The butterfly arithmetic structures of three kinds of Cooley-Tukey radix-4 FFT algorithm and the simple calculation formulas for their common factors ( p ) of twiddle factor indexes are derived.是什么意思_The butterfly arithmetic structures of three kinds of Cooley-Tukey radix-4 FFT algorithm and the simple calculation formulas for their common factors ( p ) of twiddle factor indexes are derived.在线翻译_英语_读音_用法_例句