System for data channel level control

• Main Authors: CHARLES ROBERT BRAMHALL, DAVID JONATHAN NADDOR, GREGORY STEVEN DURDEN, LAMAR EDWIN WEST JR, DONALD RANDOLPH HUNTLEY, RAY THOMAS HAMAN JR, ROBERT JOHN BEYERS II, RANDOLPH JAMES SCHAUBS, ROBERT JAY EDWARDS, EMORY L. MCGINTY JR, JOHN ANSON KENNEDY, ANTHONY JOHN WASILEWSKI, JAY CAUTHERN MCMULLAN JR, JESSE MONROE STILL, DONOVAN STEVE WHITE, DOUGLAS JOHN HODER
• Format: Patent
• Language: English
• Published: 14.10.1993
• Edition: 5
• Subjects: BROADCAST COMMUNICATION; CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

Automatic level calibration apparatus for transmitting data from a cable television terminal to the headend of a cable television system comprises programmable transmitter apparatus of the terminal, programmable receiving apparatus at the headend and a calibration controller. Responsive to an addressed command from the headend, the programmable transmitter apparatus returns a sequence of levels at a particular calibration frequency. The programmable receiver apparatus determines an indication of the received signal strength of each of the levels of the sequence of levels. The controller determines an optimum level for transmissions from the terminal.