Rotary Speakers also ORBIT
The pulsation of a rotary speaker and our electronically ORBITED speaker produce the same acoustic spatial effect.
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Mechanically for one and electronically for the other. -
Both speaker designs have the sound movement (sound displacement) going around in a circle making an orbit.
The sound source has to physically move (or be displaced) towards and away from you for the pitch shift of the Doppler Effect to work.
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This has to happen in a circle or a line, separated from the center. -
The Doppler Effect happens during part of an orbit.
The rotary speaker achieves this displacement (movement) of sound by using a rotary mechanism that spins the horn where the mouth of the horn moves in a circle making an orbit.
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This sound displacement (movement) does not rotate.
The sound source is the mouth of the horn, so as the mouth moves toward and away, the pitch is shifted
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The only situation where a rotating mechanism can be part of a displaced sound movement is if it's part of an arm that swings the sound around. -
The long narrow neck of the horn becomes the arm.
Rotation movement does not cause displacement (movement) of sound and, therefore, cannot create the Doppler Effect
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Rotation is movement that doesn't go anywhere; it is not moving in a circle nor does it move away or towards the listener in a line. -
Rotation is movement moves in the same spot, never going towards or away from the listener. It's only moving on its own axis.
The ORBITED speaker accomplishes this sound movement (displacement) by electronically, physically displacing the sound source, moving it from one face of the cabinet to the next around in a circle making an orbit.
When the sound source moves from the front, to a side and to the back face, the pitch is shifted down. The pitch shifts up as the sound source returns from the back to the front.
If the movement of the sound source is only side-to-side, there is no change in distance to the listener and no pitch shift occurs.
Similarly, if a speaker driver simply rotates or has a short arm (as in the many other older competing designs) as opposed to a long arm moving in a circle, there is no change in distance to the listener and again little or no pitch shift occurs.
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If you place a speaker in one spot and rotate it on its axis, nothing changes. -
If you take that same speaker, even though the sound is going in all directions, and move that speaker towards you, the frequency goes up. If you move it away from you, the frequency goes down.
The reality is that most speakers are omni-directional with the sound going out in all directions.
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The smaller the sound source, the more omni-directional it is.
Back to Technology
Why ORBITED?
It's the Doppler Effect... Hmmmm, not so fast.
It's all about the resonances bouncing inside the box... or is it?
How the ORBITED speaker is different from Electronic Simulators
Mic Placement for a Rotary Cabinet
Mic'ing a Rotary Cabinet on Stage
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