A team of scientists has reported the experimental observation of a nonlinear fractal higher-order topological insulator, which supports a rich variety of topological corner states. The fractal structure can exhibit hybrid corner states and co-existing outer corner states with different internal structures.
The Acoustical Society of America is hosting a virtual meeting from November 18-22, showcasing recent work on various topics including Alzheimer's disease detection and windfarms' impact on wildlife. Journalists can pre-register for press conferences and technical sessions.
Researchers implement defect-robust multi-channel signal processor by tailoring long-range interactions in topological photonic lattices. This approach enables multichannel topologically-protected edge modes and breaks the trade-off relation between channels and bandwidth, leading to enhanced information capacity.
A team of scientists tracked a mysterious orca group in the Humboldt Current system off the coast of Chile, revealing new hunting skills and shedding light on southern hemisphere orca conservation. The research found that these orcas hunt dusky dolphins, a species they have never been recorded hunting before, and share food among the pod.
A team of researchers at ETH Zurich created a method to suppress sound wave propagation in the backward direction without deteriorating forward propagation. They achieved this using self-oscillations and a circulator, which allows sound waves to travel only one way.
Researchers have discovered that healthy soils produce unique sound profiles reflecting the diversity of tiny living organisms. This technology holds promise in addressing global needs for effective soil biodiversity monitoring methods to protect ecosystems.
The study demonstrates a universal theory of angular Brewster effect, allowing control over both momentum and orbit. This enables asymmetric vortex transmission for electromagnetic and acoustic waves, increasing data transmission speed and quality.
A Virginia Tech researcher has developed a new tool that uses robotics and acoustic energy to move small targets, such as cells and medicine, within the body without cutting or invasive procedures. The 'invisible tweezers' have potential applications in various fields, including engineering, biology, and chemistry research.
Researchers from the Polish Academy of Sciences find that wave phenomena, like sound waves, may be responsible for heat transport in complex systems. The study uses the telegraph equation to describe how electric current propagates with attenuation along one spatial dimension.
Acoustic experts reduce noise levels in a high-end salon, improving conversation ease and protecting employees' hearing. The successful solution can be applied to other salons, restaurants, stores, and conference centers to enhance clear communication and occupational safety.
Researchers at Pohang University of Science & Technology have developed the first wide field-of-hearing metalens, overcoming traditional acoustic lens limitations. The device achieves up to 140 degrees of field-of-hearing without sound distortion, enabling new applications in acoustic imaging and high-sensitivity sensing.
A study by Edith Cowan University and Fiona Stanley Hospital found that up to 50% of ICU patients experience sleep disturbance due to noise, which can hinder recovery. The researchers identified potential for medical equipment designers to consider alarm speakers' directivity and reducing volume levels to minimize noise exposure.
The Penn State Listening Lab is analyzing national park sounds to understand human impact on wildlife, ecosystems, and visitor experiences. This research aims to inform conservation policies and protect natural quiet.
Researchers discover finite barrier bound states (FBICs) in photonic crystals, exhibiting non-radiating properties and complete localization of boundary modes within few lattice sites. This breakthrough offers a novel approach to achieving BICs and fine control of boundary modes.
Researchers used psycho-acoustic simulations and auralization to assess the noise emissions of new aircraft designs, including a blended wing body. The results show that the new design is rated significantly less noisy than conventional passenger jets, with take-offs leaving a more unfamiliar sound impression.
Researchers at TU Wien have developed a 'quantum ping-pong' where two atoms bounce a single photon back and forth. The team used a Maxwell fish-eye lens to achieve pinpoint accuracy, allowing the photons to be transferred from one atom to another with high efficiency.
Researchers found that commercial ship noise completely masks Cook Inlet beluga whales' most commonly used calls, compromising their critical communication. The study documents the complex vocal repertoire of the population and provides a quantified measure of masking by ship noise on their communication.
Researchers investigate how creaky voice use varies across different areas of Sydney, finding that the area's diversity plays a significant role. The study reveals mixed results regarding the influence of gender on creaky voice use, with no statistically significant difference found between men and women.
A new software algorithm intelligently combines vocals and instrumentals from different songs, mimicking professional music composition techniques. The result is a unique blend of pleasing lyrics and exciting instrumentals that appeal to listeners, particularly hip-hop fans.
