Abstract:

In order to store the date, time and place of a wrecked ship at sea on time, a dual-mode navigation module based video character overlay system was presented. It introduces the structural characteristics of the TD3020C module of dual-mode navigation and the chip MAX7456 of character overlay, and then the methods of hardware circuit design and software design are given in the video character overlay system. According to the experiment result, the system can be very good to dual-mode navigation module returns the date, time, longitude, latitude information overlay on the input PAL （Phase Alteration Line）analog video.

Key words: video character overlay, MAX7456 chip, dual-mode navigation module, circuit design, software design