| 摘要 |
The apparatus is for generating display signal for a call from the stationary to a PBX. The apparatus includes a DC/DC converter(10) for converting a subscriber's line voltage of 48V to 5V signal, a DTMF receiver(11) for converting DTMF tone signal to digital signal, a ROM(19) for storing an operating program, a latch controller(21) for generating a latch enable signal according to control signal transmitted from a CPU(12), a latch(22) for generating buzzer enable signal and for driving LEDs connected to the latch(22), and a clock signal generator(23) for generating operating clock signals.
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