Video signal record/playback device

Claim 1

A comb filter device for a video signal record and playback device comprising: a superposed filter including first delay means arranged to be supplied with an input video signal in a format containing a luminance signal and a color signal which are , one on the other in a frequency-interleaving manner, said first delay means having a first output terminal having a delay time and a second output terminal having a delay time τ=1/(2F sc ), where F sc is a central frequency of the color signal, n=0, 1, 2, . . , H=the horizontal scanning period and τ=a constant, second delay means arranged to be supplied with a said input video signal and having a delay time of τ; adding means for adding together the output signal of said second delay means and the output signal of said first output terminal; and subtracting means for subtracting the output signal of said second delay means from the output signal of said first output terminal; phase-inverting means for adding together the signals at said first and second terminals of said first delay means; playback video signal processing means for producing, in a playback mode, a playback video signal having the superposed format; drop-out detecting means, for generating control signals indicative of a drop-out period and of a non-drop-out period; and switch means operable in response to the drop-out control signals, for selecting a record video signal having the superposed format in a record mode, for selecting said playback video signal during a non-drop-out period in the playback mode, or for selecting the output video signal from said phase inverting means during a drop-out period in the playback mode, and for applying the selected signal to said comb filter.