3 ms·
> common signal in both (i.e. the sound coming out of the speakers) is nulled out, but the difference signal (the voice) makes it through. What drives this? Si
by itishappy 2y ago
> common signal in both (i.e. the sound coming out of the speakers) is nulled out, but the difference signal (the voice) makes it through.
What drives this? Singers and speakers are both localized sources, so I'd expect the mics to pick up similar phases for each.
I bet it's distance! Falloff depends on distance to source, so there should be a larger difference in volume for closer sources.
- llamaimperative 2y agoYeah one microphone was behind the other, though I was under the impression it was half a wavelength behind and thus created something quite akin to modern active noise-cancellation? Edit: Apparently this is not the case!
- itishappy 2y agoA very literal phased array!
- bregma 2y agoWhen I saw them (back in 83, it's been a long strange trip) it looked more like one mic was on top of the other with about a 6 inch separation.
- dekhn 2y agoSee https://archive.org/post/256492/the-betty-question-answered https://archive.org/post/256492/the-betty-question-answered for more details both on WoS and the microphone setup.
- dylan604 2y agoHalf wave length in what frequency would be the first thing that would give me pause to this. I'm reading this after your edit, but even before I got to the edit my brain was already heading towards nope
- llamaimperative 2y agoYeah that asterisk popping up in my head was why I did some more digging as well :) thought tbf, the Dead never seemed to care much about vocal quality so it wouldn’t have been crazy for this to work well only for a narrow band. I don’t have any intuition for exactly how narrow that band would be and how that’d sound in practice though.
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- scrumper 2y agoYep, you sing into one but not the other, so there's a big difference in the vocal signal, whereas spill from the speakers is going to hit both mics pretty well evenly.
- deleted 2y ago[deleted]