| 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, |
