| 摘要 |
PURPOSE:To surely detect a fault by generating a test sound signal sequentially from lots of amplifier speaker systems alternatively, checking whether or not a test sound signal is correctly generated in order through the collection of sound by a microphone and informing it to the user when a fault takes place. CONSTITUTION:When each of amplifier speaker systems is all normal, a test sound is sounded sequentially alternatively into a cabin from speakers SP1-SP6 according to the operation of a test sound generating means and the test sound is collected by a microphone 5 and discriminated to be normal. Moreover, when no test sound signal is included in the microphone output while the test sound generating means sends a test sound signal to an amplifier speaker system, the amplifier speaker system is discriminated to be faulty and it is informed to the user. Thus, a fault of a speaker is surely detected. |
