EP0406972A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Teletext decoder and receiver for television signals for receiving cyclically transmitted teletext pages
Assignee: Koninklijke Philips NV
•
Filing: 1990-07-02
•
Granted: —
•
Expires: 2010-07-02
Abstract
Abstract Teletext decoder comprising a decoding circuit (45) and a memory medium (46) in which a reception indication is stored for the transmitted pages so as to indicate whether a requested page is present or not present in a transmitted cycle. The teletext decoder is adapted to determine the duration of the cycle at which the teletext pages are transmitted. It is also possible to determine the waiting time for a requested teletext page and to display it on the display screen of a television receiver via a character generator (47). The user is also informed of the occurrence of rotating pages and the reading time of such pages is displayed. The convenience of use of a television receiver with such a teletext decoder is thereby improved considerably.
Inventors
- 👤 Petrus Joseph Franciscus Johannes Van Den Hombergh
- 👤 Jelle Polstra
- 👤 Rony Marc Michel Schurmans
- 👤 Adrianus Christiaan Tegenbosch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 16:37
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/087; H04N7/088; H04N7/0882
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A teletext decoder for receiving cyclically transmitted teletext pages, comprising a decoding circuit for determining page numbers of teletext pages present in a transmitted cycle and a memory medium for storing a reception indication for the transmitted teletext pages, indicating the presence of the pages in the transmitted cycle, characterized in that the decoding circuit is further adapted to determine and store the cycle period at which the pages are transmitted.
Claim 2
Dependent Claim
71 words
A teletext decoder for receiving cyclically transmitted teletext pages, comprising a decoding circuit for determining page numbers of teletext pages present in a transmitted cycle and a memory medium for storing a reception indication for the transmitted teletext pages, indicating the presence of the pages in the transmitted cycle, characterized in that the decoding circuit is further adapted to determine and store the cycle period at which the pages are transmitted.
Claim 3
Dependent Claim
46 words
A teletext decoder as claimed in Claim 1, characterized in that the decoding circuit for determining the cycle period is adapted to raise a cycle period count during a predetermined period in response to the reception of a page whose reception indication is not stored yet.
Claim 4
Dependent Claim
53 words
A teletext decoder as claimed in Claim 1 or 2, characterized in that in the case of reception of a teletext page the decoding circuit is further adapted to store a further memory value for said page in the memory medium, which value is related to the instant when the page is transmitted.
Claim 5
Dependent Claim
42 words
A teletext decoder as claimed in Claim 3, characterized in that the decoding circuit is adapted to determine for each teletext page the individual cycle period between successive receptions of the page and to store said period as a further memory value.
Claim 6
Dependent Claim
49 words
A teletext decoder as claimed in Claim 4, characterized in that the individual cycle period between successive receptions of a teletext page is determined and stored for the teletext pages which are provided with an indication that the corresponding page number is outside the used numerical sequence of transmission.
Claim 7
Dependent Claim
61 words
A teletext decoder as claimed in Claim 3, 4 or 5, characterized in that the decoding circuit is further adapted to remove the corresponding reception indication from the memory medium in response to the fact that a teletext page is no longer received during a predetermined period which is related to the cycle period after the most recent instant of reception.
Claim 8
Dependent Claim
58 words
A teletext decoder as claimed in any one of the preceding Claims in which the decoding circuit is adapted to determine and store subpage numbers of rotating teletext pages having equal page numbers, characterized in that the decoding circuit is further adapted to determine and store the highest and the lowest subpage number as a further memory value.
Claim 9
Dependent Claim
43 words
A teletext decoder as claimed in any one of the preceding Claims, characterized in that the memory medium for storing reception indications and said further memory values comprises for each receivable page number a memory location which is addressable by the page number.
Claim 10
Dependent Claim
85 words
A receiver for television and teletext signals, comprising tuning and demodulation means for obtaining a selected television and teletext signal, a teletext decoder receiving the teletext signal for receiving cyclically transmitted teletext pages, a character generator for generating a character signal, a display screen for displaying the television signal and the character signal, and a control circuit which is coupled to the teletext decoder and the character generator, characterized in that the teletext decoder is implemented as claimed in any one of the preceding Claims.
Claim 11
Dependent Claim
63 words
A receiver for television and teletext signals as claimed in Claim 9, characterized in that the teletext decoder is implemented as claimed in any one of Claims 3 to 8, and in that the control circuit is adapted to determine the waiting time until reception of the desired page and to display it on the display screen when a teletext page is requested.
Claim 12
Dependent Claim
61 words
A receiver for television and teletext signals as claimed in Claim 9 or 10, characterized in that the teletext decoder is implemented as claimed in Claim 7 and in that the control circuit is adapted to determine the reading time until reception of the next subpage and to display it on the display screen when a rotating teletext page is displayed.
Claim 13
Dependent Claim
60 words
A receiver for television and teletext signals as claimed in Claim 9, 10 or 11, characterized in that the teletext decoder is implemented as claimed in Claim 7 and in that the control circuit is adapted to determine the waiting time until reception of the selected subpage and to display it on the display screen when a subpage is selected.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.