By multiplying the highpass filter
[H.sub.f](jw) and the all pass system [H.sub.p](jw), the expression is given as follows:
The wideband beam is separated into the eight channels by quasi-optical focusing highpass filters
. Adjacent bands are detected in orthogonal linear polarizations and all bands are observed simultaneously.
The design of filters in different frequency ranges demonstrated that this new filter type has several advantages over the well-known lowpass and highpass filter
combination, including reduced size requirements, leading to less excitation of higher waveguide modes; and improved filter properties with improved group delay characteristics.
In , a UWB bandpass filter was proposed using a combination of lowpass and highpass filters
(HPF), which is convenient to design.
Bandpass filters are composed of cascaded lowpass and highpass filters
, or used to suppress higher order harmonics in lowpass or bandpass filters .
The vibration signal is pre-processed, it means it is highpass filtered
, synchronized and converted from the time domain into the crankshaft angle domain.
The experimental setup is divided into three parts, in first part ECG signals processed to remove baseline wander noise by designed FIR and IIR highpass filters
, in second part high passed ECG signals passed through lowpass FIR and IIR filters to remove muscle noise artifact and in third part IIR notch filter used to remove 50/60 Hz power component noise as shown in Fig.
Filtering for the appropriate carrier frequencies takes place in the hearing organ, and subsequent filtering for SRI takes place using a pair (one for each ear) of output neurons that act as lowpass filters, followed by another pair of neurons that act as a highpass filters
. Source localization is accomplished by using directional ears and a combination of excitation and inhibition in the same neurons that perform the highpass filtering.