Data transmission system

Details Data transmission system Data transmission system

H - Electricity

04

N

340/101, 350/34

H04N 7/08 (2006.01) H04J 3/24 (2006.01) H04N 7/025 (2006.01) H04N 7/088 (2006.01) H04N 7/16 (2006.01)

Patent

CA 1198791

ABSTRACT OF THE DISCLOSURE The one-way data transmission system is similar to a teletext system of the type described in the U.S. patents 4,058,830, 4,317,132 and Canadian patent application Serial No. 361,052 filed September 25th, 1980 by Yves, Maurice Noirel, but, in addition, it makes it possible to transmit data having such structures that error correction and ciphering are possible. For transmitting those data, the length of the packet is always the maximum length and the value of the format byte is nil. In the described embodiment, there is provided a wire (269) from every channel to its associated coupler (267). That wire (269) may be at levels "1" or "0". The coupler comprises first switching means (268, 270, 273, 275, 277 and 278) for switching out counter (87) and memory (170). It includes a memory (281) storing a format byte the value of which is nil and second switching means (271, 276 and 279) to connect memory (281) to data memory (72) at any packet transmission, when wire (269) is at level "1". The reception equipment is modified accordingly.

402718

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