Importance

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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 characteristic of the signal processing unit to individual stages of the IF or LF unit, with inputs of the signal output unit being connected with outputs of the signal processing unit and the outputs of the signal output unit are connected with control inputs of stages of the IF and LF unit.

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First Claim