Compression of stored waveforms for artificial speech

Details Compression of stored waveforms for artificial speech Compression of stored waveforms for artificial speech

1987-02-12

1989-05-23

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

381 31, 381 35, G10L 500

Patent

active

048337188

ABSTRACT:
In a digital text-to-speech conversion system of the type usually contained in all-software form on a floppy disk, memory requirements for the storage of digitized waveform samples are reduced while speech quality is improved, by providing compression techniques and anti-distortion techniques which interact to provide clear speech at widely varying speeds with a minimum of memory. These techniques include using Huffman coding of first- or second-order differences, encoding only differences between successive waveforms where feasible, using a demi-diphone organization of the speech to allow use of the same instruction lists for several sounds, selectively deleting or repeating waveforms in the concatenation to vary speed without affecting pitch, and encoding waveforms linearly or anti-logarithmically for storage while converting the stored linear or anti-logarithmic codes to logarithmic codes such as .mu.-law codes upon retrieval.

REFERENCES:
patent: 4382160 (1983-05-01), Goslung et al.
patent: 4692941 (1987-09-01), Jacks et al.
patent: 4703505 (1987-10-01), Seiler et al.
patent: 4709340 (1987-11-01), Capizzi
patent: 4718087 (1988-01-01), Papamichalis
patent: 4730348 (1988-03-01), MacCriskin

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