Facsimile machine having a transmission speed selective shiftdow

Details Facsimile machine having a transmission speed selective shiftdow Facsimile machine having a transmission speed selective shiftdow

1988-10-05

1992-10-27

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Image transmission accuracy verification

358434, 358435, H04N 100

Patent

active

051594650

ABSTRACT:
A facsimile machine includes a data transmission speed shift down function according to which the data transmission speed is shifted down from its initial speed to one of a plurality of new speeds based on a ratio between the total number of data frames initially transmitted to a receiver and the number of data frames requested for retransmission by the receiver. In this manner, an optimal new data transmission speed may be accurately and expeditiously determined. A parameter memory containing information regarding destination areas to which an error correction mode of operation is to be used may be preferably provided in a facsimile machine having both of an error correction mode (ECM) and a normal mode. With this structure, the ECM mode can be automatically set. In such a facsimile machine having both an ECM and a normal transmission modes, a common buffer memory is provided for temporarily storing coded image information either in the ECM or normal transmission mode.

REFERENCES:
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patent: 4583124 (1986-04-01), Tsuji et al.
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patent: 4680773 (1987-07-01), Amundson
patent: 4710925 (1987-12-01), Negi
patent: 4720829 (1988-01-01), Fukasawa et al.
patent: 4779274 (1988-10-01), Takahashi et al.

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