抄録
We developed a communication system using internet protocol technology for broadcasting stations. First, networks are established between a private branch exchange (PBX) server and areas such as studios, sub-control rooms, local broadcasting stations, and the incident scenes where communication systems are used. The PBX server returns the audio signal to each user by mixing other audio signals for each group and produces arbitrary conversation groups for members who want to talk. Access points are established in the studios and sub-control rooms, so that wireless LAN communication is available. Each terminal can be connected to a headset (neck-strap-type earphone with a microphone) and can be supplied with power from an external battery pack, which runs for approximately eight hours. A connection from outside wires (city telephones) or extensions to the PBX server via a gateway can combine two different functions of existing communication systems, intercom and telephone for coordination. An existing intercom system can operate together with the new communication system if both systems are connected via a gateway.
