-----
The traditional argument for N3D against SN3D is that N3D would force the
omni (W) channel down because the higher order signals have higher gain,
and that would reduce the available dynamic range.
That is true for a single encoded source, but not for a complex mix of
sources in all directions. And if you think about the gain structure of
a complete system (including decoding to speaker signals), that is how
it should be: a single source will be reproduced by only a few speakers,
so it can never have the same SPL as a complex surround signal at maximum
level. Since W represents the mono mix, its maximum level for a single
source *should* be lower. So the rational choice would be N3D. In order
to obtain the same headroom using SN3D, the overall level must be lower,
with additional gain at the receiving end to compensate. This completely
negates any S/N advantage that SN3D is supposed to have.
I actually mentioned this in the meetings that resulted in the Ambix
format, but lost the vote.
- - -
No, you did not lose all the vote 😉:
https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.2094-1-201706-I!!PDF-E.pdf
Table 3 - 7...
Best,
Stefan
- - - -
Ciao,
--
FA
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