Human speech processing apparatus for detecting instants of glottal closure
First Claim
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1. An apparatus for processing a speech signal comprising:
- a filter for receiving said speech signal and for generating a filtered speech signal by deemphasizing a spectral fraction of said speech signal below a predetermined frequency;
an averaging circuit coupled to said filter for receiving the filtered speech signal and generating, through averaging in successive time windows, a time stream of average signal corresponding to time dependent intensity of said speech signal; and
a detector for selectively detecting a sequence of time instants of glottal closure by determining peaks of said time dependent intensity of said speech signal.
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Abstract
In the natural production of human speech, the instant of closure of the vocal cords occurs usually at well defined instants. These instants are used for speech processing, such as glottal synchronous processing or speech synthesis with observed natural vocal cord excitation signals. To detect the instants of glottal closure from an observed speech signal, the observed speech signal is high pass filtered, and a temporally localized aggregate of the number and amplitudes of peaks in the high pass filtered signal is determined for possible instants of glottal closure. The instants of glottal closure are determined as instants where the aggregate takes maximal values.
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11 Claims
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1. An apparatus for processing a speech signal comprising:
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a filter for receiving said speech signal and for generating a filtered speech signal by deemphasizing a spectral fraction of said speech signal below a predetermined frequency;
an averaging circuit coupled to said filter for receiving the filtered speech signal and generating, through averaging in successive time windows, a time stream of average signal corresponding to time dependent intensity of said speech signal; and
a detector for selectively detecting a sequence of time instants of glottal closure by determining peaks of said time dependent intensity of said speech signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification