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A "Sound Camera" Zeroes In on Buzz, Squeak, and Rattle

Annoying noise—what the automotive industry calls “buzz, squeak, and rattle” (BSR)—is the leading cause of customer complaints about new cars. Eliminating noise during the design and prototyping phase can pay big dividends…but locating transient, intermittent, ill-defined sounds like BSR or cricket chirps can be exasperatingly difficult.

[Localizing dashboard rattle in real time. Video courtesy Hyundai and SM Instruments]

Designers at Hyundai Motor Group enlisted SM Instruments, a Korean acoustic-engineering firm, to help them quickly locate irritating 200 Hz-to-20 kHz noises in car engines, bodies, instrument panels, seats, doors…any place components can vibrate or rub. The result was the SeeSV-S205, a compact, hand-held “sound camera”—an array comprising dozens of inexpensive-but-sensitive MEMS microphones (similar to those found in cell phones) in a five-armed spiral around a video camera. The device (like other acoustic cameras that have preceded it) compares the signals from all of the microphones—the process is called beamforming—to trace the incoming sound back to its source.

The SeeSV, however, compresses the microphone phased array into a compact housing with a single-board, reconfigurable input-output controller. The result is a handheld test instrument that, in real time (25 frames per second), superimposes a sound heat-map over the video image to quickly localize the sound. Field programmable gate arrays in the controller and a graphical user interface let the user narrow down the frequencies analyzed, to further increase accuracy.

Though developed for the automotive industry, the compact acoustic camera can be applied to locating and eliminating unwanted noise in any engineering project. The sleek SeeSV won finalist recognition for Hundai’s Kang-Duck Ih and SM Instruments’ Youngkey K. Kim at the 2014 NI Engineering Impact Awards (formerly the Graphical System Design Achievement Awards), presented 5 August in Austin, Tex.

Images: Hyundai Motor Group and SM Instruments

Robotic Telescope Captures Clear Images of Exoplanet Stars

This story was corrected on 12 August 2014.

From earth, a robotic telescope, called Robo-AO, can now snap high resolution images of stars near exoplanets and automatically set itself up to research hundreds of new targets each night. Although adaptive optics is an established technique, an international team of researchers says that Robo-OA is the world’s first fully autonomous laser adaptive optics and imaging system. The benefit: Robo-AO, which is attached to a 1.5-meter telescope, can study thousands of exoplanet systems in record setting time.

The utility of most ground-based telescopes is limited because of the blurring effects caused by turbulence in the earth’s atmosphere. But, Robo-AO accounts for this turbulence, allowing it to capture images rivaling the resolution of those captured by the Hubble Space Telescope.  

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What Do Women in Engineering Want?

For years, psychologist Nadya A. Fouad of the University of Wisconsin in Milwaukee has been asking women in engineering what they want. She and organizational psychologist Romila Singh, also at U-W Milwaukee, conducted a National Science Foundation-supported survey asking over 5,000 female engineers their reasons for leaving—or staying—in the field. On Saturday, 9 August, at the American Psychological Association annual meeting in Washington, D.C., Fouad presented their latest analysis of that data. Those who leave, she reports, turn out to be just as confident and successful as those who stay. They may, however, be more likely to have encountered belittling or undermining from colleagues and a lack of support from their supervisors.

"I really want the narrative to not just be: 'Women don't have confidence, women need to lean in,'" Fouad says. "With all the will in the world, if the climate doesn't change, women can lean in, but they will still get pushed back."

Eleven percent of Fouad and Singh's survey respondents had earned engineering degrees but never worked as engineers; another 27 percent had practiced engineering but left the field, and 62 percent were still working as engineers. Fouad and Singh attempted to detect patterns that might distinguish those who left from those who stayed. Average income, racial distribution, and marital status did not differ between the two groups. Yet some 17 percent of those who never entered engineering blamed engineering culture.

Sometimes that may take the form of belittling behavior. Aerospace engineer Huan Xu of the University of Maryland in College Park recalls a graduate school prank her male classmates bragged about. They'd rearranged everything on the desk of a female student and put a nameplate on it to make it look like a receptionist. "They didn't really have a malicious reason for it," Xu says; the men claimed it was because the classmate was talkative, but they failed to think about the social context.

Xu and other female engineers can brush off that sort of behavior, or confront it. But Fouad and others worry that this kind of culture repels female talent, costing society valuable ideas and labor. Jennifer Hunt, Chief Economist at the U.S. Department of Labor and an MIT electrical engineering graduate, published a working paper in 2012 that tried to put a cost on one aspect of female underrepresentation: patents. She and her colleagues estimated that if females held as many commercial patents as men, the U.S. gross domestic product would be 2.7 percent higher.

