Facsimile apparatus controlled by DTMF signals

Details Facsimile apparatus controlled by DTMF signals Facsimile apparatus controlled by DTMF signals

1992-05-11

1994-06-21

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358437, H04M 150

Patent

active

053232461

ABSTRACT:
Disclosed a facsimile apparatus that combines copying with transmission. An external telephone is connected to it to be remotely controlled by a remote signal including at least one DTMF signal from the external telephone. And, there is provided means for comparing the tone duration of the tone-pair signal having DTMF frequencies sent by the external telephone with a predetermined detection time, and deciding whether or not said tone-pair signal is a valid DTMF signal used for remote signals based on the compared result. Further, there is provided means for estimating the tone duration of DTMF signals that is specific to the external telephone, and setting the optimum detection time.

REFERENCES:
patent: 4313038 (1982-01-01), Nilssen et al.

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