传统的字符叠加都是使用专用的OSD芯片,一般价格较高,故障率也较高,而且通常只能实现英文字母和数字的叠加。选用的一种新的字符叠加方案是基于TI的2000系列DSP的,通过调试验证效果良好,且实现了汉字及图形的叠加,并减小了故障率,降低了系统成本。 Traditional character overlay is to use a dedicated OSD chip, the general price is higher, the failure rate is higher, and usually only achieve the English letters and numbers superimposed. A new character overlay scheme is based on TI’s 2000 series of DSPs. The debugging and validation results are good, and the superposition of Chinese characters and graphics is realized, the failure rate is reduced, and the system cost is reduced.