| 摘要 |
PURPOSE: A method for confirming an ear microphone state in a communication terminal is provided to recognize a switch-on in an ear microphone connected state by using the combination of a jack connection detection signal and a switch-on detection signal. CONSTITUTION: A controller monitors a jack detection signal and a switch detection signal(901). The controller decides whether a state change is generated in the signals(903). If so, the controller checks whether both of the signals are 'high'(905). If not, the controller performs corresponding operations(919), and if 'high', the controller reads right prior states of the two detection signals(907). The controller analyzes the read prior states to check whether both of the prior states of the detection signals are 'low'(909). If so, the controller mutes transmission and receiving(911). The controller checks the switch detection signal(913). The controller checks whether the switch detection signal is 'low'(915). If not, the controller returns to the step 913, and if 'low', the controller releases the transmission and receiving mute(917), and returns to a standby state(919). If both of the prior states are not 'low' in the step 909, the controller checks a 'high'-maintained time of the switch detection signal(921). The controller checks whether the maintained time is over a pre-decided time(923). If so, the controller automatically dials the last call number(927), and if not, the controller displays the last call number stored in a memory on an LCD(Liquid Crystal Display)(927).
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