一部のエンジン制御システムには､以下のフリー/オープンソース ソフトウェア（FOSS）を使用しています。
============================================================================
fft_f2c.c
http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
http://www.kurims.kyoto-u.ac.jp/~ooura/fft-j.html
Copyright Takuya OOURA, 1996-2001
You may use, copy, modify and distribute this code for any purpose(include commercial use) and without fee. Please refer to this package when you modify this code.
Please note;- Modifications have been made to original source files
=============================================================================
