89
The two signals have the same amplitude if the frequency or phase difference of the
two measured signals is integer multiples of pi/4. The Lissajous pattern of the special
signals is shown in figure 3-4, wherein m:n is a frequency ratio, K represents a phase
difference coefficient, and theta=K x pi/4. Figure 2-49 is a measured Lissajous pattern
when the two signals have the same frequency and amplitude and the phase difference
is pi/2.
Figure 3-4 Special Lissajous pattern
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