Control of a key telephone system using a pulse width modulated

Details Control of a key telephone system using a pulse width modulated Control of a key telephone system using a pulse width modulated

1983-05-13

1985-04-30

Schreyer, Stafford D.

179 81R, H04M 172

Patent

active

045145970

ABSTRACT:
In a signal transmission system of a key telephone system of the type comprising a main device connected to office lines and having an input/output port for transmitting and receiving signals, and a plurality of key telephone sets connected in parallel to the main device through a pair of signal lines for transmitting and receiving various control signals between the main device and the key telephone sets, wherein each of the control signals is constituted by a pulse width modulated time series signal of a predetermined number of bits, respective control signals are inputted and outputted in parallel to and from a bit input/output of the input/output port and wherein transmission and reception of the control signals between the main device and respective key telephone sets are simultaneously performed by parallel input/output operations of the calculating processing unit.

REFERENCES:
patent: 4234765 (1980-11-01), Sekiguchi
Australian Patent Publication No. AU-B-60038/80.

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