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J-Stereo and I-Stereo, What's the difference?
IGOR][X
post May 16 2003, 23:36
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Someone can tell me the difference between Joint Stereo and Intensity Stereo?

Why I-Stereo isn't supported by Lame 3.9x?

Will it be supported by Lame 4?
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yourtallness
post May 16 2003, 23:49
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Why do u care about intensity stereo?
From what I know (I might be wrong...) intensity stereo sucks.


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rjamorim
post May 16 2003, 23:56
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Excellent explanation, yourtallness. biggrin.gif

IIRC, IS is really a mono stream with directional info - to 'emulate" a stereo effect.

JS is 2 strems, and some frequencies are shared, if I'm not mistaken.

Lame doesn't supports IS because it's targeted at high quality, and IS is only useful at low bitrates.

Takehiro plans to implement IS on Lame 4.0, IIRC.

This post has been edited by rjamorim: May 16 2003, 23:57


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IGOR][X
post May 17 2003, 00:01
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Well,i'm reading here

http://www.hydrogenaudio.org/forums/index....ST&f=16&t=9238&

and Takehiro writed

"Intensity stereo is "must" item before public testing, but it is completely new code and it takes long time to finish implementing.

ABR/CBR noise shaping code are almost finished. But bit resovoir code need to be tuning for short blocks and lower bitrate. This tuning will start after implementing i-stereo."

so i'm a bit curious..and i'm waiting to something that explain me the difference between I-S and J-S

rolleyes.gif
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IGOR][X
post May 17 2003, 00:05
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QUOTE (rjamorim @ May 16 2003 - 11:56 PM)
Excellent explanation, yourtallness. biggrin.gif

IIRC, IS is really a mono stream with directional info - to 'emulate" a stereo effect.

JS is 2 strems, and some frequencies are shared, if I'm not mistaken.

Lame doesn't supports IS because it's targeted at high quality, and IS is only useful at low bitrates.

Takehiro plans to implement IS on Lame 4.0, IIRC.

Tnx for the explanation smile.gif

"IIRC"...what does it mean? blink.gif
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rjamorim
post May 17 2003, 00:10
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QUOTE (IGOR)
[X,May 16 2003 - 08:05 PM] "IIRC"...what does it mean?  blink.gif

If I Remember Correctly


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IGOR][X
post May 17 2003, 00:13
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QUOTE (rjamorim @ May 17 2003 - 12:10 AM)
QUOTE (IGOR)
[X,May 16 2003 - 08:05 PM] "IIRC"...what does it mean?  blink.gif

If I Remember Correctly

Tnx biggrin.gif
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floyd
post May 17 2003, 00:19
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i thought intensity stereo would switch to mono if a strong signal was in one channel? (assuming i guess that you couldn't hear the other channel anyway) Maybe I'm wrong, there isn't to much talk about IS on these boards.
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Gabriel
post May 19 2003, 09:57
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http://www.mp3-tech.org/tech.html
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floyd
post May 24 2003, 05:02
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Thanks for that description of IS, Gabriel. Makes alot of sense now.
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