I don't follow you. If you open a soundfile with diskin or diskin2, whatever
encoding it is, and then run csound as normal, you will get a perfect
16bit file

Victor

----- Original Message ----- 
From: "mark jamerson" 
To: "Csound" 
Sent: Wednesday, December 10, 2008 4:56 PM
Subject: [Csnd] 24bit->16bit conversion in Csound


>
> Hello,
>
>     During an effort to look into the effects of dither, I was trying to 
> convert 24bit files into 16bit files.  The file used was a mono 1k sine 
> tone generated in Csound, using GEN10, with table size 65536, and an oscil 
> amplitude of 10000.  This file sounded and looked perfect.  Then I tried 
> converting the file to a 16bit file in Csound.  I tried loscil and fout to 
> write a 16bit file.  The result was unacceptable, with what sounded like 
> FM sideband modulation. The spectrum analysis also looked extremely messy, 
> with a bunch of extra noise all over the place.  Next I tried using diskin 
> followed by soundin, figuring it might be a problem with my loscil setup. 
> The same results, exactly.  I know that converting a 24bit file to a 16bit 
> file without using dither will lead to a degradation in sound quality, but 
> this seemed excessive.  In an attempt to verify my concerns, I tried the 
> same sort of experiment in a consumer DAW software, by rendering the same 
> 24bit
> file as a 16bit file, with no dither, and got a much cleaner result.  The 
> new file sounded indiscernable form the 24bit source, but the spectrum 
> analysis confirmed a difference, with extra noise across the spectrum, but 
> not anywhere near the levels of the Csound version.
>    So here's my question:  Does anyone do this sort of conversion in 
> Csound, and get acceptable results, if so what methods do you use?  Also, 
> something I just thought of is that I am using the Float version of 
> Csound, is this possibly the cause of these results (would the double 
> version eliminate this sort of thing)?
>
> 
> Mark
>
>
>
>
>
>
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