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Researchers tap AI in fight against elephant poachers
Cornell University's Elephant Listening Project is a research effort that tracks African forest elephants through acoustic recordings. Part of the project is geared toward conservation and tracking these elephant populations through the animals' calls helps researchers monitor their movements and, ideally, protect them from poachers. But the project generates seven terabytes of data every three months and it takes researchers up to 12 weeks to analyze the audio recordings they collect. That amount of time hampers any response to threats, but a new collaboration is using AI to analyze the data more quickly.
Sound-based liquid printing could lead to new designer drugs
Liquid printing is virtually ubiquitous thanks to inkjets, but the materials can only be so sluggish before it stops working. What if you wanted to print a biological material, or even liquid metal? That might happen soon. Harvard researchers have developed a technique that uses acoustic levitation to print droplets of materials that wouldn't normally be so accommodating, including metal and honey. The approach uses a subwavelength acoustic resonator to create a sound field that pulls substances from the printer nozzle at over 100G -- even some of the most viscous materials can't resist that tug. You can control the size of the droplets using the amplitude of the soundwaves, and place them anywhere you like.
Researchers create an acoustic cloaking device that works underwater
The concept of a cloaking device has a lot of appeal and though we're far from being able to make 3D objects invisible to the human eye, researchers continue to develop new ways in which to shield objects from other sorts of detection. At the Meeting of the Acoustical Society of America taking place this week in Minnesota, Penn State University researchers described a design they've developed that allowed a 3-foot-tall pyramid made from perforated steel plates to deflect sound waves in a way that could make it invisible to instruments like sonar.
China's acoustic probe heard sound from the Mariana Trench
A team of Chinese scientists have completed the country's first acoustic test in the Mariana Trench, and the results could lead to a breakthrough in understanding how sound is transmitted in the deepest parts of the ocean. The researchers from Northwestern Polytechnical University in Shanxi province dropped and retrieved an acoustic probe into a valley at the southern end of the trench, which is about 11 kilometers (approximately 6.83 miles) under the surface.
Ultrasound can levitate large objects
Scientists have long dreamed of using acoustic levitation to float objects, but there has been one big catch: you couldn't lift an object larger than the wavelength without being picky about what you're lifting. However, it might not be a problem going forward. Researchers in Brazil and the UK have successfully levitated a polystyrene ball 3.6 times larger than the ultrasonic waves holding it up. The trick was to create a standing wave in the gap between the transducers and the object, instead of the usual pressure node between the transducer and a reflector. You can change the angle and number of transducers without messing with the effect, and it finally creates both horizontal and vertical lift -- you don't need physical support to prevent the object from drifting sideways.
DARPA is building acoustic GPS for submarines and UUVs
For all the benefits that the Global Positioning System provides to landlubbers and surface ships, GPS signals can't penetrate seawater and therefore can't be used by oceangoing vehicles like submarines or UUVs. That's why DARPA is creating an acoustic navigation system, dubbed POSYDON (Positioning System for Deep Ocean Navigation), and has awarded the Draper group with its development contract.
ICYMI: VR Mars bus tour, self-assembling nanowire and more
#fivemin-widget-blogsmith-image-456992{display:none;} .cke_show_borders #fivemin-widget-blogsmith-image-456992, #postcontentcontainer #fivemin-widget-blogsmith-image-456992{width:570px;display:block;} try{document.getElementById("fivemin-widget-blogsmith-image-456992").style.display="none";}catch(e){}Today on In Case You Missed It: Lockheed Martin is encouraging kids to get into STEM with a Mars Experience Bus, with giant displays that look as though they're actually driving on the surface of Mars. Rice University created nanotubes that quickly self-assemble into nanowire. And Yamaha created an acoustic guitar that can store and loop back reverb and chorus sounds. We are also collectively irritated by the latest smart mattress with sensors inside, designed to catch your partner cheating, on your own mattress, when you're not at home. Ugh. As always, please share any great tech or science videos you find by using the #ICYMI hashtag on Twitter for @mskerryd.
'Acoustic cloak' could shield submarines with a cone of silence
We've seen some overly elaborate invisibility cloaks in our day, but Duke engineers have shown that lo-fi may be best for audio. After much refinement, they've developed a shield that can hide objects from sound waves thanks to a highly engineered pyramid shape and carefully placed holes. The stacked layers retard sound coming from any angle, so that it appears to have bounced off a flat wall when picked up by a detector (see the video after the break). Though it's still early days, such materials could one day protect ships from sonar or improve concert hall acoustics, for instance. It's also got the pyramid power thing going on -- so maybe it could also keep your razor sharp.
