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Difference Between Joint Stereo and Stereo

orangutang

Sorry if this is a stupid question but what exactly is joint stereo?
November 21, 2006 @06:57am
tech1

I'm not 100%, but it seems to be a simpler (albeit more confusing) way of saying stereo interleaved. In other words, it is 1 file that contains 2 channels, as oppsed to "regular" stereo, which is really 2 separate files, each marked left or right.
November 21, 2006 @05:24pm
sabianq

Joint Stereo is an interesting mathematical technique which is used to enhance the quality of highly compressed digital audio. usually associated with MP3 but "joint stereo" is used with other compression techniques also.
As one becomes familiar with audio compression people usually come to the opinion that Joint Stereo is BAD. Being the fact that is not really a true stereo image as the dual channel of true stereo is compressed into one single "mono like" file and uses math to separate out the left and right signals.
(in a stereo sample, both left and right channels have a lot of the same information so some people thought they could save space by compressing the left and right image information that is the same into a single mono track while leaving only the left and right separate samples separated.
some people who call themselves audiophiles express way more distaste for joint stereo than they do for normal stereo compressed (lossy) formats like mp3 and WMA.
November 21, 2006 @08:11pm
tech1

Sabianq, I stand corrected. This too: http://en.wikipedia.org/wiki/Joint_stereo
November 21, 2006 @09:55pm
AndyH

There are many different schemes and different encoders for them, so I don't know and cannot write about all of them.
Joint stereo is used in lossless compression. Since it is lossless, there is obviously no loss of anything. Joint stereo is a technique to save storage space, nothing more.
For good mp3 encoders, joint stereo is as it is in lossless compression, a method of reducing file size without reducing audio quality or effecting stereo separation. This has been tested and written about in exhaustive detail regarding LAME, which is most likely the best mp3 encoder going. Much information is available on Hydrogen Audio
http://www.hydrogenaudio.org/forums/index.php?act=SF&s=&f=62
November 24, 2006 @03:16am