DTS 16bit/768kbps & AC3 32bit/448kbps

[Sherlock_2]

Hi guys
I thought audio in DVDs are always 32bit.
But some days ago my friend says that in DVDs AC3 is 32bit but DTS is 16bit.
Now it make for me a question.
First of all I need to know is this right or not ?
And if it is true , then why the quality of DTS is more higher than AC3 ?

Thanks and waiting for reply

[KpeX]

DVD specs support up to 24 bit for both AC3 and DTS, but both are almost always 16 bits/sample.

The quality of DTS versus AC3 is a matter of opinion. One is not clearly higher quality than the other, although DTS usually uses much higher bitrates than AC3.

However keep in mind that higher bitrate does not always mean higher quality (think of MP2 vs MP3 vs AAC for example).

More information here (http://www.dvddemystified.com/dvdfaq.html#3.6).

[Sherlock_2]

Yeah you are right
But DTS 16bit/768kbps vs. DTS 24bit/768kbps
You see that the second one has higher quality than the first one.

Anyway
But I see that every softwares they can transcode a DTS file to 6 mono WAV , only can transcode 16bit. and they can't transcode 24 bit or 32bit.

I need to know how can I transcode in 32bit (or 24bit) ?

Thanks in advance

[SomeJoe]

Like KpeX said, there is no such thing as audio which uses 32-bit sampling. 24-bit sampling is the highest sampling size I've seen. There are very few tools that will work with 24-bit sampled PCM. Sonic Foundry Sound Forge and CoolEdit/Audition are two commercial programs that will.

Originally posted by Sherlock_2
Yeah you are right
But DTS 16bit/768kbps vs. DTS 24bit/768kbps
You see that the second one has higher quality than the first one.


Ummm ... this is not true. You must remember that DTS (and Dolby Digital and MPEG-2 and AAC and etc. ...) are all lossy algorithms. They throw away redundant and inaudible information to reduce the bitrate.

For those DTS streams, there is only so much audio information that can be packed into 768kbps. Anything that the algorithm determines that wouldn't be audible or would be unimportant will immediately get thrown away. It's already hard enough to encode 6 channels of 16-bit samples into 768kbps. What do you think the DTS algorithm is going to do with the extra 8 bits per sample? I'll give you a hint: round file. :)

It's just like when you go to encode noisy video to MPEG-2. Noisy video causes MPEG-2 artifacts to appear. If you run a smoother on the video (thus throwing away some detail) you reduce the artifacts because the video becomes easier to encode. Same thing here. It's conceivable that 24-bit samples could increase the artifacts in the compressed DTS stream.

Originally posted by Sherlock_2
why the quality of DTS is more higher than AC3 ?


Who told you that? ;)

Just because DTS uses a higher bitrate does not make it sound better. You cannot compare the two different codecs solely on bitrate. Try listening to ADPCM at 500kbps. It sounds like crap compared to MP3 at 128kbps. Why? Because the codecs can't be compared - they're very different approaches to compressing audio.

DTS uses a lot of ADPCM and prediction in it's compression. Dolby Digital relies much more on psychoacoustic modeling and masking. It's two very different approaches to compressing audio. In order to find out which one sounds better, you need to listen to them both, using YOUR material, and played back on YOUR system.

Don't just believe that bigger is better.

[Soulhunter]

Originally posted by Sherlock_2
But DTS 16bit/768kbps vs. DTS 24bit/768kbps
You see that the second one has higher quality than the first one.
Why... :confused:

The bitrate is same for both... :rolleyes:

So, the second one has a higher compression then !!!


PS: "Full-rate" DTS sounds definitely better for me... ;)

[EDIT: Ohw, SomeJoe was faster... :D]

Bye

[puzio]

Hello All.

How can I check if DTS (or AC3) is 16-bits or 24-bits?

THX.

[Sherlock_2]

Thank you very much Somejoe for your nice explanation.
But I want to say that if I said DTS has a better quality than AC3 , I didn't see the capacity. I checked them in my home theaterment system.
I played part of a film in dolby5.1 , then that time , I played that part with DTS audio.
There was a lot of different between them.
And DTS was better a lot
Anyway

Now how can I decode DTS to 6 wavs in 24 bit ?
(I don't want to decode to 16bit then convert that to 24 bit using cooledit or audition ot whatever)