Re: find clicks

Erich Eckner <[email protected]> Fri, 9 Dec 2016 12:31:39 +0100
Newsgroups	gmane.comp.audio.sox
Message-ID	<[email protected]>
Hi P,

thanks for your reply.

*ouch* I totally forgot about audacity - I regularly use this to "look
at" the audio (while I process it with sox) ...
A first trial of audacities "Click removal" removes most of the clicks,
however, it also alters all audio where no clicks have been - this seems
to be intrinsic to an analogue-click removal tool.

declick only seems to work with "digital" clicks, e.g. single samples
being wrong (according to its website) - wheras I have ~50 samples
forming a "nice" dip.

and gnoise unfortunately doesn't compile on my machine, because it can't
find gtk - I have gtk2 and gtk3 installed (and gtk is not available on
arch linux), so I think it's just outdated :-/

I think, I'll experiment some further with audacity and probably write
my own tool at some point which conforms to my crazy opinions standard,
e.g: no change of audio, where no click is suspected, and removal of all
suspected clicks.

cheers,
Erich

On 09.12.2016 11:51, Peter P. wrote:
> Hi Erich,
> 
> * Erich Eckner <[email protected]> [2016-12-09 09:59]:
>> Dear list,
>>
>> probably this is beyond sox' scope, but maybe one of you can help anyway:
>>
>> I have some recordings (flac-files) which have emp-interference (audible
>> "clicks" of length ~ 1/2000s) in them. Do you know any scriptable tool
>> (or a plugin to sox) to extract the positions (time or sample) of
>> potential clicks?
>>
>> I know, I could track them down manually, but I would really prefer to
>> listen only to a few minutes of potentially emp'ed audio rather than to
>> many days of audio (I usually do multi channel recordings and the emp is
>> not on all channels and also very sparse on the time axis).
>>
>> Furthermore (this is probably closer to what sox can do), is there a
>> effect combination in sox (or a ladspa plugin) which can "iron out"
>> these disturbed samples (and intrapolate their values somehow from
>> surrounding samples) - given, I know the position of the samples?
> 
> A quick web research on "ladspa declick" gave the following results:
> 
> Not SoX but Audacity has Click Removal and Repair effects.
> 
> Then this link
> http://home.snafu.de/wahlm/dl8hbs/declick.html
> 
> and not sure if gnoise
> https://sourceforge.net/projects/gnoise/
> does something.
> 
> tell us how things go
> P
> 
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