KRETS FOER ALSTRING AV STYRSPAENNING FOER AKTIVERING AV EN STROEMNINGSREDUCERANDE KRETS I EN FM-STEREOMOTTAGARE

摘要

A high-cut and high-blend control voltage generating circuit for activating a noise reduction circuit of an FM stereo receiver is configured to be simply responsive to multipath noises and never to plug noises. A changing and discharging circuit in the control voltage circuit may have a relatively long charging time constant, and the voltage control circuit may be configured to be simply responsive to multipath noises above a predetermined level. Thus the circuit is much less liable to operate erroneously.