| 摘要 |
PURPOSE:To prevent sudden disconnection of speaking by performing a prescribed report by a reporting means before disconnection of speaking. CONSTITUTION:During speaking, a signal obtained by A/D conversion of the reception signal received by a reception part 5 in an A/D converter 12 is taken as a reception field intensity signal at intervals of a prescribed time, and a prescribed character is flickered or lit on a display device 15 by the display control of a control part 11 if said signal is lower than a first reference value. Simultaneously, an alarm tone signal related to the alarm tone generated by an oscillator is sent to a transmission base band part 9 through an adder 17, and this alarm tone is emitted from a telephone or the like on the speaking destination side. When the reception field intensity signal is lower than a second reference value over a prescribed time thereafter, the speaking state is released to set the waiting reception state. Thus, sudden disconnection of speaking is prevented. |
