Reception system for key telephone system

Details Reception system for key telephone system Reception system for key telephone system

1982-07-30

1984-12-25

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

179 90K, H04J 306

Patent

active

044908202

ABSTRACT:
A reception system for a key telephone system, in which a voice signal and a control signal having the form of a frequency shift signal are multiplexed in an intercom line for transmission. In accordance with the present invention, there is provided means for extending by a predetermined period of time the period of a first clock pulse at the time of a key service unit transfering from the transmitting state to the receiving state, so that the center of data transmitted may coincide with the readout timing for reception.
The means for extending is arranged so that it may apply a reset pulse to a reset terminal of a frequency divider of an oscillator for generating the lock pulses.

REFERENCES:
patent: 3699261 (1972-10-01), Tomozawa
patent: 4076964 (1978-02-01), Henrion et al.
patent: 4131854 (1978-12-01), Schollmeier
patent: 4133981 (1979-01-01), Kibler
patent: 4302831 (1981-11-01), Zemanek

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