| 摘要 |
<p>PURPOSE:To improve reliability by comparing time data generated from a timer circuit with the one superposed on a broadcast signal, and displaying an alarm to recommend the confirmation and correction of the actual time of the timer circuit when difference over a prescribed range is detected as a comparison result. CONSTITUTION:A comparator 5 compares effective time data outputted from an effective data decision circuit 13 with the time data outputted from the timer circuit 4, and outputs a preset pulse to a counter circuit 10 when the difference in both data is within the prescribed range, and outputs a count pulse to the circuit 10 when it exceeds the prescribed range. Here, the circuit 10 counts up a value when inputting the count pulse from the circuit 5, and performs a preset operation when inputting the preset pulse, and outputs a carry to a latch circuit 11 when a count value exceeds a prescribed value. The circuit 11 holds an inputted carry, and outputs a held carry to an alarm circuit 12. And the circuit 12 displays the fact that actual time data may or may not be incorrect while the carry is being outputted.</p> |
