PA system(public address system)

A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loud speakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. Typical applications include sports stadiums, public transportation vehicles and facilities, and live or recorded music venues and events. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution. Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations such as schools, stadiums, and passenger vessels and aircraft. Intercom systems, installed in many buildings, have both speakers throughout a building, and microphones in many rooms so occupants can respond to announcements. PA and Intercom systems are commonly used as part of an system. It’s the integration of fire alarm broadcast, business broadcast and background music broadcast. It runs on both LAN and WAN. Digital transmission solves the problem of signal attenuation and environmental electromagnetic interference during the long distance. What’s more, it’s easy for contractors to be installed, for the system adopts common network structure. System Function 1) The host has 4 internal modules for audio sources. We’ve already provided our users with emergency message voice in the host. Meanwhile, users could change the voice freely.