Optical spectrometers are instruments with a wide variety of uses. By measuring the intensity of light across different wavelengths, they can be used to image tissues or measure the chemical composition of everything from a distant galaxy to a leaf. Now researchers at the UC Davis Department of Biomedical Engineering have come up a with a new, rapid method for characterizing and calibrating spectrometers, based on how they respond to “noise.”
Rendering of prism and spectrum
Optical spectroscopy splits light and measures the intensity of different wavelengths. It is a powerful technique across a wide range of applications. UC Davis engineers Aaron Kho and Vivek Srinivasan have now found a new way to characterize and cross-calibrate spectroscopy instruments using excess “noise” in a light signal.
Spectral resolution measures how well a spectrometer can distinguish light of different wavelengths. It’s also important to be able to calibrate the spectrometer so that
People’s exposure to environmental noise dropped nearly in half during the early months of the coronavirus pandemic, according to University of Michigan researchers who analyzed data from the Apple Hearing Study.
Researchers at U-M’s School of Public Health and Apple Inc. looked at noise exposure data from volunteer Apple Watch users in Florida, New York, California and Texas. The analysis, one of the largest to date, included more than a half million daily noise levels measured before and during the pandemic.
Daily average sound levels dropped approximately 3 decibels during the time that local governments made announcements about social distancing and issued stay-at-home orders in March and April, compared to January and February.
“That is a huge reduction in terms of exposure and it could have a great effect on people’s overall health outcomes over time,” said Rick Neitzel, associate professor of environmental health sciences at U-M’s School of Public
Driver fatigue brought on by the monotonous drone of road roar and wind noise could soon be a thing of the past, as Jaguar Land Rover reveals new noise-cancelling technology.
Similar to how headphones with ANC (active noise cancelling) work, the new system uses sensors on each wheel to monitor vibrations. These are then used to produce a sound wave through the car’s audio system that cancels out the unwanted noise, particularly low-frequency sounds up to 300Hz.
The system debuts on the new Jaguar F-Pace, new Jaguar XE, and Range Rover Velar, but is likely to soon roll-out across the rest of the JLR range.
JLR explains how the system “calculates the opposite phase sound wave needed to remove the noise heard by the
Noise can make or break a dining experience, according to a laboratory study replicating common noise levels in restaurants.
The acoustic experts say the study proves that high noise levels can play a major part in a dining experience — along with the quality of the food and restaurant service.
“Our study not only shows that relaxing music at low noise levels increases food enjoyment but indicates that even ‘normal’ background noise levels in restaurants can be unpleasant to diners,” says lead author, Flinders University PhD candidate Mahmoud Alamir.
“We do not always recognise the cumulative effect of noise to our stress or annoyance levels, but we see how every one of us has sensitivity to noise in different ways.”
The study considered factors such as age, gender and noise sensitivity to background noise.
Accordingly, noise-sensitive people, as well as older people and females, reported lower enjoyment of food when
The environment in the Cordell Bank National Marine Sanctuary off the coast of San Francisco is not a refuge from the noise generated by ship traffic, the first underwater marine acoustic study of the region has shown.
Vessel and other human sound is not currently regulated in Cordell Bank National Marine Sanctuary, but sanctuary officials are trying to learn more about its impact on animals as part of efforts to evaluate and improve the management of the ecosystem.
Noise from human activity such as vessel traffic or offshore drilling can have an impact on the health of marine animals. For example, whales rely on sound to forage, communicate, navigate and avoid predators—processes that can be hindered by human-made noise.
“Noise levels we measured at some frequencies in the sanctuary were higher than those modeled for the Channel Islands National Marine Sanctuary near the Port of Los
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Qualcomm has launched a new 5G-ready processor in the Snapdragon 7xx series that is claimed to make next-gen cellular connectivity and advanced gaming features even more accessible. Welcome, the Snapdragon 750G SoC. Qualcomm’s latest mid-range 5G SoC is based on the 8nm process and uses the Kryo 570 core that is claimed to offer a 20% boost in performance, while the accompanying Adreno 619 GPU offers a 10% uptick in graphics prowess. Qualcomm says that its new SoC comes with an AI-based noise suppression tech that selectively reduces background noise for scenarios like voice chat while gaming. The AI-driven audio and voice communication suite is integrated into the new chip and is touted to offer crisp and clear voice chat experience.
The chipmaker claims that its new octa-core SoC offers a truly global 5G experience by bundling support for both mmWave and sub-6GHz bands, NSA and