Receiver with multipath interference dependent mono-stereo detector

摘要

Receiver comprising a multipath detector providing signal pulses at the occurrence of multipath interferences coupled to control signal generating means supplying a mono-stereo control signal to the stereo signal processing means for a transition of the stereo signal processing means between a stereo and a mono mode. To provide for an adequate multipath dependent mono-stereo transition said signal pulses are being supplied as a first mono-stereo control signal component to a first input of the control signal generating means as well as to signal averaging means for averaging said multipath interferences over a predetermined averaging interval supplying an average level signal to a threshold circuit. This threshold circuit is coupled to a timing circuit, supplying a second mono-stereo control signal component to a second input of the control signal generating means, said second mono-stereo control signal component being reset from a stereo level to a mono level when the output signal of the signal averaging means increases above a predetermined threshold value and being set to increasingly approach with time said stereo level when said average level signal decreases below said predetermined threshold value, the momentary level of the mono-stereo control signal being determined by the one of both first and second mono-stereo control signal components nearest to said mono signal level. <IMAGE>