The invention can optimize the trade off in {HEAD ~ transform coders} between {TAIL ~ time resolution and frequency resolution} by adaptively selecting the transform block length for each sampled audio segment, and can optimize coding gain by adaptively selecting the transform and by adaptively selecting the analysis window or the analysis/synthesis window pair 
between
The invention can optimize the trade off in { HEAD ~ transform coders } between { TAIL ~ time resolution and frequency resolution } by adaptively selecting the transform block length for each sampled audio segment , and can optimize coding gain by adaptively selecting the transform and by adaptively selecting the analysis window or the analysis / synthesis window pair
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