• Signal = sum of sinusoïds, amplitudes and frequencies vary

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• Standard analysis : Spectrogram , constant amplitude and frequency

..
• Problem:

.

 
 
 

Spectrogram, long window
 
 

Spectrogram, short window
 
 

Spectrogram, demodulated signal (constant null frequency):

 
 
 
 
 

3. Example

  sakuhashi  Original
  sakuhashi  Sinusoidal Partials
  sakuhashi  Residual

Example  2

  sakuhashi  Original
  sakuhashi  Sinusoidal Partials
  sakuhashi  Residual