Page 311 - Phase-Locked Loops Design, Simulation, and Applications
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Figure 7.18 Upsampling a digital signal by zero padding and lowpass filtering. (a) The
original digital signal sampled at f = 1/T. (b) Zeroes are inserted between any two
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succeeding samples. (c) Lowpass filtering the zero-padded signal with cutoff
frequency f /2 yields the interpolated signal, upsampled to 4f .
S S
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