Facsimile machine transmission rate fall-back arrangement

Details Facsimile machine transmission rate fall-back arrangement Facsimile machine transmission rate fall-back arrangement

1989-12-26

1991-09-17

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Image transmission accuracy verification

358406, 358434, H04N 100

Patent

active

050500040

ABSTRACT:
A facsimile machine is provided with a fall-back strategy arranged to track not only errors occurring in received scan lines randomly disposed over a received facsimile page, but also errors occurring in each of a series of scan lines. If the level of each such error at least equals the value of a respective threshold adapted to the current transmission rate and facsimile resolution, then the transmission rate is changed, in which case, the value of each threshold is changed in accordance with a new transmission rate.

REFERENCES:
patent: 4153916 (1979-05-01), Miwa et al.
patent: 4623936 (1986-11-01), Urban et al.
IEEE Trans. on Communications, vol. COM-25, No. 10, Oct. 1977, "Facsimile Signal Decoding Which Localizes the Effect of Run--Length Code Errors", Y. Eto, et al, pp. 1170-1173.
IEEE Trans. on Communications, vol. COM-25, No. 11, Nov. 1977 "Comparison of Redundancy Reducing Codes for Facsimile Transmission of Documents", H. G. Musmann et al, pp. 1425-1433.

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