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I know it's a crazy (bad) idea, but still: I hate having many cables attached to a music instrument when I move in the room. Let's take the example of a Akai MPC500 sampler: it is battery powered (so no power cable needed), but I still have 2 cables attached to it:

  • a long 6.35 mono jack cable (unbalanced, it's ok for this purpose)
  • a MIDI cable (DIN connector on both ends)

Question: could we make both a audio channel (20Hz-20kHz signal) and MIDI signal (serial data @31250 baud) transit in the same jack cable (i.e. only 2 wires: ground and signal)?

Probably with a filter, like when with ADSL 20 years ago, we could use Internet and someone talking on the phone (not VOIP but old analog phone) at the same time.

Something like that:

enter image description here

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  • \$\begingroup\$ If you're building custom adapters/ends anyway, is there a reason you don't want to use a 3-conductor cable? \$\endgroup\$ – Kevin Reid Sep 27 at 14:25
  • \$\begingroup\$ @KevinReid I have lots of (good) mono jack cables to use, I'd like to avoid buying ones. And also because I'm curious about this challenge: make both bytes data and audio data transit in the same wires :) \$\endgroup\$ – Basj Sep 27 at 14:29
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    \$\begingroup\$ Sure, modulate your signal on a high frequency carrier and you should be able to do this. I have strong doubts as to whether it's worth the trouble, though. \$\endgroup\$ – Hearth Sep 27 at 14:43
  • \$\begingroup\$ do a ultra-sonic Frequency Shift Keying of the MIDI, well above the audio; and keep the MIDI channel amplitude well below the audio level, to ensure minimal residual MIDI after high-pass-filtering \$\endgroup\$ – analogsystemsrf Sep 27 at 15:07
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    \$\begingroup\$ @downvoter: please leave a comment about how could I improve the question, thanks in advance \$\endgroup\$ – Basj Sep 27 at 16:32

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