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In Reply to: RE: Isn't a small part of the "problem" that... posted by saintjean on May 19, 2025 at 06:22:17
I don't blame you to think so in 1983. Almost none of us did understand digital at that time.
Today we know the MSB is not a checksum (parity) but a sign bit. It simply tells you if the values are negative (-32768) or positive (+32767).
https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio
Edits: 05/19/25 05/19/25
Someone in different circumstances (and with a different personality) might have saved every scrap of "official" communication from the Compact Disc Group, or whatever was the name of the public-relations collaborative in NYC that was funded by the various industry participants.
I definitely remember setting aside time to read all the stuff about how wonderfully robust S/PDIF-System CDs were.
I vividly recall that the staff at DIGITAL AUDIO review decided that the WORST EVER CD TO DATE was by Zubin Mehta's son Bejun, who was a Boy Soprano.
So, they decided to sacrifice that CD to a Torture Test. Does anyone else remember that?
I thought it was gratuitously cruel.
They smeared Peanut Butter on it, etc.
About Checksum vs. +/- Sign--that bit is still not available for music data, right?
ciao,
saintjean
CD is 16 bit PCM audio.
Might it be you are mixing up CD and S/PDIF?
S/PDIF is a 32 bit word with 24 bits reserved for audio and a 8 bit preamble. One of this 8 bits is a parity bit so the receiver can check the integrity of the data.
The Well Tempered Computer
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