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:
Apr. 17, 2012
Filed:
Nov. 23, 2009
Todd W. Jones, Kansas City, MO (US);
Douglas Medina, Grain Valley, MO (US);
Frank Mitchals, Willard, MO (US);
Todd W. Jones, Kansas City, MO (US);
Douglas Medina, Grain Valley, MO (US);
Frank Mitchals, Willard, MO (US);
AT&T Intellectual Property I, LP, Atlanta, GA (US);
Abstract
A closed caption detection system includes a video line selector that outputs a selected line of a video signal, a luminance detector that outputs a luminance level of the selected line, and an alarm that compares the luminance level with a threshold level and provides an alarm based on the result. A method of detecting closed captioning data includes selecting a television channel, decoding closed captioning in the channel, detecting a luminance level of a closed captioning line of the television signal, comparing the luminance level with a threshold level, waiting for a time if luminance level of the selected line is less than the threshold luminance level, and then re-detecting luminance level and re-comparing the luminance levels, then, if the luminance level is less than the threshold level, indicating the absence of closed captioning data.