Re: Audio recording bitdepth
Re: Audio recording bitdepth
- Subject: Re: Audio recording bitdepth
- From: Paul Davis <email@hidden>
- Date: Wed, 9 Dec 2009 14:24:07 -0500
On Wed, Dec 9, 2009 at 2:07 PM, Bjorn Roche <email@hidden> wrote:
> At the risk of starting a flame war, here is my follow-up:
>
> http://blog.bjornroche.com/2009/12/linearity-and-dynamic-range-in-int.html
although i appreciate the focus of the two posts is on audio quality
(as it should be), it would be instructive to follow up with a measure
of the cache cost of using a conditional to determine negativity in
the asymmetric method. cachegrind should do this relatively easily. we
ran some small not very representative tests when revisiting the JACK
ALSA backend conversion code and concluded that cost in branch-induced
cache misses was larger than we were willing to pay in exchange for
the extra sample value. although there are many cases where the user
may wish to put fidelity over cpu cost, at least being able to
estimate the likely cost (say, per channel of N bit samples at a given
SR) would aid people in making this choice wisely.
--p
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