| 摘要 |
<p>PURPOSE:To eliminate the possibility of malfunction without changing a duty even when a conventional system to transmit a bit of control information by the change of the duty is used commonly, by recording the bit of control information by changing the leading gradient of a control signal. CONSTITUTION:A phase detecting pulse (a) is inputted to a pulse arranging circuit 6, and after being waveform-arranged to a control pulse (b) consisting of a rectangular wave formed in advance, it is inputted to a switching circuit 7. When a code set as program searching, etc., is attached, by generating a switching pulse (c) which rises in the period of the low level of the pulse (b) corresponding to the depression of a switch 11 and continues only for a prescribed time t0 from a switching pulse device 12, and inputting the pulse (c) to the switching circuit 7, a contact is switched to a contact 7b only for a time to seconds, and the pulse (b) from the pulse arranging circuit 6 is inputted to an integration circuit 13 and a gate circuit 14. A signal (d) having gradient parts in which the leading and trailing edges of the circuit 13 are inclined is inputted to an adder circuit 16. The output of the circuit is inputted to the circuit 14, and a signal (e) from which the gradient part of the trailing edge is eliminated can be obtained as a gate signal.</p> |
