Harman’s Road Noise Cancellation (RNC) technology minimizes unwanted noise from tires rolling across the road surface. RNC, enables auto makers to use lighter weight materials and improve fuel economy without compromising on vehicle noise levels.
Auto makers have been making cars lighter, using less noise noise-dampening insulation in the car’s interior.The use of lighter materials, however, increases road noise inside the vehicle and compromises the audio experience of infotainment system.
The Harman HALOsonic noise management suite offer Road Noise Cancellation s(RNC) which detects and neutralizes unwanted road noise,
RNC is based on the principle of using “anti-noise” to counteract road noise.
The chassis of the car is fitted with accelerometers to measure correlation of vibration coming from the road and the resulting noise inside the cabin.
Then a proprietary algorithm in the controller creates inverse sound waves (coming from each speaker) through the car’s audio system to cancel out the noise caused by the road-induced vibration
With RNC, Harman uses its patented True Audio technology to ensure that only unwanted engine or road noise is cancelled, while preserving music signals in a similar audio range.
HALOsonic was co-developed with Lotus Engineering using patented Active Noise Control Technologies
HALOsonic also includes Engine Order Cancelation (EOC) and internal as well as external Electronic Sound Synthesis.
External ESS (eESS) generates motor sound for hybrids and electric vehicles, to notify pedestrians that a car is near, increasing safety both for drivers and other road users. Internal ESS (iESS) serves to generate unique sound signatures for vehicles to contour and accentuate the engine sound.