STMicroelectronics is enabling more acoustically comfortable cars, with its new sensor for road-noise cancellation (RNC) through active noise-control (ANC) techniques. Cars have traditionally been defined by engine performance, exterior design, and powertrains, but drivers and passengers are increasingly focused on comfort.
Indeed, while Electric Vehicles (EV) are intrinsically less noisy than internal combustion engine cars (ICE), car makers are focused on further lowering in-cabin noise due to wheel or vibration. These efforts aim to allow passenger to better enjoy the journey in a quieter ambient environment.
Noise cancellation algorithms, working with an array of sensors installed throughout the vehicle, measure the ambient sounds, and eliminate vibration using noise-cancelling waveforms that act as anti-vibration (cancelling) sounds.
AIS25BA
MEMS digital output motion sensor: low noise, high bandwith, 3-axis accelerometer with TDM interface
The sensor has the lowest electrical noise in the market, which helps vehicle engineers achieve the calmest possible in-car environment. On the other hand, it has the fast response/low latency needed by the RNC system to calculate corrective waveforms in real-time as well as wide bandwidth to capture disturbances across the full spectrum of sound frequency relevant for the application. Its wide temperature range and mechanical robustness allows placement in the harshest places of today’s vehicles: near the engine or electric drive as well as close to wheels and suspension.
