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by: Dorris Borer


Dorris Borer
GPA 3.84


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Class Notes
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This 1 page Class Notes was uploaded by Dorris Borer on Monday September 28, 2015. The Class Notes belongs to ESE250 at University of Pennsylvania taught by D.Koditschek in Fall. Since its upload, it has received 18 views. For similar materials see /class/215449/ese250-university-of-pennsylvania in Electrical Engineering at University of Pennsylvania.

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Date Created: 09/28/15
ESE250 Spring 2010 February 11 2009 Big Idea Week 5 Receiver Model for Human Pychoacoustics Human sound perception involves both mechanical anatomical transduction apparatus and electro chemical neural processing The mechanical sensing apparatus the linkage of bones connecting the eardrum to the cochlea is directly stimulated by vibrational frequencies arising from acoustic pressure waves As a result it effectively passes a harmonic or frequency representation as discussed in week 4 of the sound wave into the neural inputs to the cognitive stages of auditory processing Understanding the mechanics of this receiver helps us derive a model of human psychoacoustics This model can be used to explain and understand the limits of our audible perception From experimentation and consistent with this model we see 0 Vibrational sensitivity of the cochlea gives rise to the range of frequencies we can hear Humans perceive frequencies roughly between 20Hz and 20000Hz 0 Human auditory perception reduces continuous acoustic waveforms to a representation based around roughly two dozen frequency bands These are termed critical bands 0 Within a critical band certain patterns of sound can render others imperceptible Lei masked when played simultaneously or in suf ciently close sequence Such auditory processing is to a signi cant extent decoupled between critical bands so that masking effects in one band are largely independent of the others 0 Our sensitivity to sounds varies across the bands with the highest sensitivity in the 274KHZ range Sensitivity diminishes toward both the high and low frequency ends of the audible spectrum This receiver model is valuable in engineering and compressing sound waves It allows us to distin guish the aspects of the sound wave that are actually important to reproduce from the aspects that are unimportant and can be discarded without perceptual distortion That is it tells us which information in an audio signal cannot be sensed by humans such that omission in a lossy encoding does not noticeably affect the perceived sound University of Pennsylvania Koditschek amp DeHon


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