Fully-integrated telephone unit

Details Fully-integrated telephone unit Fully-integrated telephone unit

1990-12-03

1993-03-30

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379388, 379389, H04M 160

Patent

active

051990644

ABSTRACT:
A single integrated circuit forms a hands-free telephone unit for use in a digital telephone network and in association with an external keypad, an external microprocessor, an external microphone, and an external speaker. The integrated circuit includes a keypad monitor arranged to provide digital key code signals, an audio processor for supporting hands-free operation, and a digital interface to provide a digital interface between the integrated circuit and the digital network and the external microprocessor.

REFERENCES:
patent: 4560840 (1985-12-01), Hansen
patent: 4613730 (1986-09-01), Fechalos et al.
patent: 4677661 (1987-06-01), van Gillawe et al.
patent: 4796287 (1989-01-01), Reesor et al.
patent: 4939774 (1990-07-01), Sawada

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