Conditional access system of CATV
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 22, 2005
Grant Date -
N/A
app pub date -
Apr 10, 2000
filing date -
Apr 9, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A CATV conditional access system equipped with a digital head end which transmits picture signals of digital programs in a batch mode to terminals provided within a plurality of areas. This digital head end transmits area codes for the respective areas and data about a list table to the terminals employed in the plural areas. In this list table, digital programs of not-yet-provided services for the respective areas are indicated. The area codes are used to recognize such areas belonging to the own terminals. Each of the terminals excludes the picture signal of the digital program of the not-yet-provided service in the related area by identifying the area code with the list table of the not-yet-service digital channel.
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