The aim of this experiment was to perform filtering of long data sequence using Overlap Add Method(OAM) and Overlap Save Method(OSM). These methods are used to find discrete convolution i.e. output of FIR filter for a very long input signal x(n).
OAM and OSM divides the input sequence into smaller blocks. The filtering of individual blocks, which are smaller in length, is done by DFT and IDFT and then fitted one after the other. The overlapped portion is discarded in OSM whereas it is added in OAM to get the required output sequence. Thus, OAM and OSM are block processing techniques.
They are suitable for real time signal processing. They are used for decreasing the delay obtained in getting the output.
Convolution of the entire input signal at a time will be a time consuming procedure.
ReplyDeleteWhat are the advantages of OAM and OSM?
ReplyDeleteThe main advantage of these techniques is that samples of output will be available real time on a block by block basis. Also these methods decrease the delay obtained in getting the output.
DeleteOAM and OSM are used for finding output of digital fir filter
ReplyDeleteThese can be used for real time signal processing
ReplyDeleteProcessing is faster because of use of FFT for OAM and OSM
ReplyDeletecannot be used for IIR filters
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ReplyDeleteThis is called a block processing technique.
ReplyDeleteThey are preferred over FFT as FFT requires parallel input and real signal in sequential.
ReplyDelete