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Patent Searching and Data


Title:
HIGH SPEED BIDIRECTIONAL DIGITAL CABLE TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/1995/027352
Kind Code:
A1
Abstract:
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.

Inventors:
PAFF THOMAS MICHAEL
GRAHAM HATCH
Application Number:
PCT/US1995/003238
Publication Date:
October 12, 1995
Filing Date:
March 14, 1995
Export Citation:
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Assignee:
STANFORD TELECOMM INC (US)
International Classes:
H04J3/00; H04J4/00; H04L7/04; H04L12/28; H04L27/00; H04N7/10; H04N7/173; H04N21/2383; H04N21/438; (IPC1-7): H04J4/00
Foreign References:
US4498169A1985-02-05
US5272700A1993-12-21
US5084903A1992-01-28
Other References:
See also references of EP 0754378A4
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