Facsimile and static presentation processing – Facsimile – Facsimile system interface
Reexamination Certificate
1997-06-25
2004-01-06
Wallerson, Mark (Department: 2626)
Facsimile and static presentation processing
Facsimile
Facsimile system interface
C358S406000, C358S468000, C379S100010
Reexamination Certificate
active
06674550
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a facsimile apparatus to which a plurality of types of communication lines are connectable.
2. Related Background Art
There has been a facsimile apparatus to which a plurality of types of lines are connectable.
Since a conventional facsimile apparatus of this type requires detectors identical in number to the lines to be connected, its size and cost increase.
Also, in the conventional facsimile apparatus, even when a line is selectively used, a data transmission rate at a start of communication is set to the maximum, so that even for a line under poor communication condition, it is tried to conduct communication at the maximum rate and fall-back is repeated, whereby it takes much time to determine a transmission rate.
Further, in the conventional facsimile apparatus, since only the lines in which a change in signal level is small are used, an equalizer of a modem is always set to an automatic adjustment mode even when any line is selected. So, when a line in which a change in signal level is great is used, the equalizer cannot comply to the change in signal level and a communication error occurs accordingly.
SUMMARY OF THE INVENTION
An object of the present invention is to improve a facsimile apparatus.
Another object of the present invention is to simplify a structure for detecting a type of a line connected to a facsimile apparatus to which a plurality of types of lines are connectable.
A still another object of the present invention is to provide a facsimile apparatus to which a plurality of types of lines are connectable and in which a communication rate can be determined according to a type of the line connected thereto.
A still another object of the present invention is to provide a facsimile apparatus to which a plurality of types of lines are connectable and in which no error occurs in an equalizer of a modem.
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Robert Cower, Mastering Windows 3.1 Special Edition, Sybex Inc., Chapter 10 p. 325, 1992.
Ezumi Yosuke
Kenmochi Toshio
Toyoda Hisashi
Tsukamoto Takeshi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Wallerson Mark
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