1 / 8

Understanding Vocal Acoustics: Anatomy, Sound Production, and Resonance

This lecture explores the biomechanics of vocal sound production through the anatomy of the vocal fold and the role of air flow, which creates a "buzzing" sound similar to the lips. It discusses how frequency, affected by the thickness of the vocal folds and muscle control, determines pitch. The vocal tract functions as a resonator, with fixed length and shape influencing the resulting timbre of vowels via resonance frequencies known as formants. Through visual tools like spectrograms, students learn about the relationship between pitch, harmonics, and vowel production.

prem
Télécharger la présentation

Understanding Vocal Acoustics: Anatomy, Sound Production, and Resonance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PHYS 103 lecture 29 voice acoustics

  2. Vocal anatomy Air flow through vocal folds produces “buzzing” (like lips) • Frequency is determined by • thickness (mass)  men have lower pitch • muscle control (stiffness) • Vocal tract acts as a resonator • length is fixed (15-20 cm)

  3. Vocal Spectrum Sound entering the trachea is close to a pulse train ( many harmonics of nearly equal amplitude) Similar to organ reed: frequency of vocal folds is not much susceptible to feedback (vocal tract resonances) – it is determined mainly by muscular control

  4. Vocal spectrum final sound filter vocal tract resonances + source pulse train vocal folds “buzz”

  5. How we get vowels Recall: timbre of sound depends on the relative amplitude of harmonics pitch depends on the frequency of the fundamental Different vowels (same pitch) are essentially different timbres Resonance frequencies of vocal tract shape the spectrum -> determine timbre Resonance frequencies of the vocal tract are called formants We control the frequencies of formants by changing the shape of the vocal tract First formant typically controlled by mouth opening Second formant typically controlled by tongue position

  6. Example spectra first formant aaa (wide open mouth) iii (mouth more closed) ooo

  7. More examples – effect of tongue placement second formant uuuu wrwr

  8. The spectrogram:a tool for measuring the voice spectrum amplitude frequency spectrogram frequency time

More Related