Fundies-ch7new - PSYCHOACOUSTICS • A branch of psychophysics The study of the relation between • the physical aspects of sound and • the

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Unformatted text preview: PSYCHOACOUSTICS • A branch of psychophysics The study of the relation between: • the physical aspects of sound and • the psychological experience of sound Threshold or Limen • Absolute Threshold-- lowest value of stimulus which can be detected • Difference Threshold-- smallest detectable change in a stimulus • These 2 Thresholds were the primary questions in CLASSICAL PSYCHOPHYSICS Thresholds Minimum Audibility Curve-- • Plot of threshold of detection (in dB SPL) as a function of frequency • Lowest thresholds in 1 to 4 kHz region Thresholds The Auditory Response Area hresholds Auditory ResponseArea • Range of useable hearing-- from threshold of detection to threshold of feeling/pain • Also called the DYNAMIC RANGE OF HEARING Thresholds Differential Sensitivity • Detecting changes in a stimulus • (e.g., how small a change in frequency can you detect) • Measured as the jnd- just noticeable difference Diff. Sensitivity//Weber’s Law Weber’s Law--A Theory of human differential sensitivity • P S/S = k • Size of jnd = constant fraction of the stimulus you start with • It’s easier to detect small changes in a stimulus if it had a small value to begin with....
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This note was uploaded on 08/23/2011 for the course SPA 3032 taught by Professor Gerhardt during the Spring '08 term at University of Florida.

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Fundies-ch7new - PSYCHOACOUSTICS • A branch of psychophysics The study of the relation between • the physical aspects of sound and • the

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