JPS56112190A - Signal recording circuit - Google Patents

Abstract

PURPOSE:To prevent generation of crosstalk by constituting an oscillating circuit of a recording circuit for a video tape recorder, which records SECAM system signals with a fixed oscillating circuit, detecting the phase inversion of an ID signal to make a low frequency conversion signal in-phase and eliminating the phase inversion of a carrier. CONSTITUTION:Comb line filter 24 which adds a chrominance signal generating a carrier signal of converter 22, which converts the frequency of the chrominance signal of an SECAM signal into low frequency, to its 2H delay signal is installed. On the basis of a horizontal synchronizing signal from synchronous separating circuit 26, ID flag circuit 28 outputs an ID signal sampling pulse and ID signal sampling gate 32 outputs an ID signal according to the output of filter 24. Then 1/3 counter 35 counts up a horizontal synchronizing signal which is synchronized with the ID signal or its relating signal and multiplying circuit 27 generates the output which is synchronized with the horizontal synchronizing signal and phase- advanced by 1/4 wave length. Then switching circuit 31 selects the input consisting of the output of circuit 27 and its inverted output at the output of counter 35, and frequency converting circuit 40 adds said selected signal to the output of fixed oscillating circuit 39.