摘要
通道间信号传输延迟时间是多通道高速数字采集系统的一项重要评价指标.本文应用Hilbert-Huang变换对采集到的单频正弦信号进行数字信号滤波处理,对滤波后的数据进行Hilbert变换得到信号的瞬时相位,可以精确识别信号源的频率,并能够方便地得到通道间信号传输延迟时间.为高速数字采集系统通道间信号传输延迟时间分析提供了一种行之有效的分析处理方法.
The time of signal transmission delay among different channels is an important evaluation indicator of multi-channel high-speed data acquisition system. This paper presents the Hilbert-Huang transform to process the acquired single-frequency sinusoidal signal by digital signal filtering, the instantaneous phase of the filtered data is obtained through Hilbert transform, and then we can gain the correct frequency information of signal source and the signal transmission delay among different channels. Experiments show that the method is an effective way to evaluate signal transmission delay for multi - channel high-speed data acquisition systems.
出处
《测试技术学报》
2011年第2期178-182,共5页
Journal of Test and Measurement Technology
关键词
希尔伯特黄变换
高速数字采集
传输延迟
hilbert-huang transform
high-speed data acquisition
signal transmission delay
