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

[Ben Waggoner]

Ivan,
    Spot on, thanks.
    Given that the quality difference is so slight, why prediction anyway?
Ben Waggoner
Interframe Media <http://www.interframemedia.com>
Digital Video Compression Consulting, Training, and Encoding
on 11/8/01 9:39 PM, Ivan Dimkovic at admin   aac-tech.com wrote:
> 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,