Re: dither

rtaylor wrote:
> Hi all,
> 
> What is the status of dither (if any) in ecasound?  I'm looking at 
> implementing this myself, or I could help if someone is already working 
> on this.
> 
> I've been using ecasound to build crossovers with equalization for 
> active loudspeakers, but also as a general signal-processing toolbox.  
> See e.g. here:
> 
> http://rtaylor.sites.tru.ca/2013/06/25/digital-crossovereq-with-open-source-software-howto/
> 
> Lack of dither is a problem for me, though I have a workaround that 
> pipes output from ecasound to sox for dithered re-quantization.  I have 
> a post here that shows the problems with ecasound's undithered output, 
> plus my current workaround:
 
> http://rtaylor.sites.tru.ca/2015/08/12/dither-and-ecasound/

Hi Richard,

Nice articles, both.

I didn't find any match for 'dither' in the 
Ecasound git history. Grepping through the
sources I found only this mention. If there
is not "dither" in comments anywhere. 

(edi-37): Porting Steve Harris' dither code from JACK to ecasound
         - submitted: jhall, 17.03.2003
         - migrated to sf.net -> sffeat:2134188

Looking further:

git:master ~/build/ecasound $ grep -ri dither `ls`
Binary file ecasound/ecasound matches
Binary file libecasound/plugins/.libs/audioio_sndfile.o matches
Binary file libecasound/plugins/.libs/libecasound_plugins.a matches
Binary file libecasound/plugins/audioio_sndfile.o matches
Binary file libecasound/.libs/libecasound.a matches

Does this suggest that dithering, such as ecasound has, is
from libndfile? 

From man ecasound: 

  Libsndfile - ’sndfile’
              If  libsndfile  support  was  enabled  at compile-time, this option
              allows you to force Ecasound to use libsndfile for  reading/writing
              a certain audio file. Option syntax is -i:sndfile,foobar.ext[,.for‐
              mat-ext] (same for -o).  The optional third parameter "format"  can
              be used to override the audio format (for example you can create an
              AIFF file with filename "foo.wav").

So, maybe try using

-o,sndfile,output.wav ? 

cheers, Joel

 
> Richard
> 
> 
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-- 
Joel Roth
  


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