Hi all
If we consider a periodic rectangular pulse train, to find its frequency spectrum, we can find its fourier coefficients; since it is made up of sine and cosine, we expect the spectrum to be discrete.
However if we choose to represent this pulse as an infinite sum of time shifted rect functions, applying Fourier transform and applying the time shifting property, we will end up with a summation of sinc * e^jwt terms which are clearly continuous.
My question is that for the same signal why would there be 2 totally different spectrums? What did I so wrongly?
Many thanks!
If we consider a periodic rectangular pulse train, to find its frequency spectrum, we can find its fourier coefficients; since it is made up of sine and cosine, we expect the spectrum to be discrete.
However if we choose to represent this pulse as an infinite sum of time shifted rect functions, applying Fourier transform and applying the time shifting property, we will end up with a summation of sinc * e^jwt terms which are clearly continuous.
My question is that for the same signal why would there be 2 totally different spectrums? What did I so wrongly?
Many thanks!