> On Sat, 31 Oct 2009 11:39:09 -0500, Lostgallifreyan <no-...@nowhere.net> > wrote:
>>Given that it was a while before anyone invented any kind of high quality >>directional mic after the spherical omni type moving coil mic, it's not >>surprising that the original symbol seems to equate with omni types.
> The first one was in 1876, so I think we have had a while to play with > the engineering.
> Directional mikes (cardioid) were being used in the late 30's and the > 40's and 50's ushered in a LOT of audio gear, both in the military > channels and the commercial realm as well.
> Laser mics are cool...
> A new type of laser microphone is a device that uses a laser beam and > smoke or vapor to detect sound vibrations in free air. On 25 August 2009, > U.S. patent 7,580,533 issued for a Particulate Flow Detection Microphone > based on a laser-photocell pair with a moving stream of smoke or vapor in > the laser beam's path. Sound pressure waves cause disturbances in the > smoke that in turn cause variations in the amount of laser light reaching > the photo detector. A prototype of the device was demonstrated at the > 127th Audio Engineering Society convention in New York City from 9 > through 12 October 2009.
> Very fresh!
Yep, I'm sort of watching that space too. At first I thought it wouldn't be viable, horrible SNR etc, but I was told (by Phil Hobbs I think) that it worked fine, so I'm likely to want to play with one at some point. /dreaming
Also given the high energy density that powerful lasers can make, I wonder if the idea might be reversible somehow. Plasma tweeters never really took off (too expensive maybe), and plasma wide-range speakers maybe don't even exist except as a kind of audiophile monument that is about as out-of-reach as a Cray computer was for most of the last few decades. I wonder if some kind of laser might put enough modulated energy into a tiny space to make it work though. But this is the very loosest kind of wondering, I really haven't a clue if it would work well, or what other ways might be better.
> On Sat, 31 Oct 2009 12:40:33 -0500, Lostgallifreyan <no-...@nowhere.net> > wrote:
>>Plasma tweeters never really took off >>(too expensive maybe),
> The military has eximer lasers that can punch a dent in a missile body > in flight.
> So, maybe a variant of a ribbon tweeter, where photons impinge on the > ribbon backside, causing emission on the face of it.
But with some vicious harmonic distortion. :) I was thinking of some kind of gas state only, or actual plasma, just not derived from HV. A small Q- switched YAG like the Abrams tank rangefinders can, if focussed, make a snapping sound as it burns the air (and a flash at focal point). Maybe if there was some way to control it... But I bet it would end up just as unfeasible and dangerous as doing it with HV. And probably harder to do. Might not need huge peak power at all though, if a few hundred watts could be focussed onto some fluid that can then have its rate of expansion modulated. Anyway, I'll leave it there, I'm going to sleep. And I also know that people in alt.lasers (and likely Phil Hobbs who haunts here and there too) would have talked about this if it was anything like viable. Besides, I think the idea that uses a closed, sealed Helmholtz resonator as a kind of fridge is cooler. Totally strange and wonderful idea, to use sound as a heat pump.
>> On Sat, 31 Oct 2009 12:40:33 -0500, Lostgallifreyan <no-...@nowhere.net> >> wrote:
>>>Plasma tweeters never really took off >>>(too expensive maybe),
>> The military has eximer lasers that can punch a dent in a missile body >> in flight.
>> So, maybe a variant of a ribbon tweeter, where photons impinge on the >> ribbon backside, causing emission on the face of it.
>But with some vicious harmonic distortion. :) I was thinking of some kind of >gas state only, or actual plasma, just not derived from HV. A small Q- >switched YAG like the Abrams tank rangefinders can, if focussed, make a >snapping sound as it burns the air (and a flash at focal point). Maybe if >there was some way to control it... But I bet it would end up just as >unfeasible and dangerous as doing it with HV. And probably harder to do. >Might not need huge peak power at all though, if a few hundred watts could be >focussed onto some fluid that can then have its rate of expansion modulated. >Anyway, I'll leave it there, I'm going to sleep. And I also know that people >in alt.lasers (and likely Phil Hobbs who haunts here and there too) would >have talked about this if it was anything like viable. Besides, I think the >idea that uses a closed, sealed Helmholtz resonator as a kind of fridge is >cooler. Totally strange and wonderful idea, to use sound as a heat pump.
