We saw two types of filters, those are IIR and FIR. The design of filter means to find H(z) in Digital filter design and H(s) in the case of Analog signal. Butterworth filters are the type of IIR filter. We used SCILAB for simulation of this filter. Where inputs such as stop band(Ws) and pass band (Wp)frequencies with their respective attenuation(As, Ap) and sampling frequency(Ws) were taken from the user.
The program was written so that to calculate the order of the filter, transfer function and plot the graph.From that graph, we came to know that, there is no ripple in the passband and stopband of Butterworth filter. Transfer function indicates poles position and order of the filter. It is a stable filter with poles lying on a unit circle. For high pass filter Ws>>Wp, Inverse of this for low pass filter.
The program was written so that to calculate the order of the filter, transfer function and plot the graph.From that graph, we came to know that, there is no ripple in the passband and stopband of Butterworth filter. Transfer function indicates poles position and order of the filter. It is a stable filter with poles lying on a unit circle. For high pass filter Ws>>Wp, Inverse of this for low pass filter.
Nice
ReplyDelete