[M4IF Technotes] What's low complexity about AAC LC

[Ivan Dimkovic]

Dear Ben, others,
> Folks,
>
>     So, what is low complexity abut AAC LC?  Only two channels?  No PNS
> tool?

AAC Low Complexity profile differs from higher complexity profiles in:
1. No Prediction is used (prediction in main profile consumes many CPU
cycles)
2. tns_max_order is lower (lower order of TNS filtering, less CPU cycles
required)
The biggest difference between LC and, for example, Main and LTP profiles is
the lack of prediction. This leads to reduced complexity of the decoder (and
partially of the encoder). Despite the fact that prediction is not used, LC
profile performs quite similar to Main profile in quality terms. Quality
difference between these two profiles is very small (much smaller than the
diffrerence in the decoding complexity)
I hope this helps,
*************************************************
Ivan Dimkovic, Technical Manager
PsyTEL Research
Multimedia Coding Solutions
Belgrade Yugoslavia
phone:  +381 64 11 40 600
fax:    +381 11 32 25 275
email:  dim   psytel-research.co.yu
www:  http://www.psytel-research.co.yu
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