3 ms·
The parent didn't claim 50ppm clock inaccuracy but I think their claim is very credible. For example, the uC I am working on right now has built-in DACs which
by esmi 8y ago
The parent didn't claim 50ppm clock inaccuracy but I think their claim is very credible.
For example, the uC I am working on right now has built-in DACs which are good enough for audio and a 5% accurate internal clock (uncalibrated). If a vendor cheaped out and didn't use a proper external oscillator and/or didn't calibrate the clock (which is presumably the code the parent wrote) then the frequency would be basically one half step off on an equal tempered scale which is definitely audible for most people.
http://pages.mtu.edu/~suits/NoteFreqCalcs.html http://pages.mtu.edu/~suits/NoteFreqCalcs.html
- newqer 8y agoYou're correct! When sound is recorded, it will be transformed from analog to digital. This will be done with a very high quality clock source. At home when you play your music it's often on a DAC with a bad clock source. You can hear this easily because the timing of the samples is off. The reconstructed waveform is different because of the wonky timing (jitter). Replacing the clock source (soldering) within a cheap CD player with a high quality one, will make it sound a much better. http://www.tentlabs.com/Components/cdupgrade/xo2xo3/index.html http://www.tentlabs.com/Components/cdupgrade/xo2xo3/index.ht...
- rasz 8y agoAudiophoolery, this website also sells 200 euro volume knob, says it all. Nonetheless I will elaborate, 100ps jitter you are being warned about in the description of this must have clock module will be detectable to any human with hearing reaching 10 GHz range. I recommend https://xiph.org/video/ https://xiph.org/video/
- rasz 8y agoExcept no one uses basic RC oscillators in Audio gear, and the cheapest bottom of the barrel crystal has already mentioned 50 ppm accuracy and excellent stability.