发明名称 |
Cable modem optimized for high-speed data transmission from the home to the cable head |
摘要 |
A cable modem provides upstream data signals in a cable system on a return channel. The upstream data signals are provided in a 50-550 MHz frequency range and yet do not affect the picture quality associated with conventional cable television signals. The data is provided on vestigial sidebands associated with the cable television signals or during black periods associated with the cable television signals. The data can be modulated in accordance with quadrature amplitude modulation (QAM) techniques.
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申请公布号 |
US5986691(A) |
申请公布日期 |
1999.11.16 |
申请号 |
US19970990279 |
申请日期 |
1997.12.15 |
申请人 |
ROCKWELL SEMICONDUCTOR SYSTEMS, INC. |
发明人 |
HENDERSON, P. MICHAEL |
分类号 |
H04Q11/04;(IPC1-7):H04N7/10 |
主分类号 |
H04Q11/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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