Patent ID: 8024010

Claim:
A control apparatus for controlling a radio transmission device to transmit a speech signal in an event room, comprising: a detecting device that detects a movement of the radio transmission device in the event room; and a transmitting device that transmits first and second control signals to the radio transmission device depending on the detection, the first control signal switches the said radio transmission device on and the second control signal switches the radio transmission device off; wherein the detecting device comprises two detection units that are built into a door frame of the event room or in front of or behind the door frame in order to detect a direction of the movement of the radio transmission device, wherein the detection units comprise a localization unit that locates the radio transmission device in the event room, wherein the localization unit comprises a plurality of separate directional antennas, wherein the transmission device transmits the first control signal when the localization unit locates the radio transmission device in the event room and transmit the second control signal when the localization unit locates the radio transmission device out of the event room.