[FoRK] Active Noise Suppression for PCs
signa at birch.net
Wed Mar 17 00:05:50 PST 2004
Gordon Mohr wrote:
> About 3 years ago I wondered to fork...
> > OK, why can't PCs use active noise suppression -- the
> > generation of matched anti-noise -- for masking the
> > annoying whirrs of fans and hard-drives?
...because slashcode 3.2 has procedural quoting, and is suitable...eh?
The log from here:
0- Everyone's going to 2MHz PWM supplies anymore, and the
change at the fan to ~28kHz soft-commutation switchers cuts
the harmonic noise anyhow. (Failing one of those, just
use some sort of sturdy isolation mounting; the silicone mounts
may or may not please you.)
0.1- Couldn't they have made $400 scanners in the form of 7Mpixel,
USB2 or LVDS UW SCSI light-box cameras in the first place?
No? And because nobody buys a Kodak lens under $900? Hmph.
-Seagate HDs are quiet; or install any modern HD on A/S mats.
-You can't do that with blade computers. Off to an isolated
area with them and their many 2.5" drives!
-Putting a cone of filtration foam over a HSF settles it plenty.
-2-fan powersupplies that weigh #17 report to work great. quietly. TBA.
-suspending the HD (optionally in a $30 Zalman heatpipe
carriage) is enough. New cases offer 100% 5.25" bays to permit
this w/o metal bending.
-All is futile if any exhaust fan blows through anything other
than a wire-hoop type fan bezel. Max Payne logo also
said to do well, but at that point one prefers using pneumatic
jaws and a conformal coating on the precut grilles.
-Adding mass to fan, expecting I2C fan control on single-CPU
board makes one feel silly.
-Giant sorbothane feet indeed less obtrusive than 8 tennisballs
epozied under ea. boxen. Minorly longer errand....
-Tip-magnetic-driven fans are a few dB quieter, but the thrust
bearing rattles a couple of days until it settles in.
-If any more details become important, install batts of pearmoss
around the case and get a fingerworks keyboard/mouse.
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