(US4628371-A)      The compensator is incorporated in a system for playing back main channel signals and sub channel signals from a recording medium, the signals having been recorded in the form of a multiplex signal.    A drop-out sensor generates a drop-out signal to be applied to a drop-out compensator circuit provided in a transmission line of a playback main channel signal.    A delay circuit is connected to the drop-out sensor for generating a second drop-out sensor signal to be applied to a second drop-out compensator circuit provided in a transmission line of a playback sub channel signal.    ADVANTAGE -   Reduced power consumption.    (6pp)    (GB2132405-B)      A drop-out compensator device for a system for playing back a main channel signal and a sub channel signal from a recording medium, which signals having been recorded by passing through a step for superposing a sub carrier signal modulated by the sub channel signal on the main signal, comprising: a drop-out sensor for sensing the presence of a drop-out of a signal from said recording medium and producing a drop-out sensor signal; means for producing a playback signal including components of said main channel signal and said sub channel signal, from said recording medium; separating means connected to said means for producing a playback signal, for separating said main channel signal from said playback signal, said separating means having delay characteristics of a first delay time; a first drop-out compensator connected to said separating means, for compensating for a drop-out of said main channel signal in accordance with said drop-out sensor signal; demodulating and separating means connected to said means for producing a playback signal, for demodulating and separating said sub channel signal from said playback signal, said demodulating and separating means having a delay characteristics of a second delay time longer than said first delay time; delay means (30, 31) responsive to said drop-out sensor signal, for producing a second drop-out sensor signal by delaying the transmission of said drop-out sensor signal, said delay of transmission being substantially equal to the difference between said first delay time and said second delay time a second drop-out compensator (29) connected to said demodulating and separating means, for compensating for a drop-out of said sub channel signal in accordance    with said second drop-out sensor signal.