Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1996-09-04
1998-12-01
Dorvil, Richemond
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704205, 704251, G10L 302
Patent
active
058452419
ABSTRACT:
A speech processing and analysis apparatus and method for generating a time-frequency distribution of a speech signal combines a set of spectrograms with varying window lengths and orientations to provide a parameter-less time-frequency distribution having good joint time and frequency resolution at all angular orientations. The analysis window of a spectrogram is rotated relative to the frequency components of the signal by preprocessing using a Fractional Fourier Transform to form rotated window spectrograms. In particular, to form the rotated window spectrogram, the signal is initially pre-processed using a Fractional Fourier Transform of angle .alpha., the spectrogram time-frequency distribution of the pre-processed signal is then computed using analysis window h(t) and then rotated by angle -.alpha.. The geometric mean of a set of rotated window spectrograms, which are indexed by both the analysis window length and the angular orientation of the window relative to the signal's time-frequency features, is then computed to form a combination of rotated window spectrograms.
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Denson-Low W. K.
Dorvil Richemond
Duraiswamy V. D.
Hughes Electronics Corporation
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