AC3 decode and send to outputs

pomFritz · Jun 10, 2009, 01:11 AM

Hello, I want to use 4 digital amplified speakers to play AC3.

I have :
- 4x speakers with S/PDIF inputs (with built-in amplifier)
- a sound blaster with 3x S/PDIF outputs (onboard, cabled and working)
- PowerDVD
- Vista

I want to decode AC3 that come from PowerDVD :
- AC3 front (+ Sub) -> 1 PCM stereo channel -> onboard S/PDIF output 0 -> Speakers 1+2
- AC3 rear -> 1 PCM stereo channel -> onboard S/PDIF output 1 -> Speakers 3+4

Any idea? I have tried kX modules, but I didn't find how to do.

Thanks

Russ · Jun 10, 2009, 11:20 PM

Hmm, I do not know whether kX supports AC3 decoding currently with Vista or not. In any case, you are probably better off just letting PowerDVD decode it, and then use kX DSP to do the routing.

pomFritz · Jun 12, 2009, 09:58 PM

OK it works

Settings are SPDIF only, 4.1 speakers and AC3 decoding. With PowerDVD I hear front, sub and center in front speakers (connected to onboard SPDIF0) and rear in rear speakers (connected to onboard SPDIF1).

I still have a pops problem that I think is related to some samples buffer size. i have created a new post for that.

Russ · Jun 12, 2009, 10:49 PM

Did you end up using kX or PowerDVD for the decoding?

pomFritz · Jun 13, 2009, 02:47 PM

I think PowerDVD sends the AC3 to the default Vista SPDIF/AC3 output (Dolby checked in Vista sound param) and kx decodes because I see the kx AC3 popup.

Russ · Jun 13, 2009, 04:29 PM

I was just curious because as I said before, I do not know whether kX's AC3 decoder is supported/works currently under Vista, so it is good to know that it is working for you, etc.

Jun 10, 2009, 01:11 AM	#1
pomFritz HardwareHeaven Junior Member Join Date: Oct 2008 Posts: 21 Rep Power: 0	AC3 decode and send to outputs Hello, I want to use 4 digital amplified speakers to play AC3. I have : - 4x speakers with S/PDIF inputs (with built-in amplifier) - a sound blaster with 3x S/PDIF outputs (onboard, cabled and working) - PowerDVD - Vista I want to decode AC3 that come from PowerDVD : - AC3 front (+ Sub) -> 1 PCM stereo channel -> onboard S/PDIF output 0 -> Speakers 1+2 - AC3 rear -> 1 PCM stereo channel -> onboard S/PDIF output 1 -> Speakers 3+4 Any idea? I have tried kX modules, but I didn't find how to do. Thanks Last edited by pomFritz; Jun 10, 2009 at 07:27 AM.

Jun 10, 2009, 11:20 PM	#2
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,563 Rep Power: 62	Re: AC3 decode and send to outputs Hmm, I do not know whether kX supports AC3 decoding currently with Vista or not. In any case, you are probably better off just letting PowerDVD decode it, and then use kX DSP to do the routing.

Jun 12, 2009, 09:58 PM	Thread Starter #3
pomFritz HardwareHeaven Junior Member Join Date: Oct 2008 Posts: 21 Rep Power: 0	Re : Re: AC3 decode and send to outputs OK it works Settings are SPDIF only, 4.1 speakers and AC3 decoding. With PowerDVD I hear front, sub and center in front speakers (connected to onboard SPDIF0) and rear in rear speakers (connected to onboard SPDIF1). I still have a pops problem that I think is related to some samples buffer size. i have created a new post for that.

Jun 12, 2009, 10:49 PM	#4
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,563 Rep Power: 62	Re: AC3 decode and send to outputs Did you end up using kX or PowerDVD for the decoding?

Jun 13, 2009, 02:47 PM	Thread Starter #5
pomFritz HardwareHeaven Junior Member Join Date: Oct 2008 Posts: 21 Rep Power: 0	Re : Re: AC3 decode and send to outputs I think PowerDVD sends the AC3 to the default Vista SPDIF/AC3 output (Dolby checked in Vista sound param) and kx decodes because I see the kx AC3 popup.

Jun 13, 2009, 04:29 PM	#6
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,563 Rep Power: 62	Re: AC3 decode and send to outputs I was just curious because as I said before, I do not know whether kX's AC3 decoder is supported/works currently under Vista, so it is good to know that it is working for you, etc.