We've posted several times about blind people who have learned how to "see" and navigate the world using echolocation like bats, shrews, and whales. In the video above, YouTuber Molly Burke and echolocation educator Brian Bushway, who are both blind, try to teach It's Okay To Be Smart's Dr Joe Hanson, who is sighted, the fundamentals of this extraordinary skill.
Security research Matt Wixey from PWC UK tried putting different kinds of consumer speakers -- noise canceling headphones, smart speakers, parametric speakers -- in an anechoic chamber after infecting them with malware that caused them to emit tones beyond those intended by the manufacturer. Read the rest
"There was a phantom beep going off somewhere in my house, driving me nuts," says Steve Onotera. "So using my audio engineering skills I set about to track it down." Read the rest
These Edifier R1700BT speakers are perfect for my home office and bedroom. Read the rest
Researchers at MIT's Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can "transmit various tones, music and recorded speech at a conversational volume" to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don't. Conspiracy theorists, start your engines. From the Optical Society of America:
"Our system can be used from some distance away to beam information directly to someone's ear," said research team leader Charles M. Wynn. "It is the first system that uses lasers that are fully safe for the eyes and skin to localize an audible signal to a particular person in any setting..."
The new approaches are based on the photoacoustic effect, which occurs when a material forms sound waves after absorbing light. In this case, the researchers used water vapor in the air to absorb light and create sound...
One unique aspect of this laser sweeping technique is that the signal can only be heard at a certain distance from the transmitter. This means that a message could be sent to an individual, rather than everyone who crosses the beam of light. It also opens the possibility of targeting a message to multiple individuals.
"New technology uses lasers to transmit audible messages to specific people" (Phys.org via The Daily Grail)
"Photoacoustic communications: delivering audible signals via absorption of light by atmospheric H2O" (Optics Letter) Read the rest
For the first time, we can hear the "sounds" of wind on Mars as captured by the scientific instruments on NASA's InSight robotic lander. From NASA:
"Capturing this audio was an unplanned treat," said Bruce Banerdt, InSight principal investigator at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California...
Two very sensitive sensors on the spacecraft detected these wind vibrations: an air pressure sensor inside the lander and a seismometer sitting on the lander's deck, awaiting deployment by InSight’s robotic arm. The two instruments recorded the wind noise in different ways. The air pressure sensor, part of the Auxiliary Payload Sensor Subsystem (APSS), which will collect meteorological data, recorded these air vibrations directly. The seismometer recorded lander vibrations caused by the wind moving over the spacecraft's solar panels, which are each 7 feet (2.2 meters) in diameter and stick out from the sides of the lander like a giant pair of ears.
image: "One of two Mars InSight's 7-foot (2.2 meter) wide solar panels was imaged by the lander's Instrument Deployment Camera, which is fixed to the elbow of its robotic arm." (NASA/JPL-Caltech)
Remember the stories over the past year or so about mysterious attacks at U.S. embassies harming diplomatic staff and their families? William J. Broad's story in the New York Times today reports that doctors and scientists are now coming to the conclusion that microwave weapon strikes capable of causing “sonic delusions” and brain damage are to blame. Read the rest
Colored sand, a Chladni plate, and a little Bach make for a very soothing demonstration of cymatics. Read the rest
NASA scientists listen to the low-frequency pulsing hum of the Sun to gain insight into the star's atmosphere over time. The raw data comes from the ESA (European Space Agency) and NASA’s Solar and Heliospheric Observatory (SOHO) launched back in 1995. Researchers from Stanford Experimental Physics Lab then process and filter the data and speed it up "a factor 42,000 to bring it into the audible human-hearing range."
From NASA:
“Waves are traveling and bouncing around inside the Sun, and if your eyes were sensitive enough they could actually see this,” said Alex Young, associate director for science in the Heliophysics Science Division at NASA’s Goddard Space Flight Center in Greenbelt, Maryland...
Data from SOHO, sonified by the Stanford Experimental Physics Lab, captures the Sun’s natural vibrations and provides scientists with a concrete representation of its dynamic movements.
“We don’t have straightforward ways to look inside the Sun. We don’t have a microscope to zoom inside the Sun,” Young said. “So using a star or the Sun’s vibrations allows us to see inside of it..."
These vibrations allow scientists to study a range of complex motions inside the Sun, from solar flares to coronal mass ejections.
“We can see huge rivers of solar material flowing around. We are finally starting to understand the layers of the Sun and the complexity,” Young said. “That simple sound is giving us a probe inside of a star. I think that’s a pretty cool thing.”
