Use the Frequency Spectrum (FFT) display to measure the approximate value of the fundamental frequency of the wire on the Sonometer.

使用频谱（FFT）显示测量振动频率计上金属丝基频的近似值。

A new type of digital phasometer applied to the infrared laser position-tracking system of mine hoister is introduced in the paper,which is based on FPGA and FFT algorithm.

主要介绍了提升机红外激光位置跟踪系统中种新型数字鉴相器的研究法,该法基于FPGA器件运用FFT算法完成的。