| 摘要 |
<p>A communication system comprises a digital data source including a digital VSB remodulator, such as a VCR, and a downstream digital VSB device, such as a television. The digital VSB remodulator remodulates digital data from the data source received on one of a plurality of channels to digital VSB data on a downstream channel and transmits the digital VSB data to the downstream digital VSB device in the downstream channel at a symbol rate fs. The downstream digital VSB device transmits information, such as its identification, to the digital VSB remodulator in an upstream channel corresponding to a carrier frequency (NM)fs. The plurality of channels and the downstream channel occupy a bandwidth above about 50 MHZ, and (NM)fs is below this bandwidth.</p> |
