Television – Nonpictorial data packet in television format – Data separation or detection
Reexamination Certificate
1999-05-21
2002-06-04
Miller, John W. (Department: 2614)
Television
Nonpictorial data packet in television format
Data separation or detection
C348S478000, C348S901000, C348S705000, C348S473000, C348S468000, C725S039000, C725S137000, C725S020000, C386S349000
Reexamination Certificate
active
06400408
ABSTRACT:
The invention relates to a television signal processing device for autonomously determining television program information, having receiving means for receiving a television signal in a receiving channel receivable by the receiving means and for receiving an information signal which comprises data blocks containing data block information and which is receivable recurrently in blanking intervals of the television signal, and having an information detection stage for detecting data block information identified by a given data block address in each receiving cycle of the received information signal, and having television program information determining means for determining television program information contained in data block information detected by means of the information detection stage and for presetting at least one further data block address for the information detection stage in order to determine further television program information contained in the information signal, and having a switching stage for autonomously switching over the receiving means for the reception of at least one further television signal comprising an information signal in blanking intervals via at least one further receiving channel so as to enable further television program information to be determined autonomously.
Such a television signal processing device of the type defined in the opening paragraph, included in a television set, is known from the document is known from the document EP 0 337 336 A2. The known television set has receiving means with which it is possible to receive a television signal from a television station as for example ARD, ZDF or CNN in a receiving channel. A received television signal can be displayed as a television program on a viewing screen of the television set.
The receiving means are further adapted to receive an information signal transmitted in blanking intervals of a television signal. The information signal conveys digital data including VPS information (Video Program System; European Telecom Standard ETS 300 231) and teletext information. Each television program received as a television signal is identified by given VPS information. VPS information also includes television signal identification information which identifies a television signal and by means of which the television station which makes a television signal available and which transmits this signal can be identified. Teletext information of a television signal may include television program information about television programs of one or more receiving channels which can be received, for example, within the next week. Television program information can be formed by digital data representative of television signal identification information, the date, the starting and ending time, the title as well as the VPS information of a television program.
Teletext information can be received as data block information in data blocks formed by teletext pages, in successive receiving cycles of equal contents which recur approximately every 30 to 60 seconds. The known television set has an information detection stage formed by a teletext microprocessor which can be preset to a teletext page formed by a data block address. and which is adapted to detect the teletext page identified by the teletext page number and contained in the teletext information.
The known television set further comprises television program information determining means for determining and storing television program information contained in teletext information contained in the television signals which can be received by the receiving means. For this purpose, the television program information determining means use a television program information determining algorithm with which television program information is determined by presetting teletext page numbers for the teletext microprocessor and by evaluating the teletext information detected by the teletext microprocessor for a received television signal and said television program information is stored in a television program memory. In accordance with the television program information determining algorithm, after television program information has been derived from the teletext information of a television signal, the receiving means can be switched over independently by a switching stage in order to receive a further receivable television signal which transmits teletext information in the blanking intervals of the television signal in order to derive television program information from the teletext information of this television signal and store this in the television program memory. The receiving means can be switched over so often by the switching stage in order to receive a further television signal that television program information from all the information signals of receivable television stations is received and is stored in the television program memory. In the known television set the television program information determining algorithm is carried out fully autonomously and automatically once a day, for example in the morning because time television sets are generally not used at this time.
During the execution of the television program information determining algorithm the known television set is adapted to detect teletext page numbers which refer to teletext pages from which television program information can be derived. For this purpose, the television program information determining means are adapted to compare VPS information currently received by the receiving means with teletext information received during a receiving cycle. When the received VPS information is found in the received teletext information a teletext page number can be detected which identifies the teletext page containing this VPS information. The detected teletext page number can be applied to the information detection stage by the television program information determining means in order to detect teletext information identified by the teletext page number during the next receiving cycle. Further television program information can be derived from teletext pages bearing increasing teletext page numbers.
By the actuation of a key of the remote control device of the known television set the television set can display a list of receiving suggestions which is derived from the television program information stored in the television program memory and which contains the titles and starting times of television programs and television signal identification information of the television stations from which these television programs can be received currently or shortly.
However, with the known television set it has been found that the detection of teletext page numbers which identify teletext page numbers from which television program information can be derived cannot be effected reliably because temporarily VPS information, which serves to identify a currently receivable television program, is not presented and transmitted correctly by the television stations or because television program information contained in a teletext page temporarily contains incorrect VPS information about a television program. Moreover, VPS information may have been presented and transmitted correctly by a television station or may appear correctly in the television program information but may not be received correctly as a result of a comparatively poor reception quality of the received television signal. In both cases the television program information determining means cannot detect agreement between VPS information received by the receiving means and VPS information contained in the teletext information received during a receiving cycle. As a consequence, no television program information can be derived from a television signal from such a television station in such cases, as a result of which a list of receiving suggestions generated by means of the detected television program information is incomplete.
Furthermore, the television program information determining algorithm of the known television set requires relatively much time to det
Desir Jean W.
Goodman Edward W.
Koninklijke Philips Electronics , N.V.
Miller John W.
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