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1. Definitions and measurement principles
1.1 Definition of a signal
An ideal sinusoidal signal (carrier wave), ν(t) = A.sin(2πft), has a constant frequency as a function of time, f = f 0 = constant. This means that the phase of the signal increases linearly with time:
The average frequency of a continuous periodic signal over a certain measurement time is defined below, and is illustrated in figure...
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