Facsimile communication method with anti-echo strategy

Details Facsimile communication method with anti-echo strategy Facsimile communication method with anti-echo strategy

1982-06-29

1985-05-21

Smith, Jerry

Excavating

371 47, 358257, H04M 136

Patent

active

045190810

ABSTRACT:
In a facsimile communication method capable of preventing receipt of an echo of data being transmitted, a preamble-preceded frame is used as a data to be transmitted, and the frame is allowed to be received only when its preceding preamble has been received. For this purpose, the total time length of the preamble-preceded frame being transmitted is monitored. If it is shorter than a predetermined time length, a number of flags as required are added to the end of preamble-preceded frame, thereby ensuring that the total time length of transmitting the data is always longer than the predetermined time length. In this manner, it is ensured that an echo of data being transmitted returns only while transmission of the data is in progress and is thus not received.

REFERENCES:
patent: 3441665 (1969-04-01), Wuensch
patent: 3914537 (1975-10-01), Perreault et al.
patent: 4000371 (1976-12-01), Ogawa
patent: 4296439 (1981-10-01), Teramura et al.
patent: 4296440 (1981-10-01), Rosenheck

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