3 ms·
> All audio signal is _perfectly_ represented in a digital form. That is not true... A 22kHz signal only has 2 data points for a sinusoidal waveform. Those 2 p
by hdjxbsksbsh 9mo ago
> All audio signal is _perfectly_ represented in a digital form.
That is not true... A 22kHz signal only has 2 data points for a sinusoidal waveform. Those 2 points could be anywhere I.e you could read 0 both times the waveform is sampled.... See Nyquist theorem.
From memory changing the sample rate can cause other issues with sample aliasing sue to the algorithms used...
- temp8830 9mo agoWell, yeah, because that's the Nyquist limit at that sample rate. The max frequency needs to be below that (22.999kHz would not be undersampled). Of course, all of these frequencies are in the ultrasound range anyway. Reducing the sample rate could cause aliasing. Oversampling shouldn't.
- klaff 9mo ago22 kHz is not a hard/fast limit. There are people who can hear a bit above 20 kHz. I learned this when working with motor drives (at 23 kHz) but also documented in this wiki reference. https://en.wikipedia.org/wiki/Hearing_range#cite_note-10 https://en.wikipedia.org/wiki/Hearing_range#cite_note-10