Discrete Fourier Series question

[Ahmad Kishki]

Why is the summation for the discrete Fourier series from 0 to N-1 (where N is the fundamental period of the signal) wheras it goes from minus infiniti to infiniti for continuous Fourier series...Thank you

 

[ehild]

Why is the summation for the discrete Fourier series from 0 to N-1 (where N is the fundamental period of the signal) wheras it goes from minus infiniti to infiniti for continuous Fourier series...Thank you

The summation goes from n=0 to infinity in case of Fourier series in terms of sin(nx) and cos(nx). In terms of e^inx, it goes from - infinity to infinity.