SPEAKER AUTOMATIC FAULT DETECTION SYSTEM

摘要

PURPOSE: A speaker automatic fault detection system is provided to manage a speaker or a speaker system efficiently by automatically diagnosing one or a few speakers. CONSTITUTION: In a speaker automatic fault detection system, a frequency generator(110) generates a test signal which has a specific frequency within a specified range. The frequency of the test signal is varied within the specified range, and a digital-to-analog converter(120) changes a test signal generated from frequency generator into an analog signal. A speaker(130) generally has impedance of 4Ω or 8Ω, and the impedance is changed according to the change of the frequency and power inputted to a speaker. A failed state of a speaker is determined by using the difference of the impedance changed according to the frequency or the power, and the fault detection circuit(140) measures the impedance of the signal input terminal inputted to the speaker. The fault detection circuit measures the impedance of the test signal having the specific frequency.