Video tape recorder including tracking apparatus

Claim 1

A video signal reproducing apparatus for reproducing video signals from a magnetic tape on which video signals are recorded as video tracks inclined at an angle with respect to the lengthwise direction of said magnetic tape, said apparatus comprising a tracking device having video heads for scanning said video tracks to obtain reproducing signals, electric-mechanical transducer means for moving said video heads in a direction perpendicular to the scanning direction of said video-tracks, a demodulator for demodulating said reproduction signal to obtain reproduced video signals', a vertical synchronizing detector circuit for separating vertical synchronizing signals from said reproduced video signals, a pulse processing circuit for detecting 'rotary phases of said video heads, a time-voltage conversion circuit for converting into voltage cycles of said vertical synchronizing signals by means of said rotary phases of said video heads derived from said pulse processing circuit, a holding circuit for holding output voltage of said time-voltage conversion circuit, a level comparison circuit for comparing output voltages of said time-voltage conversion circuit and of the holding circuit, a control voltage generating circuit for comparing the output of said level comparison circuit with a reference voltage and generating voltage when said reference voltage and output voltage are not coincident with each other, a tracking control signal generating circuit for controlling said video head positions, and an adder for adding an output signal from said control voltage generating circuit with an output signal from said tracking control signal generating circuit, and generating a signal for application to said electric-mechanical transducer, thereby allowing said video heads to scan video tracks.