摘要： 由于有限字长的限制，使得工程应用中16点快速傅里叶变换(FFT)的结果中含有截尾噪声。在许多应用场合，该截尾噪声对系统性能具有一定的影响。为了能定量描述这种噪声，该文分析了16点FFT处理中信号与噪声的传递特性，得出了FFT输出的信噪比(SNR)。

关键词: 快速傅里叶变换, 16点, 有限字长, 信噪比

Abstract: Systemic output contains truncating noise after 16-point FFT because of finite word-length approximation to figure. Under many situations, this noise will influence systemic performance. In order to quantitate the noise, this paper analyzes transmitting character of signal and noise in FFT, and obtains SNR of systemic output.

中图分类号: 

• TN911.72