MAGNETIC VIDEO RECORDING AND REPRODUCING DEVICE

摘要

PURPOSE:To obtain a head switch signal which is suited to a 4-hesd type magnetic video recording/reproducing device as well as the conversion into an IC, by switching the outputs of four magnetic heads with the output of 4-phase ring counter circuit. CONSTITUTION:A rotary head cylinder 3 contains magnetic heads 21 and 23 having an equal azimuth angle and magnetic heads 22 and 24 having azimuth angles opposite to the heads 21 and 23 set with a 90 deg. space. A magnetic tape 4 is wound round the cylinder 3 toward an arrow head 5 and at 270 deg. and then driven. Thus video signals are recorded or reproduces to the tape 4 by those heads 21-24. In a recording mode a signal S22 given from a PG7 which detects the revolving phase of the cylinder 3 is divided into 1/3 by a 1/3-dividing circuit 28. Thus a signal S23 is obtained. A signal S21 is supplied to a clock terminal of a 1/3-dividing circuit 29 from an FG6 which detects the rotary information of the cylinder 3. An output signal S23 of a 1/3-dividing circuit 29 from an FG6 which detects the rotary information of the cylinder 3. An output signal S23 of a 1/3- dividing circuit 28 is supplied to a reset terminal of the circuit 29. An output signal S24 of the circuit 29 is supplied to a delay circuit 30.