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EE 200
Sampling
In order for digital hardware to operate on a continuous
signal, the signal must first be changed into a discrete
signal.
The action of changing the continuous signal
into a discrete signals is known as sampling.
The time span between samples,
T
, the called the
sampling interval.
Sampler
T
Input signal
Real
→
Complex
Output signal
Integer
→
Complex
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EE 200
Sampling
For a temporal signal, the sampling interval is specified
in units of time (e.g. 4 microseconds per sample).
The inverse of the sampling interval is the sampling
frequency.
The
f
s
value is sometimes just specified in Hertz.
f
s
=
1
T
samples/sec
"
s
=
2
#
T
radians/sec
3
EE 200
Sampling
For a spatial signal, the sampling interval is in units of
distance between each sample (e.g. 2mm/sample).
The sampling frequency for sampling a spatial signal is
the inverse of the sampling interval and is in units of
samples /distance.
For example, an image scanner samples a continuous
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This note was uploaded on 12/03/2008 for the course EE 200 taught by Professor Zadeh during the Fall '08 term at USC.
 Fall '08
 ZADEH

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