Dual frequency FM receiver
US3974450A · kind A · utility
6Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1975 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Jul 16, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiver is disclosed which will receive signals on either one of two closely spaced frequencies. The receiver is of the superheterodyne type and has a local oscillator frequency midway between the two frequencies which the receiver is tuned to. The receiver also includes a tone squelch circuit which mutes the audio unless a tone is received for a period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.