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    • 6. 发明授权
    • Noise controller
    • 噪音控制器
    • US5499302A
    • 1996-03-12
    • US455138
    • 1995-05-31
    • Masaaki NagamiKazuya SakoMasahiro BabasakiKazuhiro Sakiyama
    • Masaaki NagamiKazuya SakoMasahiro BabasakiKazuhiro Sakiyama
    • G10K11/178G10K11/16
    • G10K11/1784G10K2210/30232G10K2210/3033G10K2210/3045G10K2210/3049G10K2210/3052G10K2210/503
    • In a noise controller which forms a noise cancelling sound having a phase opposite to and a sound pressure equal to those of a noise infiltrating into a closed space, any deviation in its transfer characteristics from the initial equalization is easily checked and judged owing to the provision of an adaptive filter which automatically varies the filter coefficient and forms a cancelling signal for forming a cancelling sound, a coefficient updating means which updates the filter coefficient based on an error signal after the noise has been cancelled, a simulated transfer characteristics compensation means which forms the initial equalization by simulating transfer characteristics of a transmission path via the space in which the noise is to be cancelled and forms a reproduced reference signal, a white noise generating means which generates white noise to check the initial equalization, and an initial equalization judging means which judges the accuracy of the initial equalization based on a ratio (S/N) of the reproduced reference signal obtained from white noise to the error signal. A change in the conditions for cancelling noise is detected in the closed space, and any deviation from the initial equalization is judged.
    • 在形成噪声消除声音的噪声控制器中,其噪声消除声音具有相当于与渗透到封闭空间中的噪声的相位相同的声压,因此容易检查其传输特性与初始均衡的偏差,并由于提供 自适应滤波器,其自动地改变滤波器系数并形成用于形成消除声音的抵消信号;系数更新装置,其基于噪声已被消除之后的误差信号来更新滤波器系数;模拟传送特性补偿装置,其形成 通过模拟通过要消除噪声的空间的传输路径的传输特性并形成再现的参考信号的初始均衡;产生白噪声以检查初始均衡的白噪声产生装置,以及初始均衡判定装置 其判断基于初始均衡的准确性 根据从白噪声获得的再现参考信号与误差信号的比(S / N)。 在封闭空间中检测到消除噪声的条件的改变,并且判断与初始均衡的任何偏差。