Talk:Electronovision
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"B&W 819 lines" is in contradiction with "SECAM"[edit]
The french black and white 819 lines standard's official designation is "System E" (CCIR). It is specified by a simple letter that is a reference to all its scanning parameters, sound/vision carrier frequency, modulation polarity, and so on. This is because it contains no reference to color in any way.
SECAM, on the other hand, is just a color coding method which is theoretically independent of the scanning format. Hence, to completely define a color national television standard, you use PAL, SECAM, or NTSC for the color coding standard, followed by a letter that provides all the other information: NTSC M, PAL I, PAL M, SECAM L'. The latter was the one used in France and specified a 625 lines/ 50 Hz field rate format (with positive modulation).
The two specifications only met briefly during SECAM development phase as it was initially targetted and tested to add color to the 819 lines standard. However, "SECAM E" never had an official existence, and actual commercial development of SECAM only occurred with 625 lines broadcasts.
You may find on the web some documentation related to old french TV sets that boast 819 lines AND SECAM. But those never did both of them at the same time! B&W 819 lines compliance was used when watching the french first channel, that remained in this format up until 1984. SECAM L' was used to handle the other (all 625 lines) channels, at least when they started color broadcasts in 1967.
As for my sources, i'll just say that i am french and old enough to have experienced this first hand (though not as an engineer at the time, granted).
Since Electronovision appears to be black and white, it would have had no use for the colors and additional complexity of SECAM, especially since introduction of color to a B&W standard meant some loss of horizontal resolution, which is dearly needed here. So i was tempted to replace "SECAM" by "System E" in the text, but since i do not have access to a detailed specification for Electronovision, i am not even sure the format was used exactly as specified in CCIR's description of "E", so i will refrain, and just delete "SECAM". — Preceding unsigned comment added by Metazoaire (talk • contribs) 23:06, 2 March 2017 (UTC)
- You are mostly right, but for one system. The designation "NTSC" not only describes the colour encoding system but also the 525-line (System M) video format as well. This is because the 525-line format was specified by the US National Television Systems Committee (NTSC) long before it reconvened to specify the colour encoding system. 86.143.86.56 (talk) 11:52, 15 December 2018 (UTC)