5.1 tracks playing back on PC at higher pitch than should

[Veech]

I just bought a DTS encoded CD, and playing it back on my PC it plays at a higher pitch (and tempo I think) than the original track. Ithough this was ana anomaly, but I jsuty tried encoding a 5.1 AC3 with Soft Encode 1.0, and when I played the file back it too played back at a higher pitch than it should. Very strange, somehow linked to the DTS decoding process? I'm using a Creative Audigy 2 Platinum Pro card, but the decoding is being done by my Logitech Z-680 speakers.

Could it have anything to do with the Asus P4C800 board which for some reason is OC'ing my P4 3.0 to about 3.25? Apparently the Asus board has this "AI" program which runs the system at "optimum", so it automatically OCs the P4, would this cause the higher pitch??

Sorry, this is kinda OT but I have no idea where to go to get an answer..

thanks to anyone who can help!

Veech

[Dragonsf]

Does it sound like a 44KHz sampled Audio - played back at 48KHz S/R?
Maybe your CD's audio was done with a wrong sample rate or the header of the audio stream is wrong.

[Veech]

I'm not sure what that would sound like.. I thought everything had to be 44KHz to play, I thought 48KHz would give static. It sounds more like if you take a wave file and using CEPro or Sound Forge, increase the pitch and tempo by 10% or so.

Veech

[Dragonsf]

Yes, 10% pitch/speed increase is what you get, when you play 44KHz material with 48 Khz sample rate. AC3 is normally 48Khz, so should be DTS. What kind of video is this anyway=SVCD VCD or DVD?

[Veech]

I thought 44.1KHz & 48KHz were basically incompaitble, but you're saying that DTS discs and AC3 files are encoded in 48KHz and playing them back on a 44.1KHz decoder will result in about 10% increase in tempo and pitch? Then it seems all I need to do is find a way to adjust the decoder (the Logitech Z-680's) to recognize the DTS discs and AC3 files as 48KHz and decode the signal properly? hmmm...

There is no video involved at all in this, it's strictly audio related, that's why I mentioned that it's kind of off-topic, but I'm hoping that someone like you who is knowledgable about DVD, DVDR, SVCD etc could help me solve this dilema. Not to doubt, but you know for a fact that this could be causing the problem?? btw, when I play DVDs on the computer, there are no issues with tempo and pitch, even when using the same decoder set-up. It just occurs on the DTS 5.1 audio disc and a 5.1 AC3 file I encoded.

wow, this would be good news if only now I can figure out how to change the decoder frequency in the Logitech Z-680's.

thanks Dragonsf.. and anyone esle who chips in..

Veech

[Dragonsf]

IMHO it's the other way around:Somehow 44Khz audio was encoded as 48Khz AC3/DTS.This might explain the increase of pitch.
If you play 48Khz as 44kHz, you'll notice a lower pitch.
I'd decode the CD with BeSweet and analyse the waves with CEP.