31. Then what happens when you mix 100 Hz and 150 Hz?

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bjkwon
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31. Then what happens when you mix 100 Hz and 150 Hz?

Post by bjkwon » June 14th, 2020, 6:12 pm

Applying the same rule{from episode 30 posting.php?mode=post&f=15}, we have a 125-Hz tone pulsating 50 times a second. However, though mathematically correct, that description doesn't represent how we feel it; i.e., this doesn't sound a 125-Hz pure tone at all. To math-lovers' disappointment, perception no longer follows mathematics. The frequency difference plays a role instead. If it is under 20 Hz, e.g., 100 and 110 Hz, we hear the tone of the average frequency with an AM that is slow enough we can actually follow. As the difference becomes larger, however, we don't follow the AM; we only hear a "rough" sound with unclear pitch.

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