IIR Filter Design
- Butterworth, chebyshev & elliptic techniques.
- Impulse invariance and bilinear transformation methods are used for translating splane singularities of analog filter to z-plane.
- Frequency transformations are employed to convert LP digital filter design into HP, BP and BR digital filters.
- All pass filters are employed to alter only the phase response of IIR digital filter to approximate a linear phase response over the pass band.
The system function = H(s)
The frequency transfer function = H(j Ω ) = H(s) / s=j Ω
The power transfer function =|H ( j Ω)2=H(j Ω ) H*(j Ω ) = H(s) H(-s) / s=j Ω
To obtain the stable system, the polse that lie in the left half of the s-plane are assigned to