Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1991-12-04
1993-11-30
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
379 94, 379 97, H04M 1100
Patent
active
052673022
ABSTRACT:
A facsimile system includes: a telephone apparatus; a facsimile receiving device for detecting a CNG (Calling Tone) signal, which follows a call request signal from a telephone exchange, on a telephone line, and receiving a facsimile data through the telephone line if the CNG signal is detected; a switching device for selectively connecting the telephone line to either the facsimile receiving device or the telephone apparatus; a device for controlling the switching device such that the switching device connects the telephone line to the telephone apparatus if the CNG signal is not detected by the facsimile receiving device while the telephone line is connected to the facsimile receiving device; and a device for generating a control signal if the CNG signal is not detected by the facsimile receiving device. The facsimile system also includes a pseudo-call requesting device connected to the generating device and the telephone apparatus for outputting a pseudo-call request signal, which is substantially same as the call request signal from the telephone exchange, to the telephone apparatus to make the telephone apparatus ringing when the control signal is inputted from the generating device.
REFERENCES:
patent: 4642697 (1987-02-01), Wada
patent: 4908851 (1990-03-01), Kotani et al.
patent: 4910764 (1990-03-01), Bowen
patent: 5046187 (1991-09-01), Takahashi
patent: 5086462 (1992-02-01), Oka
European Search Report issued Sep. 10, 1992, (EP91120853).
Hayashi Motohiko
Kotani Matahira
Chan Jason
Conlin David G.
Ng Jin F.
O'Connell Robert F.
Sharp Kabushiki Kaisha
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