Fouad and Singh are now sending their survey to male engineering graduates. The percentage of men in engineering is higher than that of female engineering majors, so something is keeping them there. In a third survey, says Fouad, "We're going to working engineers [of both genders] and saying, 'What keeps you there?'" The researchers say they hope to learn from companies that are good at retaining employees. "It's not just about fixing women, we need to fix the work environment, as well," says Fouad.

 

 

 

Bendable Sound Waves Can Skirt Objects, Trap Particles

Scientists have developed a method to bend sound waves as they travel through open air, and can even create an acoustic “bottle” that can trap and hold tiny particles. The method could improve cell sorting, sharpen ultrasound images, even lead to a sonic cloaking device.

The method, developed in the laboratory of Xiang Zhang, professor of mechanical engineering at the University of California in Berkeley, requires adjusting the phase and amplitude of the sound coming from each of dozens of closely spaced speakers. With precise calculations, the differences among the speakers produce an interference pattern that causes a beam of sound to bend in a desired way. That includes bending the waves so the sound travels around an object and then continues on its original path. The waves can be manipulated to whatever extent is required, says Jie Zhu, who coauthored the Nature Communications paper describing the work when he was a postdoc in Zhang’s lab.

“First you have to know what you want to achieve, then, using our method, you can construct the shape at the source,” says Zhu, now assistant professor of mechanical engineering at the Hong Kong Polytechnic University.

With a linear array of 40 speakers, each 1.5 centimeters in diameter, spaced 2.5 cm apart, and operating at a frequency of 10 kilohertz, the researchers shaped the sound waves in two dimensions. When they set up a two-dimensional array of over 100 such speakers, they were able to curve the waves in three dimensions, creating an acoustic bottle, with high acoustic pressure forming the walls. They placed a hard plastic ball in the center of the bottle, and found that the pressure of the sound waves pushed at it to hold it in place. Zhu says the bottle was fairly weak, but using more powerful speakers would strengthen it. Such a bottle could be used to carry a small particle, creating acoustic tweezers that could be used, for example, to sort cells or molecules in a solution.

The ability to direct sound around objects in its path could improve ultrasound imaging by allowing sound waves to skirt bones that would otherwise be in the way of what they were trying to see.

The technique grew out of work Zhang’s lab has done on metamaterials, which contain periodic structures that cause light or sound waves to move in unusual ways. Zhang and others have used metamaterials to create cloaking devices to hide objects from specific frequencies of light or sound. Zhu says that using the same principles, but without the metamaterial, allows them to achieve similar feats in free space, making it much more attractive for practical use. “Most applications happen in the air or in liquid,” he says. “Most applications don’t allow us to change the medium.”

IBM's Brain-Inspired Computer Chip Comes from the Future

Brain-inspired computers have tickled the public imagination ever since Arnold Schwarzenegger's character in “Terminator 2: Judgment Day” uttered: “My CPU is a neural net processor; a learning computer.” Today, IBM researchers backed by U.S. military funding unveiled a new computer chip that they say could revolutionize everything from smartphones to smart cars—and perhaps pave the way for neural networks to someday approach the computing capabilities of the human brain.

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NASA's Abandoned ISEE-3 Spacecraft To Fly Past Moon

In a few days time, ISEE-3 will begin its long goodbye, as it zips some 12,000 kilometers above the surface of the moon on Sunday before continuing on back into deep space.

For the volunteers who have tried to bring the 35-year-old NASA spacecraft back home, it's likely to be a bittersweet moment. A "reboot" team led by Dennis Wingo, CEO of California-based Skycorp Incorporated, and Keith Cowing, editor of the websites NASAWatch and SpaceRef, worked for months to return the spacecraft to an orbit close to the Earth's, where it could resume its original mission observing the solar environment.

The team raised nearly $160,000 in a crowd-funding campaign, redeveloped the capability to communicate with the spacecraft, obtained permission from NASA to command the spacecraft, and successfully took control.

But attempts to fire the thrusters fizzled. Although there was some early hope that creative plumbing might fix the problem, in the end, the team determined that there wasn't enough nitrogen pressurant left to force hydrazine fuel through the spacecraft's thrusters. "It obviously leaked away, but the mechanism for how that happened is undetermined at this time," Wingo says.

The team is not yet done with ISEE-3, however. At least four of the spacecraft's instruments are returning good data, Wingo says. That includes a magnetometer that can explore the front where the Earth's magnetosphere meets the solar wind, and an experiment that can be used to measure the flux of protons coming from the sun. 

