Originally Posted by mpgxsvcd
Yea I wrote that in too much of a hurry. TMT does pass through 96 Khz audio without downsampling or upsampling it. However, 48 Khz audio would be molested(upsampled).
As far as the other two points I believe that XP and Vista operate differently. Vista needs to operate in exclusive mode to have undownconverted audio. XP does not have an exclusive and non-exclusive mode like Vista. It always operates in exclusive mode.
Actually what is the difference between the application changing the volume and the operating changing the volume? Even in Exclusive mode with Vista you would be able to control the PCM volume with the computer right?
No, the whole point of exclusive mode is to bypass the windows mixer (molestation). If you can play other sounds & control the volume it means windows is touching the sound, it is matching the bit rate/resolution/volume etc. so different sounds can be output together at the same time. Basically it doesn't matter who touches the sound, tmt, windows or both, the sound is not pure.
To give you an example when you play dd/dts that's untouched. Windows/tmt have no control on bit depth/resolution/volume etc. What goes in comes out bit perfect.
In xp & vista you can use foobar2000 to get bit perfect sound for cds. You can even encode your blu-ray tracks to flac & use foobar2000 to play them, again bit perfect. It doesn't matter which mode you are using (asio/kernel streaming for xp or exclusive mode for vista) the end result is untouched sound whatever it is called.
When I play a cd in foobar2000 even if I have windows set as 5.1 48Khz, immediately after hitting play my receiver switches to 44.1Khz 2.0, the windows volume does nothing to the sound and all other devices are muted, just like when watching dd/dts. This output is bit perfect and matches that of a standalone unit bit for bit.
Now in an ideal world tmt/pdvd/windvd would use exclusive mode and output mlpcm as mlpcm, decode internally dts-hd ma/truhd and output as mlpcm. Basically what ps3 is doing. The sound would be bit-perfect in all formats and you wouldn't need hdmi 1.3 gfx/igp/audio card and an hdmi 1.3 receiver to enjoy the best formats natively.
Unfortunately we have to put up with crap like expensive hdmi 1.3 receivers/audio cards/mobos/specialized software/pap/pvap/etc. just to get what is possible with just an inexpensive hdmi 1.1 receiver & mlpcm igp or gfx.