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<blockquote data-quote="homercartman" data-source="post: 1078261" data-attributes="member: 414304"><p>Some observations regarding _block_sequence[] in the context of using PIC card, and looking at VBI line where vbi[4]==0x15 (ie hamming line 0):</p><ul> <li data-xf-list-type="ul">vbi[6] = 0x00, or 0xFF or 0xAA... : decoder still locks and descrambles correctly. what could be the use of vbi[6] then?</li> <li data-xf-list-type="ul">vbi[7] &= 0x01: still works.</li> <li data-xf-list-type="ul">vbi[7] = 0: decoder still locks but does not descramble picture anymore.</li> <li data-xf-list-type="ul">vbi[7]= 1: same as = 0</li> <li data-xf-list-type="ul">long term effects are uncertain, decoder infrequently looses lock for a couple of seconds, and comes back for several minutes. I'm not sure this is actually related to experiments on block_sequence[] .</li> </ul><p>So far, it looks like:</p><ul> <li data-xf-list-type="ul">setting vbi[6] to whatever value has no negative effect on locking nor descrambling (with PIC card)</li> <li data-xf-list-type="ul">vbi[7] bit 0 <strong>alone</strong> has a critical impact on actual descrambling: line descramble strobe? seed init / prng reset phase? ( change in permutation table selection? I doubt it, as mode == 0x73 already somehow changes something similar, see my posts above)</li> <li data-xf-list-type="ul">basically, to decode reliably, it is sufficient that vbi[7] ==0 when s->_block_seq is among 18, 58, 98 and so on..., else ==1. see below [CODE]<br /> seq 0 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 2 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 4 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 6 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 8 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 10 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 12 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 14 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 16 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 18 seq2 0 vbi6&7 00 00<br /> ->VBI: 00 00 00 6C 15 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4F 2A<br /> --<br /> seq 20 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 22 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 24 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 26 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 28 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 30 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 32 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 34 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 36 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 38 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 40 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 42 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 44 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 46 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 48 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 50 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 52 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 54 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 56 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> seq 58 seq2 0 vbi6&7 00 00<br /> ->VBI: 00 00 00 6C 15 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4F 2A<br /> --<br /> seq 60 seq2 0 vbi6&7 00 01<br /> ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45<br /> --<br /> [/CODE]</li> </ul></blockquote><p></p>
[QUOTE="homercartman, post: 1078261, member: 414304"] Some observations regarding _block_sequence[] in the context of using PIC card, and looking at VBI line where vbi[4]==0x15 (ie hamming line 0): [LIST] [*]vbi[6] = 0x00, or 0xFF or 0xAA... : decoder still locks and descrambles correctly. what could be the use of vbi[6] then? [*]vbi[7] &= 0x01: still works. [*]vbi[7] = 0: decoder still locks but does not descramble picture anymore. [*]vbi[7]= 1: same as = 0 [*]long term effects are uncertain, decoder infrequently looses lock for a couple of seconds, and comes back for several minutes. I'm not sure this is actually related to experiments on block_sequence[] . [/LIST] So far, it looks like: [LIST] [*]setting vbi[6] to whatever value has no negative effect on locking nor descrambling (with PIC card) [*]vbi[7] bit 0 [B]alone[/B] has a critical impact on actual descrambling: line descramble strobe? seed init / prng reset phase? ( change in permutation table selection? I doubt it, as mode == 0x73 already somehow changes something similar, see my posts above) [*]basically, to decode reliably, it is sufficient that vbi[7] ==0 when s->_block_seq is among 18, 58, 98 and so on..., else ==1. see below [CODE] seq 0 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 2 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 4 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 6 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 8 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 10 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 12 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 14 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 16 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 18 seq2 0 vbi6&7 00 00 ->VBI: 00 00 00 6C 15 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4F 2A -- seq 20 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 22 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 24 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 26 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 28 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 30 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 32 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 34 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 36 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 38 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 40 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 42 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 44 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 46 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 48 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 50 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 52 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 54 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 56 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- seq 58 seq2 0 vbi6&7 00 00 ->VBI: 00 00 00 6C 15 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4F 2A -- seq 60 seq2 0 vbi6&7 00 01 ->VBI: 00 00 00 6C 15 72 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B 45 -- [/CODE] [/LIST] [/QUOTE]
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