Title:
【発明の名称】ビデオ信号処理装置
Document Type and Number:
Japanese Patent JP3289107
Kind Code:
B2
Abstract:
An auxiliary video information decoder for extracting an auxiliary video information signal from a video signal includes a data slicer (230) and apparatus (220) for adjusting the slicing level of the data slicer (230). The slicing level is adjusted rapidly until a reference component of the auxiliary information signal is detected during a display interval of the video signal in which auxiliary video information is expected to occur. A count is incremented after display intervals in which the reference component is detected and is decremented after display intervals in which the reference component is not detected. Slicing level adjustment ceases while the count is at least a predetermined number. The apparatus rapidly adapts the slicing level to long-term video signal amplitude changes of significant magnitude (e.g. following a channel change) and maintains a constant slicing level when transient variations occur in the video signal amplitude.
Inventors:
Tarts, lily
Application Number:
JP50807294A
Publication Date:
June 04, 2002
Filing Date:
July 29, 1993
Export Citation:
Assignee:
Thomson Consumer Electronics Incorporated
International Classes:
H04N7/025; H04N7/03; H04N7/083; H04N7/035; H04N7/087; H04N7/088; H04N5/18; (IPC1-7): H04N7/025; H04N7/03; H04N7/035
Domestic Patent References:
| JP58105677A |
Attorney, Agent or Firm:
Katsunori Watanabe