Interpolating between representative frame waveforms of a predic

Details Interpolating between representative frame waveforms of a predic Interpolating between representative frame waveforms of a predic

1996-03-08

1999-03-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

704207, 704223, 704261, G10L 904

Patent

active

058901183

ABSTRACT:
A speech synthesis apparatus includes; a memory for storing a plurality of typical waveforms corresponding to a plurality of frames, the typical waveforms each previously obtained by extracting in units of at least one frame from a prediction error signal formed in predetermined units, a voiced speech source generator including an interpolation circuit for performing interpolation between the typical waveforms read out from the memory means to obtain a plurality of interpolation signals each having at least one of an interpolation pitch period and a signal level which changes smoothly between the corresponding frames, a superposition circuit for superposing the interpolation signals obtained by the interpolation circuit to form a voiced speech source signal, an unvoiced speech source generator for generating an unvoiced speech source signal, and a vocal tract filter selectively driven by the voiced speech source signal outputted from the voiced speech source generator and the unvoiced speech source signal from the unvoiced speech source generator to generate synthetic speech. Further, interpolation positions can be determined bases on the pitch period.

REFERENCES:
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patent: 4937873 (1990-06-01), McAulay et al.
patent: 5119424 (1992-06-01), Asakawa et al.
patent: 5517595 (1996-05-01), Kleijn
W. B. Kleijn, et al., "Methods for Waveform Interpolation in Speech Coding", Digital Signal Processing vol. 1, No. 4, (pp. 215-230), 1991.

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