| 摘要 |
PURPOSE:To reduce in-car transmission of a warning sound by providing an adaptive type controller in which a reverse transmission characteristic relating to a transmission characteristic of an in-car space transmission system is identified by a reference signal and an input of a microphone to control an output sound of an in-car speaker through an amplifier so as to minimize an input of the microphone. CONSTITUTION:Since a warning sound generated from an out-car speaker 7 is transmitted also in a car room, in order to reduce this transmission, an adaptive type controller 3, based on a reference signal synchronized with rotation of a drive motor 4 from a tachometer 5 and an input of a microphone 9, identifies a reverse transmission characteristic relating to a transmission characteristic of an in-car space transmission system to control an amplifier 10. In this way, an output sound of an in-car speaker 11 is controlled. As a result, transmission of the warning sound to the inside of a car can be reduced by minimizing the input of the microphone 9. |
