| 摘要 |
<p>PURPOSE:To record easily a tape position signal and to make it unnecessary to record a special signal as a tape position signal, or to provide an exclusive fixed head, by setting the running speed of a magnetic tape to 1/2 comparing with the time of running at a constant speed, or setting a revolving speed of a rotary drum provided with a rotary head, to two times, when recording drum provided with a rotary head, to two times, when recording the tape position signal. CONSTITUTION:When a signal to an input terminal 27B is set to a '0' level, a signal (tape position signal) from a recording amplifier 8 is supplied to only a rotary head 2A through a rotary transformer 13A. In this case, in accordance with '0' of a servo-system control signal, a switch 29 is turned on to a contact 29b, an FG output from an FG multiplying circuit 28 is provided to a capstan motor servo-circuit 22, and by a capstan motor driver 23, a capstan motor 24 is rotated at the speed of 1/2 of a constant speed, and a magnetic tape is run at the speed of 1/2 of running at a constant run. In this way, while signals to input terminals 27A, 27B are '1' and '0', a tape position signal is recorded continuously onto the magnetic tape by only the rotary head 2A.</p> |
