CMD 278 Lecture Notes - Lecture 10: Headphones, Sound Intensity, Reverberation

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8 Nov 2016
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Most of the frequencies contained in speech are in the range where hearing is most sensitive. There are many sounds that exist in the atmosphere that are outside of our ability to detect sound at certain frequencies. The human audibility curve represents auditory sensitivity across frequencies. 60 dbspl, 60 hz hum from fluorescent lights. The shortest duration that produces a sensation of tonality is about 10 ms for many. The auditory system integrates energy over time meaning a longer stimulus is. The ear"s sensitivity to a tone will improve up until the tone is around 300 ms long. The improvement in detection with a longer stimulus duration is called temporal pure tones integration or summation. Temporal integration function for individuals with normal auditory function is relatively constant over a wide range of frequencies. The magnitude of this function is reduced for individuals with cochlear hearing loss.

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