Articles tagged with Acoustics
Researchers at the University of Technology Sydney have extended the theory of acoustic levitation to account for asymmetrical particles, which is more applicable to real-world experience. This new understanding enables precise control and sorting of tiny objects using ultrasonic waves.
Researchers used AI to analyze seismic signals and predict future fault friction and next failure time with high resolution in laboratory earthquakes. The technique goes beyond previous work by predicting the future state of the fault's physical system.
Researchers used physics-based models and historical data to debunk internet claims about the Saturn V's acoustic power, finding levels of 203 decibels, comparable to commercial jet engines. The study also predicts sound levels for NASA's SLS Artemis 1 launch and provides educational tools for college-level physics classrooms.
Scientists at the University of Tsukuba have developed a theoretical model to describe the motion of ultrasound waves in liquids containing multiple bubbles, which may enable advances in diagnostic and therapeutic applications of ultrasound technology. The new equations can also be used to enhance microbubble-enhanced medical applicati...
Scientists review recent experiments and find noise regulations may need to be changed to protect marine mammals from pile driving noise. The current guidance is 7 years old and may not provide sufficient protection for species like harbor porpoises and seals.
John Kershner, a Lehigh University PhD candidate, has been awarded a Fulbright research grant to continue his work on owl-inspired aero-acoustics in Germany. He will collaborate with researchers at Brandenburg Technical University and the DLR to experimentally test these designs.
Numerical simulations show that sonic booms can be prolonged by the shape of cities, with narrower streets introducing more complex boom propagation. The researchers aim to investigate this phenomenon further to better understand its impact on noise levels in urban areas.
A research team from USTC designed a microelectromechanical system (MEMS) resonator with ultra-high Q based on lithium niobate thin film. The quality factor at parallel resonance increased by two orders of magnitude compared to previously reported acoustic resonators.
A research team from the University of Science and Technology of China designed a microelectromechanical system (MEMS) resonator with ultra-high Q based on lithium niobate (LiNbO3) thin film. The quality factor at parallel resonance was increased by two orders of magnitude, paving the way for designing 6G communication devices.
The Collaborative Research Centre Hearing Acoustics is developing smart hearing aids that use artificial intelligence to adjust to different environments. The project, which aims to create more adaptable hearing devices, has received $8.1 million in funding for another four years.
A new AI method can distinguish between the overall sounds of healthy and unhealthy coral reefs, making it a valuable tool for monitoring reef health. The technique uses machine learning to analyze sound recordings and track the progress of reef restoration projects.
A team of researchers from the University of Tsukuba has developed a new approach for accurate underwater acoustic positioning in multipath environments. By using a database of signals and selectively removing reflected waves, they achieve centimeter-scale accuracy in object location, even in shallow waters.
Researchers developed an approach to predict shooter localization accuracy using geometric considerations, sensor characteristics, and urban environment. The prediction is represented as an ellipse-shaped area around the true shooter location, with smaller areas indicating higher accuracy.
A new tool called DeepSqueak uses deep learning to identify marine mammal calls with high accuracy, even in noisy environments. The tool was originally developed for rodent ultrasound signals but has been adapted to detect sounds at other frequencies, including humpback whales and delphinids.
Researchers used mathematical modeling to identify effective solutions, including strategically placed berms. A civil conversation between the source of the noise and the receiver is also crucial in finding an agreeable outcome.
Researchers at ETH Zurich successfully demonstrated a protocol for gentle, controlled measurement of mechanical quantum states in hybrid qubit-resonator devices. This breakthrough enables applications such as quantum error correction and more, paving the way for advanced technological innovations.
The Rule of Two method uses multiple measurements to collect reliable data, overcoming the limitations of single sine sweep techniques. This new approach will make it easier and faster to design rooms with optimal acoustic combinations, leading to better sound quality in various spaces.
Researchers developed a highly efficient wave-based acoustics simulation that can accurately estimate the acoustics of large-scale interior spaces. The method uses a time-domain Finite Element Method to consider frequency-dependent characteristics of sound absorption materials, enabling precise modeling and high-speed estimations.
Harvard researchers create first topological acoustic transistor, utilizing sound waves to control flow on and off. The device demonstrates scalable and controllable 'acoustic switches' with potential applications in efficient noise reduction, ultrasound imaging, and more.
Researchers at City University of Hong Kong have discovered a new type of sound wave that vibrates transversely and carries both spin and orbital angular momentum like light. This finding provides new degrees of freedom for sound manipulations, enabling unprecedented acoustic communications and sensing capabilities.
