Stereo - Joint Stereo - Dual Stereo

[techno]

Hi guyz.

I am wondering if any one can tell me or even do me a small favour.

I know Stereo is great! (no doubt about it).

I am a local DJ (sorta).

For people out there who listen to Dance or Trance music (even hardcore) We all know they use Joint Stereo - gives it that extra "wooppphhhh" effect. Which makes us go into a trance! hehe

Now, I am wondering..kinda a daft question....

Does Joint Stereo take more space up than Stereo in MP3 files?

I done 3 tests...and Joint Stereo .. believe it or not... reduced the file size a touch!

Of course..there is nothing good as True stereo!

What file sizes do u get?

Also..what does Dual Stereo sound like? does it take more file size?

Thanks

Techno

[benderman]

Examples@128kbps

Mono: 128 kbps for the one and only channel
Stereo: 128 kbps for both channels
Joint Stereo: 128 kbps for both channels, CH2 is saved as difference from CH1
Dual Stereo: 64kbps for every channel, every channel encoded seperately

If you use 128kbps all 4 modes should produce the same filesize. If you ask for quality - you're the DJ, you should know.

[techno]

Quality - I am using joint Stereo all the time for my gigs etc...

but..

wanted to see the difference on the PC first! This will be for my NEWER versions of Music vids I capture and encode.


Techno

[Enchanter]

Use Joint Stereo for 128kbps or lower. Joint Stereo will take into consideration the similarities between the two channels, requiring less bits than it would for a plain stereo setup. The extra bits will then be used for other parts of the sound. This translates into better utilisation of the bitrate, resulting in better sound quality than if you used Stereo.

However, at 160kbps or higher, the bitrate is high enough that the use of Joint Stereo does not present the advantage it offers for the lower bitrates. Hence, Stereo would be the one to use in this case.

However, be aware that if your audio source is especially "wide" and you use Joint Stereo, this will create the annoying "flanging effect." In that case, Stereo should be used.

[techno]

yeh...I know about that last part...thanks Enchanter

You know u can be a qualified sound engineer?

Seriously...I'm still waiting for my certificate...........didn't really cover much about the types of stereo's.

Techno

[Enchanter]

No worries. Hanging around the 3DSoundSurge Forum has given me a better appreciation of sound.

[techno]

excellent

[setarip]

The following is the exact quote of the "Stereo.txt" file that is part of the original DivX v.3.11 package (which an unnamed poster apparently decided to plagiarize):

"Q : What's the difference between the various stereo modes?
A : It's important to understand the difference between Stereo and Joint Stereo.
'Joint Stereo' modes take advantage of the similarities between the L+R
channels. This allows more bits to be used in other areas and in many cases
this can give an overall gain in encoding quality. Almost all encoders use
joint stereo when encoding at 128 kbits.

Joint stereo has 2 submodes called IS and MS. 'Joint Stereo IS' destroys
phase information and shouldnt be used for high-quality encoding.
'Joint Stereo MS' means Middle/Side and is OK for use in most encoding.

However, for some audio, Joint Stereo MS may create a 'flanging' or
'swishing' effect. In these cases it's better to use 'Stereo mode'. This
mode creates 2 independent channels for both left and right. When stereo
mode is used, you should also use a higher bitrate (160 or 192 kbits) -
Stereo mode will allocate about half of this bitrate for each channel.

In summary, for most audio, Joint Stereo MS at 128 or 160 kbits should be
fine. If your audio is especially 'wide' and creates flange you should use
'Stereo' mode. You can change these modes in the Radium codec control panel."

[techno]

thanks setarip..........i know about that, i wanted a more sorta, in depth detail.

thanks

[Enchanter]

@setarip

What I wrote down here I learned from elsewhere and not from the Radium FAQ, which you apparently and sorely mistake as the sole source of information on this matter. If you wish to taint your reputation as an honorable poster by striking at others at every chance presented, do so in another place. It is sad to see that someone such as you has taken to this kind of attitude...

[techno]

hmmm....

Yeh, I agree with Enchanter...in a way

Peace..

[setarip]

To Enchanter

Since I have no desire to let this go any further, I'll simply state the following:

Between your self-important "responses" (more accurately, putdowns) to newbies and Benderman's taking personal offense at grateful posters using superlatives, one might think you folks control or own these boards.

[Enchanter]

Between your self-important "responses" (more accurately, putdowns) to newbies and Benderman's taking personal offense at grateful posters using superlatives, one might think you folks control or own these boards.

And so you claim...

And I don't see the reason why I'm the only one you're taking notice here and striking at. As frequent posters in this board, I'm sure we have seen others' errors as well. I hope we can stop this useless thing. It's a shame that I was looking up to you when I first joined the board and now you're acting like a child against me.