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8.7 FFT Analysis Function
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8.7.9 Cross Correlation [CCR]
Function
Rab (τ) =
-1
(Gab)
= Gab･(ω)exp(jωτ)dω
Horizontal
cursor
Vertical
cursor
Stored waveform (input waveform) Stored waveform (output waveform)
Cross correlation function
08-54, 55,56
Displays the degree of similarity between two points separated by a time
difference (τ) on two signals.
The degree of similarity is expressed as a function of the time difference
(τ).
Major applications:
･ Obtaining the phase difference between two signals in time units.
･ Obtaining a speed or distance by measuring the time delay.
Time Time display. The center indicates the reference (τ=0), the
right side indicates time lag (+τ), and the left side indicates
time lead (-τ).
Linear Readings are from +1 to -1 (no units).
+1: the highest similarity between the input and output signals
for time differentialτ, 0: the lowest similarity, -1: the polarity
is completely opposite
Example Cross correlation function waveforms
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