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"Back in the day" there used to be a machine called a "minus one", designed specifically to remove vocals for aspiring singers to practice their favorite tunes. Easy in principle, it simply removed centrally panned vocal-spectra from a stereo input source.
Using that principle, combined with commercial
electronic noise-cancellation headphone technology, Club Headphones have 3 basic settings:
1) Simple Vocals Cancellation: identifies a stereo music source, and its positioning (using phase variance) and cancels out the centrally panned vocals (which is where "KJ"s pan their victims as well). This setting is useful not only for karaoke lovers who wish to practice at home or in public without purchasing the special karaoke versions of their favorite songs, but for karaoke haters who wish to cancel out the karaoke lovers on stage in a bar.
2) Audience Vocals Cancellation: identifies the music source/position and cancels out everything *else* in the vocal spectra (by listening for high-frequency overtones that will *not* be in the amplified version due to speaker limitations). Great when there's people talking through your favourite song.
3) Stage Killer: cancels out all amplified sounds: identifies sources and only lets through ones that contain spectra components too high to have come from a soundsystem. Does the band suck ? Turn it off and continue chatting comfortably.
Please send me a pair... soon.
Thompson Vocal Eliminator
http://www.ltsound.com/
Still around... now with Digital Key Transposer [csea, Nov 08 2009]
[link]
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If an audience had control over the spatial control of a
singer, didn't like the singer, and consequently
made their voice appear to come from all over the shop,
would music press headlines the next day proclaim
this artist was "panned by critics"? |
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Could work in the signal domain, hopeless by the time it's an acoustic signal. See [link] for current Eliminator. |
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The only one that could work is the "Stage Killer".
That works by connecting microphones to
headphones and inverting the phase of the
incoming sound waves and playing it through the
headphones at the same amplitude as the direct
sound. |
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The problem with the "Audience Vocals
Cancellation" is that the sound isn't just coming
from the original source. Once it leaves the
speakers, it bounces all over the room picking up
all kinds of room resonance along the way. |
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That said, you might be able to rig something up
with a parabolic microphone (mic which only picks
up one specific source rather than everything in
the general direction) which you could aim at the
source. You would have to be pretty precise
though with the distance between the mic and
your ears though or else the sound would just be
wobbly rather than cut out altogether. That way
you could cancel out the direct signal. you'd still
have the reflections though, but it would still
decrease the volume of the signal you're trying to
cut by a fair amount. |
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As for "Simple Vocals Cancellation", I'm assuming
you're talking about only affecting a signal coming
through the headphone cord from a cd player or
mp3 player or something. In that case, it would
only work on a few songs. Even on those songs,
you'd also be removing things like the kick drum,
snare, and bass which are commonly panned
center. |
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A bun for the intent and a wad of cash for anyone who can pull something even remotely close to this off. |
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[Joolin] odd, I'd think that the karaoke vocals cancellation (Simple Vocals Cancellation) would be the easiest to do seeing as it's an existing mechanism, one need add only a mechanism to recognize a stereo source positio; wouldn't worry about bass/drums though: lo-pass filter ftw. |
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Got so much shit music boomed at me in nightclubs that I still can't stand it, 20+ years later. |
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I'll buy a gross of them. |
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