ANC-R (Active Noise Control-Road) is a technology that suppresses road noise generated by vehicles. The technology compensates for the shortcomings of the current active noise control technology, which did not significantly affect road noise, and was realized by using an acceleration sensor with excellent response speed. The working principle of ANC-R is as follows. First, the acceleration sensor inside the vehicle measures the vibration transmitted from the road surface to the vehicle and sends it to the DSP (Digital Signal Processor). The DSP, acting as a noise control computer, analyzes the type and magnitude of noise in real-time to generate an out-of-phase sound wave, and then sends it to the speaker of the audio system to cancel the road noise. The ANC-R microphone continuously monitors road noise to help DSP improve noise reduction.