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Room acoustics and speakers obsolete?

RayDunzl

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#3
I see plenty of press releases and speculation.

I see patents.

I don't see user reviews or measurements.

(I get to be wrong)
 
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J

JustJones

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Thread Starter #4
Isn't it used in wifi? Or is that something different. I'm usually wrong.
 

phoenixdogfan

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#6
Would be just the thing for people living in smaller spaces in close proximity to others also living in smaller spaces--especially if they're armed.
 

RayDunzl

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#7

win

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#8
Would be just the thing for people living in smaller spaces in close proximity to others also living in smaller spaces--especially if they're armed.
if only there was such a discreet, personal solution already available to this problem...
 

RayDunzl

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#9
Found this paper on beaming sound:

"Sound From Ultrasound: The Parametric Array as an Audible Sound Source"

https://core.ac.uk/download/pdf/4393713.pdf



1605380259317.png



It would seem to require a bit of EQ to approach flat:

1605380572917.png




12dB/octave sloping down from the lows to approach "flat" as I read it... it probably won't go low.



1605380918758.png




1605381010182.png



10% THD at 1kHz at 72dB or so.


I suppose that today (20 years later) there has been some improvement in results, but sometimes it's hard to trick mother physics...
 
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Patrick1958

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#10
Couple years ago there were two men in the show "Invent it rich" who developed an alarm clock with beaming sound.
 

win

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#12
I made a joke earlier but seriously, headphones exist already guys
 

PaulD

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#14
I have used these things (2 different kinds / manufacturers) in museum installations, and the fidelity is truly awful. Last time I heard one was 2-3 years ago, so unless they have improved a LOT, this will not change what we are doing. PA line array technology and beam-steering is much more likely to make it into home audio sooner than these things.
 

waynel

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#16
I've heard the Turtle Beach version. It's a neat trick but sound quality was terrible.
 
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