Note 57. Polyphase Interpolators
A1-to-L interpolator can be implemented using the polyphase structure shown in Figure 57.1. If h[n] is the response for the interpolation filter when implemented in one of the conventional single-stage structures presented in Note 32, then each individual pρ[n] in Figure 57.1 is a different down sampled version of h[n] obtained as
57.1
for
n = 0, 1, 2,..., (N/L –1)
ρ = 0, 1, 2,...,(L – 1)
Figure 57.1. A 1-to-L interpolator implemented using a polyphase structure with a commutator
57.1. Why It Works
Consider ...
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