[M4IF Technotes] AAC: PNS scale factors

[Eddie Choy]

Dear John,
I don't have an answer to your first question.  But for the reference wav 
files, you can fetch them from:
ftp://mpaudconf:adif2mp4@ftp.iis.fhg.de/guests/mpeg4audio/incoming/testSequences/mpeg4audio-conformance/referencesWav/
Regards,
Eddie
At 04:09 PM 6/18/2003 +0100, John Cox wrote:
>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
>
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