envelope curve การใช้

• Sifting scheme for pseudo-BEMD is like the 1D sifting where the local mean of the standard EMD is replaced by the mean of multivariate envelope curves.
• In order to increase the contrast between the note groups, a set of six envelope curves was added : steady amplitude, increasing amplitude to a sudden cut-off at the specified maximum, and a gradual decrease from the specified maximum; each of these occurs with and without reverberation to produce six forms in all.