44/48 kHz, USB Audio and Helix

[Rom MUSIC BAR]

Nice :) thx! 
Romain 




On 13 Sep 2017, at 02:14, Tony Hardie-Bick <tony at entity.net> wrote:

> I can jump in briefly... directly audible material can be fully
> reconstructed from 48KHz 16bit samples. However, if you then post
> process those samples, for example with EQ, the dither that was used to
> avoid quantisation distortion will become louder in the boosted part of
> the spectrum. So, it's almost like analogue, in that the noise floor is
> audible. This is assuming the code was written well. If not, you'll hear
> quantisation noise. Which has an aesthetic. But you want a choice on
> that aesthetic. So you go for at least 24bits, to keep any such noise or
> distortion much quieter.
> 
> As regards the sample rate, even 44.1kHz will reconstruct what you can
> directly hear, but any effects that are then applied, such as EQ, or
> anything subtle, will be compromised (-6dB per octave not necessarily
> being -6dB per octave, for example) by the low sample rate. So, several
> kinds of effects will benefit from a higher sample rate, and, to avoid
> the high computational cost of sample rate conversion in and out of each
> effect, you just run the everything at a higher rate. Preferably 96kHz
> or more. Basically, everything gets easier to do well, the higher the
> sample rate, even if, in theory, there is basic stuff, like simply
> mixing channels together, where it makes absolutely no difference at all.
> 
> HTH,
> 
> t.

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