Watch an ultrasonic array move objects in 3D space (video)
Ultrasonic levitation has been possible for awhile, but it's not very practical when objects must typically hover along a single axis. University of Tokyo researchers Yoichi Ochiai, Takayuki Hoshi and Jun Rekimoto have cleared this hurdle with an ultrasonic array that can push items around in 3D space. The machine creates a focal point from a three-dimensional standing wave; users just have to alter the wave's properties to move whatever is caught inside that point. The technique can manipulate a wide range of materials, and it's safe to disrupt with your hands. While the array will need to scale up before it lifts objects much larger than matchsticks or screws, it already shows that we don't need exotic technologies like tractor beams to float things through the air.
Moog's LEV-96 sensoriactuator prototype wields touch control of 96 simultaneous harmonics, we go eyes-on (video)
Late last week, Moog outed its LEV-96 sensoriactuator prototype and offered a glimpse at its latest R&D unit. Even though it's still in the early phases of beta-testing, we were able to stop by the Moog Music factory for a closer look and a brief glimpse of the gear in action ahead of its appearance at Moogfest. While the unit is installed on acoustic guitars for the time being, the company says that similar tech can be used on other acoustic instruments and eventually to other surfaces -- this is just the current manifestation. Since the tech modifies the guitar's natural harmonics and string vibrations, the LEV-96 is getting cozy on both traditional acoustic guitars and those outfitted with pickups in its present state. As far as controls go, the entire unit is capacitive touch-enabled from the moment a finger swipe powers it on. Sliders allow for adjusting the intensity, harmonics and note duration while the other buttons enable arpeggio presets and modulation that includes tremolo and random harmonic tweaks. Those sliders remain in play when a preset is activated, serving to enable further adjustments on selected There is a lock button, too, so that you don't accidentally make a switch mid-strum. All of these finger-friendly surfaces work alongside two pairs of electromagnetic pickup channels per string to wrangle the 96 simultaneous harmonics. Magnets work to either increase of decrease the string's motion, bringing out vibrational modes that have always been in-play on acoustic instruments, but have never been offered the power needed to make 'em sing. The folks at Moog are quick to remind us that the LEV-96 is still in its infancy, but you can rest assured we'll be keeping an eye our for what develops. For a peek at the tech in action, head on past the break for a really quick demo that we kept brief due to that fact that this is an early prototype.%Gallery-169322%
Acoustic barcodes store data in sound, go on just about anything (video)
Technologies like NFC, RFID and QR codes are quickly becoming a normal part of everyday life, and now a group from Carnegie Mellon University has a fresh take on close-quarters data it calls acoustic barcodes. It involves physically etching a barcode-like pattern onto almost any surface, so it produces sound when something's dragged across it -- a fingernail, for example. A computer is then fed that sound through a microphone, recognizes the waveform and executes a command based on it. By altering the space between the grooves, it's possible to create endless unique identifiers that are associated with different actions. It's easy to see how smartphones could take advantage of this -- not that we recommend dragging your new iPhone over ridged surfaces -- but unlike the technologies mentioned earlier, not all potential applications envisage a personal reading device. Dot barcodes around an area, install the sound processing hardware on site, and you've got yourself an interactive space primed for breaking freshly manicured nails. We're pretty impressed by the simplicity of the concept, and the team does a good job of presenting scenarios for implementing it, which you can see in the video below. And, if you'd like to learn a little more about the idea or delve into the full academic paper, the source links await you. [Thanks, Julia]
'Free form' lens over mobile display could improve audio and haptics, says Motorola patent filing
It's hard to tell exactly what Motorola is thinking of here, but it probably isn't a billowing sheet of fabric stretched loosely over the face of a smartphone -- even if that's what it looks like. Instead, this appears to be a patent application for a "free floating display lens" that helps the panel of a mobile device to be used as a Beo-style acoustic speaker. The idea is that you can get louder and less resonant sound without having to dedicate more precious real estate to a larger traditional speaker unit. The application also talks about generating haptic feedback on the lens, using the same underlying piezoelectric structures that would power the audio. Creating vibrations this way could require "eight times" less voltage than current methods while also delivering a higher-amplitude sensation. Merge that with KDDI's weird vibrational speaker technology and the results could be deafening.
Yamaha gets Fuji TV into InfoSound, to bring acoustic data transmission apps to tablets and phones
Remember Yamaha's InfoSound technology? If not, well, it's a bit of black magic that shoots data wirelessly to devices using an inaudible (to humans, anyway) 18kHz signal emitted from a speaker and received via microphone. Yamaha came up with the idea back before the ubiquity of WiFi-enabled TVs, and now it's partnered up with Fuji Television Network to develop apps for phones and tablets that use the tech. Keep in mind, InfoSound has a fairly short range (33 feet) and maxes out with a data rate of only 80 bits per second, so you won't be streaming sound or video. That said, it's a fat enough pipe to send out hyperlinks, so the apps seem destined for use in retail outlets and in conjunction with digital signage to make it easy for folks to navigate to websites or receive store coupons. Further details are few and far between for now, but what info we do have can be found in the PR after the break.
