DTS-X is based upon an open object codec that SRS labs developed and open
sourced, the decoder is a proprietary implementation but anyone can make
their own decoder. DTS acquired SRS labs to get the technology, it is superior
to Dolby Atmos and is scale-able from bin-aural headphones all the way to 64
channels. Even Dialog can be a separate object, so you can turn up dialog, but
not the rest of center channel info, or even have a left and right center
channel so when 2 people are on screen their voices come from their side of the
screen! All of this with no changes to the mix just like Ambisonics, speaker
layout is configurable in the decoder. Has anyone here tried converting
B-format to DTS-X or Dolby Atmos? Also all a/d converters are essential DSD
bit-stream with decimation filters added on to produce PCM. I much prefer the
sound of DSD recorded, processed and mixed in DSD, without any PCM conversion.
It simply sounds better than any PCM I have heard. I would be curios to hear
b-format done entirely in DSD. Thanks in advance. Chris Boozer
On Thursday, April 21, 2016 9:45 AM, Aaron Heller <hel...@ai.sri.com> wrote:
On Thu, Apr 21, 2016 at 12:14 AM, Trond Lossius <trond.loss...@bek.no>
wrote:
> > On 20 Apr 2016, at 21:16, Marc Lavallee <m...@hacklava.net> wrote:
> >
> > I wonder why using uncompressed PCM instead of compressed AAC...
>
> Is there a risk of compressed audio altering the phase between the
> channels, affecting the spatial image?
>
Marc and I looked at this informally when he was developing ambisonic.xyz.
We took panned first-order B-format (e.g., AJH-eight-positions.amb),
though an encode/decode cycle with candidate codecs, and then looked at the
spatial spreading of energy with a simple parametric decoder. No listening
tests, just visual comparison of plots of spatial energy.
We found very little spreading with low-complexity AAC, but a fair amount
with HE-AAC.
Aaron Heller (hel...@ai.sri.com)
Menlo Park, CA US
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