Overlap Add Method & Overlap Save Method

In a Digital FIR filter if the input sequence is long we use Overlap Add and Overlap Save Method. The input sequence is broken into shorter blocks and the output is computed block by block using convolution.
In OAM since convolution is linear, the output of a long sequence can be calculated by summing the outputs of each block of the input. The tail of the output from the previous block is overlapped with the beginning of the output from the present block.
In OSM the last part of the previous input block is used as the beginning of the next block and the overlapping portion of the output blocks are discarded.

 Originally posted at: https://chaitanya33.wordpress.com/2017/03/14/overlap-add-method-overlap-save-method/

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