After realizing the usefulness of FFT algorithm, it is necessary to understand its implementation in practical systems for faster and smarter(less calculative) operation. In real-time environment the long and indefinite length signals (unlike FFT) . To ensure proper analysis two methods: Overlap Add Method(OAM) and Overlap Save Method(OSM) are used. In both these methods the samples are divided into groups of samples such that the output of convolution of each group and the system function will have length equal to 2^N where N is an integer. To evaluate OAM and OSM in time domain Linear and Circular Convolution is used respectively. At times circular convolution is faster and hence, OSM can perform better.
Why is it called as block transfer technique?
ReplyDeleteHere, from the input samples, only a block of samples(each block can contain many samples) are processed at a time.
DeleteHowever,care must be taken to ensure parallel processing in order to reduce computation time.
OSM is the more preferred method in real-time applications
ReplyDeleteBecause of circular convolution.
DeleteHowever, OAM has less computations
ReplyDeleteThat depends on the hardware and on the sampled the signal itself.
DeleteOSM is faster than OAM as it uses circular convolution
ReplyDeletethis is a block processing technique
ReplyDeleteHence,it is used for practical purposes.
DeleteThese are block processing Techniques
ReplyDeleteHence they are preferred.
DeleteThese methods are preferred instead of long-point FFT implementation.
ReplyDeleteThese methods are used because of better feasibility.
DeleteOSM is used in practical applications.
ReplyDeleteYes because of circular convolution.
DeleteIn OSM, aliasing effect is present but is absent for OAM.
ReplyDeleteThs is because of the extra elements that are saved.
DeleteOSM and OAM are used for large sequence of input data.
ReplyDeleteTrue.
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