The method to design an FIR filter are different from that of IIR filter. There are two methods to design an FIR filter : 1)Windowing Method 2)Frequency Sampling Method. In this design of FIR filter we are using windowing method.
There are many window functions available. Depending upon the requirements a particular window function is selected. The two main criteria for deciding the window function are 1) Attenuation in stop band 2) Transition width
There are many window functions available. Depending upon the requirements a particular window function is selected. The two main criteria for deciding the window function are 1) Attenuation in stop band 2) Transition width
With the help of Scilab a code was written to design an FIR filter using Hanning window. The attenuation in stopband was chosen accordingly and hence a low pass filter was designed.
Different windowing functions have different values of stopband attenuation.
ReplyDeleteYes and depending upon the stopband attenuation we choose the suitable window fuction for the design of filter.
DeleteWell explained
ReplyDeleteThe Different window functions are Rectangular,Hamming,Hanning and Blackmann window functions.All of them are varying in the value of As.Appropriate window function is to be used depending on the value of As
ReplyDeleteIs this better than FSM?
ReplyDeleteYes, specifically where optimum output is the requirement this method is preferred over FSM.
DeleteHanning Window gives a good response
ReplyDeleteAs we go from rectangular window function to hanning window, we get smoother response which reduces Gibbs phenomenon.
ReplyDeleteWhich window is best to avoid Gibbs phenomenon?
ReplyDeleteWindow selection depends upon stop band attenuation As
ReplyDelete