Overlap Add Method and Overlap Save Method
We use overlap add method(OAM) and overlap save method(OSM) when input signal x(n) is given to digital FIR filter.OAM and OSM are linear filtering methods.In this practical,a 13 point input sequence is taken and output is found out using C program using OAM and OSM for same input sequence.The outputs obtained using both the methods are same.
In OAM method,input sequence is decomposed and then linear convolution is performed on these signals individually.The outputs obtained are then combined together and displayed.In OSM the signals are decomposed and then circular convolution is performed.The input is decomposed in OSM in such a way that there are some value from previous sequence.The outputs obtained are then combined inbto a single sequence by removing the repeated number of values.In this practical,x(n) was a 13 point sequence and h(n) was 4 point sequence.
Where to ise this method?
ReplyDeleteThese methods can be used in FIR filters with long input sequence
ReplyDeleteFor FIR filter the impulse response h(n) is of finite length
ReplyDeleteThese are linear filtering methods
ReplyDeleteThese methods are used to find output of long input data sequence.
ReplyDeleteOSM and OAM methods are useful for long sequence input signal.
ReplyDeleteOAM and OSM are block processing techniques and are used in case of FIR filters when input sequence is very long.
ReplyDeleteOam osm can be used to find op of digital fir filter
ReplyDeleteThanks for sharing nice stuff . . read also about Fast fouriers transform
ReplyDelete