由于数字化后的视频信息非常庞大，在视频信息传输时首先会经过压缩，使得视频信息能够占有最小的带宽。
Because the digitized video information is extremely huge, it will be compressed first to hold the minimum bandwidth, when video information transmit.
利用降低码片速率有效降低每路信号占有的带宽，将每路信息的比特分配在不同的调制载波上，减少了各路信号间的多址干扰。
Frequency width is compressed by decreasing signature-code speed and using bit-signal modulates by different carrier so as to decrease multi-user interference.
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