quiz9_08 - too high You would like to keep your filter as...

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ECEN 487 QUIZ 9 NAME:_________________ 3. What window type would you choose for a bandpass filter design if your primary concern is rejecting an interfering source that is known to be very close to your desired passband corner frequency? a) Hamming; b) Rectangle; c) Dolph-Chebychev ± = 2.5; d) Bohman; e) Gaussian; f) Triangle. Answer: (b), since it will yield narrowest transition bands. 4. Suppose you have designed a bandpass filter using the windowed filter method and that its frequency response exactly meets the specified transition bandwidths and stopband ripple levels, but the passband ripple level is
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Unformatted text preview: too high. You would like to keep your filter as short as possible to keep computations down. What should you do? a) Increase filter length N . b) Change your window choice or change window parameter (e.g. ± in a Kaiser-Bessel window) since your window is not sufficiently tapered. c) Do both (a) and (b). d) Do neither (a) or (b) or else you will violate filter design specifications. Answer: (c), since you must use a more tapered window to reduce passband ripple level, but this will increase transition bandwidth. You can then reduce transition bandwidth by increasing N....
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