Root Mean Square (rms)
This is the square root of sum of squares of individual observations divided by the total number of observations made.
The r.m.s. value of a function, x(t), over a time interval between t1 and t2 is specified by the following formula:
Because energy varies as the square of amplitude, rms tracks the amount of energy in a complex signal. In noise data, the rms value should be approximately the same as the standard deviation.
The simple 3 step process to calculate the RMS is:
- square all the individual entries
- average the numbers you get
- take the square-root of that average
Overall RMS Level
A measure of the total RMS magnitude within a specified frequency range.
See also: Crest Factor.
Subjects: Signal Processing