TRACKING SYSTEM OF MAGNETIC VIDEO RECORDING AND REPRODUCING DEVICE

摘要

PURPOSE:To eliminate the division processing which is accordant with the quick traversing ratio with a helical scan VTR, etc. by producing a tracking control signal of a quick traversing mode from the reference signal of a rotary magnetic head and the tracking control comparison signal. CONSTITUTION:In a quick traversing mode NAND gates 12 and 16 to which the reproduction control signal obtained by reproducing the tracking control comparison signal is applied are controlled by the switch pulse of the reference signal of a rotary magnetic head of a 30Hz clock producing circuit and the switch pulse passed through an inverter 15 after a switch is changed over. An RS type FF consisting of NAND gates 13 and 17 is controlled by the NAND gates 12 and 17. As a result, the 30Hz reproduction control signal of normal mode as well as the 30Hz tracking control signal of quick traversing mode are produced assuredly with a simple constitution and without carrying out any division processing accordance with the quick traversing ratio.