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:<math>\int_{-\infty}^\infty \int_{-\infty}^\infty |\chi(\tau,f)|^2 \, d\tau \,df=|\chi(0,0)|^2 = E^2</math>
(4) Modulation by a linear FM signal
: <math>\text{If } s(t) \rightarrow |\chi(\tau,f)| \text{ then }s(t) \exp[
(5) Frequency energy spectrum
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