PSL300H1 Lecture Notes - Lecture 25: Tympanic Duct, Oval Window, Cochlear Duct
Document Summary
Pinna flesh of the ear, gathers & filters sound. Timpanic membrane/eardrum membrane that vibrates when should hits it. Connected to the pharynx via eustachian tube. Sound (ie pressure waves in the medium [air]) At the peak: molecules closely together, high pressure. At the troughs: molecules spread out, lower pressure. Translates into pitch: low-frequency = low pitch, high-frequency = high pitch. 16-20,000 hz humans" pitch range: ~10 octaves, highest affinity: 1000-3000, middle c: ~261. 6 hz. The pressure difference b/w peak & trough. The main factor for our perception of loudness: frequency also factors into loudness. If the sound is outside of our frequency, no matter how high the amplitude, we can"t hear it. Inner ear concentrates the sound: from very large eardrum vibration of the little bones passes the vibration very efficiently vibrates the very small oval window. Organ responsible for transducing waves electrical signals.
