REDUCING AUDIBILITY OF SENSOR NOISE FLOOR IN A ROAD NOISE CANCELLATION SYSTEM

摘要

A road noise canceling (RNC) system may include a controller and attenuator to reduce the audibility of the noise floor caused by the system's vibration sensors. The level of the opposite noise at the location in the passenger compartment, which can be attributed to the sensor noise floor, can be estimated. The actual sound level in the passenger compartment can be measured or estimated, and the sensor noise floor component is algorithmically removed. To reduce the audibility, if any, the difference between the predetermined threshold and levels can be compared to determine the amount of attenuation to be applied to the opposite noise signal.