3 programs Praat, Multispeech & Wavesurfer 3 analysis parameters LPC order, analysis (frame/window) width, pre-emphasis Word list 5 vowel categories 6 tokens per category read 3 times total = 90 tokens 2 speakers Peter French & me 2 simultaneous recordings microphone & telephone Slide 4 l 4 Results & Analysis Scripts used to obtain 37,260 individual formant measurements using LPC formant trackers Analysis microphone data only Initial observations of raw formant data Quantitative analysis of results Statistical analysis Slide 5 l 5 My F1s from Praat LPC Variation FLEECETRAPPALMGOOSESCHWA Slide 6 l 6 The Plot Shows Scripts work (used in fault finding) Vowel categories clear Greatest deviation LPC orders 6 & 8 Orders 10 to 18 very similar for FLEECE, GOOSE & SCHWA Generated many more plots for all formants, parameters & software Lots of variation Difficult to interpret Slide 7 l 7 Quantitative Analysis Quantitative Difference Analysis No absolute measurement to compare formants with outcome of analysis, not directly comparable with acoustic reality Difference calculated between value obtained with default analysis settings Absolute difference calculated for each formant then averaged by vowel category Shows variation between two analyses Slide 8 l 8 Observations Numerical analysis confirmed impression from plots Clear differences between vowel categories, speakers, formants, software & settings Complex set of results with no clear patterns Slide 9 l 9 Statistical Analysis Paired t-test between measurements from default settings and varied settings for each vowel category Null hypothesis altering analysis settings no effect Exp hypothesis altering analysis settings effect Number of significant hits summed max 15 Higher number = greater variation in formant measurements 2 significance levels 0.01 & 0. WaveSurfer Mac binary now uses Tcl/Tk 8.4.9. Automatically generated plots will not generate 'Unsaved changes' dialog on exit as default anymore. Chooser-dialog now handles auto-play, Windows path names and sorting. Philip Harrison J P French Associates & Department of Language & Linguistic Science, York University IAFPA 2006 Annual Conference Gteborg, Sweden Variability of Formant Measurements Part 2 Slide 2 l 2 Summary Briefly recap previous analysis & last years presentation New analysis & results PhD research Questions Slide 3 l 3 Study Aim: Investigate the variability of formant measurements which exists both within and between different software programs currently used in the field of forensic phonetics. -config option can now also specify a full path name.
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