As we saw in section 5.3, an FIR filter is easily constrained to have one of two particularly useful properties: namely, linear-phase or linear-plus-90°-phase response corresponding to even or odd symmetry, respectively, in its impulse response. Therefore, techniques for the design of FIR filters are of considerable interest. The transformation techniques of the preceding chapter are not applicable to FIR design because, in general, they produce filters with poles, as well as zeros, and thus with infinite-duration impulse responses. The four general techniques most commonly employed for FIR design are described in this chapter.
KeywordsImpulse Response Magnitude Response Hanning Window Rectangular Window Transition Bandwidth
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