Compression of stored waveforms for artificial speech

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

1986-11-18

1989-07-25

Shoop, Jr., William M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 34, 381 52, 341 59, 341 65, G10L 302

Patent

active

048521680

ABSTRACT:
In a digital text-to-speech conversion system of the type usually contained in all-software form on a floppy disk, memory requirements 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 to advantage by encoding only differences between successive waveforms where feasible, relocating delta tables and using them repetitively, using a demi-diphone organization of the speech to allow use of the same instruction lists for several sounds; and combining selective deletion or repetition of waveforms with selective interpolation to vary speed without slurring.

REFERENCES:
patent: 4396906 (1980-11-01), Weaver
patent: 4617645 (1986-10-01), Sprague
patent: 4692941 (1987-09-01), Jacks et al.
patent: 4718087 (1988-01-01), Papamichalis
patent: 4720861 (1988-01-01), Bertrand

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