Fig. 3

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Sketch of the SCARF time-frequency decomposition: the red block is the selected frequency segment on time bin , the candidates for time segments l – 1 are the ones with an upper bound among the green blocks, and the lower bound in the blue ones. The most powerful contiguous block are composed of elements that are each above threshold is selected as an active block on time segment l – 1 before moving back one time segment.
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