Spider DSA User’s Manual
231
Figure 142. Sample of Octave Test
Full Octave Filters
An octave is a doubling of frequency. For example, frequencies of 250 Hz and
500 Hz are one octave apart, as are frequencies of 1 kHz and 2 kHz.
Figure 143. Full octave filter shape.
Full octave analysis, i.e., 1/1 octave, displays the frequency characteristics of a
signal by passing the signal through a bank of band-pass filters with passbands
and octave wide and the center frequency of each filter an octave apart from its
neighbors. If the lower and upper cutoff frequencies of a band-pass filter are
and
, then the center frequency,
can be determined with:
The nominal frequency ratio G is determined by:
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