[pulseaudio-discuss] Resampler quality evaluation: now with room noise!

[Alexander E. Patrakov]

30.09.2014 14:21, David Henningsson wrote:

> I did a quick test here. I have an old laptop that runs Ubuntu 12.04,
> with default installed PulseAudio 1.1. Its processor is Intel Pentium M
> @ 1.4 GHz [1], single core, with an AC'97 codec.
>
> Running speaker-test will automatically cause resampling from 48 kHz
> down to 44.1 kHz, as verified with "pactl list sink-inputs".
>
> Under speex-float-1, PulseAudio consumes about 4.3% CPU. With
> speex-float-3, PA consumes ~8% CPU. With speex-float-5, PA consumes ~13%
> CPU.

OK. Given that Ubuntu provides the SSE2-optimized library for speex on 
i386, I think that our results are comparable. Could you please also 
show the actual CPU frequency, if the power-saving features of the 
platform allow the kernel to decrease it?

And I think it will also be a good idea to add Windows XP to resampler 
quality comparison, so that we have a desktop system that was commonly 
used on this kind of CPUs.

-- 
Alexander E. Patrakov