Patent ID: 6397087
Filing Date: 2002-05-28
Classification: H04B,H04M,H04R

Abstract:
A device for controlling the connection of a built-in type ear-microphone with a portable radio terminal, the ear-microphone including a speaker and microphone, and the portable radio terminal including a speaker and microphone, the device comprising:a vocoder including speaker and microphone amplifiers of the portable radio terminal and speaker and microphone amplifiers of the ear-microphone; a first logic combination means for logically combining a signal output from the ear-microphone speaker amplifier and a signal output from the ear-microphone microphone so as to prevent generation of noises due to a short-circuit of a microphone signal and a speaker signal when an ear-microphone plug is inserted in an ear-microphone jack; a comparator for comparing an electric signal sensed at the ear-microphone jack with a reference voltage; a second logic combination means for logically combining an output of the first logic combination means and an output of the comparator to generate a jack detection signal; and a central processing unit for generating a control signal for enabling the vocoder to switch an audio signal path from the portable radio terminal amplifiers to the ear-microphone amplifiers, upon detection of the jack detection signal during a call.