Help with DTS 5.1 Audio CDs

[ontherocks]

I have an Acer AST180 PC which has support for digital audio. I connect it to my Sony HTDDW750 receiver through Coaxial cable. I have enabled Digital Audio Output in the Sound Manger in Windows.

I am trying to play DTS 5.1 Audio CDs in PowerDVD or WinDVD

This is what happens in the following two cases:-

Case I - Audio Output setup in WinDVD or PowerDVD set as Stereo
I play a DTS 5.1 Audio CD, the audio is perfect from the receiver's speakers BUT it is 2.1 (Receiver doesn't show DTS). This case seems fine.

Case II - Audio Output setup in WinDVD or PowerDVD set as Digital SPDIF
I play a DTS 5.1 Audio CD, the audio is garbled, noisy and whatnot. (Receiver does show DTS 5.1)

What is the problem in case II and what is the solution??

(BTW.......All DTS 5.1 DVDs play perfectly in the PC and the same DTS 5.1 Audio CDs play perfectly in a standalone DVD player connected to the Sony receiver)

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Acer Aspire AST180
Windows XP SP2
Realtek HD Audio
Sony HTDDW750

[Phlexor]

As far as I know, DTS 5.1 Audio CDs are at 44.1KHz and most SPDIF outputs from PC soundcards are all upsampled to 48KHz. And most of the time there isnt anything you can do about it. Unless someone else has any advice for this.

[guns1inger]

In case one, all the decoding is done at the PC end. In case 2 the digital signal is sent to the receiver. It should go as is, without any upsampling or change. If you have a standalone DVD player, try playing it in this using a digital connection to your receiver. If you still get pink noise (and keep the speakers down low while you test or you could blow them) then the problem is with your receiver and DTS CDs, and not your PC. If it does work, you know you have to look at how your PC is configured.

[ontherocks]

As far as I know, DTS 5.1 Audio CDs are at 44.1KHz and most SPDIF outputs from PC soundcards are all upsampled to 48KHz. And most of the time there isnt anything you can do about it. Unless someone else has any advice for this.

Yes I guess you are right. Its the resampling thats the culprit.
Strange that my on-board audio as well as PCI soundcard both are doing the resampling. I even tried it in another PC and its the same case there too.
Is it possible to resample the audio to 44.1 KHz back using Reclock or something??

[ontherocks]

If you have a standalone DVD player, try playing it in this using a digital connection to your receiver. If you still get pink noise (and keep the speakers down low while you test or you could blow them) then the problem is with your receiver and DTS CDs, and not your PC. If it does work, you know you have to look at how your PC is configured.

I did exactly that (I told it in my post). It plays fine through Standalone DVD Player -> Toslink -> Receiver (Shows DTS 5.1 in the receiver). There is no problem with the Receiver and the Audio CDs (I made sure of that).