Equivalent rectangular bandwidth
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The equivalent rectangular bandwidth or ERB is a measure used in psychoacoustics.

Researchers have derived a differential equation giving the ERB value in Hz of a human auditory filter with a center frequency of kHz

Solving this equation gives roughly the following relation between the ERB value and the frequency in Hz:

Or the converse:

The original article can be found at: http://en.wikipedia.org/wiki/Equivalent_rectangular_bandwidth.
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