[pulseaudio-discuss] Resampler quality evaluation results

[Alexander E. Patrakov]

16.09.2014 17:36, Laurențiu Nicola wrote:
> Thanks a lot. For the record, it seems that:
>
>      1. Resampling from closer rates yields less distortion that from
>      rates that are far apart.
>      2. Upsampling distorts more than downsampling.
>      3. speex-float-3 gives audible distortion even for close rates.
>
> I suppose I these results were to be expected, but it's still nice to
> have confirmation.
>
> Now if I only could check the performance of speex-fixed vs. speex-float
> on my platform.. :).

Well, yes, but please bear in mind that all of those audibility results 
are based on three unrealistic assumptions:

1. Unbearably loud sounds.
2. Absolutely quiet room.
3. Sine waves (that nobody listens to).

I.e. they are the worst case in many aspects.

I keep promising myself to start working on (3), and I got some 
high-quality recordings of typical room noise for (2). But for several 
days, when I come from work, I start wasting time by watching videos or 
chatting instead of working on these problems. Sorry for that.

-- 
Alexander E. Patrakov