FREQUENCY SAMPLING METHOD
The frequency-sampling method for FIR filter design is a direct technique imaginable when a desired frequency response has been specified.
It consists of uniformly sampling the desired frequency response, and performing an inverse DFT to obtain the corresponding (finite) impulse response .
By using N-point filter response, the continuous frequency response is calculated as an interpolation of the sampled frequency response.
The approximation error would then be exactly zero at the sampling frequencies and would be finite in frequencies between them.
The smoother the frequency response being approximated, the smaller will be the error of
One way to reduce the error is to increase the number of frequency samples.
Are these FIR filters also called feedforward?
ReplyDeleteyes!
DeleteWell written
ReplyDeletenicely explained
ReplyDeleteIn window technique we have different window functions, which can be used as per the design specifications of filter.
ReplyDeleteyes. Depends upon the stop band attenuation needed.
DeleteThanks!
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