Page "Acoustics" Paragraph 18
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Wikipedia
Physicists and acoustic engineers tend to discuss sound pressure levels in terms of frequencies, partly because this is how our ears interpret sound.
What we experience as " higher pitched " or " lower pitched " sounds are pressure vibrations having a higher or lower number of cycles per second.
In a common technique of acoustic measurement, acoustic signals are sampled in time, and then presented in more meaningful forms such as octave bands or time frequency plots.
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