Cable modem optimized for high-speed data transmission from the

Details Cable modem optimized for high-speed data transmission from the Cable modem optimized for high-speed data transmission from the

1997-12-15

1999-11-16

Faile, Andrew I.

Television

Two-way video and voice communication

User positioning

348 13, 348476, 348723, 455 51, H04N 710

Patent

active

059866918

ABSTRACT:
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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