What is the symbol for a mic?

Which were generally omni. The symbol, at one time, most certainly did have variants that related DIRECTLY to the type of mic.

Archimedes' Lever wrote in news: snipped-for-privacy@4ax.com:

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. Until the ribbon mic was invented there was no real distinction to be made. Anyway, given the huge size, even the 'omni' mics of that time were all cardioid to some extent, you won't see a good quality true omni until you get below 6 mm capsule size, as used for specialised metering (and probably cheaply enough by now in electret type). I looked for symbols and didn't find them relating to polar patterns at all, though I did find several relating to transducer type. An electronic schematic symbol doesn't need to specify acoustic responses and details like resonant cavities in microphone bodies.

If you want to debate this go look deeper at it first. If you chose the other course of finding as many ways to call me a fucktard as you can, you're going on the plonk file because there's piss poor entertainment to be had from that after the first time.

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!

Archimedes' Lever wrote in news: snipped-for-privacy@4ax.com:

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.

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.

Archimedes' Lever wrote in news: snipped-for-privacy@4ax.com:

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

"Michael A. Terrell" wrote in news:i72dneEn8oLL_HbXnZ2dnUVZ snipped-for-privacy@earthlink.com:

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.

[/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.

Lostgallifreyan wrote in news:Xns9CBE6A90BD7A3zoodlewurdle@216.196.109.145:

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.

THANKS TO ALL WHO HELPED!

Eddie (OP)

y

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