| 摘要 |
PURPOSE: A switch phone is connected to a PA(Pro Audio) broadcasting system and the phone is available for calling and transceiving freely in each room, thereby enabling a listener to listen to a broadcasting content. CONSTITUTION: A call network unit(10) processes a voice signal. A data communication unit(20) performs data communication. A voice amplifier(40) amplifies the voice signal and provides the call network unit. A display unit(60) displays identification number corresponding to each location. A control unit reads a signal inputted form a key input unit and controls the call network unit, the voice amplifier unit, the data communication unit, the display unit and the key input unit. |
