[M4IF Technotes] AAC: PNS scale factors

[John Cox]

Hi
The standard says (ISO/IEC 14496-3:2001(E); 4.6.13.3 page 174) that the
initial scale factor for PNS values is:
scale = 1/(size * sqrt(MEAN_NRG));
however the reference software from the ISO site (both refSoft &
rewrite) seems to calculate it as:
scale = 1/sqrt(size * MEAN_NRG));
Which is "correct" and what have other people done?
I've found the PNS reference streams AL18*.mp4 & AL19*.mp4 (though not
AL09,10,11) but no corresponding .wavs to check against - do they exist
anywhere?
Many thanks
John Cox
SJ Consulting