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For a set of contiguous one-third octave bandpass filters, frequency
of a specified series such as the preferred frequency series that
includes 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, and 1000
hertz, extended by successive multiplication or division by 10. For a
set of contiguous octave bandpass filters, the nominal midband frequency
is one of a series such as the preferred frequency series that includes
16, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, and 8000 hertz, extended
by successive multiplication or division by 10. Unit, hertz (Hz).
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