When a composite video signal is broadcast over the airwaves by a TV station, it happens on a specific frequency.

当电视台要把组合视频信号经由无线电波广播出去时，要先把它调制到特定频率的载波上。

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This video frequency document greatly please manual closure space music as well as your computer some do not use the application procedure guaranteed that the broadcast seeing and hearing is smooth.

该视频文件较大请手动关闭空间音乐以及你的电脑一些不用的应用程序以确保播放视听流畅。

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