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逐次係数設定方式のFIR逆フィルタ回路

逐次係数設定方式のFIR逆フィルタ回路

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カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2014/03/01

タイトル(英語): Serial Processing FIR Inverse Filter Circuit

著者名: 高遠 健司(富士通テレコムネットワークス(株))

著者名(英語): Kenji Takato (Fujitsu Telecom Networks Ltd)

キーワード: 逆フィルタ,周波数特性,FIRフィルタ,逐次計算,インパルス応答,VHDL  inverse filter,frequency response,FIR filter,serial calculation,impulse response,VHDL

要約(英語): Inverse filter is used in many fields such as audio circuit, telecom line equalization both metal and optical, and wireless equalization. The purpose of the filter is to compensate the distortion of the signal caused by the transmission media. Design methods of inverse filter using IIR filter, using FFT/IFFT and adaptive FIR filter are available. However IIR filter has some problem of stability, FFT/IFFT method needs a lot of calculation and adaptive FIR filter needs a lot of time. This paper proposes a new method to generate FIR inverse filter coefficients by serial calculation of impulse response and it's expecting value. At first all coefficients of FIR filter except the first one are zero. If the input of impulse response data XN is applied to the filter, the temporal output of the FIR filter WN is compared to the expectation value EN, each FIR inverse filter coefficient gN is calculated by gN=(EN-WN)/X0 step by step. This algorism is simulated by Excel calculation. The FPGA base circuit is synthesized by VHDL and behavior model is also simulated by ISE design tool. The coefficients of the filter is generated during the input period of data XN, therefore real-time inverse filter circuit generation is available.

本誌: 電気学会論文誌C(電子・情報・システム部門誌) Vol.134 No.3 (2014) 特集:情報環境と人間の調和に向けた工学技術

本誌掲載ページ: 362-368 p

原稿種別: 論文/日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/134/3/134_362/_article/-char/ja/

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