P0 is a specific harmonic peak which is reinforced by resonances within the nasal passages.The amplitude of A1, though, will not vary by vowel quality 2. The frequency of F1 will vary from vowel to vowel, tending to be lower for high vowels and higher for low vowels. F1 can be located as described in Section 6.6.A1 is the highest harmonic near the frequency of the first formant.To compute A1-P0, you need to take three main steps3 : 1. See Figure 6 for an illustration of these peaks in spectra. Like spectral tilt, it's a ratio measure of the amplitudes of two harmonics: A1, which is the highest harmonic peak near the first formant, and P0, which is a low frequency harmonic (usually H1 or H2) which corresponds to a low resonance in the nasal passages. Ħ.12 Measuring Nasality using A1-P0 A1-P0 is an acoustical measure of nasality first described by Marilyn Chen in Acoustic correlates of English and French nasalized vowels (). For more information on the specifics of this license, go to. Using Praat for Linguistic Research by Will Styler is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Important! This document will be continually updated and improved. Using Praat for Linguistic Research Will Styler University of Colorado at Boulder Phonetics Labĭocument Version: 1.3.5 Last Update: March 22, 2013
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