Apparatus and method for detecting a monitoring time interval in a frame structure

摘要

Frame assembly circuit 103 assembles voice data into frames. Silent interval identifier 104 identifies an interval during which no voice data is input, that is, a silent interval as a monitoring time. Modulator 107 modulates the frames and spreader 108 spreads the modulated frames. Radio circuit 109 carries out predetermined radio processing on the spread frames and the frames subjected to radio processing are transmitted from transmission antenna 110. When silent interval identifier 104 identifies the monitoring time, silent interval identifier 104 outputs a control signal notifying the receiver of the identification of the monitoring time.