Overlap add and Overlap save method are algorithms for decreasing the delay and hence it is used for large input signals.In these methods the decomposed length is specified of the input as well as the output signal.It therefore filters long data sequence and reduces the complication.In OAM zeros are added as per the length of the decomposed signal and is divided into N number of short length signals. In OSM the decomposed signal of the first short length consists of zero, since the second signal consists the first signal as well, it saves the data.
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In OSM, aliasing is present in first M-1 samples whereas no aliasing effect is present in OAM.
ReplyDeleteNice point Aishwarya. Thanks for adding it.
DeleteThe delay gets reduced as the whole input sequence is not needed at an instance to get the output
ReplyDeleteOAM and OSM are efficient ways to calculate convolution between very long signal x[n] and finite impulse response h[n].
ReplyDeleteOAM and OSM methods are used wherever the whole input signal has not been given but computations of the already stored signals are to be done.
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ReplyDeleteEven though these methods have many advantages, but the most important application is that it can be used for real time signal processing.
ReplyDeleteYes but only when FIR filters are used.
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