No Comment: The iPhone Megaphone
We've actually seen this megaphone idea implemented before. While it's probably easiest to just go ahead and plug your iPhone in rather than trying to mechanically amplify the sound waves with a series of cones and chambers, that hasn't stopped some designers from putting together some intriguing devices for making your iPhone louder (and clearer?). All that said, we'd like to say this "acoustic horn" manufactured out of ceramic and placed on a walnut tripod was just another jokey accessory, but given how well-designed it looks? We'll just say: No comment.
Caltech researchers devise acoustic diode that sends sound one-way, could harvest energy
Sound has this habit of traveling in more than one direction -- useful in most circumstances, but not so welcome when a person in one room is looking for a little peace and quiet while someone in the next is blasting music. Sound-proofing is one solution to that problem, but some researchers at Caltech say they've now come up with a better one: an acoustic diode that can be tuned to allow sound to pass through in only one direction. As you might expect, however, that's all still very much in the early stages, but the researchers say the technology could eventually allow for "true soundproofing," or even be used for other purposes, like scavenging sound energy from structural vibrations and turning that into electricity. The official announcement with some of the finer details is after the break, and the researchers' full paper is published in the July 24th issue of Nature Materials.
Acoustic Alarm ditches the snooze button for strings
There's a long history of alarm clocks that promise a better way of waking you up in the morning, but few quite like this Acoustic Alarm built by designer Jamie McMahon. As you can see, it's not technically an alarm clock, but it does have an alarm of sorts: four tunable strings that are plucked using a spinning guitar pick. Unfortunately, this one's strictly one of a kind for the time being, but it does actually exist in prototype form -- made of birch plywood, walnut and stainless steel, no less -- and you can check it out in action in the video after the break.
US Army to deploy Individual Gunshot Detector, essentially a radar for bullets
Latest in our series of "when video games turn real," here's the US Army's newest addition to the wargadget arsenal. The Individual Gunshot Detector, produced by QinetiQ, is an acoustic monitor attuned to tracking down the source of gunshots just by their sound. It has four sensors to pick up the noise of incoming fire, and its analysis of those sound waves produces a readout on a small display that lets the soldier know where the deadly projectiles originated from. The entire system weighs just under two pounds, and while it may not be much help in an actual firefight -- there's no way to distinguish between friendly and hostile fire -- we imagine it'll be a pretty handy tool to have if assaulted by well hidden enemies. 13,000 IGD units are being shipped out to Afghanistan later this month, with a view to deploying 1,500 each month going forward and an ultimate ambition of networking their data so that when one soldier's detector picks up a gunfire source, his nearby colleagues can be informed as well.
Ancient acoustic engineers used stucco, drugs, and architecture to rock and confuse audiences
It's always fun when scientists discover new stuff about really old cultures, especially when it has to do with getting weird and rocking out. Recent research suggests temples built around 600 A.D. in Palenque, Mexico were designed with projection rooms that shot the sound of voices and instruments 300 feet away with the help of stucco-coated surfaces. 1600 years before that, in the Peruvian Andes, a pre-Incan society in Chavín was constructing a nightmarish Gallery of Labyrinths to play "strange acoustic tricks" during cult initiations: animal-like roars from horns, disorienting echoes, and maybe even choirs designed to produce otherworldly effects. And all of this while the poor inductees were being fed psychedelic San Pedro cacti. Yikes! To a certain extent this is all speculation, but we can tell you that if we were ancient priests with this kind of gear at our disposal we'd be using it for mind-controlling purposes too. Just because! [Photo adapted from Jenny Pansing's flickr]
InputDynamics makes dumbphones smarter with tap-to-touch tech
You can't afford a proper QWERTY keyboard on your phone, much less a expansive multitouch slate. What to do? Well, if a UK startup named InputDynamics has its way, you'll just tap on any surface of your handset. The company's developed a piece of software called TouchDevice that uses a phone's embedded microphone to analyze the acoustics inside, reacting to your finger's impact on the surface with a touchscreen-like input on the device. New Scientist reports that's not all, as the algorithms can also be fine tuned for detect scratches and swipes for scrolling and zoom, and the company's in talks with "tier-one handset manufacturers" to license the program even as we speak. You'll forgive us if we're a bit skeptical, though -- if this truly requires only software and works on any surface, why not release an app to tap the backs of our Droids, BlackBerrys and iPhones?
UK defense firm pumps data through solid submarine walls
Wireless power may still be on the drawing board, but wireless data is here today, and a UK defense contractor has figured out a way to pipe the latter through several inches of steel. Using a pair of piezoelectric transducers on either side of a watertight submarine compartment, BAE's "Through Hull Data Link" sends and receives an acoustic wave capable of 15MHz data rates, enough to transmit video by essentially hammering ever-so-slightly on the walls. BAE impressed submarine commanders by streaming Das Boot right through their three-inch hulls, and while metadrama is obviously the killer app here, the company claims it will also save millions by replacing the worrisome wiring that's physically routed via holes in a submarine's frame. See the company's full US patent application at our more coverage link.
