10-14-25 Vowels Lecture 12

Chapter 10: Vowel Identification

Introduction

  • Clarification of syllabus error regarding reading assignment.

    • Only the first three pages relevant to current topic ("bowels").

  • Transitioning to more detailed vowel identification beyond Peterson and Marnie methods.

Vowel Identification and Formants

  • Importance of understanding vowel characteristics.

    • Vowels identified by their first three formants (F1, F2, F3).

  • Focus primarily on the first two formants for vowel perception.

    • Introduction of the third formant (F3) as necessary for distinguishing similar vowels.

Formants Overview

  1. F1 (First Formant)

    • Inversely proportional to tongue height:

      • High tongue position results in low F1 value.

      • Low tongue position results in high F1 value.

    • Example: For the [i] vowel ("e"), the tongue is high, resulting in a low F1 where:

      • Tongue touches back molars at the top of the mouth.

  2. F2 (Second Formant)

    • Relates to front-back positioning of the tongue:

      • Fronted tongue results in higher F2 value.

      • Retracted tongue results in lower F2 value.

  3. F3 (Third Formant)

    • Indicates lip rounding:

      • Lip rounding lowers F3 value.

      • F3 also affects the overall formant frequency range but is less critical in English vowel identification.

Language Variations in Vowel Systems

  • Danish language has more vowel distinctions due to varied tongue heights and advacement:

    • Lip rounding crucial in distinguishing vowels (e.g., [e] vs [ε]).

    • Unlike English, where such distinctions are less prominent.

Analysis of Vowel Space

  • Peterson and Barney chart utilized for understanding formant relationships in vowels.

    • F1 is vertically placed (height), whereas F2 is horizontally placed (front-back).

  • Vowel classification based on features of tongue height and position:

    • Example:

    • High front vowel (e.g., [i]) expected to have low F1 and high F2 values.

    • Low back vowel (e.g., [ɑ]) expected to have high F1 and low F2 values.

  • Limits on formant frequencies to be aware of:

    • Highest F1 does not exceed certain thresholds:

    • Approximately 640 Hz for men; about 800 Hz for women.

    • F2 values exceeding 2000 Hz observed in women's higher frequency production.

Diphthongs

  • Diphthongs show formant movement on spectrograms:

    • Continuous shifts indicate vowel transitions.

    • Analysis of vowel transitions as movement through spectral space.

    • Example of diphthongs:

    • ID to measure formant shifts from beginning to end positions.

Vowel Example Calculations

  1. Evaluation of vowel shifts in specific instances (e.g., shift from [aɪ] in "my" to its corresponding vowel characteristics).

    • Anticipated shifts in F1 (lower) and F2 (higher).

  2. Evaluating vowel pairs:

    • [aɪ] and [eɪ]: Expect subtle shifts yet significantly distinct.

  3. Vowel positions and expected movements across formant spaces.

Spectrogram Interpretation

  • Spectrograms act as visual representations of frequency and formant level.

  • Identification of nasalized sounds vs. voiced sounds:

    • Nasal sounds characterized by reduction or absence of higher formants (primarily F2).

    • Loss of formant clarity results in indistinctive sounds which can’t be identified merely as vowels.

Nasal Sounds

  • Production of nasal sounds through lowering the soft palate:

    • Opening to nasal cavities results in significant sound filtering, lowering overall acoustical intensity.

  • Spectrograms show nasal vibrations characterized by prominent low frequencies.

Sound Quality and Energy Loss

  • Nasals present diminished sound energy overall:

    • Presence of thick bandwidths indicating first formant prominence without second formant clarity.

  • Differences in energy between nasal and non-nasal sounds:

    • Oral tones display recoveries of second formants showing clarity.

Long vs. Short Vowels

  • Distinction between long and short vowels through duration and stress.

    • Long vowels can pronounce their phonetic name (e.g., "beat" vs "bit").

  • Duration analysis on spectrogram reveals vowel lengths indicating sound perception:

    • Long vowel ("beat") characterized by lower F1 and higher F2 compared to short vowels.

Closing Remarks

  • Review of important concepts covered in this session.

  • Preparation for practical lab work on formants and vowel/diphthong identification in real sounds.

  • Encouragement to familiarize with Peterson and Barney vowel charts for next examination.

  • The transition towards the next chapter will encompass consonant and diphthong identification and more nuanced spectrographic analysis.