| 摘要 |
<p>PURPOSE:To generate a searching signal having a stable duty ratio with a simple constitution by synchronizing the switching position of an index signal transmitted from a system control part with a record control (REC CTL) signal. CONSTITUTION:The duty ratio of the searching signal of a REC CTL signal is decided according to the output of a counter 6 for counting two types of count values. This output is supplied to a decoder 4, controlled by the index (INDEX) signal passing a FF 5 from the synchronized system control part to switch the duty ratio. The output of the counter 6 selected by the decoder 4 is supplied to a latch circuit 3 to reset a FF 2 and the output of the FF 2 having the REC CTL signal passing through a temperature compensating delay circuit 1 as an input signal becomes the searching signal having the respective duty ratios synchronizing with the index signal. Accordingly, the searching signal having the stable duty ratio can be generated with the simple constitution.</p> |
