Automatic frequency control system
US3965423A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1974 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | Jul 17, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A superheterodyne f.m. receiver having a manually tunable local oscillator which is electronically voltage tunable over a small range, and including a frequency discriminator for providing signal voltage and a.f.c. voltage in response to a received f.m. carrier, wherein is provided an electronic bipolar switch responsive to either positive or negative a.f.c. voltage of greater than a predetermined value for effecting grounding of a point of an a.f.c. circuit which applies a.f.c. voltage to the local oscillator, and which also includes an interchannel noise detector which also provides grounding signal for that same point of the a.f.c. circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.