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Re: Normalizing calls in AviSoft

Subject: Re: Normalizing calls in AviSoft
From: "Steve Pelikan" pelikan45224
Date: Sun Jan 10, 2010 7:01 pm ((PST))

Sorry for two posts. I should have asked to start with: Why do you want to 
normalize the spectrograms?

 Could you perhaps compare spectrograms instead using some sort of correlation 
coefficient? (This has worked pretty well for me in the past)

Steve P

--- In  "alizaleroux" <> wrote:
> I have a technical question which I suspect has a straightforward answer that 
> I have somehow just not grasped...
> Does anyone know of a way to batch process a number of vocalizations (some 
> very loud, some very soft) so that their maximum amplitudes are all the same, 
> using AviSoft software? 
> I have several 100 vocalizations that I want to analyze in AviSoft. As these 
> recordings were done under natural conditions -- I had varying distances 
> between the calling monkey and my microphone -- my spectrograms all have 
> different amplitudes.
> I want to normalize all these spectrograms to have identical maximum 
> amplitudes. There is a "normalize" function under the Edit/Volume menu but I 
> can't seem to find the way to get all the different spectrograms to have the 
> same amplitude maxima. If I specify a certain % in the Normalize tab the 
> different calls still turn out to have very different maximum amplitudes.
> I can adjust the individual spectrograms' amplitudes to a specific value by 
> multiplying/ dividing it with a different value for each spectrogram but this 
> forces me to determine that value for each call individually, and apply the 
> math to each spectrogram individually. I'm certain there has to be an easier 
> way.
> Thanks so much for your help!
> Aliza

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