Method of speech synthesis by means of concentration and partial

Details Method of speech synthesis by means of concentration and partial Method of speech synthesis by means of concentration and partial

1995-09-15

1998-06-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

704218, G10L 912

Patent

active

057748551

ABSTRACT:
A synthesis method in which that part of each interval of the original signal which contains the fundamental information is left unchanged, and only the remaining part of the interval is altered. In this way, not only is processing time reduced, but the natural sound of the synthetic signal is also improved. The main part of the interval is an exact reproduction of the original signal. At least the waveforms associated to voiced sounds are subdivided into a plurality of intervals, corresponding to the responses of the vocal duct to a series of excitation impulses of the vocal cords, synchronous with the fundamental frequency of the signal. Each interval is subjected to a weighting. The signals resulting from the weighting are replaced with a replica thereof shifted in time by an amount that depends on a prosodic information. The synthesis is then carried out by overlapping and adding the shifted signals. In each interval of original signal to be reproduced in synthesis, an unchanging part is identified, which contains the fundamental information and which is reproduced unaltered in the synthesized signal, and the operations of weighting, overlapping and adding involve only the remaining part of the interval. The search utilizes searching among all zero crossings for a suitable division between the unchanging and variable parts.

REFERENCES:
Speech Communication 9(1990) pp. 453-457 Pitch Synchronous Waveform Processing Techniques . . . Dec. 1990.
T. Hirokawa, Segment Selection and Pitch Modification--pp. 337 to 340 (Japan) Nov. 1990.
K. Itoh, Phoneme Segment Concatenation and Excitation Control . . . --pp. 189-192 Nov. 1990.
E. Moulines et al; "Pitch-Synchronous Waveform Processing Techniques for Text-to-Speech Synthesis Using Diphones"; Speech Communication, vol. 9, No. 5/6, Dec. 1990, pp. 453-467.

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