Telephone subscriber station

Details Telephone subscriber station Telephone subscriber station

1980-10-16

1982-02-23

Britton, Howard

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455617, H04B 900

Patent

active

043172342

ABSTRACT:
A multifrequency signaling method is provided between a cordless hand set and a base set which normally operates with audio frequency/pulse phase modulation and pulse phase modulation/audio frequency conversion. The cordless hand set is provided with a dialing device and a frequency generator for providing frequency combinations corresponding to dialed digits or special characters. In the base set a monitoring circuit monitors the existence of optical transmission channels between the hand set and the base set and causes disconnection after a loss of such channels for a predetermined interval. The base set also includes a converter for converting the multifrequency signals to dial pulse signals and a special character evaluation circuit for providing corresponding signals to control various functions such as signaling a secretary, through connection of a call and disconnection of a call.

REFERENCES:
patent: 3710122 (1973-01-01), Burcher

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