In 1997, the National Oceanic and Atmospheric Administration recorded "the bloop," a one-minute sound emanating 1,500 miles west of Chile's southern coast. The unexplained sound was never recorded again. Read the rest
Last week, I posted about The Sounds of the Office, a 1964 vinyl record released by Folkways Records of field recordings by Michael Siegel. This week, it's The Sounds of the Junk Yard, another 1964 Folkways collection of Siegel's field recordings, ranging from an Acetylene Torch to Alligator Shears to a Paper Baler.
Moses Asch founded the incredibly influential Folkways Records label in 1948 to record and share music and sounds from around the world. Along with bringing the music of Woody Guthrie, Pete Seeger, Lead Belly, and Elizabeth Cotten to wider audiences, Folkways, acquired in 1987 by Smithsonian, also issued incredible sound recordings from the Ituri rainforest, Navajo Nation, Peru, and many other locations and indigenous peoples across the globe. (In fact, the label provided several tracks for the Voyager Golden Record, now 12+ billion miles from Earth! Researching that project with my partner Tim Daly, a DIY musicologist himself, I've become absolutely enchanted by Folkways. If any of you dear readers have Folkways LPs collecting dust, I'd give them a wonderful home.)
Along with music, Folkways released LPs with poetry, language instruction, nature sounds (frogs! insects), and other field recordings. The Sounds of the Junk Yard reminds me of an Einstürzende Neubauten album but was issued a decade before the birth of "Industrial Music" was born.
"Some junk yard equipment is common to all of them, some is more specialized," wrote Siegel in the album liner notes. "All these sounds were recorded in yards in Warren, Pennsylvania."
Hear more samples at the Smithsonian Folkways page here. Read the rest
Art collective The Principals put together Sound Journeys, an immersive multimedia project focusing on how sounds shape human response to environment. Read the rest
Annoying song stuck in your head? This BrainCraft video explains that listening to it from beginning to end may free you from its burden. It's a technique based on the Zeigarnik effect, the tendency we have to remember things which are uncompleted.
To try it yourself, listen to this first:
Several years back, we posted about the wonderful site youarelistening.to, a strangely soothing mix of ambient music and police radio chatter (!) from various cities. Youarelistening.to isn't the only source of lovely and relaxing field recordings and ambient noise though. Here are a few of DIGG's favorites:
If your cup of coffee isn't giving you the kick you need, flipping on Coffitivity might be a good next step. Coffivity provides the cozy and comforting sounds of a cafe (which can help you focus according to scientific research) in six flavors, including Paris Paradise, Texas Teahouse, and Brazil Bistro.
Mimicking the sounds of the room in the house where everyone does their best thinking, Virtual Shower also boasts a temperature setting that changes the color of the page. You can't hear it, but you'll know it's there.
Blazing Logs Another simple one. Flip this year-round-yule log on to hear the crackle of a fire and not much else.
"The Most Relaxing Ambient Sound Sites On The Internet" (DIGG) Read the rest
This remarkable demonstration of a pigeon, a falcon, and an owl flying past six extremely sensitive high-end microphones shows just how quiet owls are when they fly. Read the rest
Carryl Baldwin, a professor of cognition and applied auditory research, designs and tests sounds for "use as alarms in household, aviation, medical, and automotive settings." Atlas Obscura explores the art and science of making sounds that convey a spectrum of urgency:
One of the main considerations is the annoyance factor. To test for annoyance in the lab, says Baldwin, “we’ll construct sounds and we’ll look at all of the different acoustic parameters, so we might vary, for instance, intensity, frequency, the number of harmonics, how fast it ramps up and down, the temporal characteristics—like whether it’s going d-d-d-d-d-duh rapidly or duhhhh-duhhhhh-duhhhh.”
The faster an alarm goes, the more urgent it tends to sound. And in terms of pitch, alarms start high. Most adults can hear sounds between 20 Hz and 20,000 Hz—Baldwin uses 1,000 Hz as a base frequency, which is at the bottom of the range of human speech. Above 20,000 Hz, she says, an alarm ”starts sounding not really urgent, but like a squeak.”
Harmonics are also important. To be perceived as urgent, an alarm needs to have two or more notes rather than being a pure tone, “otherwise it can sound almost angelic and soothing,” says Baldwin. “It needs to be more complex and kind of harsh.” An example of this harshness is the alarm sound that plays on TVs across the U.S. as part of the Emergency Alert System. The discordant noise is synonymous with impending doom.
"An Alarm Designer on How to Annoy People in the Most Effective Ways" (Atlas Obscura) Read the rest
Peter Clark collaborated on this cool cymatics video for Thump, but the even cooler stuff is the camera test and the behind the scenes footage: Read the rest
