| 摘要 |
<p>PURPOSE:To display with high accuracy the time during which a tape travels at a constant speed for the non-recording time and the time after the non-recording time, by displaying the tape travelling time of a constant speed and the time of the non-recording mode at a display part with switching. CONSTITUTION:A counter 7 has 6 times of overflow in a second. The output of an FF6 which is delivered with every 1/6sec is supplied to an arithmetic control circuit 1 and stored in a memory M1 of an RAM2 to be displayed at a display part 5 per second during which the output of the FF6 is fed 6 times. When a non-signal forming switch 12 is closed while the tape is travelling, the tape is muted and travels with no recording. At the same time, the value of the memory M1 is stored in a memory M2 with a command of the switch 12. Then the count value for the travelling time is stored in a memory MT. Thus the part 5 displays zero and then switched to the display for formation of a non-signal part. At the same time, a control circuit 9 reset the counter 7 to zero. Then the counter 7 starts counting at a moment when the switch is on to display the real time of no signal.</p> |
