[
http://www.prosoundnetwork.com/article/microsoft-owns-quietest-place-on-ear=
th/20077
]
> Microsoft Owns Quietest Place On Earth
>
> Redmond, WA (October 15, 2015)=97Everyone needs a quiet place to go to,
> even Microsoft. That's why the tech giant had Eckel Noise Control
> Technologies built it an anechoic chamber that recently broke the
> Guinness World Record for the Quietest Place on Earth, measuring -20.6
> dB. For context, the theoretical noise produced by Brownian motion=97the=
> random movement of particles in air=97is the quietest-known sound
> outside the vacuum of space, and is measured at -23 dB.
>
> In March 2014, Microsoft contracted with Eckel to design and build a
> new anechoic chamber for audio and device testing at its Redmond,
> Washington Audio Lab. Installation began at Building 87 in May 2014,
> under the direction of installer Viking Enterprises of Waterford, CT.
> The chamber=92s walls, ceilings and door are fitted with Eckel=92s
> sound-absorbing anechoic wedges., while anti-vibration mounts isolate
> the chamber from the rest of the building=92s foundation. Eckel
> completed the entire project=97which also included constructing two
> smaller anechoic chambers=97in July that year.
>
> Hundraj Gopal, Ph.D., Microsoft principal human factors engineer,
> explained, =93We designed this and other super-quiet
> acoustically-controlled chambers to engineer and build best-in-class
> audio products at Microsoft. We use these facilities for designing
> products like the Surface, HoloLens and Cortana, that we take great
> pride in.=94
>
> Independent tests of the main chamber by professional sound
> specialists from Br=FCel & Kj=E6r confirmed that=97at -20.6 dB=97Microsof=
t and
> Eckel had broken the previous world record of -13 dB, held by an Eckel
> anechoic chamber at Orfield Laboratories in Minneapolis.
>
> =93This chamber gives us the opportunity to look for those really small
> signals that can have an impact to the end user,=94 said LeSalle Munroe,=
> Microsoft senior engineer, surface devices. =93We always want to have
> the best tools available for the job, and that=92s what this is. It=92s a=
> great accomplishment.=94
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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