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?
In: 67
Theoretically, possible but it would be very difficult and the result is very likely to be uneven.
Active noise reduction relies on creating a counter sound pressure to reduce the amplitude of the “noise” signal. The problem is this noise is not even across large spaces and reflecting surfaces, moving furniture and people etc all serve to reflect noise sources. It would be very difficult for a small number of speakers to counter this throughout the space (and the system would have to “measure” or calculate the direct and reflected noise at all points in the space and then somehow calculate a counter wave.
It could most easily do so for some low frequency constant noise perhaps. But the worst case might be suppressing the noise in one area only to amplify said noise in another if the “cancelling” wave reinforces the noise instead.
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