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The Acoustics and Perception of American English Vowels

The Acoustics and Perception of American English Vowels. Conventional F 1- F 2 Plot. Acoustic Vowel Diagram. Peterson & Barney (1952) Study conducted at Bell Labs. The 1 st big acoustic study carried out with the (then) recently invented sound spectrograph machine. 1. Recordings

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The Acoustics and Perception of American English Vowels

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  1. The Acoustics and Perception of American English Vowels Hillenbrand: Vowels

  2. Hillenbrand: Vowels

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  9. Conventional F1-F2 Plot Acoustic Vowel Diagram Hillenbrand: Vowels

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  12. Peterson & Barney (1952) Study conducted at Bell Labs. The 1st big acoustic study carried out with the (then) recently invented sound spectrograph machine. 1. Recordings 10 vowels (i,ɪ,ɛ,æ,ɑ,ɔ,ʊ,u,ʌ,ɚ) /hVd/ context (“heed,” “hid,” “head,” “had,” etc.) 76 talkers (33 men, 28 women, 15 children) 2. Measurements: F0, F1-F3 3. Listening Study 70 listeners asked to identify each test signal as one of ten words (“heed,” “hid,” “head,” “had,” etc.) Hillenbrand: Vowels

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  17. Same Data as Previous Figure, but Plotted on a Single Graph Hillenbrand: Vowels

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  21. Training Testing Hillenbrand: Vowels

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  23. What does this mean? It appears as though listeners are recognizing vowels based on information other than F0 and F1-F3. What are the possibilities? Two Candidates: · Duration · Patterns of spectralchange over time Hillenbrand: Vowels

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  25. Original Duration Neutral Duration Short Duration Long Duration Hillenbrand: Vowels

  26. Logic: If duration plays no role in vowel recognition, the 4 signal types ought to be equally intelligible; i.e., artificially modifying duration will not affect what vowel is heard. On the other hand, if duration plays a role in vowel perception, the OD signals ought to be more intelligible than any of the duration-modified signals. • Also, there are specific kinds of changes in vowel identity that we would expect. For example: • Shortened /i/ ought to be heard as /I/ • Lengthened /I/ ought to be heard as /i/ • Shortened /A/ ought to be heard as /‰/ • Lengthened /‰/ ought to be heard as /A/ • Shortened /u/ ought to be heard as /U/ • Lengthened /U/ ought to be heard as /u/ • Shortened /å/ ought to be heard as /ú/ • Lengthened /ú/ ought to be heard as /å/ Hillenbrand: Vowels

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  29. Effects of Duration on Vowel Perception • Original Duration, Long Duration, Short Duration Hillenbrand: Vowels

  30. The Role of Spectral Change in Vowel Perception Hillenbrand: Vowels

  31. More examples. Note especially the rise in F2 for /U/ and /ú/. Hillenbrand: Vowels

  32. Here’s another way to visualize patterns of formant frequency change in vowels: This figure shows formant frequencies measured at the beginning of the vowel and a 2nd time at the end of the vowel. (The phonetic symbol is plotted at the 2nd measurement). Note that some vowels (e.g., /i/ and /u/) are pretty steady over time, but others have formants that change quite a bit throughout the course of the vowel (e.g., /e/, /o/, /ú/, /U/, /A/, /I/). Hillenbrand: Vowels

  33. NAT:Naturally spoken/hAd/ OF: Synthesized, preserving original formant contours FF: Synthesized with flattened formants Hillenbrand: Vowels

  34. Key comparison is OF vs. FF: If the formant movements don’t matter, flattening the formant contour will not affect the vowel percept, and the recognition rates for OF and FF should be very similar. On the other hand, if the formant movements are important, the FF signals will be less intelligible than the OF signals. Conclusion: Spectral change patterns do matter. Hillenbrand: Vowels

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