HYUNDAI’S NOISE CANCELLATION TECHNOLOGY DELIVERS AN IMMERSIVE IN-CABIN EXPERIENCE
Next time you’re traveling in your car, turn off your radio and listen. If you’re in a popular consumer model, you may experience a noticeable level of in-cabin noise. Whether it’s from the engine, tires, or wind, these irritating sounds can cause driver fatigue over long distances and impact safety.
In the past, most auto manufacturers used passive acoustic dampening material to help deaden sound. But that added vehicle weight increased fuel consumption. So, the active noise cancellation technology (ANC) employed in high end audio noise-cancelling headphones was adopted and deployed in millions of vehicles. While ANC is effective for cancelling out a vehicle’s narrow-band engine noise, it wields little influence suppressing the wideband noise generated by the tires (road noise).
At a joint technology workshop with industry leaders Analog Devices, Inc. (ADI) and Hyundai Motors (HKMC), a discussion ensued about road noise cancellation. ADI is a full solutions technology company known for solving the toughest engineering challenges. Hyundai Motors, a pioneer in the automobile industry, wished to distinguish its brand and develop a technology that would dramatically reduce noise in its vehicles.
The two teams collaborated to deploy the industry’s first all-digital road noise active noise control (RANC) system. The challenge was to implement RANC in a practical and easily manufacturable way. In early 2020, the groundbreaking RANC system was accelerated to mass production and incorporated in Hyundai’s flagship GV80 cars.
Accelerometers located near every tire, pick up vibrations in the tires and suspension.
The Adaptive Controller's (DSP) proprietary algorithm counteracts the vibration noise within milliseconds with an equal and opposing sound wave transmitted through the speakers.
Simultaneously, microphones measure sound in the cabin and ensure a precise noise reduction signal is generated.
Speakers within the cabin close the signal loop and the offending sound wave is reduced. The result is a quieter internal zone around each passenger and an audibly more comfortable driving experience.