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Building a Parametric Speaker Array?

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newRocky

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Hello guys,
I want to build something very similar to what is shown in this video:

Three-Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation] (2013,2014-) - YouTube

You guys have a thread with a tangential discussion over here: DIY Parametric speaker (in kit form).[http://laserpointerforums.com/f60/diy-parametric-speaker-kit-form-87191.html]

Where do you suggest I can start?
I am not sure as to what acoustic transducer I could use.
I know a PCB could be designed, and I can solder all the components to it.

Yet controlling the transducers… any thoughts on that?
Any general direction you can send me, to very and check for additional information?

Thank you everyone very much for your help… it is very much appreciated!

-Rocky


EDIT:
Sorry, left that initial post half-baked.
I know the 3D movement can later be done by controlling on/off different transducers, and modifying the phase of them.

Looking at the table from top, I the xy axis would be flat, and the z axis would be vertical.
Well, I think that xy movement can be achieved by modifying the phase of the transducers.
And z movement can be done by turning on/off transducers in order to move the "node" up/down.

At least, that's where I am standing now in my rough mental draft.
Any ideas?
 
Last edited:





newRocky said:
Hello guys,
I want to build something very similar to what is shown in this video:

Three-Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation] (2013,2014-) - YouTube

You guys have a thread with a tangential discussion over here: DIY Parametric speaker (in kit form).[http://laserpointerforums.com/f60/diy-parametric-speaker-kit-form-87191.html]

Where do you suggest I can start?
I am not sure as to what acoustic transducer I could use.
I know a PCB could be designed, and I can solder all the components to it.

Yet controlling the transducers… any thoughts on that?
Any general direction you can send me, to very and check for additional information?

Thank you everyone very much for your help… it is very much appreciated!

-Rocky


EDIT:
Sorry, left that initial post half-baked.
I know the 3D movement can later be done by controlling on/off different transducers, and modifying the phase of them.

Looking at the table from top, I the xy axis would be flat, and the z axis would be vertical.
Well, I think that xy movement can be achieved by modifying the phase of the transducers.
And z movement can be done by turning on/off transducers in order to move the "node" up/down.

At least, that's where I am standing now in my rough mental draft.
Any ideas?
Click to expand...

We already have a post on that here.
See below.http://laserpointerforums.com/f60/diy-parametric-speaker-kit-form-87191.html
 
Last edited:
newRocky said:
Well, I did see your thread... it's that's the reason I posted in these forums initially and why I linked to it above.

Yet I don't see your thread as a "build thread".

In this one I want to post my progress on how I go, and how it's working out step by step.

Yet, if you want to do it over there, that's fine by me.
Click to expand...

You were asking "where do I start".... the answer is on the link above.
the Acoustic levitation (not a perimetric speaker) device requires a MUCH higher input power and at least a
40-60W transducer. IF you watch the video you'll see what is required to build one.

I posted quite a bit of info on that thread after seeing that PS kit from Japan.

Are you building a parametric speaker or a ultrasonic levitation device ?
 
Seoul_lasers said:
the Acoustic levitation (not a perimetric speaker) device requires a MUCH higher input power and at least a
40-60W transducer. IF you watch the video you'll see what is required to build one.
Click to expand...
That is what I figured... a much bigger/powerful transducer.

Yet not sure which one could work...
Any suggested?

Seoul_lasers said:
Are you building a parametric speaker or a ultrasonic levitation device ?
Click to expand...
I am interested in the levitation device, yet placed side-ways...
So something like what's seen in this video can be done:

http://www.youtube.com/watch?v=odJxJRAxdFU

Any thoughts?

Thank you!
 
Last edited:
newRocky said:
That is what I figured... a much bigger/powerful transducer.

Yet not sure which one could work...
Any suggested?


I am interested in the levitation device, yet placed side-ways...
So something like what's seen in this video can be done:
Three-Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation] (2013,2014-) - YouTube

Any thoughts?

Thank you!
Click to expand...

1) Fix your video code. All you need is to paste the code after the v=

2) The array with the 3 way levitation is an array made of 4 arrays of lower power transducers so that it can be controlled easier using a controller circuit.
Actually these appear to be the same/similar transducers as in the parametric speaker kit.

I'll try and see if I can dig up a Japanese document on this.
 
Last edited:
Seoul_lasers said:
1) Fix your video code. All you need is to paste the code after the v=

2) The array with the 3 way levitation is an array made of 4 arrays of lower power transducers so that it can be controlled easier using a controller circuit.
Actually these appear to be the same/similar transducers as in the parametric speaker kit.

I'll try and see if I can dig up a Japanese document on this.
Click to expand...

Thank you!
What I want to do is something similar to those little styrofoam pellets...
So maybe higher power transducers are not necessary?

As to the controller circuits... I don't have that much knowledge in electronics, so I thought to use a combination of Raspberry Pi and Arduinos.

I thought to design the transducer PCB, and then send it off to print.
Then solder everything, and start testing.
Yet obviously, HOW the transducers will go connected is something that has to be determined first before designing the PCB.

Thank you!
 
newRocky said:
Thank you!
What I want to do is something similar to those little styrofoam pellets...
So maybe higher power transducers are not necessary?

As to the controller circuits... I don't have that much knowledge in electronics, so I thought to use a combination of Raspberry Pi and Arduinos.

I thought to design the transducer PCB, and then send it off to print.
Then solder everything, and start testing.
Yet obviously, HOW the transducers will go connected is something that has to be determined first before designing the PCB.

Thank you!
Click to expand...

Nope, You may use the Arduino to control direction or something but the amplifier will require high power mosfets for a setup like the one shown in the video you attempted to post.
I suggest to do some research. I think you'll find you'll need several 100's of pulsed HFreq DC or so to drive an MMS (multi mini-speaker array).

Look at the parametric speaker circuit and you'll see what I mean.
On the levitation video I posted there is a link to a fairly straight forward high power mosfet driver.
operates ~300-500Vdc at 20-30Khz square wave. That's more than likely what will be needed for doing what you want.
Prepare for a very high price. Those transducers are about $3-5ea and you'll
be needing 300 of those.
So... cheaper to go the single/ dual transducer route.
 
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