Designed to reduce cabin noise further, such as electronic whine. Systems use one or more microphones to pick up noise and use the stereo to introduce an out-of-phase signal from the noise, which has the effect of reducing the noise level.
BMW and Porsche go in the opposite direction and actually amplify the engine noise in some models.
Currently available on select models from Ford, Honda, Infinity. The manufacturing cost is fairly minor if a stereo is already included. It can be quite complex and time-consuming to engineer since the listener position and microphone positions can greatly affect the results.
Hardware implemented with the mid-year 2021 Model S and X and activated with the Dec-2021 software release 2021.44.25.
I am familiar with this technology and since the car has a mic in the cabin and an audio system it seems it could be implemented with software. These systems work best on low frequency noise but the low cabin noise level could be dramatically improved.
Nonwoven Network sells to several top car manufacturers a nonwoven product for wheel well liners, head liners, liners between engine and cabin, etc. It is very effective. Tesla needs it also as a trunk and frunk liner. www.nonwovennetwork.com
If Tesla used it, they wouldn't need an active product at all.
I'm not voting this up because I think before we start cancelling noise with anti-noise (which, by the way, may involve licensing some costly patents held by Bose) Tesla should first exploit all sensible options to stop noise from entering the cabin in the first place: Improved noise insulation from the wheel wells