Apparatus for use in conjunction with lipreading by the profound

Details Apparatus for use in conjunction with lipreading by the profound Apparatus for use in conjunction with lipreading by the profound

1986-08-29

1989-02-28

Wong, Peter S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 41, 381 51, 3645135, 434112, G10L 500

Patent

active

048093297

ABSTRACT:
The profoundly deaf benefit in lipreading if the larynx frequencies of speech are presented to them by means of acoustic sine waves. In the present invention the sine waves required are generated using a microcomputer and analogue output circuits, with the microcomputer providing digital level samples for the required sine waves from a stored look-up table. The wide frequency range of sine waves required is achieved by omitting some samples in each cycle at high frequencies, and the wide range of output levels required is provided by employing two digital to analogue converters, one acting as an attenuator.

REFERENCES:
patent: 4187413 (1980-02-01), Moser
patent: 4368459 (1983-01-01), Sapora
patent: 4510936 (1985-04-01), Fourcin et al.
patent: 4520501 (1985-05-01), DuBrucq
patent: 4546383 (1985-10-01), Abramatic et al.
patent: 4621256 (1986-11-01), Rusk
patent: 4654636 (1987-03-01), Rusk
Rosen et al, "Voice Pitch as an Aid to Lipreading", Nature, vol. 291, May 14, 1981, pp. 150 to 152.
Walliker et al, "Signal Processing Hearing Aids for the Totally and Profoundly Deaf", Aug. 1985, Melbourne.
Fourcin et al, "A Speech Pattern Element Stimulation in Electrical Hearing", Aug. 29, 1983.

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