Overlap Add method and Overlap Save method
FFT is known for its fast computational applications one of which includes fast convolution of signals than the usual direct method.Overlap Add and Overlap Save are the two block processing techniques used for fast convolution.Here the zeros are appended to the signal or filter sequence until the input signals are of equal length.
In OAM, the output of a long sequence can be calculated
by simply summing the outputs of each block of the input. Here the output is such that overlapping takes place in the tail of the output from the previous block and the beginning of the output from the present block.
In OSM, instead of sectioning the input and then calculating
the output, we decompose the input by adding some preceeding values to each of the input to make it equivalent to L = length of x[n] and then do circular convolution with h[N] and finally eliminate the zero padded values from each convoluted output.
Which one is better OAM or OSM?
ReplyDeleteOSM is better because it uses less memory.
DeleteWhere do we find OAM and OSM applications ?
ReplyDeleteOAM and OSM are used in filtering of long data sequences.
Deletegood content
ReplyDeleteThanks.
DeleteWhich uses less memory?
ReplyDeleteIn case of OAM, we have to store the values of each of the output signal of the blocks, we needn't save the same for OSM. So OSM uses less memory.
ReplyDeleteWhy is it called block transfer technique?
ReplyDelete