PSY-3215 Lecture Notes - Lecture 28: Absolute Threshold, Sound Intensity
Document Summary
Frequency hz cycles per second. Developed scales for physics and psychological scale. Variable tone adjust the tone until it sounds twice as loud. Magnitude estimation use a reference tone of 1000 hz at 40 db. Variable tone adjust the frequency until it sounds like twice the pitch. Between ~1000 - 3000 hz linear relationship. Outside of this range that relationship falls apart. Absolute threshold in db as a function of frequency. ~2,000 hz, absolute threshold is at ~0 db. ~20 hz, absolute threshold is at ~80 db. ~20,000 hz, absolute threshold is at ~20 db. How loud a tone is will depend on the frequency you can not predict loudness from just sound intensity / loudness is not independent from frequency. Take a reference tone, 1000 hz at 40 db, and play it. Adjust amplitude of other frequencies to be of equal loudness as the reference tone.
