ANCS - Active Noise Canceling System

This is not a true active safety system, but we mention it for the sake of completeness, as it will help to relax the driver and thus make him more attentive.

The system is based on the possibility of creating unwanted sound (noise), interfering with another, which suppresses it. Of course, you want speakers that produce mutable audio and continuous electronic controls that can respond in milliseconds. Launched by Nissan in 1992 in collaboration with Hitachi, it manages to reduce engine noise when accelerating at high frequencies to 10 Hz by about 250 dB.