44/48 kHz, USB Audio and Helix

[Mikael Hansson]

Thanks Tony!

So, basically I should aim for 88.2 or 96...but that incurs another problem, my Adat expansion gets limited to 4 channels instead of 8 :-/

Sent from Mikaels cellular device

> 13 sep. 2017 kl. 02:14 skrev Tony Hardie-Bick <tony at entity.net>:
> 
>> On 13/09/17 00:37, deeplfo wrote:
>> The sampling frequency value represents how many audio data points you measure in a given time period, thus defining your audio quality.  It's the bit depth that represents the dynamic range of each of those data points, i.e. the headroom. So, for more detailed (accurate) representation of the audio, you would record at say 24 bits or more.  
>> 
>> You probably get some what of an improvement in audio quality by bumping the sampling rate to higher than 44.1 K values, but I'll stop here when it comes to discussing the mertis of higher sampling rate and perceived audio qualities :-)
> 
> 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.
> _______________________________________________
> music-bar mailing list
> music-bar at lists.music-bar.org
> http://lists.music-bar.org/cgi-bin/mailman/listinfo/music-bar
> 
> Listen to Music-Bar Radio! <http://stream.music-bar.org:8000/radio.m3u>