JPS61121082U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing an embodiment of the video tape recorder of the present invention, FIGS. 2a to 2g are waveform diagrams for explaining the operation of the schematic block diagram shown in FIG. 1, and FIG. 3 is a rotation FIG. 4 is a plan view showing the arrangement of the heads; FIG. 4 is a plan view showing the tracing state of the rotating head on the magnetic tape during high-speed reproduction;
FIG. 5 is a waveform diagram showing the reproduction output of the rotary head and the head switching pulse during conventional high-speed reproduction. DESCRIPTION OF SYMBOLS 1...Output signal level comparison circuit, 2...Switching timing adjustment circuit, 3...Horizontal synchronizing signal separation circuit, 4...Head switching pulse generation circuit, 5...Switching switch.

Claims (1)

[Claims for Utility Model Registration] Two sets of two adjacent rotary heads are arranged to face each other, and these four rotary heads record and reproduce video signals on a magnetic tape. In a video tape recorder, during high-speed playback, the output signal levels of a pair of rotating heads running on the magnetic tape are compared, and a pulse is output every time the output signal levels of both become equal. and when the output timing of the pulse of the output signal level comparison means and the timing of the blanking part of the horizontal synchronizing signal do not match, synchronizing with the blanking part of the first horizontal synchronizing signal after the pulse is output. and head switching means for outputting a head switching pulse for switching the signal output of the two rotary heads.