Few
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- Oct 27, 2020
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I was trying to imagine ways to minimize the sound-reflecting surfaces in the mic support structure. Along the way it occurred to me that the rigidity of a conventional CNC router isn't necessary if the goal is to position a microphone with no forces acting on it.
So maybe the approach used in the Maslow CNC router could be adapted. The core idea is that the object to be positioned (here the measurement mic) is suspended by a couple pairs of suspension cables. The cables are retracted or deployed by stepper motor-controlled pulleys mounted on tracks mounted on the ceiling. This allows the mic to be positioned anywhere in the plane containing the two pulleys, limited by their spacing. That plane could be moved closer to or farther from the speaker by translating the stepper-pulley systems along the ceiling tracks. In an attempt to convey the nature of the motion, I drew up a sketch that shows the mic in two of the possible positions.
Obviously the software driving the stepper motor controller would have to do a little trigonometry to convert the desired mic position to pulley rotation. I've also left out some practical details that would have to be ironed out so that the mic moves as intended, but I hope the basic idea is clear. The approach doesn't require many parts so if the idea turns out to be a bust at least there wouldn't be a lot of money invested!
Few
So maybe the approach used in the Maslow CNC router could be adapted. The core idea is that the object to be positioned (here the measurement mic) is suspended by a couple pairs of suspension cables. The cables are retracted or deployed by stepper motor-controlled pulleys mounted on tracks mounted on the ceiling. This allows the mic to be positioned anywhere in the plane containing the two pulleys, limited by their spacing. That plane could be moved closer to or farther from the speaker by translating the stepper-pulley systems along the ceiling tracks. In an attempt to convey the nature of the motion, I drew up a sketch that shows the mic in two of the possible positions.
Obviously the software driving the stepper motor controller would have to do a little trigonometry to convert the desired mic position to pulley rotation. I've also left out some practical details that would have to be ironed out so that the mic moves as intended, but I hope the basic idea is clear. The approach doesn't require many parts so if the idea turns out to be a bust at least there wouldn't be a lot of money invested!
Few