[Mp4-tech] AAC Conformance accuracy

[Ralph Sperschneider]

Alfred wrote:
> Hi Ralph, 

Hi Alfred,
> 1) In MPEG-4, the conformance is done using rms
>  measurements also. In this the threshold is a
>  value dependent on the value K. Is the value equal to
> 16, for standard decoders that run  on handhelds ?

This might depend on the implementation. If nothing special is claimed one 
should expect that k=16.
> 2) TRegarding the reference software hosted in the ISO
> website -  Is it a floating point code or a fixed
> point code?  And what is te compliance accuracy i.e.
> What is the value of K?

The reference software is implemented with floating point arithmetic. Since it 
is the reference software, it claims to produce reference waveforms. Comparing 
them to itself makes not that much sence.
> Jones

Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
Fraunhofer IIS                  | Fax:   +49 9131 776 398
Am Wolfsmantel 33               | mailto:ralph.sperschneider iis.fraunhofer.de
D 91058 Erlangen                | http://www.iis.fraunhofer.de/amm/