SYSTEM OF SLAVE STATION SELECTIVE CALLING AND SIMULTANEOUS BROADCASTING IN PUBLIC RELATION SYSTEM

摘要

PURPOSE:To make the starting point of time equal for a sound signal amplifier of a slave station, by transmitting a slave station calling signal from a master station or again a group signal after the end of transmission of a general signal. CONSTITUTION:The master station transmits the general signal FW in succession to the group signal FG or individual callout signals FA, FB and transmits again the group signal FG after the end of transmission of the general signal or the individual callout signals. When the slave station detects the first group signal FG, a counter 5 is operated and a general individual call detector 4 is operated. When the general signal or the individual callout signal is received, the detector 4 gives continuously an output to an AND gate 6. When the group signal FG is received again, since the counter gives an output to the AND gate 6, a voice signal amplifier 7 is started to start the amplification of a sound signal received at a receiver 1.