In this experiment we design LPF and HPF using frequency sampling method. Input specifications similar to the other filter designing methods were taken and the magnitude response was plotted. In this method, desired frequency response is sampled and samples obtained are taken as DFT coefficients, and then h(n) is calculated using IDFT.
It is seen that as order increases, number of lobes in stop band also increases. Since phase is linear the output signal won’t contain any distortions.
We also looked at the magnitude plots and observed the presence of lobes in the stop band for low pass filter. code:
https://drive.google.com/open?id=0BxpSA0zcKUVjMDZEU3h4UkpvR01TUjdwbm43d1RDMFYyLWpB
It is seen that as order increases, number of lobes in stop band also increases. Since phase is linear the output signal won’t contain any distortions.
We also looked at the magnitude plots and observed the presence of lobes in the stop band for low pass filter. code:
https://drive.google.com/open?id=0BxpSA0zcKUVjMDZEU3h4UkpvR01TUjdwbm43d1RDMFYyLWpB
If the order of both LPF and HPF are same, then the phase plot is same.
ReplyDeleteThanks Aishwarya for sharing that info
ReplyDeleteThanks Aishwarya for sharing that info
ReplyDeleteFrequency sampling realisation is better as it requires less computations
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ReplyDeleteit is possible to improve accuracy of the method to higher precision by defining PI accurately
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