A digital filter has an assigned filter function with assigned filter coefficients (bk), an input receiving input samples (xk), another input receiving confidence values (ck), and an output (out). Each input sample value (xk) is associated with an input confidence value (ck), wherein the filter output (out) depends on the input samples, the input confidence values as well as the filter coefficients. The filter contains multiple accumulators (acc01, acc02, acc03, acc04), wherein an output sample is produced after a predetermined number of sample values with associated confidence values have been input to the filter.
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