Hyundai has announced the development of the world's first Road Noise Active Noise Control (RANC) system. The first-ever system dramatically reduces noise within the cabin of a vehicle.
RANC builds on the company's current Active Noise Control (ANC) technology, which actively reduces noise by emitting soundwaves inverted to incoming noise. ANC is a software-driven technology that analyses the in-cabin sound to decrease engine and road noise, versus than the passive method of blocking noise through sound insulation.
The existing noise insulation method involved sound insulations and dynamic dampers, which not only increased weight but also failed to block the buzzing infrasound completely. In contrast, ANC utilizes much lighter parts like microphones and controllers to control the noise and reduces infrasound more efficiently. The technology is already available in some Hyundai vehicles.
However, due to the limitations of noise measurement and analysis technology, the existing ANC was only able to be utilized when noise was constant and the occurrence of the noise predictable. The company's current ANC technology has been most commonly used to counteract constant engine noise. Given that it only takes about 0.009 second for road or engine noise to reach the passenger, the current technology was limited.
With the first-ever RANC technology, Hyundai is able to greatly improve in-cabin quietness. The new 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.
The working principle of RANC is as follows: using an acceleration sensor, RANC calculates the vibration from the road to the car and the control computer analyzes road noise. As its computation and signal transfer speeds are optimized, it only takes 0.002 second to analyze the noise and produce an inverted soundwave, generated by the DSP (Digital Signal Processor). The microphone constantly monitors the road noise cancelation status, and sends the information to the DSP. RANC is able to conduct accurate noise analysis and rapid computation to combat road noise for the driver's seat, the passenger seat and rear seats separately.
Based on tests evaluating road surface, vehicle speed, and different seating positions, RANC was able to reduce in-cabin noise by 3dB. That 3dB level is roughly half the noise level as compared without RANC. Thanks to this achievement, the company can potentially decrease the amount of unsprung weight in a vehicle, utilizing fewer sound-insulating parts and dampers as compared with before.
Hyundai went through six years of research and development for the mass production of RANC. Furthermore, the mass production phase was carried out with global car audio company, Harman to increase degree of competition.
The technology will begin to be applied to an upcoming Genesis model.
RANC builds on the company's current Active Noise Control (ANC) technology, which actively reduces noise by emitting soundwaves inverted to incoming noise. ANC is a software-driven technology that analyses the in-cabin sound to decrease engine and road noise, versus than the passive method of blocking noise through sound insulation.
The existing noise insulation method involved sound insulations and dynamic dampers, which not only increased weight but also failed to block the buzzing infrasound completely. In contrast, ANC utilizes much lighter parts like microphones and controllers to control the noise and reduces infrasound more efficiently. The technology is already available in some Hyundai vehicles.
However, due to the limitations of noise measurement and analysis technology, the existing ANC was only able to be utilized when noise was constant and the occurrence of the noise predictable. The company's current ANC technology has been most commonly used to counteract constant engine noise. Given that it only takes about 0.009 second for road or engine noise to reach the passenger, the current technology was limited.
With the first-ever RANC technology, Hyundai is able to greatly improve in-cabin quietness. The new 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.
The working principle of RANC is as follows: using an acceleration sensor, RANC calculates the vibration from the road to the car and the control computer analyzes road noise. As its computation and signal transfer speeds are optimized, it only takes 0.002 second to analyze the noise and produce an inverted soundwave, generated by the DSP (Digital Signal Processor). The microphone constantly monitors the road noise cancelation status, and sends the information to the DSP. RANC is able to conduct accurate noise analysis and rapid computation to combat road noise for the driver's seat, the passenger seat and rear seats separately.
Based on tests evaluating road surface, vehicle speed, and different seating positions, RANC was able to reduce in-cabin noise by 3dB. That 3dB level is roughly half the noise level as compared without RANC. Thanks to this achievement, the company can potentially decrease the amount of unsprung weight in a vehicle, utilizing fewer sound-insulating parts and dampers as compared with before.
Hyundai went through six years of research and development for the mass production of RANC. Furthermore, the mass production phase was carried out with global car audio company, Harman to increase degree of competition.
The technology will begin to be applied to an upcoming Genesis model.
