PROBLEM TO BE SOLVED: To address the difficulty for improving accuracy of a filter, while suppressing a delay time.SOLUTION: A waveform filter device includes: an FIR(Finite Impulse Response) filter that processes an input original signal to output a first signal delay output means that outputs a second signal formed by delaying the original signal by a same time as a delay amount of the FIR filter and a central value output means that compares the first signal, the second signal, and a third signal having a prescribed fixed value and outputs a second-largest value among them.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】遅延時間を抑えつつフィルタの精度を向上させることが難しい。【解決手段】波形フィルタ装置を、入力された原信号を処理して第一の信号を出力するFIR(Finite Impulse Response)フィルタと、原信号をFIRフィルタの遅延量と同じ時間遅延させた第二の信号を出力する遅延出力手段と、第一の信号、第二の信号及び所定の固定値を持つ第三の信号の電位を比較し、その中で2番目に大きい値を出力する中央値出力手段とを備える構成とする。【選択図】図1
