Facsimile machine having an output level adjusting function

Details Facsimile machine having an output level adjusting function Facsimile machine having an output level adjusting function

1988-01-21

1989-09-19

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

358469, 332117, H04B 104

Patent

active

048688525

ABSTRACT:
A facsimile machine includes a MODEM, an attenuator, an NCU and a controller. A signal from the MODEM is adjusted in level by the attenuator under the control of the controller and then output to a transmission line through the NCU. In this case, the adjustment of the level of the signal to be transmitted is carried out in accordance with a predetermined characteristic, such as frequency, of the signal to be transmitted. Also provided is a push phone having a DTMF signal generating circuit and a DTMF signal is also adjusted in level before being output to the transmission line in a manner similar to the signal from the MODEM.

REFERENCES:
patent: 3735034 (1973-05-01), Richeson, Jr.
patent: 3889057 (1975-06-01), Perreault et al.
patent: 4346410 (1982-08-01), Maeno

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