Negative frequencies

  • Thread starter Niles
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  • #1
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Main Question or Discussion Point

Hi

Say I have a real quantity given by

[tex]
x(t) = \int_{ - \infty }^\infty {\tilde x(\omega )e^{ - i\omega t} d\omega }
[/tex]

Now I complex conjugate it (remember it is real)

[tex]
x(t) = \int_{ - \infty }^\infty {\tilde x^* (\omega )e^{ + i\omega t} d\omega }
[/tex]

How is it that I from this can conclude that we must have the relation

[tex]
{\tilde x^* (\omega )} = {\tilde x(-\omega )}
[/tex]
?

Best,
Niles.
 

Answers and Replies

  • #2
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I figured it out. Just make a substitution, and it all becomes obvious.
 

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