[opus] Opus quality vs bit rate graph

[Brent Kimberley]

Hi I was just looking at your Opus quality vs bit rate graph.  Latency looks good.  
 
Two questions:
1/ Wideband: How did you address channel separation (i.e. What is the interaural time difference (ITD) granularity/resolution in microseconds?  - assuming two channels. )
 
2/ Narrowband: I see AMR-NB.  How does Opus compare with modern speach coding and band excitation models?
I.e. http://www.opus-codec.org/comparison/ : http://www.opus-codec.org/comparison/quality.png
 
http://www.dvsinc.com/papers/iambe.htm
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