The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1999
Filed:
Jan. 13, 1997
Walter Y Chen, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A cable television system employs noise cancellation in order to reduce radio frequency noise for upstream signals. The noise cancellation can be located at the headend or located at the juncture between the cable distribution system and the subscriber distribution system. The system employing noise cancellation at the headend has an antenna at a central distribution point on the cable system, such as a fiber node. The system employing noise cancellation at the juncture between the cable distribution system and the subscriber distribution system employs a local antenna. The noise received by the antenna is correlated with noise on the line in an adaptive filter for cancelling or reducing the noise on the line.