I never said a damned thing about HV. And high powered lasers hardly become a candidate for something that you want to derive high electrical efficiency from as it relates to a simple audio transducer.
If ribbon tweeters currently work, and they do, I see no difference between motivating them they current way, or by using photon impingement. It would NOT be focused, It would be a huge spot. Same number of photons, but spread out
> >> On Sat, 31 Oct 2009 12:40:33 -0500, Lostgallifreyan <no-...@nowhere.net> > >> wrote:
> >>>Plasma tweeters never really took off > >>>(too expensive maybe),
> >> The military has eximer lasers that can punch a dent in a missile body > >> in flight.
> >> So, maybe a variant of a ribbon tweeter, where photons impinge on the > >> ribbon backside, causing emission on the face of it.
> >But with some vicious harmonic distortion. :) I was thinking of some kind of > >gas state only, or actual plasma, just not derived from HV. A small Q- > >switched YAG like the Abrams tank rangefinders can, if focussed, make a > >snapping sound as it burns the air (and a flash at focal point). Maybe if > >there was some way to control it... But I bet it would end up just as > >unfeasible and dangerous as doing it with HV. And probably harder to do. > >Might not need huge peak power at all though, if a few hundred watts could be > >focussed onto some fluid that can then have its rate of expansion modulated. > >Anyway, I'll leave it there, I'm going to sleep. And I also know that people > >in alt.lasers (and likely Phil Hobbs who haunts here and there too) would > >have talked about this if it was anything like viable. Besides, I think the > >idea that uses a closed, sealed Helmholtz resonator as a kind of fridge is > >cooler. Totally strange and wonderful idea, to use sound as a heat pump.
> I never said a damned thing about HV. And high powered lasers hardly > become a candidate for something that you want to derive high electrical > efficiency from as it relates to a simple audio transducer.
> If ribbon tweeters currently work, and they do, I see no difference > between motivating them they current way, or by using photon impingement. > It would NOT be focused, It would be a huge spot. Same number of > photons, but spread out- Hide quoted text -
> - Show quoted text -
YOU ARE AN IDIOT
SHUT THE FUCKUP ALREADY YOU FUCKING FUCKTARD
TAKE YOUR FANTASY ANUS OUT OF HERE AND QUIT SPREADING YOUR ANAL IDIOCY IN THIS GROUP
> Google is so screwed up anymore that it isn't funny.
I just had a momentary glimpse of how deep THAT rabbithole goes, and it's not an edifying view!
[quote] Sponsored Links
How to Make Electricity $200 DIY kit has electricity co's Exec calling for a ban on its sale. www.Power4Home.com [/quote]
This thing turns out to be a direct scam, credit card fraud, pure and simple, as Google's own searches will quickly reveal. Google included that as a sponsored link, and worse, they obscured it so the actual link above (the URL isn't the actual link, the "How To Make Electricity" is the link text) doesn't appear in the status bar of a browser when the pointer hovers over it. Further, it contains so much encrypted session-based tracking stuff, AND a payload for the script at the scammer's end appended to their own URL buried in Google's long link.
As far as I'm concerned, with this single move, Google just degenerated into the role of a pimp and procurer of victims for crime, knowing exactly what they do, so that makes them criminals too.
I wonder who this might be reported to, to have a significant effect. I think maybe the old blind eye won't do, now. Google wil say it does, for a while, but given enough reports they'll soon get clobbered enough to make them stop profiting from this degeneration.
>> Google is so screwed up anymore that it isn't funny.
> I just had a momentary glimpse of how deep THAT rabbithole goes, and > it's not an edifying view!
> [quote] > Sponsored Links
> How to Make Electricity > $200 DIY kit has electricity co's Exec calling for a ban on its sale. > www.Power4Home.com > [/quote]
> This thing turns out to be a direct scam, credit card fraud, pure and > simple, as Google's own searches will quickly reveal. Google included > that as a sponsored link, and worse, they obscured it so the actual link > above (the URL isn't the actual link, the "How To Make Electricity" is > the link text) doesn't appear in the status bar of a browser when the > pointer hovers over it. Further, it contains so much encrypted > session-based tracking stuff, AND a payload for the script at the > scammer's end appended to their own URL buried in Google's long link.
> As far as I'm concerned, with this single move, Google just degenerated > into the role of a pimp and procurer of victims for crime, knowing > exactly what they do, so that makes them criminals too.
