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What is differences between overlap-save and overlap-add methods.

written 2.0 years ago by prajapatijaimin • 3.2k

•   modified 2.0 years ago

discrete time signal processing

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written 2.0 years ago by prajapatijaimin • 3.2k

Solution:

Overlap-save method	Overlap-add method
In this method the size of the input data block is N=L+M-1	In this method the size of the input data block is L
Each data block consists of the last M-1 data points of the previous data block followed by L new data points	Each data block is L points and we append M-1 zeros to compute N point DFT
In each output block M-1 points are corrupted due to aliasing as circular convolution is employed	In this no corruption due to aliasing as linear convolution is performed using circular convolution
To form the output sequence the first M-1 data points are discarded in each output block and the remaining data are fitted together	To form the output sequence the last M-1 points from each output block is added to the first M-1 points of the succeeding block

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