
Filtering and sampling 16
My explanation describes the
original sampling of an analog
signal waveform. If you are more
comfortable remaining in the
digital domain, consider the
problem of shrinking a row of
image samples by a factor of n
(say, n = 16) to accomplish image
resizing. You need to compute
one output sample for each set of
n input samples. This is the
resam-
piing
problem in the digital
domain. Its constraints are very
similar to the constraints of orig-
inal sampling of an analog signal.
This chapter explains how a one-dimensional signal is
filtered and sampled prior to A-to-D conversion, and
how it is reconstructed ...