We want to compute an Npoint DFT of a onesecondduration comp
     We want to compute an N-point DFT of a one-second-duration compact disc (CD) audio signal x(n), whose sample rate is f_s = 44.1 kHz, with a DFT sample spacing of 1 Hz.  What is the number of necessary x(n) time samples, N?  What is the time duration of the x(n) sequence measured in seconds?   
  
  Solution
A) No. of samples = sample spacing/space rate
 = 44.1 *1000
 = 44100
 b) time duration appeared to be measured = 1/44.1
 = 0.027 ms

