Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1978-07-12
1980-09-30
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358260, H04N 117, H04N 712
Patent
active
042258880
ABSTRACT:
The present facsimile transmission system is a combination of the prior Skipping White Space (SWS) system which is a digital system capable of rapid transmission, and the prior AM-PM-VSB (Amplitude Modulation, Phase Modulation, Vestigial Side Band Modulation), which is a simple analog system. Each scanning line of a picture is divided into a plurality of blocks each of which has a plurality of picture cells, and only those blocks having a black cell are transmitted as a picture signal. On the other hand the block having no black cell is not transmitted, and instead, the flag information indicating that the block is omitted is transmitted. Also a line synchronization signal is transmitted for each scanning line. When said signals (picture signals, flag information and a line synchronization signal) are modulated into an AM-PM-VSB signal, a picture signal is modulated as an ordinary analog signal, and a flag information and a line synchronization signal has the twice level as high as the highest level of the picture information, and have the duration longer than that of each picture cell. Thus, although a simple analog AM-PM-VSB system is utilized, the important information like a line synchronization signal and a flag information which affect much to the received picture quality are transmitted with a small error rate and a high reliability.
REFERENCES:
patent: 2922840 (1960-01-01), Lally
patent: 4044382 (1977-08-01), Yagishita
patent: 4047228 (1977-09-01), Yagishita et al.
Katsuno Takeharu
Nakagata Norio
Takayama Shoichiro
Griffin Robert L.
OKI Electric Industry Co., Ltd.
Orsino Jr. Joseph A.
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