Researchers investigate glacial ice melting that releases acoustically distinct pressurized underwater bubbles, providing a potential tool for monitoring climate change's impact on glaciers. The team's experiments will permit the long-term monitoring of ice loss and its link to water temperature.
Researchers at Johns Hopkins APL aim to create an ideal baby monitor that filters out unwanted noises, ensuring parents don't miss infant cries. The team's open-source device uses audio processing hardware to filter out background sounds, improving the overall baby monitoring experience.
The Seattle Space Needle renovation incorporated acoustic designs to limit sound transmission, enhancing visitor experience. Acoustic materials and effective reverberant sound control were selected for the observation levels and restaurant.
Researchers use speaker shakers to generate vibrations in a plate, creating sound waves that constructively interfere at the target minifigure. The focused energy knocks over the single Lego minifig without disrupting the surrounding minifigs.
A study by Brynn Kimber and team reveals killer whales spending more time in the Arctic due to reduced sea ice, posing new threats to prey species. The warmer climate is altering the predators' hunting patterns, leading to increased risks for endangered bowhead whales.
Masks designed for singers block aerosols, diluting virus-causing particles, while affecting high frequencies. Singer's masks reduced high-frequency power by less than two times, improving enunciation.
Ocean predators survive on small, scattered areas of food rather than average concentrations found in the water. Acoustic tools reveal dynamic layered maps of ocean life by interpreting echoes from sound pulses, providing insights into how animals adapt to find and exploit resources.
A study found that adults with sensory impairment experienced a decline in emotional well-being during the pandemic due to lack of social interactions. Researchers hope to develop hybrid solutions for remote access and clear communication.
People with mild dementia struggle to understand speech in both quiet and acoustically challenging situations. Effective communication strategies include speaking clearly and slowly, reducing background noise, and providing contextual information.
A new theory suggests that stuttering is caused by anomalies in the brain's initiation circuit, which chooses a word to speak. This circuit is separate from the muscle-coordinating circuit, and its impairment leads to stuttering. Researchers believe this could lead to targeted treatments for stuttering with fewer side effects.
Converting empty offices into podcast studios poses unique acoustic challenges. Experts recommend optimizing space for better sound quality, using minimal absorptive treatments and selecting suitable microphones. Aesthetically pleasing room finishes are also crucial for visually appealing recording spaces.
Bats build prediction models of prey movement by analyzing echoes of their own vocalizations. This acoustic information facilitates navigation and foraging in total darkness. By integrating representations of prey echoes, bats can determine distance, size, shape, and density, as well as identify what they are tracking.
A study by Penn State University and Virginia Tech Transportation Institute found that electric vehicle sounds can improve pedestrian safety, but with some cases of false negatives at close ranges. Adding sound to electric vehicles increases detection distances beyond minimum safe detection ranges.
Researchers at the University of California, Davis and the University of Texas at Dallas found that listeners can reliably identify the gender of individual children as young as 5. They also discovered that identification of gender must take place jointly with the identification of age and likely physical size.
Researchers from Utah State University and KAUST found clear acoustic signatures of oil temperature in deep-frying sounds. The unique bubble patterns near the oil surface create distinct noises that vary with heat levels.
Researchers at Pohang University of Science & Technology have demonstrated optical-wave signal amplification and cancellation using optically driven acoustic waves on a silicon chip. This achievement paves the way for new applications in signal processing, sensing, and nanostructures.
Researchers from Harvard University and Carnegie Mellon University found that matching the locations of faces with speech sounds significantly improves understanding of speech, especially in noisy areas. Spatial alignment is more important when background noise is louder.
A study by University of British Columbia researchers reveals that southern resident killer whales have access to four to six times more Chinook salmon in the Salish Sea than northern residents. This challenges the common notion of a prey shortage for southern residents during summer feeding grounds.
Researchers used MEG to measure brain activity while participants listened to simultaneous math equations and sentences, finding separate networks for each. The parietal lobe processed math and the temporal lobe processed language, with activity tracking every word and symbol.
Researchers used EEG to measure brain activity while musicians listened to or imagined Bach piano melodies. Brain activity during imagined music had the opposite polarity of actual listening, indicating prediction-driven responses. The study found that the brain continues to respond to music even when none is playing.
