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Identifying frication & aspiration noise in the frequency domain: The case of Korean alveolar lax fricatives Kyuchul Yoon Division of English Kyungnam University Spring 2008 Joint Conference of KSPS & KASS Korean lax alveolar fricatives • Two different types of noise 2 Algorithm 3 Algorithm • Change of energy distribution in the frequency domain over time • Energy distribution on a frame-by-frame basis (e.g. 5 msec) • Sums of band energy across the reference (e.g. low cutoff) frequency • criterionValue variable determines the boundary • Assumption: Same criteronValue for same speaker 4 How Praat script works 5 How Praat script works 6 Experiment <Table 1> The list of words used in the experiment. The words marked with * was also used in the repeated series experiment. The numbers in parentheses represent the number of repetition during the recording. 7 Results & Conclusion Human 1 vs. Script 1 Repeated <Histogram 1> The histogram of differences between the manually inserted and automatically inserted boundaries for the repeated series experiment. X-axis in msec. 8 Results & Conclusion The outlier from <Histogram 1>. The difference was 6.4 msec. The m and a represents manual and automatic respectively. 9 Results & Conclusion The same-speaker-same-criterionValue assumption holds! Human 1 vs. Script 1 Non-repeated Human 2 vs. Script 2 Non-repeated <Histogram 2> The histogram of differences between the manually inserted and automatically inserted boundaries for the non-repeated series experiment with 53 words. X-axis in msec. 10 Results & Conclusion Human 1 vs. Human 2 Non-repeated Script 1 vs. Script 2 Non-repeated <Histogram 3> The histogram of differences between the two phoneticians and the two automated scripts for the non-repeated series experiment with 53 words. X-axis in msec. 11 Results & Conclusion <Table 2> The summary of the means and the standard deviations of the differences from the two experiments. The numbers are given in msec. 12 Results & Conclusion The automated identification of the boundary (labeled auto) between /s/ and /h/ in the phrase Miss Henry produced by a female native speaker of English. The f and v represent the beginnings of /s/ and the vowel following /h/. 13 References [1] Boersma, Paul. 2001. Praat, a system for doing phonetics by computer. Glot International 5(9/10). pp.341-345. [2] Yoon, Kyuchul. 2002. A production and perception experiment of Korean alveolar fricatives. Speech Sciences. 9(3). pp.169-184. [3] Yoon, Kyuchul. 2005. Durational correlates of prosodic categories: The case of two Korean voiceless coronal fricatives. Speech Sciences. 12(1). pp.89-105. 14