Quad;627464 Wrote:
> I don't get this. Sorry Phil, unlike you I'm always confusing instead of
> helping. But once started I can't stop.
>
> Here we go ;-)
>
> When I put this in my custom-convert, things are almost fine
>
> >
Code:
--------------------
> > flc pcm * *
> # IFD:{RESAMPLE=-r %d}
> [sox] -D -q -t flac $FILE$ -t raw -c2 -s $RESAMPLE$ -
--------------------
> >
>
> Everything up to 96k streams as PCM to my Touch at its original
> sample rate. On top, even 192k files seem to be treated with this
> line but they play way too slow and my DAC says it's 44.1k!
>
> When I put this, things look even better but still not optimal
>
> >
Code:
--------------------
> > flc pcm * *
> # IFD:{RESAMPLE=-r 44100}
> [sox] -D -q -t flac $FILE$ -t raw -c2 -s $RESAMPLE$ -
--------------------
> >
>
> Now all of my library is playing at the right speed regardless the
> sample rate, but obviously 192k files are downsampled to 44.1k
> instead of 96k.
>
> And yes, you are right, SoX is perfectly capable of resampling PCM.
> Outside the Squeezebox world I managed to do so.
>
> If you could explain how and why things are the way they are, I would
> be grateful.
As I said, SBS does not handle smart downsampling for WAV/PCM - hence
your first version above doesn't work for 192 (actually it won't work
for anything > 96) - you can't use the "%d" option!
So your second version is better but not great.
What I do is similar to your second version but:
1) I force EVERYTHING to 96
2) you MUST lower the volume slightly when upsampling to avoid clipping
-v0.965 works for me.
3) use the high quality resampling algorithm -v
see below: remember I am streaming FLAC as FLAC (via Inguz but that is
irrelevant)...
flc flc * *
# FT:{START=--skip=%t}U:{END=--until=%v}D:{RESAMPLE=rate -v -s 96k}
[flac] -dcs $START$ $END$ -- $FILE$ | [sox] -q -v0.965 -t wav - -t wav
-C 0 - rate -v -s -L -a 96000 | [InguzDSP] -id "00:04:20:22:01:8e" -wav
-wavo -d 24 | [flac] -cs -0 --totally-silent -
flc flc transcode * - identical to above.
The key parts are:
1) lower the volume slightly
2) use 96000 as the fixed resampling rate for everything
3) use the -v option for very high quality resampling
--
Phil Leigh
You want to see the signal path BEFORE it gets onto a CD/vinyl...it
ain't what you'd call minimal...
Touch(wired/XP) - Audiolense 3.3/2.0+INGUZ DRC - MF M1 DAC - Linn 5103
- full Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5),
Pekin Tuner, Townsend Supertweeters, Blue Jeans Belden Digital,Kimber
8TC Speaker & Chord Signature Plus Interconnect cables
Stax4070+SRM7/II phones
Kitchen Boom, Outdoors: SB Radio, Harmony One remote for everything.
------------------------------------------------------------------------
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View this thread: http://forums.slimdevices.com/showthread.php?t=86994
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