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Summer Research Fellowship Programme of India's Science Academies

Effect of Consonant Context in Timit Vowel-Consonant-Vowel Sequences on Pitch Trend

Vaibhav Kumar

NIT Silchar, Assam 788010.

Dr. Prasanta Kumar Ghosh

Department of Electrical Engineering , Indian Institute of Science, Bangalore, Karnataka 560012.

Abstract

This study analyzes the effect of consonant context on pitch trend in TIMIT vowel-consonant-vowel(VCV) sequences. TIMIT is a collection of phonemically and lexically transcribed speech of American English speakers of different sexes and dialects sampled at a rate of 16000 Hz. TIMIT contains broadband recordings of 630 speakers of eight major dialects of American English, each reading ten phonetically rich sentences. For preparing the dataset for this experiment, VCV sequences out of the 5040 sentences is considered with C as p/t/k (unvoiced consonant) b/d/g (voiced consonant) and V as (aa/ae/aw/ax/ay/eh/ey/ix/iy/ih/ow/oy/uh/ux/y). Time stamps are obtained from GCI and pitch is calculated from these time stamps. For the analysis of pitch trend, we compute the pitch in VCV region and with the value of pitch obtained range of coarticulation using pitch values at the boundary of V1C and CV2. Thus, there is one parameter at V1C i.e anticipatory coarticulation is ACR and one at CV2 i.e carryover coarticulation is CCR from the pitch for different consonants separately for analysis in the context of consonant and on the basis of voicing characteristics of the consonant. The value of ACR and CCR is analysed in terms of percentage of ACR and CCR positive corresponding to different vowels and consonants and the distribution of their actual value and on the basis of this analysis the result is obtained.

Keywords: TIMIT, Anticipatory coarticulation, Carryover coarticulation, voiced and unvoiced consonants, GCI, ACR and CCR

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