Radio dishes on the ground will be able to pick up ISEE-3's science signals for months to come. The last to be able to do so—the Arecibo telescope in Puerto Rico—will likely lose contact with the spacecraft in about a year, Wingo says.

Although ISEE-3's nitrogen leaked away, the spacecraft has shown incredible longevity otherwise. Its solar arrays draw more than 90 percent of the power they did in 1980—about 150 W—and the spacecraft's 1970's CMOS circuitry—which consists of 4000-series RCA state logic—is still largely functional. When it comes to the solar arrays, Wingo says, it's possible that some low-temperature self-annealing process might have helped repair radiation damage. 

The spacecraft will have to hold up even longer if we're to make contact once more. It will be another 15 years before ISEE-3 gets this close to Earth again.

Rachel Courtland can be found on Twitter at @rcourt.

Your Candy Wrappers are Listening

“I had to double check I wasn’t playing the wrong audio file.”

The first time Abe Davis coaxed intelligible speech from a silent video of a bag of crab chips (an impassioned recitation of “Mary Had a Little Lamb”) he could hardly believe it was possible. Davis is a Ph.D. candidate at MIT, and his group’s image processing algorithm can turn everyday objects into visual microphones—deciphering the tiny vibrations they undergo as captured on video. 

The research, which will be presented at the computer graphics conference SIGGRAPH 2014 next week, builds on work from MIT’s Computer Science and Artificial Intelligence Laboratory to capture movement on video much smaller than a single pixel. By seeing how border pixels on an object fluctuated in color, the group’s algorithm can measure and calculate the object's minuscule movements (and even magnify a wine glass’s oscillations when a tone is played or visually reveal a heartbeat under the skin).

“It was clear for us quickly that there’s a strong relation between sound and visual motion,” says Michael Rubinstein, a postdoc at Microsoft Research who worked on this and the earlier CSAIL research. “We had this crazy idea: can we actually use videos to recover sound?”

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An NMR Chip The Size of a Seed

Engineers at Harvard University have made a nuclear magnetic resonance (NMR) spectroscopy chip so small you can hardly see it. It fits on a 2mm-by-2mm silicon chip and is the smallest NMR system built yet. The chip could lead to an ultra-compact, affordable NMR machine for spotting bacteria or cancer proteins in a doctors office or for quality control in drug and chemical production lines.

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Is There Any Way to Avoid Standards Wars in the Emerging Internet of Things?

Smart cars, smart gear, smart homes, smart offices and smart cities are all being developed and prototyped today, in hopes they’ll benefit from the so-called “Internet of Things” (IoT). Equipping just about every object so that it can connect to the Internet is no different than bringing out single new technologies. Well, at least in one respect: Wherever there are rival standards—as purchasers of junked consumer electronics standards like Betamax and HD-DVD know—there are winners, and there are losers.

Jeffrey Kaplan, managing director of Think Strategies, Inc. in Wellesley, Mass., says he suspects IoT standards will have broad impacts for consumers, especially if differences in competing standards can’t be negotiated and settled behind the scenes.

“It requires a tremendous amount of standards debate, deliberation and decision-making to ensure that the various parties play nice together,” he says.

He points to three industry-wide groups that are each attempting to establish their own IoT standards—one of which is the IEEE, publisher of IEEE Spectrum. The other groups, small consortia of companies with IoT interests are: the Open Interconnect Consortium, which includes Intel, Atmel, Broadcom, Dell, Samsung, and Wind River; and the Thread Group, comprising Nest Labs, Samsung, Yale Security, Silicon Labs, Freescale Semiconductor, ARM, and Big Ass Fans. (No, that was not a typo. Samsung has decided to hedge its bets by joining both of the corporate groups.)

“If you want to know where the pot of gold is around all this, it has to do with the fact that the Internet of Things is fundamentally about capturing data from all these things and tracking the behavior of these things—and, of course, whoever is using those things,” says Think Strategies' Kaplan. The data from, say, a network-connected thermostat or network-connected car then streams back to third parties (the original manufacturer or a partner company) so the firm can “try to gain a competitive advantage in winning more business from the user of those things.”

Of course, today, nearly everyone carries one Internet-connected “thing” around in their pockets or purses. They often use it to make calls or send text messages, while another connected “thing” sits on their desk, often attached to a keyboard and mouse. Standards for how these devices talk to each other (Wi-fi and Bluetooth, to give two examples) already exist. (And, in the interest of full disclosure, IEEE is also a stakeholder in some of those standards as well.)

So, why can’t we use the standards that are already in place?

