FM receiver
US5287557A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1990 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Oct 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1669
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An FM receiver includes an IF unit followed by an LF unit, the IF unit having an IF filter arrangement. The center frequency of the IF filter arrangement, which is relatively narrowbanded with respect to the channel bandwidth, is controlled as a function of receiving conditions. The receiver has circuitry for changing the signal transmission characteristic of the IF and/or LF unit, including a detector module for detecting signals characterizing various receiving states, a signal processing unit which changes the amplitude or the time values of signals from the detector module, and a signal linkage unit to create output signals by way of logic and/or time dependent linkage of signals outputted by the signal processing unit. The signal linkage unit is part of a signal output unit for outputting processed signals to individual stages of the IF or LF unit based on the output signals of the signal linkage unit, whereby the control signals are directed to at least one of the switching stages as an input signal which influences the control of the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.