Re: [LAU] questions about resampling

On Sat, 22 Nov 2014, Fons Adriaensen wrote:

> On Fri, Nov 21, 2014 at 08:11:29PM -0800, Len Ovens wrote:
>
>> So I was asking if the audio phase/sync would be preserved if a
>> stereo pair was split across two devices, one out of sync with the
>> other and resampling being used to sync the two together. It appears
>> from your other answers, that there may be noticable artifacts.
>
> It all depends on how big the errors are. The test results at the
> end of my LAC 2012 paper provide some indication of this. From these,
> if you compensate for the static delay difference, the remaining
> variations are a few microseconds. Four usecs at 20 kHz means
> around 30 degrees in phase, leading to the 0.3 dB loss in a mono
> mix mentioned before. I don't think anyone will notice.

No I don't think anyone would notice that. I was thinking more about the
stereo imaging. I know at some frequencies the brain senses direction of
the sound by the phase difference from one ear to the other. The last time
I did speaker listening tests (10 years ago?), I found very few that gave
good imaging anyway (and they were not the most pricy either). Maybe
things have gotten better. Maybe usecs of difference from one ear to the
other are not noticable too.

--
Len Ovens
www.ovenwerks.net
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