FM Stereo demodulation circuit
US4489430A · kind A · utility
2Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1982 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Aug 17, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse position modulated (PPM) signal is derived from an input FM signal, and first and second switching signals are derived which are opposite in phase and correspond to alternating half cycles of the PPM signal. First and second opposite phase subcarrier signals are derived synchronized to the pilot signal in the input FM signal, and various combinations of the switching and subcarrier signals are multiplied together and the multiplication products combined to obtain left and right channel outputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.