title: Active noise reduction.
authors.affiliation: ProTech Communications Inc., Shelton, Conn, USA.
authors.forename: Joanna
authors.initials: J
authors.lastname: Lipper
mesh_terms: D004430:Ear Protective Devices; D006801:Humans; D009623:Noise, Occupational / Q000517:prevention & control*; D013672:Technology; D014481:United States