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Old 14 January 2017, 14:27   #82
demolition
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Quote:
Originally Posted by meynaf View Post
Does not mean nothing else can creep in, like components of higher frequencies.
Sure, if the anti-aliasing filter is not good enough, then frequencies above Fs/2 will mirror down below Fs/2. This sounds horrible, particularly since they are inharmonic. When sampling @ 48 kHz 16 bit, then the anti-aliasing filter should ideally have a 0 dB gain @ 20 kHz and less than -96 dB gain @ 24 kHz. This is quite a steep roll-off but doable today if done right. Cheap A/D converters will not do it right, and then you will get a better result with 96 kHz since that will loosen up the restrictions for the filter significantly.

Just because cheap converters perform bad, doesn't mean that 48 kHz can't be good enough.

Quantization noise relates to the bit depth of the sampled signal. With 8 bit it is quite audible with most sounds, but with 16 bit you will need to turn the volume up very loud to be able to hear it, and then you will still only be able to hear it during very soft parts of the music, so effectively it is not an issue with most music. In cinemas where you have a large dynamic range, it makes sense to go above than 16 bit.
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