> I wonder who this might be reported to, to have a significant effect. I > think maybe the old blind eye won't do, now. Google wil say it does, for > a while, but given enough reports they'll soon get clobbered enough to > make them stop profiting from this degeneration.
Oh, and just to head off the chance of a bit of trolling, I clicked the link not because I beleive in it, but because it's a source of endless fascination to me what kinds of crap people come up with to try to convince the public that they have some kind of magic tech. Didn't even see it this time, just a long "but wait there's even more" infomercial caricature. I think someone mentions a couple of solar panels and a windmill... Whole thing makes Arthur Daley look like very high class.
>>> Google is so screwed up anymore that it isn't funny.
>> I just had a momentary glimpse of how deep THAT rabbithole goes, and >> it's not an edifying view!
>> [quote] >> Sponsored Links
>> How to Make Electricity >> $200 DIY kit has electricity co's Exec calling for a ban on its sale. >> www.Power4Home.com >> [/quote]
>> This thing turns out to be a direct scam, credit card fraud, pure and >> simple, as Google's own searches will quickly reveal. Google included >> that as a sponsored link, and worse, they obscured it so the actual >> link above (the URL isn't the actual link, the "How To Make >> Electricity" is the link text) doesn't appear in the status bar of a >> browser when the pointer hovers over it. Further, it contains so much >> encrypted session-based tracking stuff, AND a payload for the script >> at the scammer's end appended to their own URL buried in Google's >> long link.
>> As far as I'm concerned, with this single move, Google just >> degenerated into the role of a pimp and procurer of victims for >> crime, knowing exactly what they do, so that makes them criminals >> too.
>> I wonder who this might be reported to, to have a significant effect. >> I think maybe the old blind eye won't do, now. Google wil say it >> does, for a while, but given enough reports they'll soon get >> clobbered enough to make them stop profiting from this degeneration.
> Oh, and just to head off the chance of a bit of trolling, I clicked > the link not because I beleive in it, but because it's a source of > endless fascination to me what kinds of crap people come up with to > try to convince the public that they have some kind of magic tech. > Didn't even see it this time, just a long "but wait there's even more" > infomercial caricature. I think someone mentions a couple of solar > panels and a windmill... Whole thing makes Arthur Daley look like very > high class.
Mr Daley was a class act. :o That will confuse those at the other side of the pond ! :-)
<OneBigLe...@InfiniteSeries.Org> wrote: > On Sat, 31 Oct 2009 11:39:09 -0500, Lostgallifreyan <no-...@nowhere.net> > wrote:
> >Given that it was a while before anyone invented any kind of high quality > >directional mic after the spherical omni type moving coil mic, it's not > >surprising that the original symbol seems to equate with omni types.
> The first one was in 1876, so I think we have had a while to play with > the engineering.
> Directional mikes (cardioid) were being used in the late 30's and the > 40's and 50's ushered in a LOT of audio gear, both in the military > channels and the commercial realm as well.
> Laser mics are cool...
> A new type of laser microphone is a device that uses a laser beam and > smoke or vapor to detect sound vibrations in free air. On 25 August 2009, > U.S. patent 7,580,533 issued for a Particulate Flow Detection Microphone > based on a laser-photocell pair with a moving stream of smoke or vapor in > the laser beam's path. Sound pressure waves cause disturbances in the > smoke that in turn cause variations in the amount of laser light reaching > the photo detector. A prototype of the device was demonstrated at the > 127th Audio Engineering Society convention in New York City from 9 > through 12 October 2009.
> Very fresh!
WHATEVER YOU DO OP EDDIE DO NOT LISTEN TO THIS TROLL ARCIHIONMEDS
HE IS A TROLL BUT NO BETTER NOR LATGER IN LIFE THAN A TURKEY HE SHOULD BE FROZEN IN HIS TRAX COME THIS THANKSGIVING BAISTED AND ROASTED FOR THE GROUPS ENJOYMENT
HE ALWAYS LIKES MAKING FUN AND FLAMING ANYONE HE FEELLS RANCHY OVER WITH HIS ANAL COMMENTARIES INSULTS AND INNANE INPUT SO IT IS ONLY FAIR WE COOK HIM WELL
WITH ALL THE SALMONELA AND FOOD POISONING GOING AROUND FROM HIS KIND AND ALL IT IS RIGHT AND JUST
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