Polarity of the video signal is designed to minimize the amount of power used to transmit sync.
Polarity of the video signal is designed to minimize the amount of power used to transmit sync.
同时，我们在地面广播中到目前也没有传送高清电视信号的版本。
Polarity of the video signal is designed to minimize the amount of power used to transmit sync.
同时，我们在地面广播中到目前也没有传送高清电视信号的版本。