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normalisation for spectral levels

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?


Christel de Bruijn


Christel de Bruijn
Department of Human Communication Sciences
University of Sheffield, UK