On 1/15/2012 9:33 AM, SMS wrote:
If you look at table 5.2.1 at
http://www.nrscstandards.org/DRB/Non-NRSC%20reports/NPRmultiple_bit_rate_report.pdf
you can actually learn where listeners begin to not like the audio quality.

If you look at section 2.2 of that paper you'll find that Ibiquity
controlled the audio samples used in that test. The "digital" signal
fed to the participants was the output of a CD player with the level
carefully controlled and run through the Ibiquity codec with no other
audio processing whatsoever. The "analog" signal was run through an
Omnia 6EX and an Optimod 8400 where it was compressed (in the analog
domain, I'm speaking of now).


Is it any wonder that people felt the HD signal had superior audio
quality? Things don't sound so good when you squash the dynamic range.
So this is just a classic case of the fox guarding the henhouse, isn't it.

Dave B.