IoT companies already do, Kaplan says. Wi-Fi is the presumed default communication standard for devices with their larger networks. But he says security, privacy, efficiency and other concerns also make additional standards necessary.

Consider the Internet-connected car. “Anything that’s software enabled will, by definition, have to be updated on a regular basis,” says Kaplan. “The standards that will govern how that update process works [are now being debated]…The automobile industry is trying to figure this out as well as the software industry.”

Kaplan says he expects to see standards-making activity in commercial IoT applications outpace consumer-dominated spaces like smart homes and smart cars in the early going. (He suspects that workplace applications were a key consideration in Google’s recent purchase of smart thermostat maker Nest Labs. Like the high-priced business software that is keeping Microsoft afloat, the cost-per-unit Nest can charge for its devices will be higher in work spaces than in homes, he says.)

This year, for instance, AT&T, Cisco, GE, Intel, and IBM have partnered to develop what they’re calling the “Industrial Internet.” And the Industrial Internet Consortium, Kaplan says, should really be mentioned alongside the aforementioned usual suspects of IoT standards bodies.

“The Industrial Internet is an underpinning for the Internet of Things,” he says. “Like a lot of the technology world, the Internet of Things has two sides to the coin. One is the consumer Internet of Things. The other is the industrial.”

So the standards governing heightened security, reliability, performance, and throughput that the Industrial Internet partners hope to promote might more closely resemble the standards that we’ll actually see for IoT devices in the coming years than will the ones being pitched for consumer Internet standards, he says.

"It's a Pandora's Box that's been created here," he says. "The promise of the Internet of Things has brought with it a whole lot of challenges. And for good reasons, a lot of folks are coming together to say, If we don't figure out how to address these problems, people aren't going to buy into the promise."

 

 

USB Flash Drives Are More Dangerous Than You Think

You would have had to be living on the moon not to know by now that USB flash drives are a serious security risk: They spread computer viruses the way reused needles spread real ones. If you didn’t realize that before, news that the Stuxnet computer worm (which hobbled Iran’s uranium-enrichment program) was distributed through infected flash drives should have clued you in. Now specialists at Security Research Labs in Berlin say that many other types of USB peripherals can also spread malware. They are presenting their ideas next week in Las Vegas at the Black Hat security conference in a talk entitled, “BadUSB—On accessories that turn evil.

The researcher’s basic thesis is this:

1. Many peripheral devices incorporate special USB-controller chips that themselves can be reprogrammed.

2. There are no protections in place to prevent a malicious party from manipulating one of these USB-controller chips in this way.

3. Such a hack could enable the peripheral to inject malware into your computer, which could do nasty things, including manipulating the firmware in other peripheral devices that you later plug in.

4. Rinse and repeat.

The researchers claim that a USB peripheral could, for example, pretend to be a network card and surreptitiously redirect your Internet communications by changing your DNS settings. Or it could impersonate a keyboard and issue command-line instructions to do almost anything.

What’s not clear, though, is whether these are examples of things that could be done using just the memory available to a typical USB-controller chip. My guess is that these tasks would take more space than what's found in the EEPROMs normally attached to these chips. A keyboard, for instance, might have only an 8 kilobyte EEPROM connected to store such variables as the USB-device description and special key mappings. Malware is typically much bigger. The experimental hacks these researchers have carried out probably run a large chunk of code stored invisibly in the flash memory of a USB thumb drive. If that surmise is correct, it would suggest that USB peripherals with minimal data storage are perhaps not so threatening.

The researchers haven't uncovered an actual instance of this kind of infection in the wild, but they emphasize that there is really no way to protect against such attacks should they come to pass. Malware scanners won’t check the firmware on USB peripherals, so these programs wouldn’t be able to detect an infection, much less remove it. Even a fresh install of your computer’s operating system would be of little use, because it wouldn’t affect what's on peripheral devices. Indeed, it would seem to me that the USB-controller firmware on computers (the “host” side of the USB communications) might also be vulnerable to hacking and would be very difficult to scan or clean.

So what’s to be done? In the short term, avoiding USB promiscuity might be a good idea. That’s already de rigueur for thumb drives, which, I'm supposing at the moment, are where the real threat lies here. Over the longer term, though, the manufacturers of USB devices will have to engineer their products so the USB-device firmware simply cannot be modified or so that modification requires some concrete action from the user—a button push or temporary jumper placement. Such a strategy could indeed help prevent malware from spreading to embedded devices of all sorts, including routers and printers, which have also been of concern of late. I for one would welcome the nuisance of a small button push now and again in return for greater piece of mind.

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