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"You are the Real Thing! I sent you a 1975 worn out, moldy reel to reel tape with original music from a cherished family member. The tape contained the only history of her music. We didn’t anticipate much would come out of it, since the tape was so old and dirty. As requested, you transferred it to a CD. As we listened the quality of the ..."

Acoustic wave filter

A device designed to separate sound waves of different frequencies. (Through electroacoustic transducers, such a filter may be associated with electric circuits.)