Telephone apparatus with a continuously-connected DC-isolated mo

Details Telephone apparatus with a continuously-connected DC-isolated mo Telephone apparatus with a continuously-connected DC-isolated mo

1993-10-13

1996-04-02

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

375222, 379 90, H04M 1100

Patent

active

055048072

ABSTRACT:
Telephone apparatus including a loudspeaker and a microphone, a speech transmission network that on the one side is coupled to the loudspeaker and the microphone and on the other side can be coupled to the telephone lines, and a modem having an input and an output, wherein the modem for AC-currents is directly coupled to the speech transmission network and for DC-currents is isolated from the speech transmission network. By these features it is possible to provide a telephone apparatus having the possibility of data-communication with as little as possible additional components, so that the telephone apparatus can be very low priced.

REFERENCES:
patent: 4300013 (1981-11-01), Rademaker
patent: 4987586 (1991-01-01), Gross et al.
patent: 5127046 (1992-06-01), Malm
J. R. Baird et al, "Optoelectronics as Applied to Functional Electronic Blocks", Proceedings of the IEEE, Dec. 1964, pp. 1529-1536.

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