Hi all,

I'm looking for some testfiles to check bit correct playback on my computer. I was thinking of using DTS or DD test files in 44.1 kHz WAV format and playing them through my digital out to my receiver. However, I cannot find such samples. Anyone got a link?

Never mind, allready found a source....

I've got one, but I'm curious where you got yours? I'm always on the lookout for good DD/DTS test files, preferably one that can test each channel individually.

Found 2 samples on this site. It does no channels individualy though...

Do you have by any chance some DTS files?

I was feeling pretty bored (and I wanted to take my mind out of the test for some time), so I created a test stream:

http://pessoal.onda.com.br/rjamorim/stuff/test.dts.zip

It goes around all the channels, doing LFE -> Left Front -> Left Rear -> Right Rear -> Right Front -> Center, saying out loud the channel in an ugly synthesized voice (hey, it could have been my whiny voice). Of course, there is no voice at the LFE channel (no voice survives lowpassing at 120Hz), just a test signal (white noise).

If it works out well for you, I can create an AC3 as well.

Regards;

Roberto.

See also http://www.sr.se/multikanal/english/e_index.stm for lots of DTS samples.

Roberto, if you could create an AC3 that does just that, it would be really really awesome.

The reason I'm looking for such a sample is because I want to see just how good Dolby Pro Logic II can be and ultimately, see how most codecs handle surround downmixing. There are more resources/options for transcoding AC3-> 2-channel wave, so having a good test AC3 is better than a DTS one.

Voilà

http://pessoal.onda.com.br/rjamorim/stuff/test.ac3.zip

Hope it works.

Edit: Just for kicks and giggles, I added an AAC test stream as well (had to get Alexander to bugfix Compaact first )

http://pessoal.onda.com.br/rjamorim/stuff/test.m4a

Thanks. I don't think I can take advantage of the AAC file since I'm testing my receiver, and I can't S/PDIF out an AAC file (nor would my receiver accept it).

Or is it a DPLII downmixed AAC?

Anyways the first thing to note is that DPLII is not perfect (or at least HeadAC3e's downmix algorithm isn't perfect). The surrounds played back what they were supposed to, but there was a lot of bleeding between the surrounds. For example when the right rear channel was supposed to be playing, the left rear speaker played it as well, but quieter than the right.

Also, your synthesized voice DOES have some sub-120Hz frequencies, because part of the voice played back through the subwoofer (I pulled the plugs on the front speakers to test the surrounds).

Just tried with BeSweet and there IS a difference. I abxed it at 13/14, and I even got my girlfriend to abx it at 12/14.

I'm going to start a new topic tomorrow to discuss this.

No, standard 6 channel AAC.

I would create a Vorbis too, but I didn't find any tool that accepted each mono channel separately (allowing you to determine the order), and I have no clue how to merge them together properly to obtain a 5.1 wav.

I created the DTS with Surcode DTS for DVD and the AC3 with Sonic Foundry's Soft Encode. As mentioned earlier, the AAC was created with Compaact. I didn't create it with Nero for the same reason I didn't create an Ogg: no way to input channels separately.

Hi Roberto,

Thanks for your effort!

there's ways of making multichannel wavs... i'm sure DSPguru has some tool for it. i use Bidule for it, but that's not the best solution if you're only interested in combining wavs.

hmm... looks like bidule's the best option i have ATM, but i've got a commandliner that combines 2 stereo files into a 4-channel file.