4 Zeros Frequency Response.
Applet shows the Impulse and Frequency response of a system
with complex conjugate zeros at
z1 e±jz1f p/180
and z2 e±jz2f p/180,
4 poles are included at the origin to make the impulse response
zero for t < 0.
Vi and Vg changes gain of impulse and frequency response.
eg parameters (1.0, 100.0, 1.0, 148.0, NA, NA, NA, 0.35, 70, 0.45)
Applet shows a basic low pass configuration with zeros in the stop band. All zeros are on the unit circle, the impulse response is FINITE and SYMMETRIC and the phase is LINEAR. Moving any of the zeros away from the unit circle by changing z1 or z2 results in the
impulse response becoming asymmetric and the phase becoming nonlinear
eg parameters (1.0, 30.0, 1.0, 80.0, NA, NA, NA, 0.5, 375, 0.40)
Applet shows a basic high pass configuration with zeros in the stop band. The impulse response is still symmetric but alternates in sign.
Return to main page
Return to page index
Copyright 2008 © Cuthbert A. Nyack.