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Old 6th September 2013, 08:35 PM   #11
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Despite what the guy says the physics of the mechanical/air interface still follow the same rules. These are essentially an x by y array (32x32?) of tiny speakers, they may be driven differently than a typical VC driver but they still (at least based on the illustration) are a piston with a suspension.

dave
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Old 6th September 2013, 09:37 PM   #12
adason is offline adason  United States
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Quote:
Originally Posted by afa View Post
This link just arrived in my inbox, Audio Pixels Limited - Audio Pixels Limited and here is a promotional video on you tube, https://www.youtube.com/watch?v=G47q4vU3Fr8 looks mighty impressive , any thoughts?
hardly...I would like to see that little chip produce the same low frequencies as 1000x bigger woofer...those guys are just full of BS!
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Old 6th September 2013, 10:21 PM   #13
gpapag is offline gpapag  Greece
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For those interested on the technical details of their main idea:

Apparatus and methods for generating pressure waves

(there are eleven US patent applications from them)

George
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Old 7th September 2013, 01:18 AM   #14
Enzo is offline Enzo  United States
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I think the operative phrase is this:
Quote:
good quality sound in a form factor that is far more compliant with current device and lifestyle trends.
Lifestyle trends are to walk around with your nose buried in a smart phone or other similar little screen. COnventional speakers are tough to stick into something 7mm thick. Even a laptop is tough to get convincing sound out of.

Just an opinion, but if they could make a larger area of the panels able to emit sound, it might well improve the crappy sound that currently comes out of cell phones.

I don't think they expect to replace my JBL L-100s.
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Old 7th September 2013, 01:34 AM   #15
adason is offline adason  United States
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those people completely forgot about headphones...I was listening to that youtube video, by my headphones, thinking how great he sounds, big deep voice, when he enounced how pathetic it must sound on todays devices, when they purposely cut the lows out and even added phase distortion, f#ck that, I thought, have you guys ever heard about good headphones?; I guess not...since I am not registered youtuber, I could not leave the comment, but I left thumbs down...we all should
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Old 7th September 2013, 02:14 AM   #16
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This page shows the stock price near the top:
Audio Pixels Limited - Audio Pixels Limited
They jumped from$3.87 to $5.15
I can see how this could be useful in phones as it can be soldered directly to the pcb, but there is no way a few chips can do bass or even mid at any volume as the effective cone motion is so small
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Old 7th September 2013, 09:37 PM   #17
gpapag is offline gpapag  Greece
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Quote:
Originally Posted by davidsrsb View Post
They jumped from$3.87 to $5.15
Every step they make toward a functional product now, will raise the stock price exponentially.

I read their main patent.
They are on the right track.

In my ex professional life I have experienced the evolutionary steps from a single transducer to arrays of transducers, to phase arrays of transducers. (The later -for non moving transducers- means focusing in space and steering the combined beam for to control directivity and polar response in all planes.)
That was with ultrasonic testing (1MHz-50MHz) and with Eddy Current testing (1kHz-10MHz)
The problems that had to be solved in these technologies made many to be skeptical of the outcome, considering transducers dimensions, inter spacing and beam interactions relative to the very small wavelengths involved.
But all problems were solved and the results closely matched the theoretic predictions.

Phase array technology has most of it’s problems already worked out and tested in critical and demanding sectors of technology (medical, nuclear, aerospace)
It is a mature technology, a powerful and flexible tool. Stepping (down) toward audio was to be expected .
It only has to be integrated in a mass-produced form for to become low priced.

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Originally Posted by gpapag View Post
As usual, the revolutionary wave will come through the mass gadget market and will hit the white elephants with a delay.
The research going on now aims toward how existing theoretical knowledge can be cheaply (mass manufacturing) embedded into small size products with low power demands.
The elephants will serve later as repackagers of “delux” oversized versions of the same (save some fancy names and appropriate de-mything).
The technological products will be cheap nevertheless and widely available (or just because of this. Remember, video card, sound card…)
George
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Last edited by gpapag; 7th September 2013 at 09:39 PM.
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Old 8th September 2013, 03:08 AM   #18
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Then there is the prior art.
Bones Hi - Fi: Digital Loudspeakers: Viable Hi-Fi Technology?
The famous digital speaker April fool article, actually published by Stan Curtis back in 1998, which describes the basic technology used by these Australians closely
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Old 8th September 2013, 01:38 PM   #19
gpapag is offline gpapag  Greece
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Nothing stems out from the cold.
If you are talking about acoustic MEMS, there is prior knowledge and art but it’s not where you site.
It’s with the MEMS companies dealing with hearing aids and microphones.
There are many (*), some have the knowledge, some have the markets and the money (0.5 -1 billion MEMS microphones for mobile devices per year), thus, a lot of take-overs and acquisitions happens there.


George

(*) A few that I traced:
Analog Devices, Akustika, Bosch Sensortec, Freescale, Infineon, Knowles Acoustics, Omron, STMicroelectronics, Sonion, Wolfson Microelectronics,
China: AAC Acoustic Technologies (Shenzhen) Co. Ltd. Shangdong Goer Acoustics Technology Co. Ltd, Suzhou MEMSensing Microsystems Co. Ltd.
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Last edited by gpapag; 8th September 2013 at 01:42 PM.
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Old 13th September 2013, 10:30 PM   #20
Pano is offline Pano  United States
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Interesting technology. I see only the chip as new. I built devices like this (direct digital to the air) back in 1990. That's what got me interested in Class-D amps. Alas the non-linearity of air bit me in butt. It's a cool idea, but difficult to make practical.
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