Could you make a speaker “play” noice canceling to make a cafe, or other noisy enviroment quiet?
Also, could this be used in another interesting way?
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[Yes, you can.](https://denoize.com) But it is expensive and limited in response. For large spaces it is easier and cheaper to install passive noise cancelling (which can be very good when the space is big).
Some cars use active noise cancellation using the cars’ sound systems. But we’ve used passive noise cancellation for decades with great results. Buicks offer up their QuietTuning technology, for example. In this case, active is still more expensive, but the weight savings are significant in comparison to passive solutions.
You can use similar effect to steer sound waves. If you’ve been to a big concert, you’ll have seen a line array (https://dt7v1i9vyp3mf.cloudfront.net/styles/news_large/s3/imagelibrary/l/livearrays0header-JZpirgddktktLor567UI3QUHaNqbR3FR.jpg) A big column of speakers hanging. There are a few issues with them, they are hard to set up. You need to get the curve just right to get the sound to go everywhere in the stadium. If you don’t get it right, you need to lower the array, tweak it and raise it again.
Now you can use arrays like this (https://pbs.twimg.com/media/DoGT5TuXkAArs1G.jpg). No curve, no third cable required to change the angle. You can steer the sound waves in software.
Same with the subs, they used to send sound in every direction. Now you can use subs bend the subs with slight delay to cancel the sound in one direction but not the other. Makes the audience happy and doesn’t annoy the neighbours as much.
It’s called “white noise”, this is already a thing used in loud public places like malls and stores.
It is basically static that is played as background noise.
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