Digital Signal Processing Reference
In-Depth Information
The problem of filling the gaps between nonzero samples in an upsam-
pled sequence is, in many ways, similar to the discrete- to continuous-time
interpolation problem of Section 9.4, except that now we are operating en-
tirely in discrete-time. If we adapt the interpolation schemes that we have
already studied, we can describe the following cases:
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Figure 11.13
Upsampling by 4 in the time domain; original signal (top panel); por-
tion of the upsampled signal (second panel); interpolated signal with zero- and
first-order interpolators (third and fourth panels).
