derivative of speech signal

how to find derivative of a speech signal in matlab

[Primi]

plz someone help me...is der a fn to find the derivative of a speech signal in matlab.?

[Zhang lu]

Hi do you mean 'diff()' function ?

[Jan]

An answer might depend on what "derivative" exactly means here. Perhaps you are searching for the gradient command?

Answer 1

[Youssef Khmou]

hi, try :

 load gong.mat;
 dy=diff(y);
 dy(end+1)=dy(end);
 figure, plot(y), hold on, plot(dy,'r'), hold off