Thanks Phil, nice one.
very clear explaination, you done this before? ;)
Phil Leigh;584445 Wrote:
> Gaz,
>
> The Touch CAN output 88.2 in the following circumstances:
> 1) you are playing a 176.4 file - it will be downsampled by SOX to 88.2
> assuming you haven't fiddled with the FLAC Transcode entry in
> convert.conf
> 2) You have set convert.conf to force EVERYTHING to 88.2
> 3) You are playing an 88.2 file and have not altered your convert.conf
> settings
>
>
> Upsampling on the Touch is a waste of time with MOST Dacs IME. Many
> recent dacs upsample internally anyway via ASRC these days - even if
> you feed them high sample rates... There are only a handful of DACs
> that would theoretically benefit - ones with no internal upsampling.
>
> The way that the SBS code works is that it gives you two "choices":
> 1) the basic convert.conf entry which is the FLC FLC * entry. This does
> nothing to any files that are 96k or less for the Touch.
> I HAVE AMANDED MY CUSTOM-CONVERT.CONF AND DELETED THE TRANSCODE ENTRY
> AND HAVE AMENDED THE FLAC FLAC ENTRY TO :
> FLC FLC * *
> # FT:{START=--SKIP=%T}U:{END=--UNTIL=%V}
> [FLAC] -DC --TOTALLY-SILENT $START$ $END$ -- $FILE$ | [SOX] -V0.9 -D
> -Q -T WAV - -T FLAC -C0 -B24 - RATE -V -S -M -A 96000
>
> WOULD I BE RIGHT THEN IN THINKING THAT ALL FLACS ARE BEING UPSAMPLED TO
> 96K NOW?
>
> 2) the FLC FLC Transcode entry - this uses SOX to downsample 192 to 96
> and 176.4 to 88.2
>
> Beyond those default settings, all you can do is force one or both of
> these choices to a fixed rate (e.g. in your case 88.2).
> I'VE AMENDED THIS NOW TO 96K. I THINK I READ INTERNET FORUMS TOO MUCH
> AND ENJOY THE PLACEBO EFFECT. NO DIFFERENCE WITH 88.2 AND 96 WORTH
> BOTHERING ABOUT ON RE-EXAMINATION. :)
>
> What you can't do without real code changes to the server software is
> to be selective - you can't say (for example) "On a Touch, leave 88.2
> and 96 files alone but upsample 44.1 or 48 to 88.2"
> GOTCHA - CHEERS
>
>
> At the moment you are forcing 96k to 88.2. I really REALLY wouldn't do
> this. You are losing information for no good reason. There is no DAC on
> the market (that I know of) that can do 88.2 but not 96...
> MY DAC DOPES 96K - I'LL LEAVE WELL ALONE
>
>
> If you really feel that 44.1 upsampled to 88.2 is a clear audible
> improvement, I would take a long hard look at your DAC choice.
> TAKE YOUR POINT - PLACEBO EFFECT METHINKS...
>
> THANKS PHIL, MUCH OBLIGED.
> TEH BEE INN MY BONNET HAS BEEN TAKEN CARE OF!
>
> REGARDS
> GARY.
>
--
Gazjam
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