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Dear All I feel on relatively safe ground when it comes to looking at features of speech in terms of Hz, but recently it has been recommended to us that we convert the Hz into semitones, or look specifically at semitones, in order to carry out normalisation of data. Can anyone advise us what is to be achieved by using semitones rather than Hz, and / or suggest a means of normalising data? We are looking at F0 in various populations of children (with all the problems that brings), and comparing mean F0 and pitch range. Many thanks Jane Setter [log in to unmask]