|MadSci Network: Computer Science|
Hi, The playback speed of a CD is determined solely by a clock oscillator which times the outgoing samples at 44100 samples per second. The CD mechanism will speed up or slow down in order to maintain this data speed. So, CD rotation follows output data rate, not the other way round. The precision of the clock oscillator should be correct within 400 parts per million for consumer grade equipment and 50 parts per million for professional equipment. However, some consumer devices have been marketed that saved a penny by substituting a "ceramic resonator" for the quartz crystal normally used, resulting in playback speed errors of up to a percent. Kind regards Bruno
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