Research reveals that even professional female sopranos tend to be inaccurate in self-assessing their own singing abilities. However, those with higher singing competence are better at evaluating themselves. The study's findings suggest that self-evaluation plays a crucial role in developing exceptional musical skills.
Research published in Ibis found that call rates of migratory birds were significantly higher in urban areas compared to villages, indicating a impact of artificial light on bird migration. The study suggests that improved management of urban lighting is necessary to mitigate this effect.
Researchers developed an innovative method using acoustic lighthouses to reduce bird strikes with tall human-made structures. By broadcasting specific sounds, these 'acoustic lighthouses' minimize the risk of collisions without visually disturbing birds.
A study found that algorithm-generated music recommendations are less accurate for listeners of non-mainstream music compared to those who listen to mainstream music. The researchers identified four groups of non-mainstream music listeners based on their listening habits and found that users who listened to high-energy music received t...
Researchers found that algorithm-generated music recommendations were less accurate for listeners of high-energy music such as hard rock and hip-hop. Those who mostly listened to ambient music received the most accurate recommendations, while those who mostly listened to hard rock received the least accurate ones.
Haiyan Wang developed a new approach to creating high-quality thin films used in devices for optics, acoustics, and electronics. The innovation uses a versatile nanocomposite-seeded method to create single-layer films, improving production efficiency.
A team of researchers at the University of Illinois replicated hypersonic flow conditions in a NASA Langley Mach 6 wind tunnel using a numerical simulation. The study aimed to better understand the complexities of hypersonic flows, including pressure, temperature, and fluid velocity.
A study published in IEEE Transactions on Power Electronics detects the earliest stages of failure in silicon carbide power electronics through real-time acoustic monitoring. The researchers found that increasing acoustic emission signals correspond to progressive damage to aluminum ribbons, allowing for early warning of device failure.
Researchers have created an optical switch that can direct high-frequency gamma radiation by switching the acoustic field. This effect demonstrates controlled transparency of a resonant medium for gamma radiation, which may be useful for controlling generated radiation in modern synchrotron sources and X-ray lasers.
Researchers from Swiss Federal Laboratories for Materials Science and Technology (EMPA) have developed a method to detect keyhole instability in laser deep penetration welding. The technique uses an acoustic sensor and optical measurements analyzed with artificial intelligence, allowing for real-time monitoring of weld quality.
Researchers found that gesturing while speaking affects the sound of a person's voice, adding acoustic emphasis. The study suggests that gestures carry additional information about bodily tension and motion, contradicting traditional views on language.
Researchers are developing a smartphone app to diagnose COVID-19 at home using acoustic sensing and AI techniques. The system measures changes in human airway mechanics, which are uniquely correlated to COVID-19 infection.
Researchers found that state-of-the-art ASR systems performed worse on black speakers than white speakers, with error rates of 0.35 and 0.19 words per hour respectively. The study attributes these disparities to limitations in the acoustic models' ability to capture African American Vernacular English pronunciation and prosody.
A Curtin University-led study found that Ross Sea killer whales, also known as Type C, have a unique call repertoire comprising burst-pulse sounds and whistles to convey information about their environment. The research analyzed data from over 392 encounters with the species.
Researchers used soundscape analysis to evaluate restoration efforts on Western Aleutian Islands, finding that acoustic diversity and complexity indicate ecosystem health. The approach could assess restoration outcomes at a fraction of the effort required for traditional methods.
Humpback whales tend to socialize less in the presence of small fishing boats compared to when there are no vessels present. The noise from boats may be masking their signals, making it difficult for them to communicate and join together.
A cache of 12 previously unreleased songs by Hall of Fame artist Lou Reed has been unearthed on a cassette tape from 1975, according to a study published in the Journal of Musicology. Cornell musicologist Judith Peraino discovered the rare recordings while conducting archival research at the Andy Warhol Museum.
Researchers have pinpointed the source of acoustic signals emitted by stressed faults in a numerical model, which could lead to more accurate earthquake predictions. The study reveals that the collapse of stress chains inside an earthquake gouge emits these signals.
Researchers found that participants overestimated their effort when the feedback indicated faster heartbeat and did not underestimate it when the feedback indicated slower heartbeat. The study suggests that false cardiac feedback can produce an interoceptive illusion of effort.
Researchers have introduced a new wearable audio dataset with up to 80 microphones, which can simulate different hearing scenarios and improve the performance of devices like smart headphones. The data set is now available for free under an open-access license, making it easier for future researchers to access and build upon.