How can write a function DFT(x) (in terms of jw) such that for the given discrete signal x[n]: >

creating function matlab code

Walter Roberson 2018 年 5 月 18 日

What is w in this context?

Walter Roberson 2018 年 5 月 18 日

Is x[n] intended to indicate x multiplied by floor(n)? Because if it is intended to indicate indexing then you cannot index at infinity.

geometry geometry 2018 年 5 月 18 日

編集済み: geometry geometry 2018 年 5 月 18 日

no x[n] is a discrete type signal. and DFT is the Fourier transform of x[n]. (w is frequency variable)

Guillaume 2018 年 5 月 18 日

A discrete transform is by definition over a finite discrete domain, not -∞, +∞.

The discrete fourier transform is the fft function in matlab. Is that what you're asking?

geometry geometry 2018 年 5 月 18 日

I don't want to use fft. the signal x[n] is zero for large n. (for example we can assume that x[n]=0 for n<-100 and n>100).

the result of DFT should be in terms of w.

Guillaume 2018 年 5 月 18 日

I think you need to explain in a lot more details what it is you're after. Perhaps, give some concrete examples.

I don't want to use fft. Why not? This gives you the frequencies (ω) of your discrete signal.

geometry geometry 2018 年 5 月 18 日

I'm going to plot DFT.

Because my project says to do it without using fft.