| 主权项 |
1. 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.
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