Section1-7 - 1/26/12 The Psychophysics of Sound Perception...

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1/26/12 1 Fourier Synthesis • Adding “out of phase” —> cancellation – Practical application: noise canceling headphones • Adding harmonics —> Timbre – Practical application: electronic instruments (synthesizer) Psycho- Physics Percept Scale Property Scale Pitch Mels (or tone height/chroma) Frequency Hz Loudness Phons Intensity dB (Too bad it isn’t just Pitch = Hz and Loudness = dB) The Psychophysics of Sound Perception Detection • Intensity needed for detection (threshold) depends on Frequency • Audiogram : plot of threshold intensity (y) across frequency (x) Note: Commonly use log scale Note: dB IS a log scale Most sensitive Audiograms for various species Typical human range about 20 - 20 kHz
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1/26/12 2 Phons: perceived loudness at 1 kHz Equal loudness contours Loudness depends on both dB and Hz! Scaling Pitch is highly infuenced by Frequency (remember Steven’s power law?) Mel scale: 1000 mels=perceived pitch o± 1000Hz tone at 40dB above individual’s threshold. BUT, Changing Intensity o± pure tone can infuence perceived pitch!
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This note was uploaded on 04/09/2012 for the course EXP 3202 taught by Professor Staff during the Spring '12 term at Florida State College.

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Section1-7 - 1/26/12 The Psychophysics of Sound Perception...

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