question about digital playback speed?
barondla -- Tue, 02/17/2009 - 09:24
On a portable MP3 player forum people have been discussing how some players can be measured to run fast or slow. They were helping people measure player by recording a 1khz signal and up loading to a website. Some were running 0.7% fast while others were running 0.3% slow (same brand ,different model players). This amazes me. Figured the one thing digital would do absolutely right is playback speed. Know there are some pro cd palyers with pitch control, but thought they were having to do all kinds of digital trickery to run off speed. Maybe not. How can different players be off this much? Do home Cd players also do this?
thanks
barondla
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The playback "speed" is a function of the word-clock frequency, which will vary with the oscillator generating the clock. Crystal oscillators will also change their frequency as a function of temperature.