How does frequency spectrum work?

[mani_sohail]

Frequency Spectrum

can any one tell me about the frequency spectrum.how it works?

 

[SkyHigh]

Re: Frequency Spectrum

Frequency spectrum is the spectrum of all frequencies that synthesised or composed the complex signal.

Many people confused frequency spectrum with electromagnetic spectrum.

Frequency spectrum of a signal is analysed using a spectrum analyser, such as ones from HP-Agilent.

 

[magnetra]

Re: Frequency Spectrum

From Fourier Theory, we know, any signal ( with complex waveform) can be seen to be composed of sinusoidal waves of different frequencies called harmonic components.
Frequency spectrum is the representation harmonic composition of a signal.

Regds
magnetra

 

[ysenthilece]

Re: Frequency Spectrum

any signal can be represented as weighted sums of sinusoids(shifted if necessary)....
sinusoid is chosen in particular because it has some amazing properties....All linear
operations(addition , multiplication , differentiation , integration ,etc) on a sine function results in another sine function ( shifted or scaled,etc)...so now wat happens is tat
all the complex operations like differentiation ,etc just reduced to addition ,etc..
It even becomes simple when u change sin(w*t)---> Real part of { exp(jwt) }.
So we just need to know wat will happen if a sinusoid of some frequency goes thro a system ..it will get shifted and scaled ..the former called phase and latter called magnitude...