band division means to provide a cepstrum-analyzed output;
- peak detection means for detecting a cepstrum peak in the cepstrum-analyzed output from said cepstrum analysis means to provide peak-detected information;
- means-value calculation means for calculating a mean-value level of the cepstrum-analyzed output from said cepstrum analysis means to provide mean-value level information;
- vowel/consonant detection means for detecting a vowel on the basis of the peak-detected information from said peak detection means, and a consonant on the basis of the mean-value level information from said mean-value calculation means;
- cancel coefficient setting means for setting a cancel coefficient utilizing detection results from the vowel/consonant detection means;
- noise prediction means to which the Fourier-transformed voice signal from said frequency analysis means is applied, said noise prediction means predicting a noise component in the transformed voice signal to provide a noise-predicted output;
- cancel means to which the noise-predicted output from said noise prediction means, the voice signal, and the cancel coefficient signal set by said cancel coefficient setting means are applied, said cancel means cancelling a noise component, based upon a cancel ratio, from the voice signal to provide a noise-cancelled output signal;
- and
- band composition means for band composing a composed signal based upon the noise-cancelled output signal from said cancel means.
7 more elements
Dependencies are inferred from the claim text.