A distinguishing feature of the system is that it is not based on special video overlap chip that is common in this field, but USES DSP and CPLD to finish overlap functions.
系统主要特点是并非基于通常所采用的专用的视频叠加芯片，而是通过DSP和CPLD来实现视频叠加的功能。
A distinguishing feature of the system is that it is not based on special video overlap chip that is common in this field, but USES DSP and CPLD to finish overlap functions.
系统主要特点是并非基于通常所采用的专用的视频叠加芯片，而是通过DSP和CPLD来实现视频叠加的功能。
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