[LAD] [LAU] best 96/24 to 44.1/16 to 96/24 convertion chain

[Andrew Gaydenko]

On Saturday, May 08, 2010 16:06:43 fons at kokkinizita.net wrote:
> > As for sample rate changing - do I understand well, Fons' intention is to
> > use resampling in real time processing? If it so - will it be comparable
> > in quality with SRC offline "Best Sinc" processing? I mean, real-timing
> > can forces some compromises in quality (with all my respect to and
> > admire of multiple Fons' tools which I use widely!).
> 
> Zita-resampler uses the same 'sinc' algo as SRC, and the resample
> application configures for the best quality which corresponds to
> a 192 tap FIR. The differences are
> 
> * zita-resampler precomputes all filter coefficients and does not
>   have to interpolate them while processing. This makes it faster,
>   in particular for multichannel since (at least the last time I
>   looked) SRC repeats this interpolation for each channel.
> 
> * The SRC filter goes for full attenuation at FS/2 (FS is the lower
>   of the two sample rates) while zita-resampler has -60dB at that
>   point. This is a deliberate choice. Zita-resampler will reach
>   full attenuation of aliases at all frequencies where it matters,
>   at least when used at the normal sample rates (>= 44100). It
>   should not be used to resample to e.g. 32 kHz or lower.
> 
> Listening tests with 'expert' users have shown that none of them
> have been able to hear the difference between the original, SRC,
> and zita-resampler even at a *lower* quality setting.

Fons, thanks for the clarification!

BTW, do you know some public hrefs to results of such or related kinds of 
tests (I mean those which you can treat as more or less objective)? I'm 
interested in psychoacoustic in a whole, but don't know whom to believe to in 
this almost sold world :-)

P.S. You have  moved the thread from LAU to LAD - so I'm follow
     your decision.


Andrew