| 摘要 |
PURPOSE:To control noise in real time and to control also noise from plural noise sources by extracting a signal separated from a noise signal of independent system from a signal from an error detector and applying processing so as to minimize the signal. CONSTITUTION:Plural noise signals detected by one error detector 8 are given to an arithmetic circuit 10, from which noise signals for each noise source are separated. In this separation, a signal controlling plural adaptive filters 4a - 4n and being an output of signal processing circuits 5a - 5n and inputted to the arithmetic circuit 10 is used to input transfer function information of noise sources 1a - 1n and the subtraction processing method is used to separate each noise signal sequentially. The separated noise signal is extracted by extraction devices 11a - 11n and inputted to the signal processing circuits 5a - 5n. The arithmetic processing is implemented independently to each noise source and the environment minimizing noise at the listening point is attained. Thus, the minimum condition environment of noise at the listening point is created in real time for plural noise sources. |
