What are CAV, CLV, PCAV, and ZCLV?
A player spinning a CD at 1x reads 75 sectors per second. On a CD-ROM, where a sector has 2048 bytes, this is exactly 150KB/sec. On an audio CD, with 2352 bytes per sector, this works out to about 172.27KB/sec. (Note for the nit-pickers: the actual bit rate is considerably higher, because of EFM, CIRC, L2 ECC, and other magic acronyms. The channel bit rate is 4.3218MHz. See Ken Pohlmann’s _Principles of Digital Audio_, 4th edition, page 249.) In terms of revolutions per minute, the answer varies depending on which part of the CD is being read. At 1x, the speed at which bits flow under the read head (the “linear velocity”) needs to be fairly constant. You can get more bits in a circle at the outside of the disc than you can in a circle at the inside of the disc, because the circumference is greater. This means that the disc needs to spin more slowly (reduced “angular velocity”) at the outside than it does at the inside. To play an audio CD, you always want to be reading at 1x.
A player spinning a CD at 1x reads 75 sectors per second. On a CD-ROM, where a sector has 2048 bytes, this is exactly 150KB/sec. On an audio CD, with 2352 bytes per sector, this works out to about 172.27KB/sec. (Note for the nit-pickers: the actual bit rate is considerably higher, because of EFM, CIRC, L2 ECC, and other magic acronyms. The channel bit rate is 4.3218MHz. See Ken Pohlmann’s _Principles of Digital Audio_, 4th edition, page 249.) In terms of revolutions per minute, the answer varies depending on which part of the CD is being read. At 1x, the speed at which bits flow under the read head (the “linear velocity”) needs to be fairly constant. You can get more bits in a circle at the outside of the disc than you can in a circle at the inside of the disc, because the circumference is greater. This means that the disc needs to spin more slowly (reduced “angular velocity”) at the outside than it does at the inside. To play an audio CD, you always want to be reading at 1x.
