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,比较了矩表法,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ΔT^4阶。用单频信号检验了这3种方法的精度。 |
关键词: FFT 数值积分 信号处理 |
DOI: |
|
基金项目:国家自然科学基金 |
|
Comparison on 2 Algorithms for Improving FFT Precision |
|
|
Abstract: |
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. |
Key words: numerical integration,FFT,signal processing, |