Re: [Audacity-devel] [Audacity-cvs] audacity-src/src/effects TruncSilence.cpp, 1.13, 1.14

[Gale A. <ga...@au...>]

    | From James Crook <cr...@in...> 
    | Wed, 19 Sep 2007 11:57:13 +0100
    | Subject: [Audacity-devel] [Audacity-cvs] audacity-src/src/effects
    | TruncSilence.cpp, 1.13, 1.14
    | There has to be some threshold, because otherwise low frequency sound 
    | will be snipped 'mid cycle'.  A 100ms pause is really very short, 
    | consider the silence between the t's in the word 'butter'.  Someone who 
    | sets 0 or 99ms should still see sound removed, not an effect that does 
    | not work, so very low settings amount to 'remove as much silence as 
    | possible without artefacts'.

Hi James

Yes they will see silence removed, but not the amount they asked for, so 
will believe there to be a bug in the effect and will be telling us so (unless
this is made explicit, or values lower than 100ms cause OK to be greyed
or some other solution).     


    | We could reduce the threshold even as low as 17ms I suppose, since most 
    | sound cards filter below 30Hz, and we only need half a cycle.  Your call.

Any silence above about 5 ms is going to be audible in music. Are these 
artefacts with say a 1 ms threshold audible to you and what do they sound 
like? They aren't to me, but I only have middle-aged hearing. If the artefacts 
are minor and won't worry most people, then I'd suggest that's a price worth 
paying to get the original functionality back again, even if we disallow zero in
"max silence duration" to get over the original problem, and even if we have 
to document the possible artefact at low thresholds. After all, noise removal 
has artefacts depending on the settings you make. It should be a user choice 
I think as to what sounds best for them.     

 
    | Probably best to post queries like this to audacity-devel or direct to 
    | me rather than to audacity-cvs as I tend not to read audacity-cvs.

The original message was posted to -devel list and appears in the Nabble
-devel list archive, it just had [audacity-cvs] in the subject.


Gale 






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