The characteristics of automatic measurement of 4 kinds of audio product design product overview of the tester of the mobile phone (combination of receiver and transmitter), 2 channel telephone unit (headset drive unit and a micro loudspeaker), stereo headset and microphone, automatically determine the preset reference allowance. A XP Windows personal computer using a simple control system. The measurement data, such as the numerical data and the frequency response curve, can be used to store all measured data in the future. Optional
