视频字符的显示原理是将字符点阵信号与原始视频信号叠加。
The principle of displaying a video character is that a character dot matrix signal is superimposed upon an original video signal.
由于原始视频信号数据量巨大，必须经过压缩才能在无线网络中传输。
Original video data must be compressed for transmission in wireless network because of its high bandwidth.
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