Automatic data/voice sending/receiving mode switching device

Details Automatic data/voice sending/receiving mode switching device Automatic data/voice sending/receiving mode switching device

1987-06-08

1989-10-10

Brigance, Gerald

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

3701101, H04M 1100

Patent

active

048737151

ABSTRACT:
A terminal device sends/receivers data and voice signals through a low speed circuit to/from another device, while switching automatically data and voice signals. The terminal device comprises a data sender/receiver, a voice sender/receiver, a modulator/demodulator, and an automatic mode switch. The automatic mode switch includes a circuit disposed beteen the data sender/receiver and the modulator/demodulator for detecting special data such as flags from received data coming from the modulator/demodulator, a circuit for making a logical product of the output of this detecting circuit and a detection signal of the received carrier and means for separating the voice sender/receiver from the circuit and transmitting a sending request for data sending/receiving use. Further switching over from the voice sending/receiving mode to the data sending/receiving mode is effected by key operations, etc.

REFERENCES:
patent: 4009342 (1977-02-01), Fahrenschon et al.
patent: 4178480 (1979-12-01), Carbrey
patent: 4306116 (1981-12-01), McClure et al.
patent: 4546212 (1985-10-01), Crowder, Sr.
patent: 4685123 (1987-08-01), Hsia et al.
patent: 4716562 (1987-12-01), Carse et al.
Kitami et al., "INS User-Network Interfaces", Review of the Electrical Communications Laboratories, vol. 33, No. 5, 1985, pp. 767-774.

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