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Unformatted text preview: ENEE630 ADSP RECITATION 4 w/ solution October 1/2, 2009 1. Find the efficient structure for fractional decimation in Fig. R4.1, with H ( z ) = 10 X n =0 nz n . Please first apply the Type 1 polyphase decomposition. Illustrate your implementation. Figure R4.1: Solution: The intermediate block diagram is shown in the left figure, and the final result is on the right. The polyphase components are as follows, E ( z ) = 3 z 1 + 6 z 2 + 9 z 3 ,E 1 ( z ) = 1 + 4 z 1 + 7 z 2 + 10 z 3 ,E 2 ( z ) = 2 + 5 z 1 + 8 z 2 . E 00 ( z ) = 3 + 9 z 1 ,E 01 ( z ) = 6 z 1 ,E 10 ( z ) = 4 + 10 z 1 ,E 11 ( z ) = 1 + 7 z 1 ,E 20 ( z ) = 5 z 1 ,E 21 ( z ) = 2 + 8 z 1 . Note: For this problem, the solution is not unique. For instance, in recitation we used the trick z 2 = z 4 z 6 when dealing with the third branch. However, since z 2 can directly interchange the order with the upsampler, the following intermediate block diagram is also correct....
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This note was uploaded on 10/31/2010 for the course EE 630 taught by Professor Wu during the Spring '10 term at Aarhus Universitet, Aarhus.
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