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Which among the following operation employs heuristic rules in computational auditory scene analysis?

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Which among the following operation employs heuristic rules in computational auditory scene analysis?

(a) Re-synthesis

(b) Source extraction

(c) Segmentation

(d) Grouping

I got this question during an interview.

Origin of the question is Next Generation Wireless Network topic in chapter Next Generation Wireless Network of Cognitive Radio

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The correct answer is (b) Source extraction

For explanation I would say: Computation auditory scene analysis applies heuristic grouping rules developed using psychological observations to separate a source from a single channel of audio. It separates the sound into music, voice, noise, etc.

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