Patent ID: 7236743

Claim:
Method for interference suppression by means of a quality-adjustable bandpass filter ( 23 ) in a receiver circuit for carrier-modulated received signals (S in ), in which the bandpass filtered received signal (B out ) is demodulated, and a switching process is triggered with the demodulated received signal (D out ), characterized in that a quality reduction of the bandpass filter ( 23 ) is correlated with the switching process, as the demodulated received signal (D out ), a first rectangular pulse corresponding to the envelope curve of the carrier-modulated received signal (S in ) is generated for triggering the switching process, and dependent on one of the edges of the first rectangular pulse (D out ), a phase shifted second rectangular pulse (D tqr ) is derived as a control signal ( 72 ) for the quality reduction of the bandpass filter ( 23 ).