Gain control device of video signal reproducing apparatus

Claim 1

A gain control circuit for a video signal reproducing apparatus comprising a plurality of transducers to reproduce recorded video signals, said circuit comprising: A. a plurality of variable gain circuits each connected to a respective one of said transducers to receive reproduced video signals therefrom; B. means to separate a predetermined signal from the reproduced video signals; C. an amplitude detector circuit connected to the signal separating means; and D. a plurality of series circuits corresponding in number to the number of said transducers and each comprising a capacitor and a switching element connected in series, all of the series circuits being connected in parallel to a common junction to form a parallel circuit, said common junction being connected to the output of the amplitude detector circuit to have the output voltage of the detector circuit impressed across the parallel circuit, said common junction being further connected to all of the variable gain circuits to simultaneously suppply said detector circuit output to all of said variable gain circuits to control the gains thereof, and means for selectively energizing each switching element in each of the series circuits to cause each of the series circuits to be conductive only when a reproduced video signal from the respective transducer corresponding to the series circuit is applied to the respective variable gain circuit so that the voltage at said common junction is substantially the same during transition intervals between respective transducer outputs.