Posts Tagged ‘noise’

Random order

Using simple, functional components like DC motors, wire, and cardboard boxes, Swiss artist Zimoun assembles building blocks of motion into massive, engrossing sonic environments. An individual motor may exhibit repetitive motion and deterministic noise, but dozens of identical systems spawn complex imagery and random sound that evoke organic phenomena from wind in the grass to running water.

Zimoun’s “Sculpting Sound” is on display through January 8 at the Ringling Museum of Art in Florida, and the artist has an upcoming solo exhibition scheduled for February 2 – March 10, 2012 at Bitforms Gallery in Chelsea.

[via It’s Nice That]

What do fireworks sound like on 72nd Street?

Getting off the train at 72nd St, on the subway platform we heard a funny sound and wondered ‘what is that?’  Well, it turned out to be the sound of fireworks above for the kickoff of the NYC Marathon.  A cell phone microphone does not completely do this justice but you can hear the reflections of sound off of the building facades and the overall reverberation somewhat.

Telecool

HEARING LOOP INSTALLEDThis week the New York Times brings a promising update on the increasing adoption of the telecoil, a technology that promises to make life much easier for those with hearing impairments.  A hearing aid or cochlear implant that includes a telecoil can directly pick up the audio from a sound system, whether for a theater or a school or even a subway booth clerk’s microphone.  The signal is beamed to the telecoil via an audio induction loop of wire permanently installed in the floor; when the listener’s hearing device is trained on this signal, it eliminates the extraneous background noise and reverberation that can make intelligible listening a challenge even with a modern hearing aid.  The listener has effectively “plugged in” directly into the source—and without the social stigma that can hinder adoption of more obtrusive external listening devices.

The concept has been around for decades and is widely adopted in parts of Europe—there is a telecoil transmitter in the back seat of every London taxi—but it is only recently gaining a foothold in the US.  With the greying of the population and the fact that more than 30% of people over the age of 65 are affected by hearing loss, the ability to make clean audio directly accessible to the ear holds “clear” potential!

Catch a wave

You may know that the sounds you hear travel through the air as waves, but the invisibility of air makes this concept a tricky one to visualize.  For those who like physics demonstrations (and who doesn’t), we recently came across this video of a series of pendulums—and the pendulum is perhaps the most accessible form of wave motion we witness in everyday life.

A pendulum’s length determines its frequency, just as sound waves in air have a frequency that corresponds to pitch.  The demonstration superimposes different frequencies to illustrate traveling waves, standing waves, beats, and “random” noise, which are all phenomena that come from mixing different frequencies together.

compostable quiet

Maybe you heard about this maybe you didn’t…or maybe you heard someone next to you eating SunChips out of the old compostable but VERY NOISY bag last summer. Well, Frito Lay just recently reduced the noise that the compostable bags make.  They found that by using a more rubbery adhesive to put the bag together, the noise level dropped from around 80 to 85 decibels to around 70 decibels.  Subjectively, a 10 decibel drop is about half as loud.  So maybe now you can sneak a snack at midnight without waking up your neighbors and then bury the evidence in your compost pile.  Happy Earth Day!

AP Article

Putting the rev back in your engine

A great deal of engineering effort has gone into quieting the automobile over the past century.  In most major cities, transportation noise is a huge contributor to environmental noise both outdoors and in (who doesn’t live near a road?)  Vehicle acoustics is a primary focus of many current applied acoustics research programs, with the enthusiastic support of the auto industry.

Even so, some would argue that these great successes in reducing vehicle noise have come at the expense of exhilaration; gunning your engine at a stop light just doesn’t give the thrill that it did in the days of the big block V8.

SoundRacer in actionFor those of us that would occasionally like to hear what we’re driving (which yes, sometimes includes even noise-averse acousticians), a Swedish company has developed the SoundRacer.  This gizmo fits into your cigarette lighter socket, and using the socket voltage to sense engine RPM, broadcasts real-time sports car engine sound through your car stereo.  Even if your “sports car” happens to be less than sporting!