摘要
提出用梯形积分公式和抛物线型积分公式代替FFT中的矩形积分公式,以提高FFT精度。比较了矩形法、梯形法和抛物线法的截断误差,误差估计式表明,抛物线法的精度远远高于矩形法和梯形法,可达ΔT4阶。用单频信号检验了这3种方法的精度。
In order to improve the precision of FFT, the scheme of trapezoid and Simpson's rule are substituted for normal rectangular integration in FFT. The trunca-tion errors show that the Simpson's rule is far more precise than the other 2 methods.The truncated error of a single frequency signal for 3 methods are also derived.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1996年第6期74-79,共6页
Journal of China Agricultural University
基金
国家自然科学基金
关键词
FFT
数值积分
信号处理
numerical integration
FFT
signal processing