In this experiment,first a 4 point sequence was taken and it's DFT was found out using C program.Then this same sequence was appended by 4 zeros to form a 8 point sequence and further 4 point sequence was expanded by adding alternate zeros between two samples.It's DFT output was found out using C code of DFT. Magnitude spectrums were plotted for each case.As value of N increases, frequency spacing and approximation error decreases as well as resolution of the spectra increases.Expansion of signal in time domain giver compressed spectrum in frequency domain.
dft is freq sampling of dtft signal
ReplyDeleteDFT requires maximum calculation
ReplyDeleteDFT is slower than FFT
ReplyDeletewhy is FFT faster?
ReplyDeleteDFT is said to be a frequency domain representation of the original input sequence
ReplyDeleteDFT is serial processing technique and hence can be used for real time signal processing applications
ReplyDelete