基于正极性电视信号的场消隐期数据传输

Data transmission of vertical blanking intervals based on positive TV signal

现有的场消隐期数据传输电路采用专用的行、场分离电路,但应用于数据传输量较少的监控系统成本偏高。提出一种基于正极性电视信号的场同步监测电路,采用一个双极性三极管和两级积分电路代替专用的行、场分离电路。其100μs的高电平加10μs低电平的同步头确保接收端准确的同步。采用奇偶校验法实现数据信号传输的完整性和稳定性。应用于某视频监测系统,已取得了良好效果。

The existing VBI data transmission circuit mostly used special integrated circuit to detect composite synchronization, and it cost too much for some television monitoring systerms which transfered less data. This paper used crystal triode and integrating circuit instead of special integrated circuit to detect vertical synchronization signal. Then designed synchronization header which consisted of about 100μs high level and exact 10ws low level. Parity check was used to ensure the completion and stability of data transmission. This data transmission is applied to television monnitoring system,and makes a good effect.