Write a SCILAB program for computing short term energy using frame sizes of 100,200 & 500 msec and all with a frame shift of  one sample. Compare the reults with the case of 30,50 & 100 msec case given in the procedure, Write down the observation using a rectangular window. 

Modify the above program  for the case of hamming window. write down your observation.

Modify the short term ZCR program by not including the factor "N"(frame length) in the relation.Compute the ST ZCR for window size of 30,50 & 100 msec. compare the same with the earlier case given in the procedure section. Do you find any difference ? comment.

Write  the pitrch estimation program in SCILAB using frame sizes of 10,50 & 100 msec, each with a shift of 10 msec . Compare the nature of plots in three different cases & comment.