beats between tones and subjective tones (at)

Subject: beats between tones and subjective tones
Date:    Wed, 2 Jul 1997 11:25:23 -0400

To Auditory List Re Beats between tones and subjective tones. Tonal monaural diplacusis is a common effect. To hear it, you adjust the frequency of a sine tone with the level within about 10 dB of threshold and find a frequency where beating or roughness appears. The recommended frequency range is near the octave from 1 to 2 kHz where threshold microstructure is strong. Any background noise, linearizing the cochlea, may destroy the effect. The sensation can be quite striking as one tunes to the right frequency ... pure tone sound, and then, suddenly, roughness or buzzing. Tonal monaural diplacusis and threshold microstructure are both associated with cochlear emissions. Dips in the microstructure and TMD occur for signals close in frequency to the emissions. Unfortunately, these emissions are not the same as tinnitus. The case of the piano tuner experiencing beats for high level tones still seems rather mysterious to me. Bill Hartmann

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