Public Address System

Public Address System (PA system): A public address system (PA system) is an electronic system comprising microphones, loudspeakers, and related equipment.

IP Public Address System

IP Public Address System refers to PA paging and intercom systems that use an Internet Protocol (IP) network, instead of a central amplifier, to distribute the audio signal to paging locations across a building or campus, or anywhere else in the reach of the IP network, including the Internet. At the transmission end, a computer application transmits a digital audio stream via the local area network, using audio from the computer's sound card inputs or from stored audio recordings. At the receiving end, either specialized intercom modules (IP speakers) receive these network transmissions and reproduce the analog audio signal.

Wireless Mobile Telephony (WMT) PA Systems

Wireless Mobile Telephony (WMT) PA Systems refers to PA paging and intercom systems that use any form of Wireless mobile telephony system such as GSM networks instead of a centralized amplifier to distribute the audio signal to paging locations across a building or campus, or other location. The GSM mobile Networks are used to provide the communication function. At the transmission end, a PSTN Telephone, mobile phone, VOIP phone or any other communication device that can access and make audio calls to a GSM based mobile SIM card can communicate with it. At the receiving end, a GSM transceiver receives these network transmissions and reproduce the analogue audio signal via a Power Amplifier and speaker.