summation tone
music
Quick Summary
A summation tone is a faint tone produced in the inner ear when two musical tones are played simultaneously. This tone is not from the original sound source but is a subjective or resultant tone created by the ear. There are two types of combination tones: difference tones and summation tones. A summation tone's frequency is the sum of the frequencies of the two original tones. These tones are heard when two pure tones with a frequency difference of at least 50 cycles per second are played at a sufficient intensity.12
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