Image communication system, and image communication apparatus an

Details Image communication system, and image communication apparatus an Image communication system, and image communication apparatus an

1992-12-21

1994-09-27

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358412, 358405, 358407, 379100, 379 88, 379 67, 370 32, H04N 100

Patent

active

053511344

ABSTRACT:
In an image communication system capable of performing communication at a plurality of transmission speeds, a transmission-side apparatus transmits a line condition check signal (a TCF signal of the CCITT facsimile recommendation T30, or the like) for determining a transmission speed prior to communication of image data. A reception-side apparatus determines an optimal transmission speed on the basis of a reception state of the line condition check signal (a square error accumulation value, an error count result, or the like in an equalizer of a reception-side modem), and informs the determined transmission speed or a fall-up or fall-down instruction of a transmission speed to a necessary step to the transmission-side apparatus. The optimal transmission speed according to a line condition can be set within a very short period of time.

REFERENCES:
patent: 4630126 (1986-12-01), Kaku et al.
patent: 5057938 (1991-10-01), Edamura
patent: 5077742 (1991-12-01), Tsumura et al.
patent: 5153527 (1992-10-01), Yaguchi
patent: 5159465 (1992-10-01), Maemura et al.
patent: 5172246 (1992-12-01), Yoshida
patent: 5285441 (1994-02-01), Bansal et al.
ICC 1980 Seattle, Wash.; A One-Chip Modem LSI for Facsimile Modem Use; pp. 11.6.(1-5); IEEE Journal.

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