++《PHILIPS 音频系统手册》Sound System Reference ManualPublic AddressSound ReinforcementPhilips Communication & Security Systems Breda The Netherlands Tel (+31) 76 5721 407 Frans van der Meulen 1958 Jubilee Edition 1998Sound System Reference Manual IntroductionSound systems are used for amplification of speech or music to enhance intelligibility or loudness by electro-acoustic means in order to serve an audience with a higher degree of listening comfort. A public address distribution system is designed primarily to carry live and recorded messages, signal tones and background music (if required), from several different sources, to a number of selectable remote areas. Common applications would be: hotels, restaurants, railway stations, airports, factories, oil platforms, office buildings, schools, shopping……
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