Subcarrier signal generator for use in stereo tuners
US4506376A · kind A · utility
4Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Dec 16, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D1/2236
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
First and second rectangular signals which are 90.degree. out of phase with each other are derived by comparators and an RS flip-flop from a symmetrical triangular wave signal. The first rectangular signal is halved in frequency by a frequency divider, the output of which is supplied to an adder. The second rectangular wave signal is also delivered to the adder. An output from the adder is converted by a bandpass filter into a sine-wave subcarrier signal in synchronism with a stereo pilot signal in an FM stereo tuner. The first and second rectangular signals may be derived by a pair of D-type flip-flops from a pulse signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.