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June 1, 2005
Trivia: What's up with 007 coding for CD speed?
A recent discussion on the AUTOCAT list addressed the reason why the speed of an audio compact disc is 1.4 meters per second (007/03 f). Just in case you're curious, here's a good explanation of why this is the case:
"CDs and DVDs address this by using what is called Constant Linear Velocity (CLV) The surface moves past the read head at a constant rate. This means as the pickup head moves from the center toward the edge of the disc, the disc does not have to turn as fast since there is more ground to cover. It is akin to the old "whirly go round" at the park. The kid on the outside had to run fast, but the kid in the center barely had to move. The rate chosen was 1.4 meters per second. As the disc plays, there is more "landscape" to record on so the disc doesn't need to move as fast."
Posted by trail001 at June 1, 2005 10:30 AM | Audio
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