[Mp4-tech] AAC - PNS - Testing

[Kannan GS Nambiar]

Hi All,
I would like to get some info regarding the tradeoff between Utilization and
processor power required for Perceptual Noise Substitution (PNS) as used in
MPEG 4 AAC.Here by  Utilization I mean the Quality improvement of audio by
using PNS.
I would also like to get some info on testing PNS.In case testing is going
to take more time for the probable quality addition, I was wondering whether
I can opt out of using PNS.Is there a correct way of generating the Random
numbers,or can we define our own method???There was no mention to be seen
regarding this in the standard. 
Thanks and Regards,
Kannan
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