Sound masking system for open plan office

摘要: This invention relates to a system for masking conversation in an open plan office. A conventional generator of electrical random noise currents feeds its output through adjustable electric filter means speaker clusters plenum above the office space. Each cluster has two speakers trigonal prism-shaped cabinet, symmetrically disposed about axis symmetry, oriented be vertical. The arrangement is such that, throughout area, including below clusters, background sound energy level horizontally space generally constant value except modification which provides quiet region cluster. By proper spacing along region, transmission acoustic ceiling space, one cannot distinguished at distance order 15 feet or more.