Apparatus and methods for avoiding loss of closed caption data w

Details Apparatus and methods for avoiding loss of closed caption data w Apparatus and methods for avoiding loss of closed caption data w

1994-06-24

1996-08-06

Kostak, Victor R.

Television

Format

Including additional information

H04N 7088

Patent

active

055438520

ABSTRACT:
Apparatus and methods are provided for inserting data into a vertical blanking interval (VBI) line of video frames. The method includes the steps of inserting first data into a first vertical blanking interval VBI line for a plurality of consecutive video frames, inserting second data into a second vertical blanking interval VBI line for a plurality of consecutive video frames, counting a number of consecutive video frames having first data inserted into the first vertical blanking interval VBI line, terminating the insertion of first data for a first number of video frames before again inserting first data into the first vertical blanking VBI interval line when the counted number of consecutive video frames into which first data is inserted into the first vertical blanking interval VBI line equals a second number, and repeating the steps. In a specific embodiment the method includes the steps of detecting when the insertion of second data into the second vertical blanking interval VBI line terminates, and terminating for a second number of video frames the insertion of first data into the first vertical blanking interval VBI line upon detecting the termination of insertion of the second data into the second vertical blanking interval VBI line. Another method for inserting data into VBI lines includes the steps of testing whether data is being inserted into a first VBI line, and inserting any data into VBI lines adjacent to the first VBI line in 2X format rather than 1X format, if data is being inserted into the first VBI line.

REFERENCES:
patent: 4855827 (1989-08-01), Best
patent: 5237412 (1993-08-01), Nakajima
patent: 5347318 (1994-09-01), Kobayashi
patent: 5371545 (1994-12-01), Tults

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