A new approach achieves independent listening zones within a car by using small, modified speakers to produce directional sound fields and a signal processing strategy that optimizes the audio signals used to drive each of the speakers. The new design will be presented at the 21st International Congress on Acoustics (ICA 2013), held June 2-7 in Montreal.
Today, car cabins often reverberate with the sounds of music, video soundtracks, navigation system instructions, telecommunications, and warning sounds. Problems arise, however, when occupants of the same car want to listen to different programs. The driver may require navigation system instructions and warning sounds, while the kids in the back seat want to watch a movie. Intergenerational audio conflict might be avoided, however, with a new type of car speaker system.
“We’ve begun developing an audio reproduction system capable of producing independent listening zones in the front and rear seats of a car cabin – without the use of headphones,” says Jordan Cheer, Research Fellow in Active Control at the Institute of Sound and Vibration Research at the University of Southampton, UK. “Our system uses standard car audio loudspeakers, which are usually mounted in the doors of the car, at low frequencies, and these are complemented by a set of small loudspeakers mounted to the headrests.”
“Our complete system is able to achieve a significant level of isolation between the front and rear seating positions to provide independent listening zones for the front and rear cabin occupants,” Cheer says.
The necessary degree of isolation between the two listening zones depends on the audio program, he explains. For example, if speech is being reproduced at the front seats and pop music is playing in the rear seats, a higher level of isolation is required than if pop music were playing in both zones.
Future work on the system will factor in the effect of the audio program selection on the required system performance. Based on this information, the researchers will continue to explore improvements to both loudspeaker configuration and digital signal processing.
Presentation 1aSP9, “Design and implementation of a personal audio system in a car cabin,” is in the morning session on Monday, June 3. Abstract: http://asa.aip.org/web2/asa/abstracts/search.jun13/asa117.html
MORE INFORMATION ABOUT THE ICA 2013 MONTREALUSEFUL LINKS:
This news release was prepared for the Acoustical Society of America (ASA) by the American Institute of Physics (AIP).ABOUT THE ACOUSTICAL SOCIETY OF AMERICA
Improvement of the operating range and increasing of the reliability of integrated circuits
09.11.2016 | Technologie Lizenz-Büro (TLB) der Baden-Württembergischen Hochschulen GmbH
New algorithm for optimized stability of planar-rod objects
11.08.2016 | Institute of Science and Technology Austria
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine