| 摘要 |
A receptor circuit with means for compensating, as a function of the effective modulation, for the medium frequency of an IF filter (2, 6, 10, 11) having a relatively narrow band compared with the channel-band width includes a circuit for modifying the signal transmitting characteristic of the IF and/or LF part, which comprises a signal recognition part (28) with circuits (29-33) for determinig values characterizing receptor and interference conditions, the inputs of which are each linked with a circuit point of the IF or LF part containing the signal to be processed, and with outputs for signals characterizing receptor or interference conditions. Said receptor circuit also comprises a signal regeneration part (600) for signals characteristic of receptor or interference conditions, with at least one amplitude-threshold or time-threshold circuit, the inputs of which are connected to the outputs of the signal recognition part (28), and a signal emitting part (200, 400) for sending to individual stages of the IF or LF part the regenerated signals characteristic of receptor or interference conditions as control signals for influencing the processing characteristic of the signal processing part. Inputs of the signal emitting part (200, 400) are connected to outputs of the signal regenerating part (600). The filter compensation is switched off if a predetermined bounce in the IF signal and/or in one of the signals encompassing the lower LF range is exceeded. |
