CSD 2101 Lab 8 Acoustics of Vowels

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University of Vermont *

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2010

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Computer Science

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Dec 6, 2023

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Uploaded by ElderHare2613

CSD 2101/ Lab 8 Name Sonja Maloy Open the speech sample labeled “Lab 8 vowel 1” and “Lab 8 vowel 2” in Praat. Select Annotate-To TextGrid. Highlight both the wav and text grid and select View & Edit. Listen to the speech sample. Turn on “Show Formats”. 1. What is the F1 for the vowel “ee”? (1pt) 400 Hz 2. What is the F2 for the vowel “ee”? (1pt) 2700 Hz 3. What is the F1 for the vowel “a”? (1pt) 900 Hz 4. What is the F2 for the vowel “a”? (1pt) 1100 Hz 5. What is F1 representing? (2.5pts) 6. What is F2 representing? (2.5pts) Open the speech sample “Lab 8_Bottle_Male” and “Lab 8_Bottle_Female” in Praat. Select Annotate- To TextGrid. Highlight both the wav and text grid file and select View & Edit. Listen to the speech sample. 7. Mark where the vowels are using the boundaries. (2pts) 1 The F1 represents the width of the pharyngeal cavity. F2 is representing the oral cavity.

8. Label each vowel in Tier 1. 9. What is F1, F2 and the F1/F2 ratio for the first vowel in “Lab 7_Bottle_Male”? (2pts) F1: 800 Hz F2: 1100 Hz Ratio: 300 Hz 10. What is the F1, F2 and F1/F2 ratio for the first vowel “Lab 7_Bottle_Female”? (2pts) F1: 830 Hz F2: 1299 Hz Ratio: 469 Hz 11. Why are these values relatively similar across speakers? (2pts) 2 This is because vowels are identified by their formants. They have similar ratios which is how we identify different vowel sounds in speakers. All vowels are periodic so it is a periodic sound traveling through an open tube the vowel is still traveling in the same way regardless of different pitches.

12. What information does a spectrogram give you? How does it differ from a spectrum? (1pt) 3 The spectrogram gives more information about the sound and you can see the formants and the voiceless or voiced sounds and you can also see the difference in consonants versus vowels. In a spectrum you are only given the frequency and the amplitude and cannot see the difference. A spectrogram is over time while a spectrum is only a slice of time.

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