Given that the general noise in cars (background hum of an engine on a freeway) is fairly predictable could a tech exist that just plays a generic opposing sound in a regular car, such as an mp3 track. This would enable your average user to experience this through a car stereo
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This already exists. Here is a quick description of what Acura does. I am sure others do similar.
[https://www.autobytel.com/car-ownership/technology/what-is-acura-active-sound-control-125813/](https://www.autobytel.com/car-ownership/technology/what-is-acura-active-sound-control-125813/)
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