Howtosignalprocessing
- Does downsampling reduce audio quality?
- How does downsampling cause aliasing?
- Which performs better downsampling upsampling or leaving the data Raw?
Does downsampling reduce audio quality?
Yes, but don't worry about it too much. Some of the best sounding drums ever come out of 12 bit samplers, perfection is not necessary IMO. My sampler samples at 20,500 hz yet still sounds good. By definition it's a reduction of quality.
How does downsampling cause aliasing?
If a discrete-time signal's baseband spectral support is not limited to an interval of width 2 π / M radians, downsampling by M results in aliasing. Aliasing is the distortion that occurs when overlapping copies of the signal's spectrum are added together.
Which performs better downsampling upsampling or leaving the data Raw?
It depends on the level of certainty you need. If you don't need mathematical certainty and just want a heuristic, downsampling is faster and upsampling is more accurate. If you need to put bounds on the accuracy of your computation: it is possible but I can't help you with that.
