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When the frequency of a sound increases, a listener says the "pitch" has gone "up", but without
a bit of musical training, he has no way to describe how far.

About the only way we have of associating "pitch" with a number is in terms of musical notes and intervals.

"Middle C" on the piano actually has several frequencies in it, but the main one is 256 Hz.
Frequencies higher than 256 Hz correspond to piano keys above (to the right of) middle-C,
and frequencies lower than 256 Hz correspond to piano keys lower (to the left).

When the frequency of a sound is doubled, the listener perceives that the pitch has gone up by one "octave".
When the frequency is lowered by half, the pitch goes down by one octave.

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15y ago

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