Hyundai: quieter cabins

Hyundai Motor Group has announced the development of the first Road Noise Active Noise Control (RANC) technology, a system that reduces noise inside the car's interior.

In order to develop this technology, Hyundai has targeted the elimination of the three most common sounds when we are in the car. These are the sounds of wind, engine and road. Using an acceleration sensor, the RANC will calculate the vibration from the roadway to the car. Then, a computer will analyze the perceived sound and send this information to the Digital Signal Processor (DSP)." The latter will eliminate the sound in order to make the cabin quieter.

A little precision is added. Road noises emit sound waves. To cancel them, you have to produce a reverse sound wave, and that's what the DSP does. The whole process is done within 0.002 seconds.

Moreover, the system would be able to handle the noise perceived for all occupants in the vehicle. For example, the RANC could further lower the engine and road sound for the driver, while it would only decrease the road sound for rear passengers, all at the same time.

On the other hand, the Korean manufacturer has done several tests on the road, to realize that the RANC can reduce cabin noise by up to 3 dB less.

Gangdeok Lee, a researcher at the NVH Research Laboratory (Noise, Vibration and Harshness), says that "RANC is a remarkable technology that takes NVH technology to a new level."

The development of the RANC comes in response to a similar technology used by some of the brand's products, such as the Genesis G80. The "Active Noise Control (ANC)" also reduces ambient sound using inverted sound waves. However, the ANC is more limited. In order to function well, it must perceive constant and predictable sounds. It is mainly used to decrease the sound of the engine. THE RANC, on the other hand, can lower variable and unpredictable sounds.

ANC and RANC are much lighter technologies than conventional soundproofing methods. Indeed, they use microphones and regulators to control sounds and infrasound (read: low frequency sounds, imperceptible to the ear).

Hyundai mentioned that the RANC will be used in an upcoming model of its Genesis luxury division.

Post a Comment