Fax/telephone switching device

Details Fax/telephone switching device Fax/telephone switching device

1987-11-23

1989-11-07

Brigance, Gerald

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

H04M 1100

Patent

active

048797413

ABSTRACT:
A device used as a switching device between a telephone and a fax machine, especially for providing a general fax machine with a function of telephone connection including a calling circuit, a calling-detector circuit, a tone-detector circuit, a telephone-hold circuit and a telephone sounding circuit. Once a caller dials a fax number, the calling circuit and the tone-detector circuit start to detect the input signal. If the input signal is telephone-input, then the telephone-hold circuit holds the circut and a switch is triggered to make a telephone connection. Further, the telephone sounding circuit drives the buzzer of the telephone. Then the telephone switching is completed.

REFERENCES:
patent: 3591711 (1971-07-01), DeGroat
patent: 4562483 (1985-12-01), Kurokawa et al.
patent: 4815121 (1989-03-01), Yoshida

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