WIGsignalsFULL.mp4: Wigner-Ville Time-Frequency Distribution 
  of a signal that consists of:
 (1) two slighly different Gabor atoms  whose internal frequencies 
 progressively increase, .
 (2) A dirac, 
 (3) A sinusoid, 
 (4) A noise that increases for each repeated sequence. (23')
 
 In the Time-Frequency plane: [0,1] vs.[0,1]. 
 Observe the calculation interference terms.