The article discusses the importance of acoustic design in prison environments, where constant noise is harmful to both prisoners and staff. By incorporating speech intelligibility, strategic noise reduction, and privacy considerations, acoustic design can improve communication dynamics and alleviate negative social interactions.
Researchers have developed a wearable ultrasound system that can provide clinically relevant information about muscle function during dynamic physical activity. The device uses a patented approach to transmit long-duration chirps, allowing for real-time analysis of muscle dynamics and aiding in the rehabilitation process.
A team of researchers has created an audio feedback system that uses neuromorphic cameras and speaker arrays to provide real-time audio cues in three dimensions. The system enables blind players to track the ball and movements, allowing them to play table tennis with greater accuracy.
Researchers Joe Wolfe and John Smith studied the didjeridu's performance techniques, finding that a player's vocal tract plays a significant role in producing unique sounds. By analyzing acoustic impedance spectra, they identified traits of expertly played didjeridus and explored advanced techniques used by musicians.
Researchers found that the key to bundengan sound quality is in its bamboo culm sheaths, which change shape when wet and vibrate together. The instrument's performance is improved when played in the rain, providing a unique acoustic experience.
Researchers using acoustic imaging measure eye size and growth to better understand myopia's contributing factors. Education level, light stimulation, and outdoor time are found to correlate with the development of myopia. Current solutions like glasses and contacts are being replaced by eyedrops for children and collaborative efforts ...
Researchers created a unique dataset from flying discs, enabling students to learn basic signal processing tools and data visualization techniques. The experiment uses Doppler shift to determine velocity, providing valuable insights into acoustics.
Researchers have developed a needle-free ultrasound vaccine delivery technique that produces a higher immune response than traditional methods. By harnessing acoustic energy to clear passages and drive drug molecules into cells, the approach shows promise in reducing costs and increasing efficacy while minimizing risks.
Researchers found a unique resonance phenomenon in the crevice cave that amplifies and lengthens sound at a specific frequency, which may have impacted beliefs associated with it. The study suggests that this resonance could be an exceptional sound phenomenon for the people living in the region centuries ago.
Researchers have observed simultaneous oscillations of spin and orbital angular momentum in weak and strong coupling regimes, driven by optically synthesized magnetic fields. The findings offer a general framework to explore spin-orbit couplings in higher-order regime.
Researchers will investigate topological acoustics to improve computing speeds, reduce power usage in smartphones, and enhance sensing capabilities. The new center aims to harness the full power of acoustic waves to reveal extraordinary properties of sound.
Researchers from FAU Harbor Branch deployed an autonomous wave glider to survey marine managed areas off Puerto Rico, recording grouper mating calls and determining spatiotemporal distribution of the two species. The study highlights the importance of spatial and temporal expansion of existing regulations to protect threatened species.
Acoustics researchers have decomposed sound into its three basic components, whistles, clicks, and hisses, using ideas from auditory perception, fuzzy logic, and perfect reconstruction. The new method emerges as the winning way to decompose most sounds in a listening test.
The study used a battery-powered acoustic array to record Goliath grouper sounds at an artificial reef, assessing their presence by measuring acoustic activity and habitat distribution. The results showed that the model can be used to automatically process large amounts of acoustic data and provide detailed movements of marine organisms.
Researchers developed methods to emphasize higher-frequency components of bone-conducted speech signals, improving intelligibility in noisy environments. The study's findings have potential real-life applications in BC-type hearing aids and auditory augmentation.
Scientists have identified a genetic locus associated with voice pitch, found in the ABCC9 gene, which influences voice characteristics in both men and women. The study also reveals links between voice pitch and cardiovascular health, highlighting the complex relationship between vocal traits and human biology.
Researchers at Shinshu University developed high-performance source-shifters using acrylonitrile butadiene styrene (ABS) resin, employing inverse design and topology optimization. The optimized structures can reduce the difference between emitted pressure fields to as low as 0.6%, enabling effective acoustic location camouflaging.
A laboratory study found that exposure to background traffic noise, even at 40 dB, significantly impairs concentration and perceived workload. Researchers also highlight the difficulties in avoiding high-frequency noise indoors due to reduced vehicle speeds.
