LINB09-07-Vowel-Acoustics-Suprasegmentals.pdf - Vowels Suprasegmentals Acoustics II Vowels Suprasegmentals Lecture 7 1 Vowels Suprasegmentals Last

LINB09-07-Vowel-Acoustics-Suprasegmentals.pdf - Vowels...

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Vowels Suprasegmentals Acoustics II: Vowels & Suprasegmentals Lecture 7 October 30, 2018 1
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Vowels Suprasegmentals Last time… Sound waves Periodic vs. aperiodic waves Frequency & Amplitude Volume & Pitch Complex periodic waves & how they are composed Harmonics, resonance, & formants Fundamental frequency (f 0 ) Oscillograms Intensity vs. time Spectra Intensity vs. frequency Spectrograms Frequency vs. time vs. intensity Narrow-band vs. wide-band 2
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Vowels Suprasegmentals Narrow-band spectrograms Analysis window length 30–50ms Quite long! Blurs out temporal information Good frequency resolution! Shows individual harmonics However, frequency information is too detailed to pick out formants easily Frequency (Hz) 0 5000 Sound pressure level (dB / Hz) -60 -40 -20 0 20 Time (s) 9.114 9.192 0 5000 Frequency (Hz) 3
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Vowels Suprasegmentals Wide-band spectrograms Analysis window length 5ms Quite short! Good temporal resolution: can see individual glottal pulses Poor frequency resolution: blurs out harmonics This makes formant shapes easier to make out Frequency (Hz) 0 5000 Sound pressure level (dB / Hz) -60 -40 -20 0 20 Time (s) 9.114 9.192 0 5000 Frequency (Hz) 4
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Vowels Suprasegmentals Today… Learning to read spectrograms!
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  • Vowel, International Phonetic Alphabet, glottal pulses

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