Method for reducing a digital noise signal in a digital input signal and circuit arrangement to carry out this method

摘要

The invention relates to a method for reducing a digital noise signal and a digital circuit arrangement to carry out this method. A sequence of low-pass-filtered signal values, which are derived from low-pass-filtered signal values determined earlier, and in which values are used which are buffer-stored at a sampling time, is generated from a digital input signal (Xe), comprising a digital useful signal and the digital noise signal. The low-pass-filtered signal (Xr) is used as the output signal (Xa) if the amount of the difference between the input signal (Xe) and the low-pass-filtered signal (Xr) lies within a pre-defined range (G). If the aforementioned amount lies outside the range (G), the input signal (Xe) is used as the output signal (Xa) and all temporarily stored values are replaced by the last input signal value. IMAGE