摘要
为了实现不同格式纵向时间码(LTC)的时间信号的提取,提出了一种基于FPGA的自适应方法。根据纵向时间码的格式以及频率,计算出时间码波形中电平0或者1的典型宽度,经过比较电路将波形转换为相对应的0、1信号。时间提取电路将转换后的编码中的时间信号提取出来,以串行通信的数据格式压缩,发送给上位机,以便准确的控制视频信号。最后通过Max+plusII对提出的模型进行仿真,结果显示本文的方法可以准确的实现纵向时间编码的采集和解码。
In order to extract time signal of different formats of I.ongitudinal Time Code （LTC）, this paper introduces a self-adaptive method realized on FPGA. The method could calculate the typical width of high level 1 or low level 0 in time code wave form according to the format and frequency of I.TC. Through eomparator circuit, the wave form is transformed into corresponding digital 0 and 1 signal. Time information from the mentioned digital signal is extracted by the time extracting circuit. Then it is packaged by UART format conversion and sent to computer by UART. Time information is used for controlling video signal accurately. The experiment shows that this method could obtain satisfied result.
出处
《电子测量技术》
2013年第12期60-63,共4页
Electronic Measurement Technology
