Digital procedure for smoothing out noise
Assumes that signal varies slowly
Assumes that the average of several points is a better
representative than any single point
Essentially take anywhere between 2 and 50 points and average
together to replace a point
Some detail is lost in this process
Not good for rapidly changing signals
Can be done via computer
Or via a hardware device called a boxcar integrator
Time over the average is called the aperture time
Same sqrt(N) S/N improvement as in ensemble averaging