为了建立节能控制系统，本文首先分析了几种常见的住宅内的网络结构，从中选用了以电力线为通信介质的通讯网络，并介绍了一种基于DTMF编码方式的电力线通信系统。

To establish a house saving energy system, this text first analyses several net structures, and chooses power line as the correspondence medium, and also USES DTMF coding mode.

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在这种模式中，上方像素块中的八个底部像素被沿对角线方向拷贝至经过帧内编码的宏块中。

In this mode, eight bottom pixels from the blocks above are copied diagonally into part of an intra-coded macroblock.

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