What is the symbol for a mic? - 1 attachment
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From: Archimedes' Lever on 31 Oct 2009 14:43 On Sat, 31 Oct 2009 13:26:18 -0500, Lostgallifreyan <no-one(a)nowhere.net> wrote: >Archimedes' Lever <OneBigLever(a)InfiniteSeries.Org> wrote in >news:gutoe5tbnf9deb8u1o9o3uc3fu6u1p5kjt(a)4ax.com: > >> On Sat, 31 Oct 2009 12:40:33 -0500, Lostgallifreyan <no-one(a)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
From: Proteus IIV on 10 Nov 2009 20:53
On Oct 31, 12:14 pm, Archimedes' Lever <OneBigLe...(a)InfiniteSeries.Org> wrote: > On Sat, 31 Oct 2009 11:39:09 -0500, Lostgallifreyan <no-...(a)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 GOOD LUCK I AM PROTEUS |