| 摘要 |
PURPOSE:To realize the sufficient suppression of noises although the noise section lasts for a long period of time, by storing plural post samples from the outpot of a signal switching means and producing the linear combination of the sampled value and the set coefficient in the form of a substitute signal. CONSTITUTION:The optimum estimation coefficient in a short section of an input signal is obtained through a linear estimation coefficient calculating circuit 1 and fed to a noise detecting circuit 2. The circuit 2 calculates the estimated value from the given estimation coefficient and then calculates the difference between said value the input signal. Then the presence of noise is decided when the absolute value of the difference is larger than the set threshold value. Thus A noise detecting trigger is produced. A signal switching circuit 3 leads the input signal to an output terminal when no noise is detected and leads a substitute signal to the output of eliminate the noise in case the noise detecting trigger is applied. |
