Card-like device having a microprocessor and speaker for communi

Details Card-like device having a microprocessor and speaker for communi Card-like device having a microprocessor and speaker for communi

1989-10-30

1991-02-19

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379418, H04M 127

Patent

active

049950770

ABSTRACT:
A card-like device having a microprocessor and a speaker to communicate with telephone line, the device also including a single switch which when depressed by a user first activates the device and then causes a DTMF signal to be generated.

REFERENCES:
patent: 4126768 (1978-11-01), Grenzow
patent: 4817135 (1989-03-01), Winebaum
patent: 4882750 (1989-11-01), Henderson et al.

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