A METHOD AND ELECTRONIC CIRCUIT FOR DETECTING AN ALTERNATING CURRENT COMPONENT

摘要

An electronic circuit for detecting an alternating current component of a signal has a maximum-hold detector (1) for holding a maximum signal level reached by the signal, a top detector (3) having a first input coupled to an output of the maximum-hold detector for inputting of the maximum signal level, the top detector having a second input for receiving the signal and having a comparator for comparing the signal to the maximum signal level and for outputting a top detection signal if the signal falls below the maximum signal level, and corresponding minimum-hold and dale detectors (2, 3) for producing an output signal being indicative of the presence of the alternating current component. The electronic circuit provides for the detection of the alternating current component irrespective of varying direct current components of the signal. The circuit can be employed for the detection of co-channel and / or multi path interference.