FM receiver with muting circuit
US5339463A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1990 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Oct 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
FM receiver including means for controlling the center frequency of an IF filter, which is relatively narrow-banded with respect to the channel bandwidth, in dependence on the desired modulation, the receiver including a signal processing unit comprising an IF unit and an LF unit for amplifying, frequency converting and demodulating the received FM signal, a circuit for changing the signal transmission characteristic of the IF and/or LF units, including a signal detection unit including circuits for detecting values characteristic of receiving or interference states, with the inputs of said circuits each being connected with a circuit point of the IF or LF unit carrying the signal to be processed, and outputs for signals characterizing receiving and interference states, a signal processing unit for the signal characteristic of receiving and interference states, said unit including at least one amplitude and/or threshold circuit whose inputs are connected with the outputs of the signal detection unit and a signal output unit for putting out the processed signals characteristic of receiving and interference states, respectively, as control signals to influence the processing characte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.