Anechoic

86 ms·

751.
by Anechoic 14y ago
It's all waves. EM waves vs pressure waves, they're not the same thing (although the math is basically the same, just with different constants). Something that affects an EM wave won't necessarily affect a pressure wave - a Faraday cage f
752.
by Anechoic 14y ago
BTW, Ron Sauro at NWAA Labs ( http://nwaalabs.com/ or http://nwaalabs.ipower.com/pictures1.html ) was hoping to build a quieter chamber but his funding dried up. He built his acoustical testing facility at a nuclear plant that was constru
753.
by Anechoic 14y ago
Perfectly diffuse rooms are a common staple of acoustics labs in university and calibration facilities, it's a requirement for STC (sound transmission class) testing for building materials and wall/window assemblies. Any acoustically well
754.
by Anechoic 14y ago
Reverb rooms are much easier to build (and more common) than very-quiet anechoic chambers.
755.
by Anechoic 14y ago
However, it looks that that room actually has a regular floor Look carefully at the picture, he's not standing on a solid floor, he's standing on a wire frame over more absorbers. Their website has a better pic: http://www.orfieldlabs.co
756.
by Anechoic 14y ago
I'd certainly enjoy a break from the incessant yammering of humanity. It's not just a break from humanity, it's a break from everything (including nature, which typically fills the void when humanity is absent). If you haven't been in a
757.
by Anechoic 14y ago
I spent the last few minutes poking around StreetView looking for a photo of the units I'm thinking of without luck In my city I know that they periodically move the units so it may be that they were moved when the pics were taken. but a
758.
by Anechoic 14y ago
They are small, white/pale-grey boxes about 4 inches square by 2 inches deep. Are you sure about that? That doesn't jibe with the picture I've seen ( http://i.imgur.com/XBevy.jpg ) and doesn't sound optimal for an acoustic transducer.
759.
by Anechoic 14y ago
@mbell & @keypusher - they don't do maintenance on every inch of track every night, but I've spent a lot of time working on the T after hours and there is always some maintenance activity happening on all the lines (even if it's just tr
760.
by Anechoic 14y ago
My city (Springfield MA) has a shotspotter system, and even though I have pretty high-up contacts among Springfield PD who know that my interest in the system is purely academic (I'm an acoustical consultant) they wouldn't reveal to me any
761.
by Anechoic 14y ago
> Keep The T open until three or four, so busy entrepreneurs can get home for a few hours of sleep. Not gonna happen for the rail transit modes, the down time is necessary so maintenance and track inspection can happen (the T isn't li
762.
by Anechoic 14y ago
Manufacturing is actually as respectable as engineering Small nit: manufacturing is engineering. Integrating manufacturing into the electrical/mechanical/software engineering process makes good sense.
763.
by Anechoic 14y ago
As computers permeate more of our everyday lives it becomes necessary to understand them on some level. You can say the same thing about any number of technologies that permeate our (western, and increasingly developed) lives - plumbing,
764.
High-tech system lets restaurant set noise level(sfgate.com)
5 points by Anechoic 14y ago|0 comments
765.
by Anechoic 15y ago
dsl, vdsl, fiber, u-verse, 4g are extremely location dependent (I live in a top 100 MSA and don't have access to video over any of those modes at home), and even directv/dish have certain requirements (namely clear LOS to the satellite). Fo
766.
by Anechoic 15y ago
This link: http://www.coeccc.net/Environmental_Scans/wind_scan_sw_09.pd... there are about 25,000 turbines in the USA. According to GP, 300,000/year birds are killed by wind turbines, which results in about 12 birds killed per turbine pe
767.
by Anechoic 15y ago
As noted above, 7 million birds per year, spread across 84,000 towers is about 1 bird per tower every four days. That alone isn't exactly noticeable, and given that most towers are located in out-of-the-way areas, that number of bird deaths
768.
by Anechoic 15y ago
> I don't know any Americans who are opposed to immigration. I live in a northeastern city with a significant Puerto Rican (as in people who moved here from PR) population, and there are lots of folks who are vocally calling for chang
769.
by Anechoic 15y ago
but if I meet weekly with a group of people where we discuss bombing federal buildings and how we might go about it, that's starting to get a lot more sketchy You basically just described my college experience. (or a white-hat conference)
770.
by Anechoic 15y ago
Got any sources for that? I'm interested in reading that research. Nothing specific off hand, I used to work for a firm that did aviation noise analysis and this was something I heard a lot from colleagues at the firm and other firms. A s
771.
by Anechoic 15y ago
At 70PNLdB, I doubt anyone in their car could hear it. In fact pretty much only rural quiet areas will hear it. 70 PNL dB is fairly loud, it will be very noticeable in urban areas and extremely disruptive in rural areas. 65 dB Ldn is t
772.
by Anechoic 15y ago
“Less aggressive synonyms” For the love of god, yes. I just did a search where Google conveniently decided to substitute "bike" and "bicycle" for the word "cycle" (as in "a series of repeated events") Sigh.
773.
by Anechoic 15y ago
Perhaps headphones could support them natively instead. You're basically talking about expanding the use of telecoil technology.
774.
by Anechoic 15y ago
Existing hearing aids have directional microphones, can distinguish between talking and background noise Not very well - they can perform well enough to make speech intelligible (and it doesn't take much, human hearing is geared toward re
775.
by Anechoic 15y ago
I wonder how many cities they made landmarks for? It looks like landmarks are a feature of big cities only - no love for the Basketball Hall of Fame or Springfield Armory.
776.
by Anechoic 15y ago
This came up a while back I'm sure. Yep: http://www.hnsearch.com/search#request/all&q=tablet+vide... http://www.hnsearch.com/search#request/all&q=knight+ridd...
777.
by Anechoic 15y ago
in the state of California it is illegal to give a black child an IQ test even when administered by a school psychologist as part of a professional assessment The issue is that IQ tests were found to be culturally biased against black stu
778.
by Anechoic 15y ago
I apologize in advance for the dreaded car analogy but: I'm concerned the very reason tablets will take over the PC market will also mean that tomorrow's kids' experience is very different from, and I would argue poorer than, my experience
779.
by Anechoic 15y ago
Why then do they not have people remove the batteries from their watches? Can't they also be unintentional radiators? what spa942 said. From the linked thread: "The low power in a digital watch is certainly a factor but the main thing th
780.
by Anechoic 15y ago
Therefore, due to extensive end-user testing. We have deemed all devices safe to use. Not at all: http://arstechnica.com/civis/viewtopic.php?p=22383605#p22383...

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