that_punk_guy wrote:
What I meant was that since the outside of the disc moves a lot faster than the inside, that physically each second of audio occupies a shorter distance on the groove. So if you played the groove linear somehow, it would steadily increase in pitch. That would account for the varying pitch where the groove isn't concentric with the centre hole.
Um, that's if I'm right. My head hurts, I'm not sure, heh. :-)
Oh, I get what you're talking about now.
Yes, record players use CAV (Constant Angular Velocity). The needle has to travel a greater distance at the edge than it does near the center, because of this the linear velocity is different depending on the location of the needle, hence the throughput is different too.
So YES, if a record is stamped off-center, it will sound all sorts of warbly-messed up because the throughput changes irregularly as the needle moves closer and farther away from the center, instead of smoothly closer the way the a properly centered record would.