05 Audition

05 Audition - g. i. This bounces the “hair cells”...

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05 Audition I. Physics of Sound a. Amplitude (loudness) – how dense and rarefied the air gets in a sound wave b. Frequency (pitch) number of oscillations per second (Hertz or Hz) c. Phase (quality) – the way that sound waves build on each other to give the sound its quality i. Phase Shifts: II. The Ear a. b. The shape of the ear is like an amplifier (trapping lots of air funneling into a compact space) c. Inner ear bones further amplify the signal through the use of leverage to exaggerate movements d. The cochlea transduces that mechanical energy into neuronal energy
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e. f. The auditory nerve detects pitch by matching excitation rate to the frequency (Frequency Theory; 20 – 1000 Hz) and by where it vibrates on the nerve (Volley Theory; 1 – 22 KHz)
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Unformatted text preview: g. i. This bounces the “hair cells” against the basier membrane III. Localization of Sound a. Temporal Differences – sound arrives at one ear before the other i. Works well for lower frequencies, which tend to wrap around the head b. Amplitude Differences – sound arrives with greater amplitude in one ear over the other i. Works well for higher frequencies, which tend to be blocked by the head ii. iii. c. d. We can tell where a sound is coming from also by moving and relocating the basic direction of the source of the sound e. The penne (back of the ear) is shaped to filter out higher frequencies from the back of the ear...
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This note was uploaded on 04/17/2008 for the course PSC 231 taught by Professor Post during the Fall '08 term at UC Davis.

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05 Audition - g. i. This bounces the “hair cells”...

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