In a typical back-pocket model (Landy & Oruc, 2002, their Figure 1), the input image goes through a set of linear, band-pass, spatial filters (first-order channels); then, a point-wise non-linearity (full-wave rectification) is applied to the outputs; and finally, a second-order, linear, low-pass or lower spatial-frequency tuned band-pass filter
is used (see the flowchart in Figure 2B).
A band-pass filter
chooses the coefficients [c.sub.j] to isolate (or "pass") a specific range (or "band") of cyclical components.
This causes a peak in the noise spectrum, which is excluded effectively by the 25-45 kHz band-pass filter
Like the HP filter, the band-pass filter
is a two-sided filter.
The seeker could use two different detectors to monitor the energy levels in the two bands (for example, lead sulfide for the short band and indium antimonide for the long band) or use a single detector with different band-pass filters
on the reticle spokes.
 suggested a method based on mathematical morphology whose application was limited because it required high pretreatment, followed by Ruha et al.'s  practical matching filter, which was a 15-40 Hz band-pass filter
, to detect QRS wave for better signal-noise ratio.
Note that the dual-band band-pass filter
is directly connected to the antenna, and the mismatch loss is correspondingly reduced.
Chen, "Miniaturized dual-mode substrate integrated waveguide (SIW) band-pass filters
loaded by double/single T-shaped structures," Progress In Electromagnetics Research Letters, Vol.
Wavelet transform is widely applied for temporal and frequency analyses of signals as well as a band-pass filter
. The latter case is called wavelet decomposition.
In a blood pressure measurement design, it can function as a 4-pole band-pass filter
for arterial vibrations.
has launched a, family of widely tunable optical band-pass filter
products for 50 GHz or 100 GHz channel spacings across the C- or L-bands.
A repeater cannot be designed to comply with the above specifications by using a common RF band-pass filter
unless cost is no object.