confused about complex signal

On Dec 14, 7:36�pm, buleg...@columbus.rr.com wrote:
> On Dec 14, 9:12�am, communications_engin...@yahoo.com wrote:
>
>
>
> > BUT do negative frequency means the orientation of the sinusoid (for
> > e.g) right? Correct me if I'm wrong ... Also what is the practical
> > significance of using an imaginary component when we are dealing with
> > a quadrature composite signal. If I may also ask does 'j' represent
> > orthonormal signals ?- Hide quoted text -
>
> > - Show quoted text -
>
> Negative frequency is really only relevent in the complex domain. �A
> sinusoidal signal is comprised of two phasors: A negative frequency
> phasor, and a positive frequency phasor. �Thes two complex
> exponentials add up to make a real sinusoid.
>
> I have built some flash programs that illustrate how phasors add up to
> make sinusoids:
>
> http://www.fourier-series.com/fourierseries2/complex_tutorial.html
>
> You want to work with complex numbers because you don;t really
> understand how sinusoidal motion (as a solution to a differential
> equation) makes sense, until you can see the complex exponentials.

Yup, I visited your site, the flash programs are very informative.