The break frequency, also called the turnover frequency or cutoff frequency ( in hertz ), is determined by the time constant:
2.
A formula with a break frequency of 625 Hz is given by Lindsay & Norman ( 1977 ); the formula doesn't appear in their 1972 first edition:
3.
The break frequency ( e . g . 700 Hz, 1000 Hz, or 625 Hz ) is the only free parameter in the usual form of the formula.
4.
In physics and electrical engineering, a "'cutoff frequency "', "'corner frequency "', or "'break frequency "'is a boundary in a system's frequency response at which energy flowing through the system begins to be reduced ( attenuated or reflected ) rather than passing through.
5.
Some non-mel auditory-frequency-scale formulas use the same form but with much lower break frequency, not necessarily mapping to 1000 at 1000 Hz; for example the ERB-rate scale of Glasberg & Moore ( 1990 ) uses a break point of 228.8 Hz, and the cochlear frequency place map of Greenwood ( 1990 ) uses 165.3 Hz.
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