Re: normalisation for spectral levels (Pierre Divenyi )

Subject: Re: normalisation for spectral levels
From:    Pierre Divenyi  <pdivenyi(at)EBIRE.ORG>
Date:    Wed, 24 Sep 2003 10:37:55 -0700

Christel, Rather than getting hung up on formant-peak amplitude differences, it would be more appropriate to look for changes in formant bandwidth and peak-to-adjacent-trough ratio. Another way would be to see to what extent the different exemplars diverge from either a generic neutral vowel or from formants generated by a uniform tube, as suggested by Rene' Carre' (ask him for reference, carre(at) Pierre Divenyi At 01:46 PM 9/24/2003 +0100, Christel de Bruijn wrote: >Dear list, > >I apologise if the following question appears to be trivial. I would be >very grateful for an answer though. > >I would like to compare formant amplitude levels (in dB, measured from a >spectrum) of a sustained vowel before and after a reading task. However, I >adjusted the recording level for each vowel, in order to optimise SNR. > >Therefore, it does not make sense to compare absolute dB levels. > >I was wondering if I could do a simple normalisation for each vowel by >substracting its RMS value (after converting it to a dB value) from its >formant level. > >Could I then compare the formant levels, or is this too simple? > > >Regards, > >Christel de Bruijn > >----- > >Christel de Bruijn >Department of Human Communication Sciences >University of Sheffield, UK

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