Omnibus closed captioning decoder for encoded video

Television – Nonpictorial data packet in television format – Data separation or detection

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H04N 708

Patent

active

060974397

ABSTRACT:
A method is provided for parsing closed captioning data (or other types of like embedded data, such as extended service data) encoded according to one of at least three syntaxes. An encoded video signal is received which is hierarchically organized into picture sections of a picture layer. Each picture section contains an encoded picture and at least one corresponding user data section. A beginning of a sequence of bits of the user data section is identified within one of the picture sections. If the identified sequence of bits contains either undefined data or closed captioning data encoded according to either a specific first syntax or closed captioning data encoded according to a specific second syntax, but not closed captioning data encoded according to any other syntax, then the following steps are performed. A byte is extracted from a beginning of the sequence representing a user data length. A byte is also extracted following the user data length byte in the sequence, which represents a user data type. A determination is made whether or not the user data length byte equals a first predefined constant or a second predefined constant, indicating the presence of two closed captioning bytes according to the first and second syntaxes, respectively. If so, then a determination is made as to whether or not the user data type byte equals a third predefined constant. If both these determinations are made in the affirmative, then immediately following the user data type byte in the sequence, two closed captioning bytes are extracted for the corresponding picture. An apparatus for performing the method is also disclosed.

REFERENCES:
patent: 5574505 (1996-11-01), Lyons et al.
patent: 5699124 (1997-12-01), Nuber et al.
patent: 5745184 (1998-04-01), Neal
patent: 5883675 (1999-03-01), Herz et al.

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