1个月后，北京奥运即将来临，奥运会将采用高清直播，对消费者来讲，这正是一次体验高清震撼的机会。今年以来，各彩电厂家争相推出自己的数字电视一体机产品，这个新事物有多大的能耐，非得体验一下才知道。
满足三点 高清入眼
高清的概念已被热炒很久，但在普通消费者家中，高清电视的普及率很低。换句话说，即便你的数字电视信号提供高清内容，但受限于接收终端，你也可能看不到高清的效果。
想看高清内容必须满足三个条件。首先，内容源必须是高清的，即通过高清设备拍摄和录制的；其次，收看高清视频的设备必须是高清的，例如数字电视一体机；再次，传输高清视频的通路也必须足够大，因为支持高清视频需要4至5倍于标清内容所需带宽的“通道”。简言之，从内容、到传输、到呈现，全程都必须是“高清”的。
高清奥运 全程免费
通过地面数字信号，北京现在可以免费看到央视提供的两套高清和六套标清频道，其中包括CCTV-高清、CCTV-音乐等。北京奥运会期间，央视高清综合频道将全程转播北京奥运会开闭幕式和各项奥运赛事。
不过，由于目前地面数字信号还不够稳定，市区内可能接收效果还比较好，但稍远一些的地方就必须加一个小型天线。
国家正在大力推动电视产业的模拟向数字化的转换，且地面数字电视具有公益性质，因此奥运后很长一段时间内，所有高清及标清电视内容仍然全部免费。而今后是否收费，现在还不清楚。
高清标清 一键切换
高清终端的选择有很多，目前最主流的是将高清机顶盒内置于电视的数字电视一体机。目前，国内厂商推出的数字电视一体机采用的都是凌讯科技的“二合一”芯片，而卖场的展示机型大多播放的是高清版的《故宫》以及《大宅门》。
通过数字电视一体机，高清和标清频道的切换就如同电视节目与DVD互相间的切换一样，遥控器上有一个专门的切换键，可以实现高清和标清频道的一键切换。上周，康佳的数字电视一体机在北京等8大城市开卖。（田丛）
【编
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