| 摘要 |
PURPOSE:To simplify an operation to send a tone signal by applying the 2nd ON operation of a PTT switch within a prescribed time so as to send a tone signal. CONSTITUTION:An operation signal (a) of a PTT switch 5 is given to a delay circuit 10, an operation detection circuit 11, an OFF operation detection circuit 12 and a transmission circuit 3. Then a delay signal (b) being the result of retarding the signal (a) by a time t1 is given to a counter circuit 13 and the count operation is indicated in response to the ON operation. The circuit 13 gives a signal (c) to an AND circuit 14 during the time count. Moreover, the circuit 11 gives a pulse signal (d) to the circuit 14 when the switch 5 is in on- operation. The circuit 14 outputs a signal (e) being ANDing the signal (d) from the ON operation detection circuit 11 and a signal (c) from the circuit 13 and gives it to the control circuit 15. When the 2nd ON-operation is applied within a prescribed time, the circuit 15 generates a tone signal in a tone signal generation circuit 14 by the signal of the circuit 11 outputting the signal. |
