Common mode, differential mode: Difference between revisions
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:: e.g. while introductions to XLR make a big kerfuffle over sending signal/2 and -signal/2 on the two wires, it is ''entirely valid'' to send all the signal on one wire and nothing on the other (which you'd easily call single-ended), because after differential interpretation this implies the same signal, and the differential-based noise reduction is not affected at all. | :: e.g. while introductions to XLR make a big kerfuffle over sending signal/2 and -signal/2 on the two wires, it is ''entirely valid'' to send all the signal on one wire and nothing on the other (which you'd easily call single-ended), because after differential interpretation this implies the same signal, and the differential-based noise reduction is not affected at all. | ||
::: In fact, doing this inside a balanced output driver seems moderately common{{verify}} because it is a little simpler component-wise. <!--{{comment|(It may (or may not) be approximately 3dB {{verify}} quieter, but this is rarely an issue)}} | ::: In fact, doing this inside a balanced output driver seems moderately common{{verify}} because it is a little simpler component-wise. <!--{{comment|(It may (or may not) be approximately 3dB {{verify}} quieter, but this is rarely an issue)}} and depending on what you stick after it, there may be no practical difference.{{verify}} | ||
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Latest revision as of 00:28, 21 April 2024
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
Common mode versus differential mode is about communicating a signal electrically, usually as a voltage signal.
Theoretical side
Common mode
Common mode signalling points at a situation where you have
- a reference conductor, which both ends of this communication have in common
- often called "signal common".
- a conductor for a signal
And the signal is the voltage difference between the two.
Differential mode / differential signalling
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
Perhaps-necessary clarification
Common mode, differential mode, single ended
If a distinction is made between single ended and common mode, single-ended often refers more to the concept, common mode more to electrical reality of conductors.
Both single-ended and common mode are mainly contrasted with differential mode
Differential in more depth
Practical side
Balanced audio / pro audio
See Music_-_studio_and_stage_notes#Notes_on_balanced_audio
Comparisons
See also