Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1997-06-06
1999-09-07
Loomis, Paul
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
37910015, 358442, H04M 1100
Patent
active
059498587
ABSTRACT:
An emulation circuit for emulating the signals, impedances and decoding functions of a telephone network provides a substitute direct connection between a computer and a local facsimile device. The facsimile device can then be used as a printer or scanner, depending on the direction of transmission. The touch tone dialing sequence decoding is simplified in the circuit to a single bandpass filter stage which passes only a dual tone combination corresponding to a single numerical digit and it is this number that is entered as the last digit of the automatic dialing sequence. In this manner the functions of the computer or the fax are not disturbed and the last digit then enables a ring signal. On circuit completion, the line signal may be suppressed for a period corresponding to the transmission period of the header.
REFERENCES:
patent: 4964154 (1990-10-01), Shimotono
patent: 4991200 (1991-02-01), Lin
patent: 5528385 (1996-06-01), Manning
patent: 5530558 (1996-06-01), Nachman
patent: 5588047 (1996-12-01), Rosengren et al.
Loomis Paul
Ramakrishnaiah Melur
LandOfFree
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