graph shows 320 kbps LAME 'never achieves transparency'?
Reply #4 –
IMO, this graph is not evidence that 320 'never achieves transparency'.
Completely agree. The graph is missing at least 4 important things:
- Confidence intervals around all data points
- Mean and confidence interval of the hidden reference, since most of the time that reference does not end up getting quality 10!
- a description of what exactly is meant by "perceived listening quality", i.e. the y-axis label
- a description of the test material used to obtain those quality results.
[quote author=[JAZ] link=msg=0 date=]As such, quality can't be 100% with any setting.[/quote]
Why not? Full perceptual transparency for every listener in the universe implies 100% quality.
[quote author=[JAZ] link=msg=0 date=]If you want to add there the transparency point, it would be somewhere around 8...[/quote]
Why? Or rather, were did you read that? In MUSHRA tests, 80% and above means "excellent/broadcast quality". Transparency, though, is when the confidence intervals of a codec and the hidden reference overlap. That's the reason why the hidden reference is needed in that plot.
Chris