A software program designed by Timothy G. Leighton predicts the environmental sounds of other planets and how human voices might change in distant worlds. The program uses acoustics and planetary science communities to learn about properties such as chemical composition, atmospheric temperature changes, and roughness of the ground.
A new study reveals that our perception of difficulty in shouting upwind is incorrect. It's not the wind itself that makes it hard, but rather our inability to hear ourselves due to the convective attenuation effect. The study found that sound carries better within the first 100 meters upwind, making it easier for others to hear us.
A new method for estimating sound direction using monaural cues has been proposed by researchers at Japan Advanced Institute of Science and Technology. The approach uses modulation in the frequency spectrum of the received signal to detect the signal direction, achieving accurate estimates even with human monaural hearing.
Researchers at Aalto University have developed new textiles that change shape when heated, providing adjustable aesthetics and potential applications in health monitoring and thermal insulation. The innovative fabrics use liquid crystalline elastomers, which can respond to heat, light, or other stimuli.
A new study suggests that office noise levels between 50 decibels can boost physiological well-being, while loud noises above 50 decibels decrease it. Researchers found that even low sound levels trigger a higher stress response, highlighting the need for optimal acoustics in workplace design.
Researchers at the University of Tsukuba have developed an optoelectronic resonator that enhances the sensitivity of an electron pulse detector, allowing for ultrafast electronic characterization of proteins or materials. This breakthrough may aid in the study of biomolecules and industrial materials.
Acoustic engineers use techniques like impulse responses to reproduce dialogue and other sounds in film. This process creates a believable audio experience for viewers, drawing them into the story. By carefully balancing dialogue, effects, and music, sound mixers achieve cinematic magic.
The Lombard effect is a cycle where individuals speak louder to be heard over background noise, increasing overall din. Researchers propose technology solutions and design changes to minimize the effect, such as individualized conversations via smart earbuds or altering wall absorption in spaces.
Researchers developed a machine learning algorithm to identify cough sounds and determine if someone has pneumonia, aided by room impulse responses. The algorithm can work in any environment, facilitating non-face-to-face treatment and reducing medical costs.
The Acoustical Society of America will hold its 183rd meeting in Nashville from Dec. 5-9, bringing together experts to share experiments and applications on diverse topics such as machine learning and medical diagnostics. Lay language papers will also be shared, providing summaries of presentations written for a general audience.
Researchers at MIT have developed a machine-learning model that captures how sounds propagate through spaces, allowing for accurate visual renderings of rooms. This technique has potential applications in virtual and augmented reality, as well as improving AI agents' understanding of their environment.
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 found that infants differentiate sounds based on neighboring sounds and vowel durations. Their study suggests that babies can learn the speech contrasts of their language through naturalistic speech data.
A new study demonstrates bound vortex light on optical chips by simulating gauge fields of cosmic strings. The research team created a deformed photonic graphene inspired by cosmic strings, which can generate and transport optical vortices and control photon orbital angular momentum.
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.
The €15.7 million AUFRANDE project aims to generate industry-relevant research by employing 64 early career doctoral researchers from French and Australian universities. Researchers will receive training and support, including annual workshops and group events, to foster high-performing early-stage researchers.
A team of researchers from Kyushu University has developed an olfactory sensor capable of identifying individuals by analyzing the compounds in their breath. The system, combined with machine learning, achieved an average accuracy of over 97% in authenticating up to 20 individuals.
A new camera system developed by Carnegie Mellon University researchers can reconstruct sound vibrations with extraordinary accuracy, capturing isolated audio without inference or a microphone. The dual-shutter vibration-sensing system uses two cameras and a laser to detect high-speed, low-amplitude surface vibrations.
Researchers at the University of Bristol have discovered that moth wing scales can absorb up to 87% of incoming sound energy, even when placed on an artificial surface. This finding has huge implications for building acoustics and travel industries, with potential applications for ultrathin sound absorbing panels.
SourceUniversity of Bristol·JournalProceedings of the Royal Society A Mathematical Physical and Engineering Sciences·TypeComputational simulation/modeling·DateJun 14, 2022
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.
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.
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 at Duke University have developed a device that manipulates particles and cells using complex sound waves, enabling selective pairing of individual cells to measure adhesion forces. This technology could lead to personalized medicine by allowing doctors to determine treatment for individual cancer patients.