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    • 1. 发明授权
    • Active noise control system
    • 主动噪声控制系统
    • US5386472A
    • 1995-01-31
    • US842880
    • 1992-02-26
    • Donald P. PfaffNick S. Kapsokavathis
    • Donald P. PfaffNick S. Kapsokavathis
    • F01N1/06F02B27/00F02M35/12G10K11/178H03H21/00A61F11/06H04R3/02H04B15/00
    • G10K11/1788F01N1/065F02B27/001F02M35/125G10K11/1784H03H21/0012G10K2210/121G10K2210/12822G10K2210/3039G10K2210/3045Y02T10/146
    • A active noise control system having a digital signal processor programmed to function as adaptive digital filter with an output saturation control is described. The programmed adaptive filter has a specified maximum value for its output signal, above which the output signal becomes clipped and a condition commonly known as filter output saturation occurs. According to the described system, the filter output signal value is monitored to detect the occurrence of filter output saturation. When output saturation is detected, the normal adaptation of the filter is modified to reduce the value of the filter output signal to prevent the further occurrence of filter output saturation. Based upon the detection of filter output saturation, a power reference level is established to estimate the maximum average power that the output signal can contain without causing saturation. The adaptation of filter weighting coefficients is then scaled in accordance with the difference between the established power reference level and a computed average power associated with the filter output signal to prevent the occurrence of filter output saturation.
    • 描述了具有被编程为用作具有输出饱和度控制的自适应数字滤波器的数字信号处理器的主动噪声控制系统。 编程的自适应滤波器对其输出信号具有指定的最大值,其上的输出信号被限幅,并且通常称为滤波器输出饱和的条件发生。 根据所描述的系统,监视滤波器输出信号值以检测滤波器输出饱和度的发生。 当检测到输出饱和时,修改滤波器的正常自适应以减少滤波器输出信号的值,以防止进一步发生滤波器输出饱和。 基于滤波器输出饱和度的检测,建立功率参考电平以估计输出信号可以包含的最大平均功率而不引起饱和。 然后根据所建立的功率参考电平和与滤波器输出信号相关联的计算的平均功率之间的差来缩放滤波器加权系数的适应,以防止滤波器输出饱和的发生。