Sound filter, change the hard of hearing to easy to hear, so all sounds can be heard without being hard to hear

 Sound filter, change the hard of hearing to easy to hear, so all sounds can be heard without being hard to hear, it is circular tubes like microscopic floats, then let the hot air expand due to heat. electrically heat it to expand, creating a hole. Outside the ring tube is a circle that does not expand to squeeze. holes smaller than any wavelength do not let that wavelength pass. but the sound waves with large wavelengths, the speed goes faster, so let it pass and block other waves that need to be stopped.Change the voice, then after blocking other waves, we add waves with frequencies or by speakers in. make panels with good sound insulation

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