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Analogue Nagravision (Syster) encoder
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<blockquote data-quote="weakbit" data-source="post: 1105589" data-attributes="member: 416387"><p>[USER=243342]@Captain Jack[/USER] - but about the 31lines is also some thing to tell. This 31 lines each half picture are the top part and in the transmission are this 31 lines on the bottom side of the picture? why? The answer is simple V-RAM was in the early days of Videomemory expensive so they come to the idea to split the picture in 10parts each 31line - 625 line a fullframe, the vertical signal is 15*32µs. A half frame is 312,5lines - 1st half picture line1,3,5... 2nd half picture line 2,4,6... and so on. First the V-RAM are store the scrambled lines on the bottom sideof the picture. After storage the scrambled lines in the V-RAM(Video lines are scrambled write to V-RAM) then the vertical impulse occur. A new half picture is begin. The first line will be read out of the V-RAM (descrambled Video) and will sort in correct position to the 1st line, 3rd line, 5th line... and so on. During this time the 2nd V-RAM(Video lines are scrambled write to 2nd V-RAM) will be written with the scrambled Videolines. After this time the 2nd V-RAM will read out and sort the scrambled lines in correct order by line32.... and so on.</p><p>The V-RAM was so expensive and the slit the half screen into line blocks of 10times with 31lines. Only the line is changed not the Black should where is the Burst with 4,43361875MHz PAL625. So long weakbit</p></blockquote><p></p>
[QUOTE="weakbit, post: 1105589, member: 416387"] [USER=243342]@Captain Jack[/USER] - but about the 31lines is also some thing to tell. This 31 lines each half picture are the top part and in the transmission are this 31 lines on the bottom side of the picture? why? The answer is simple V-RAM was in the early days of Videomemory expensive so they come to the idea to split the picture in 10parts each 31line - 625 line a fullframe, the vertical signal is 15*32µs. A half frame is 312,5lines - 1st half picture line1,3,5... 2nd half picture line 2,4,6... and so on. First the V-RAM are store the scrambled lines on the bottom sideof the picture. After storage the scrambled lines in the V-RAM(Video lines are scrambled write to V-RAM) then the vertical impulse occur. A new half picture is begin. The first line will be read out of the V-RAM (descrambled Video) and will sort in correct position to the 1st line, 3rd line, 5th line... and so on. During this time the 2nd V-RAM(Video lines are scrambled write to 2nd V-RAM) will be written with the scrambled Videolines. After this time the 2nd V-RAM will read out and sort the scrambled lines in correct order by line32.... and so on. The V-RAM was so expensive and the slit the half screen into line blocks of 10times with 31lines. Only the line is changed not the Black should where is the Burst with 4,43361875MHz PAL625. So long weakbit [/QUOTE]
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