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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Any Pioneer PDR-* users out there? posted by theguelpher on September 2, 2017 at 10:40:44:
According to the Pioneer service manual, the "skpped ID" tracks use a different part of the ToC to figure out where each track starts and ends:
"When the INPUT selector is set to ANALOG, you can change the
time display with tracking on by pressing the SKIP ON/OFF key.
SKIP OFF (SKIP segments lit) : Absolute time (ATIME)
SKIP ON (SKIP segments unlit) : Sub Q TIME"
You have to remember that when CD was introduced that the only affordable microprocessors were 4-bit designs. Not a lot of computing power there! So they had to make everything super-duper simple. Normally the ToC has the things like the track number, the absolute time (relative to the start of the disc) and so forth.
Later players had *much* more powerful processors that could do a lot more tricks. One of the things was sub-codes, which had been there all the time (P, Q, R, S, and T, I believe) but couldn't be read in real time fast enough to be useful with an early 4-bit processor.
It looks like the "skipped ID" functioned by having the laser look for the time code buried in the Q-sub-code, and this is what must have been modified when burning a disc with "skipped ID" tracks. There probably isn't any other player in the world that would know where to look for the track times of the "skipped ID" tracks, hence this feature would only work on a disc that was both recorded and played back on a Pioneer PDR-x player.
Hope that helps,
Charles Hansen
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- Found it - Charles Hansen 09/6/1717:25:13 09/6/17 (0)
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