8th Experiment
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.
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.
No of lobes in frequency response increased with increase in order
ReplyDeletePhase spectrum is linear within the positive lobes of magnitude spectrum.
ReplyDeleteMagnitude Spectrum has discontinuity when there is a change in magnitude (from positive to negative)
DeleteWherever the lowest peak was observed in magnitude response, corresponding zero crossing was observed in phase response.
ReplyDelete