Cleveland, Ohio – Creating a quiet car cabin typically demands thick glass on windows and windscreens, sound-absorbent material for seats, and lots of foam to muffle engine and road noises.
Those system add weight, lowering vehicle performance and fuel economy. Supplier Analog Devices hopes to eliminate those weighty add-ons using the same sort of noise cancellation technologies used in high-end headphones. Microphones would record road noises, and speakers would generate an inverse signal, countering those noises before they reached drivers and passengers. Hyundai plans to begin using the Road-noise Active Noise Control (RANC) technology soon.
“It does not block outside sounds like emergency vehicle sirens and only cancels road noise caused by traction of the tires against the pavement,” Analog Devices officials said in an email. “The road noise is especially noticeable with electric vehicles (EVs) that do not exhibit engine noise.”
Dr. Kang-Duck Ih, Research Fellow, Hyundai, said, “The low latency guaranteed by [Analog Device’s Automotive Audio Bus (A2B)] enabled us to implement this groundbreaking RANC technology and accelerate its deployment to mass production.”
Hyundai’s system can analyze various types of noise in real-time and produce inverted soundwaves. For example, there are different types of road noises that the new technology can process, such as resonant sounds created between tires and wheels or rumble sounds coming up from the road.
A2B reduces cabling weight by up to 75% and improves automotive fuel efficiency by eliminating the need for weighty glass and foam.
Fuel economy improvements are strictly related to weight reduction from removing sound deadening materials or traditional analog noise-cancellation systems which require more wiring.