首先，它有两种模式(即可以由编码器选择)：快速模式和普通模式。

First, it has two modes (which can be chosen by the encoder) : a fast mode and a normal mode.

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“自上而下”和“自下而上”宏块划分模式选择算法首先作为编码器的快速算法被提出。

The top-down and bottom-up mode selection schemes were first introduced as fast mode decision algorithms for video encoders.

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由于未传输视频数据时视频编码器呈 节电模式，因此可达到省电的功效。

Since the video coder is at energy-saving mode when not transmits video data, the invention can save energy.

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