HIGH SPEED BIDIRECTIONAL DIGITAL CABLE TRANSMISSION SYSTEM

摘要

A high speed bidirectional cable transmission system for CATV and other television systems includes unidirectional transmission of video signals from a head end unit (10) to a plurality of transceivers or subscribers connected to a transmission line. The head end unit (10) encodes voice data using QPSK encoding and time division multiplexing of the encoded data in a plurality of frequency bands to the subscribers. Each subscriber attached to the cable (32) for receiving continuous transmission of voice and video data is assigned an identification number and at least one voice channel for selectively accessing data. Each subscriber includes a transmitter for transmitting voice data on the cable (32) to the head end unit (10) using time division multiple access transmission of bursts of data in the plurality of frequency bands.