Facsimile compression system

Details Facsimile compression system Facsimile compression system

1977-10-25

1980-01-29

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, H04N 712

Patent

active

041864158

ABSTRACT:
A facsimile signal is compressed by skipping the continuous white cells longer than a predetermined length, and the compressed facsimile signal is transmitted in an analog form. When some portion of a facsimile signal is deleted due to the absence of a black cell in said portion, an f-signal indicating the deletion of said portion is inserted at the head of the deleted portion. The amplitude of the f-signal is twice as high as the highest level of a picture signal thus a reception station can differentiate the f-signal from a picture signal. The compressed facsimile signal is modulated to an AM.PM.VSB signal (Amplitude Modulation-Phase Modulation-Vestigial Side Band Modulation), and is transmitted to a communication line. When the reception station recognizes said f-signal, a predetermined number of white cells are inserted automatically on a printing paper at the reception station.

REFERENCES:
patent: 4047228 (1977-09-01), Yagishita
patent: 4056828 (1977-11-01), Furuta
patent: 4057834 (1977-11-01), Nakagome

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