| 摘要 |
PURPOSE:To constitute a titled telephone set so that a dial signal is not sent out and the other party side is not displeased, even if a dial switch 5 is operated on purpose or by mistake in a holding state, by constituting said set so that a dial function is stopped in the holding state. CONSTITUTION:In a holding state, a contact 10a of a holding switch is operated, and by connecting one end of a vibrator 4-6 connected to a clock circuit 4-5 to one end of a power source, the potential of its one end is fixed, therefore, the clock circuit 4-5 stops its operation, and accordingly, even if a dial switch 5 is operated, a dial signal cannot be sent out. A reference clock oscillating operation of a clock generating circuit is inhibited, but it will do that a switch for executing this inhibition is a semiconductor element, etc. for executing a switching operation by a power source (not shown in the figure) of a holding tone source circuit 9. |
