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In which of the following methods, the output sequence is considered as shown in the below diagram?

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In which of the following methods, the output sequence is considered as shown in the below diagram?

(a) Overlap save method

(b) Overlap add method

(c) Overlap add & save method

(d) None of the mentioned

The question was asked by my school principal while I was bunking the class.

The above asked question is from Linear Filtering Methods Based on DFT topic in chapter Discrete Fourier Transform – Properties and Applications of Digital Signal Processing

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Right choice is (b) Overlap add method

The explanation: From the figure given, it is clear that the last M-1 points of the first sequence and the first M-1 points of the next sequence are added and nothing is discarded because there is no aliasing in the input sequence. This is same as in the case of Overlap add method.

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