FM Stereo demodulator for demodulating stereo signals directly from an FM intermediate frequency signal
US4502148A · kind A · utility
7Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1982 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Jun 25, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D1/2209
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is an FM stereo demodulator in which components of the demodulated signal corresponding to odd harmonics of the subcarrier signal are eliminated. In order to prevent the production of odd harmonics, the multiplication between positive and negative sinusoidal subcarrier signals is performed with a stereo pilot signal and positive and negative pulse train signals produced by pulse detection of an FM signal. The multiplication signals are further added with each other to directly reproduce left and right stereophonic signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.