CDIS 3123 Lecture Notes - Lecture 3: Vestibular Nerve, Otitis Externa, Brainstem
26 Jan 2017
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Document Summary
Characteristics of sound and the outer, middle, & inner ear. Audiogram graph of thresholds of hearing sensitivity as a function of frequency: x-axis frequency, y axis intensity, audiogram is turned upside down, x-axis is on top of graph instead of on bottom. So the lower the frequencies go, the louder the sound: on the y-axis is hearing level in db (intensity) Hearing level (hl) refers to the db level of a sound referenced to audiometric zero. Frequency number of cycles per 1 second, expressed in hertz (hz) Pitch perception of frequency. (frequency heard and perceived by human ear) Period - length of time for a sine wave to complete one cycle (typically referenced under 1 sec. ) Hertz unit of measure for frequency. Pure tone sound wave having only one frequency of vibration: 250 cycles per second is a pure tone. Sinusoid periodic wave that repeats itself at regular intervals over time. Spectrum distribution of magnitude of frequencies in a sound.
