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SPDIF to Dolby Digital Receiver

W

WooDaddy

Senior member
It seems that there are more and more soundcard that have coax or optical SPDIF outputs. If you have a compatible 5.1, 6.1, 7.1, n.1 computer speaker set, I'm assuming that it decodes this audio data appropiately. Question is, what standard is it and is it compatible with AC-3 Dolby digital formats (5.1, 5.1DTS, 6.1, etc)? I would love to be able to connect my SPDIF output directly to my receiver and know it's interpreting it correctly.
 
yes, you can do that, just don't let your sound card do the decoding and let your receiver do it. There are options for this.
 
I am not sure what it is but I use a cambridge soundworks dtt2500 dolby digital decoder and the realtek spdif out on my msi k8n neo2 platinum nforce3 ultra if thats any help.
I dont if it is working correctly or not only that it sounds okay. Not thrilled with the sound and will probably upgrade to a professional card. i will also replace the doecoder as well.
 
EASY you need 2 things to make it happen
(1) a sound card with SPDIF
(2) AC3Filters.ax - direct show filters

If you just hookup the soundcard to receiver, you will only get 2 Speaker sounds
even when you watch DVD movie. To enjoy the 5.1 surround/ DTS tracks,
you need to enable "AC3 PASS-THROUGH".

Translation: dump the digital signal to the receiver without mixing by the soundcard or
processing by the CPU. Without the Pass-through, your receiver is just a simple 2 speaker
surround.

 
Translation: It will work just enable pass through. The audigy has a option for it, I don't know about the rest but I am sure they do
 
If you are using the digital out (and dont have a soundstorm) you will only get 5.1 from a existing 5.1 stream (DVD movie) Games will be stereo.
 
that is true. Unless the audio is already encoded(movies) the receiver will only get a stereo signal. For that matter ANY speaker system hooked up via a digital connection will only have stereo playback(unless you are watching a DD encoded soundtrack). Analog sent to your receiver via 5.1 analog connections will allow for surround sound from any source that has the capabilities.
 
When the stereo signal gets to your receiver though, you can let the receiver play it to all speakers.

For example, most receivers with have a 5, 6, or 7 channel stereo mode (called party mode sometimes) which will play the right stereo signal on each right speakers and left on the lefts side of the room with the center getting a mix.

In addition to just stereo, I can play Dolby Pro Logic or Pro Logic II and have it map to 5.1 (this time it's more emphasis on the front speakers with less coming from the back)

Also, DTS Neo 6 can also take the stereo signal and map it to 5.1 6.1 or 7.1. Basically same as what Pro Logic is doing (taking a stereo signal and giving most of it to the mains and then picking out some of it to go to surrounds)

I like Logic 7 the best on my HK receiver. Again, going basically the same as the others.


So, I use Logic 7 when there's just a stereo signal playing, but when something like a movie is encoded with DD, the receiver detects the signal as such and plays it back in Dolby Digital EX mode.
 
Usually your DVD software will have an option in the audio setuo to enable the SPDIF passthrough. In the version of WinDVD I'm using, you have to check the box nect to "S/PDIF out to external processor" to enable the pass-through.
 
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