Filter Types
x(i)
z -1
z -M
z -1
z -M
z -1
z -M
h 0
h 1
h 2
h 3
z -1
h 4
h 5
h 6
h 7
z -1
h 8
h 9
h 10
h 11
z -1
h 12
h 13
h 14
h 15
Accumulator
y(i)
Figure 5 · 16 TAP Polyphase Decimation Filter, M = 4
Figure 5 shows an example of the polyphase decimation filter structure for a number of taps TAPS = 16 and
a decimation factor M = 4. A decimated output sample is obtained at the accumulator. A valid output is
available only at every M
th
clock. The decimator contains distributed coefficient ROM, one storage per
physical filter tap. In Figure 5, the first storage keeps coefficients h 0 to h 3 , the second storage keeps
coefficients h 4 to h 7 , and so on.
CoreFIR v8.5 Handbook
11
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