In this method, an FIR (Finite Impulse Response) filter was designed using a window function. The selection of window depends on the value of stop band attenuation entered by the user. Different window functions like Rectangular window, Hamming window, Hanning window, Blackman window can be used by taking different values of stop band attenuation.
We designed low pass and high pass linear phase FIR filters and studied the magnitude spectrum of both the filters. The values of Ap and As obtained from the graph were found close to the corresponding calculated values.
According to application, window function can be selected
ReplyDeleteyes, it can be selected according to the value of stop band attenuation required
DeleteBlackman window function gives the best attenuation but increases the order
ReplyDeleteBlackman window is the best since it has the highest attenuation in the stop band
ReplyDeleteRectangular window function gives the worst stopband attenuation
ReplyDeleteThough Blackman is better the computational effort required is more. The selection of a specific window depends on your own specifications of stop band attenuation that is specified by the user.
ReplyDeleteyess i agree with cristina
ReplyDeleterectangular window reduces computation
ReplyDeleteRectangular window function is simple
ReplyDeleteyes, it is. But it has the least value of stop band attenuation. so it is not a desired window
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