Apparatus for use in conjunction with lipreading by the profoundly deaf
US4809329A · kind A · utility
2Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1986 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Aug 29, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B21/009
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.