Acoustic Characteristics of Vowels and Consonants - Prof. Mohan, Slides of Speech-Language Pathology

Download Acoustic Characteristics of Vowels and Consonants - Prof. Mohan and more Slides Speech-Language Pathology in PDF only on Docsity!

Acoustic Characteristics Of Vowels And Consonants Presented by M. Ramana kumar

Acoustic

characteristics of

speech sounds

Acoustic characteristics

of speech sounds give

information on

articulatory nature of

sound and perception

of these sounds.

Vowels

Vowels are sound

which are produced

by an open

approximation of the

articulators.

VOWEL

CLASSIFICATIONS

5)Duratio n of vowel Short vowels (40-100msec) Long vowels 6)Tensen ess of the articulato r Tense vowels Lax vowels 7)Tone High tone Low tone Mid tone High- low tone Low- high tone High-mid tone Low -mid tone

ACOUSTIC

CHARACTERISTICS

OF VOWELS

Parameters

Spectrum Formant bandwidth and amplitudeFundamental frequencyDuration Formant pattern

• F - F
  • F
    • F

• There are basically three changes in our vocal tract that our articulators can manipulate to change formant frequencies, including, The overall length of the vocal tract The location of a constriction such as blockage or narrowing along the length of the vocal tract The degree of constriction.

Constrictions in the vocal tract can result in a lowering of F1.

• The tighter the constriction, the more F is lowered.
• F2 is lowered by a back tongue constriction, whereas a front tongue constriction will raise the

• A high tongue position increases the volume of the pharyngeal cavity, which therefore responds more strongly for lower frequencies in the glottal sound wave.
• Conversely, a low tongue position enlarges the volume of the oral cavity in

• F2 is related to length of the oral cavity that is the space in the front of the tongue constriction for the vowel.
• The longer the oral cavity is, the lower the frequencies to which it will resonate most effectively. Therefore F2 is associated with tongue advancement.