DOUBLE SIDE BAND SUPPRESSED CARRIER DETECTOR USING AN ENVELOPE AND FM DETECTOR

摘要

1471578 Detector circuits J A ADCOCK 15 July 1974 [19 July 1973] 31200/74 Heading H3T In a detector for suppressed carrier, double sideband signals the signal is applied to an envelope detector, and to a frequency modulation detector, the envelope detector providing outputs in erect and inverted form, one or the other of which is selected by switching means controlled in accordance with output from the frequency modulation detector. As described one F.M. detector produces a pulse whenever the modulating signal crosses the zero value, and this pulse is amplified in a pulse amplifier and applied to reverse a flip-flop which controls the switch. The Specification illustrates detailed circuits (Figs. 3A, 3B, not shown).