Facsimile/voice phone combined device producing DTMF oscillation

Details Facsimile/voice phone combined device producing DTMF oscillation Facsimile/voice phone combined device producing DTMF oscillation

1996-05-31

1998-12-15

Isen, Forester W.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 9305, 379 9326, 37910005, 37910014, 358442, 358443, 358468, H04M 1100

Patent

active

058504311

ABSTRACT:
In a facsimile/voice phone combined device of the type having a line interface circuit that includes a transformer for separating an electrical coupling between a telephone line and the combined device, the operator can push dial buttons while hearing the DMF oscillation sound from the speaker. When a dial button provided on a keyboard of a facsimile section is pushed, the first change-over switch connects the output terminal of a modem in the facsimile section to the line interface circuit, and the second change-over switch connects the speaker of a handset to the line interface circuit so that the DTMF signal from the modem is applied not only to the telephone line through the line interface circuit but also to the speaker.

REFERENCES:
patent: 5428674 (1995-06-01), Kawashima

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