Pitch synchronized sinusoidal synthesizer

Details Pitch synchronized sinusoidal synthesizer Pitch synchronized sinusoidal synthesizer

1997-09-15

2000-02-22

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

704264, G10L 916

Patent

active

060291338

ABSTRACT:
A pitch synchronous sinusoidal synthesizer for multi-band excitation vocoders will produce excitation signals necessary to artificially mimic speech from input data. The input data will contain the pitch frequencies for current and previous synthesizing frame samples, starting phase information for all harmonics within the current synthesizing frame sample, magnitudes for each of the harmonics present within the current synthesizing frame sample, the voiced/unvoiced decisions for each of the harmonics within the current frame sample, and an energy description for the harmonics of the current synthesizing frame sample. The pitch synchronous sinusoidal synthesizer will produce the synthetic speech with a minimum of the distortion caused by the sampling and regeneration of the speech excitation signals. The pitch synchronized sinusoidal synthesizer has a plurality of pitch interpolators. The pitch interpolators will calculate the pitch periods and frequencies, the pitch magnitudes of all harmonics present in the frame sample, and the ending phase for each pitch period. The results from the interpolator are transferred to a bank of sinusoidal resonators. The sinusoidal resonators will produce the sinusoidal waveforms that compose the speech excitation signal. The plurality of waveforms are transferred to a gain shaping function which will sum the sinusoidal waveforms and shape the resulting signal according to an input description of the signal energy.

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