LINB09H3 Lecture Notes - Lecture 6: Vocal Folds, Vocal Tract, Formant
Document Summary
The way we hear sounds depends on their amplitude and resonant frequencies. Explains why some sounds are perceptually confusable. Vowels more easily characterized acoustically (through measurement) Crucial for automated speech recognition (asr) and speech synthesis: recording someone is easier than mri, and other machinery that monitors movement. Sound waves are traveling pressure fluctuations that propagate through a medium (ex. air, water), caused by pushing and pulling of air molecules (slinky style). Sound perception: pull and push on eardrum and are transmitted to cochlea. Tympanic membrane vibrates which reverberates into cochlea (where sound perception occurs, hairs of cochlea are sensitive to vibration) Simple periodic waves: pure tone (sine wave; simplest sound wave, y-axis = amplitude. Taller the sign wave, louder the sound. 120db threshold of pain: x-axis = frequency, time. Whole repetitions of a wave, one cycle. Greater the frequency of the wave, higher the pitch of the sound.
