| 摘要 |
<p>PURPOSE:To vary the tape speed in case an after-program is equal to a tape program and to perform the time correction within said program, by providing an arithmetic means which calculates automatically the delay or gain of time from the broadcast time point of the present program and the end time point of the program. CONSTITUTION:An arithmetic circuit 1 performs an arithmetic of (B-A+C) when the present time point A, the program end time B and the program time C applied to input terminals T1-T3 respectively are supplied. The calculated time is converted into the address value of an ROM by an address converting circuit 2, and the speed set value is delivered from an ROM3 and supplied to a program counter 4 in a servo circuit. For example, the calculated 10 seconds are corrected within 14 minutes and 50sec. In such a case, the counter output is set at 60.66Hz since the oscillation frequency of a reference crystal oscillating circuit 5 is set at 600kHz. Thus the tape speed is incresed by 1.0035. The output of the counter 4 drives a capstan motor 8 through a phase detecting circuit 6 and a capstan drive amplifier 7.</p> |
