We’re all familiar with noise cancelling headphones. I’ve got some that I use for transatlantic trips, and they’re great for minimising any repeating background noise.
Twenty years ago, when I was studying A-Level Physics, I was also building a new PC. I realised that, if I placed a microphone inside the computer case, and fed that into the audio input on the soundcard, I could use software to invert the sound wave and thus virtually eliminate fan noise. It worked a treat.
It doesn’t surprise me, therefore, to find that BOSE, best known for its headphones, are offering car manufacturers something similar with “road noise control”:
With accelerometers, multiple microphones, and algorithms, it’s much more complicated than what I rigged up in my bedroom as a teenager. But the principle remains the same.
Source: The Next Web