Stereo inhibit circuit
US3999132A · kind A · utility
13Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1975 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Oct 31, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/34
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A stereo inhibit circuit adaptable for use in an FM stereo radio having a stereo indicating light is disclosed. A level detector and a mute circuit develop a mute signal which is related to the amount of signal noise at the output of an FM detector. This mute signal is used to inhibit a stereo switch that controls the stereo indicating light while permitting the creation of audible signals by a stereo demodulator and a pair of speakers. Thus the stereo inhibit circuit permits the creation of an audible hiss and positively prevents any flickering of the stereo indicating light when the FM radio is not tuned to a station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.