note

Butterworth Filterのパーフェクトオーダーツールを作ってみた

Butterworth Filter（バターワース・フィルター）のパーフェクトオーダーを作りました。 Super Smootherもそうですが、実用性を考えてロジックを代替えするのもありですが、忠実に作成するのは割と大変だったりします。 概要 Butterworth Filter（バターワース ...
note

Gaussian Filterのパーフェクトオーダーを作ってみた

ガウシアンフィルター（Gaussian Filter）のパーフェクトオーダーでサインが出るツールを作ってみました。 統計学で用いられるガウス関数（正規分布）を応用した平滑化（スムージング）フィルターであり、主に価格のノイズを除去し、市場の真のトレンドを ...
EDN

Design second- and third-order Sallen-Key filters with one op amp

RP Sallen and EL Key of the Massachusetts Institute of Technology’s Lincoln Laboratory in 1955 introduced the Sallen-Key analog filter topology. Engineering literature extensively discusses the second ...
IEEE

Multiway Bandpass Power Divider Design With Flexible Filter Order

Abstract: This paper proposes an innovative design method for multiway filtering power dividers (PDs) that is both simple and allows for the filter order to be flexibly adjusted, effectively ...
EDN

On the Design of Higher-order Shelf Filters ” Part 1 of 3

Perhaps the finest paper written on filter design is Moorer's cleverly-titled opus, “The Manifold Joys of Conformal Mapping.” While primarily an invaluable study of the methods of transforming ...
IEEE

Optimized Trade-Offs and Flexibility in Microwave Filters: Leveraging Fractional Order Design

Abstract: This letter presents a synthesis method for fractional-order filters, which transforms the conventional discrete filter order into a continuous number. The method introduces an additional ...
Electronic Design

Simple First Order Digital Filter Design

Introduction It is often necessary to filter data from sensors or audio streams in order to suppress unwanted noise. And, most of the time, a simple first order filter is all that is required. The ...