Difference between revisions of "Channel coupling"
From Hydrogenaudio Knowledgebase
Redirect page
|
|
| (14 intermediate revisions by 6 users not shown) |
| Line 1: |
Line 1: |
| − | Channel coupling is a method used to reduce [[bitrate]] demand by coding the stereo channel information more efficiently. there are several channel coupling methods. In mp3 the general term is [[joint stereo]].
| + | #REDIRECT [[Joint stereo]] |
| − | | + | |
| − | [[MP3]] can use 2 different channel coupling methods: mid/side-coding and [[intensity stereo]]. Mid/Side-coding calculates a "mid"-channel by addition of left and right channel (l+r)/2 and a "side"-channel (l-r)/2. With more mono-like signals one can use less bitrate]] to encode the side-channel, so that the overall bitrate will be less than encoding the left and right channel. Intensity stereo destroys phase information, so it's used only at low bitrates.
| + | |
| − | | + | |
| − | Correctly implemented MP3 mid/side stereo (like in [[LAME]]) does very little or no damage to the stereo-image and increases compression efficiency either by reducing size or increasing overall quality.
| + | |
| − | | + | |
| − | [[Ogg Vorbis]] and several [[lossless]] audio compressors can also use lossless channel coupling. In lossless channel coupling the channels will remain exactly the same as with stereo coding after the decoding.
| + | |
| − | | + | |
| − | Ogg Vorbis uses lossless channel coupling for high bitrates only.
| + | |
Latest revision as of 05:22, 16 July 2023
