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Unformatted text preview: £ a b c a b c a b c a b c / T S 28.2 ( P 3.27 in textbook). In MATLAB notation, consider the 4-point vector s = [a b c d].’ and its zero-padded extension x = [s ; zeros(12,1)] Let X denote the DFT of x . Express the DFT’s of the following vectors using the entries of X : x1 = s x2 = [ s ; s ] x3 = [ s ; s ; s ; s ; s ] % length=20 x4 = [ s ; z4 ] x5 = [ z4 ; s ] x6 = [ s ; z4 ; s ; z4 ] x7 = [ s ; s ; z4 ; z4 ] where z4 = zeros(4,1) ....
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