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Old 8th August 2012, 06:13 AM   #221
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You are constantly trying to explain how a conventional cone speaker works. We know that already.
I thought this discussion was whether/how the planot driver works.
I'm with SY here: for the planot 'diaphragm' it's mass, stiffness, geometry.

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Old 8th August 2012, 06:30 AM   #222
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What about distributed modes, NXT etc. Surely Julian's prototype clearly shows that the Planot is nothing more than another form of NXT style speaker!!!!
When are you guys going to get it? There is no extraordinary invention or specialised physics at work here............it's simple excitation of a tube via a magnetic motor/voice coil.

Where does a conventional speaker get it's sound?..........from the vibrations generated from the voice coil.
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Old 8th August 2012, 09:27 AM   #223
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Quote:
Originally Posted by ziggyr View Post
it's simple excitation of a tube via a magnetic motor/voice coil.
Can you explain that simple what happens if at least half a pound of even distributed mass, at a varying distance from the neutral axis, is twisted (clockwise and counter clockwise) over a 48" length, at 10kHz and more ?
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Old 8th August 2012, 11:05 AM   #224
oshifis is offline oshifis  Hungary
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Quote:
Originally Posted by ziggyr View Post
What about distributed modes, NXT etc. Surely Julian's prototype clearly shows that the Planot is nothing more than another form of NXT style speaker!!!!
When are you guys going to get it? There is no extraordinary invention or specialised physics at work here............it's simple excitation of a tube via a magnetic motor/voice coil.

Where does a conventional speaker get it's sound?..........from the vibrations generated from the voice coil.
But what I don't understand, how can a tube rotating around its axis generate any sound...
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Old 8th August 2012, 12:49 PM   #225
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You don't understand the sound of a hand waving ?

(with a little draft, even a rotating round tube could produce sound)
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Old 8th August 2012, 01:16 PM   #226
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Doesn't even need a draft- there's drag at the surface. Damn inefficient, but nonzero.
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Old 8th August 2012, 03:55 PM   #227
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Originally Posted by oshifis View Post
But what I don't understand, how can a tube rotating around its axis generate any sound...
Hah! Spin it fast enough and the air boundary layer will start to delaminate and you've got yourselve a nice sonic boom! That must surely qualify as 'generating sound'

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Old 9th August 2012, 12:29 AM   #228
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I have already explained how the tube makes sound.

The rotation of the rod is a byproduct of the way it is attached to the motor and rotates left and right exactly as it does in a hard drive, but with homing magnets to control ''over rotation''..........a sort of brake system.
Everyone seems to be fixated by the ''rotation of the rod''. This is due to the clever marketing hype on the PLanot's website. It is NOT the rotation that is causing ''pressure waves'' or anything like that.That is ridiculous!
It is only the vibrations that are moving the rod and vibrations only that produce the sound.

Have a look at all those videos on youtube entitled ''hard drive loudspeakers''. It's the same thing.

As soon a something like a light plastic cup is glued on to the bearing arm of the hard drive the sound increases in volume.

You will also notice a side by side movement of the cups which includes lots of minor rotations that are more difficult to see as they are minute compared to the longer bass wavelengths.

Replace the cups with a vertical rod, supported at the top as well as the bottom and you have the Planot clone as demonstrated in Julians video.

Last edited by ziggyr; 9th August 2012 at 12:38 AM.
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Old 9th August 2012, 08:43 AM   #229
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Originally Posted by ziggyr View Post
It is NOT the rotation that is causing ''pressure waves'' or anything like that.That is ridiculous!
It is only the vibrations that are moving the rod and vibrations only that produce the sound.
Yet, reading the patent, to me it seems that the rotation causing pressure waves is what is patented. Did I misunderstand that?

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Old 9th August 2012, 09:13 AM   #230
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Jan: The claim reads:

Quote:
A diaphragm for a rotary loudspeaker driver which radiates sound at all frequencies in its range in a 360 degree horizontal pattern and can function as a full-range driver or can be implemented as a limited frequency range driver and that eliminates phase cancellation (a) comprising the diaphragm structure with sides which have parallel and straight edges and the edges of each of these sides are parallel with the central axis of rotation, each of these sides being a simple rectangle, and the diaphragm's cross section has at least three equal sides and which is light and rigid (b) the diaphragm has a structure on both ends of its axis for attaching bearings and one or more electric motors to a rigid structure or frame (c) the diaphragm that has at least three sides and when rotated along its central axis creates a positive pressure in the surrounding medium on all sides parallel to the axis of rotation and is not subject to phase cancellation of front and back waves (d) the diaphragm in which the width of each side is equal to the width of the wavelength of the highest frequency that is to be radiated uniformly in the horizontal plane (e) whereby the diaphragm may radiate sound evenly at all frequencies within its range in a horizontal 360 degree pattern and vertically along its entire length. (italics mine- SY)
As a note, in order to infringe, ALL elements of the claim must be present.
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