I couldn't decide whether I should post this here or in the technology forum.

My question is this: What technique is used to convert a mono signal into a stereo signal without causing other incoming stereo signals to merge together?

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"Iron sharpeneth iron; so a man sharpeneth the countenance of his friend." - Proverbs 27:17

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You can't accuratly go from mono to stereo. Once a signal has been converted to mono, all stereo information is permanently lost. The closest you can get is using some sort of stereo enhancing plugin to simulate stereo, but you can never get the audio back to it's original stereo...ness....

Running a mono signal through a stereo adapter still only produces a mono signal. It's like trying to undo bad image file compression.

If you can get a stereo amp, that's the only way I can think of. Stereo can go to mono, but mono can't go to stereo, unless you add another "thing" to it.

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Mono most certainly can go to stereo, or we wouldn't have stereo signals in recording coming from mono inputs, would we? Have a stereo effect processor? I do. Mono guitar input, stereo guitar output. But how?

This same thing is done in sound boards. All inputs are mono, but can be "deflected" to only left or right channels, without interrupting other signals. The only thing I can think of is force the signal onto a DC source, pass it over a diode, then filter the DC back out with a capacitor. I've tried that, but with no success yet. The amplitudes of the signal get severely clipped, producing the crappiest distortion in the world.
In simulation, however, the following circuit works. (It would require some amplification, but this is just the basic principle.)

In actual practice, though, it doesn't.

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"Iron sharpeneth iron; so a man sharpeneth the countenance of his friend." - Proverbs 27:17

Catalog of Electronic Components - Complete IC data sheets
National Electrical Code (NEC) Online - Don't do wiring without consulting it. OR ELSE!

[This message has been edited by DogSRoOL (edited March 07, 2004).]

I missunderstood the question. The easiest way would be to get ahold of a mixing board, or use a virtual one.

On another note, the grid would be an excellent place for this question. It's a drum n bass message board that focuses on production, and those cats are freaking smart. http://www.dogsonacid.com/forumdisplay.php?forumid=4 is the direct link to the grid. I can almost guarantee some sort of answer if you post there.

Easy? Maybe, but I'm trying to create a 16-channel mixing board with stereo controls that conver to a left/right output set. The actual sound board will relay these 16-channels to the mixer I'm trying to make, and provide a new mix for recording. Using the live mix... well... just simply doesn't work.
I also have alternative uses for the info I seek. I made a box that converts my stereo guitar signal into seperate mono signals (to relay to the sound board), plus a mono input that needs to share the same channels (for an acoustic simulator). Simply wiring them together doesn't work. The left & right stereo signals merge.

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"Iron sharpeneth iron; so a man sharpeneth the countenance of his friend." - Proverbs 27:17

Catalog of Electronic Components - Complete IC data sheets
National Electrical Code (NEC) Online - Don't do wiring without consulting it. OR ELSE!