Patent ID: 8744027

Claim:
An infrared receiver circuit for the reception of a carrier modulated infrared signal which includes a carrier signal and a wanted signal ( 211 ) modulated onto the carrier signal, with a bandpass filter ( 13 , 113 ) with a frequency setting terminal ( 19 , 119 ) via which the center frequency of the band of the bandpass filter ( 13 , 113 ) can be set, furthermore with a demodulator ( 15 , 115 ) for the recovery of the wanted signal ( 211 ) and with a signal output ( 17 , 117 ) at which the demodulated wanted signal ( 211 ) can be output, the infrared receiver circuit ( 11 , 111 ) comprising a signal input ( 21 , 121 ) which is connected at least indirectly to the frequency setting terminal ( 19 , 119 ) of the bandpass filter ( 13 , 113 ) so that the center frequency of the band of the bandpass filter ( 13 , 113 ) can be set by a clock pulse signal of an external clock pulse generator ( 31 , 131 ), wherein an electrical oscillator ( 125 ) arranged between the signal input ( 121 ) and the bandpass filter ( 113 ) is provided, with the oscillator ( 125 ) being made to generate a frequency setting signal for the bandpass filter ( 113 ) in accordance with the clock pulse signal of the external clock pulse generator ( 31 , 131 ), and wherein the oscillator ( 125 ) is made also still to generate the frequency setting signal in accordance with the external clock pulse signal when the external clock pulse signal is interrupted or is omitted.