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The sono is a working prototype that purports to cancel out the sounds of the city using a window attachment to "dial down" the noise. it purportedly works similarly to how canceling headphones ..., sound control electronics many different types of electronic devices are used throughout the acoustical industry for sound control, analysis, or inspection. in order to determine or provide the most effective noise control solution, a variety of electronic devices are available..
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Canceling the high frequencies is very hard because the wavelengths are very short, and the noise is, well, noisy and thus not concentrated at one frequency or direction. however, you can block that noise with baffles. low frequencies are much more difficult to block or attenuate.