Digital telephone set capable of being simultaneously used by a

Details Digital telephone set capable of being simultaneously used by a Digital telephone set capable of being simultaneously used by a

1991-10-21

1993-01-26

Schreyer, Stafford D.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379428, 379165, 379187, H04M 102, H04M 172, H04M 902, H04M 1300

Patent

active

051827689

ABSTRACT:
In a digital telephone set connected to a digital data exchange through a transmission line, a plurality of handsets, which are mounted on a telephone body, are for converting input sounds into input analog speech signals and for converting output analog speech signals into output sounds. Connected to the handsets, a plurality of analog-to-digital converters converts the input analog speech signals into input digital speech signals. Connected to the handsets, a plurality of digital-to-analog converters converts output digital speech signals into the output analog speech signals. On the telephone body are mounted a set of dialling keys for producing a numerical signal. Connected to the dialling keys, a control device is for producing input control data in response to the numerical signal and is for producing an output control signal in response to output control data. Connected to the transmission line, the control device, the analog-to-digital converters, and the digital-to-analog converters, a multiplexing/demultiplexing circuit is for transmitting/receiving transmission/reception time division multiplexed signals to/from the digital data exchange through the transmission line. The multiplexing/demultiplexing circuit is for multiplexing the input digital speech signals and the input control data into the transmission time division multiplexed signal and for demultiplexing the reception time division multiplexed signal into the output digital speech signals and the output control data.

REFERENCES:
patent: 4107477 (1978-08-01), Morrison
patent: 5014302 (1991-05-01), Kappeler et al.

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