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Patent EP0567168A2 successfully refreshed from Google Patents.
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EP0567168A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Data decoder

Assignee: Philips Electronics UK Ltd
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Filing: 1993-03-19
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Granted: —
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Expires: 2013-03-19
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Abstract

Abstract A data decoder, for example for decoding teletext and VPS data, comprises an input signal clamp and synchronising signal separate circuit (2) which receives a combined video and blanking signal and produces synchronising pulses for a timing circuit (4) and video signals applied to an ADC 6 and a data slicer and clock generator (7). Sliced data and clock signals feed an acquisition circuit (8) which acquires selected data which is stored in a memory (10). A control circuit 11 is arranged to modify the DSCR (7), acquisition circuit (8) and memory interface (9) in dependence on the type of data detected. The arrangement is such that the detector is set to decode data of one type, for example teletext, and if no valid data is detected within a given period, for example four television frames, the control circuit (11) causes the decoder to attempt to decode data of the other type (VPS).

Inventors

  • 👤 Shirley June c/o P.C.A.L.S. James

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 15:01
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/025; H04N7/035; H04N7/0355; H04N7/0352

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 96 words
A data decoder for decoding data transmitted in one or more lines of a field blanking interval of a television signal, said data decoder being capable of decoding data at one of a plurality of data rates and/or encoding formats and comprising control means having a first state which causes the decoder to attempt to detect data transmitted at a first data rate and having a first encoding format and one or more further states which cause the decoder to attempt to detect data transmitted at one or more different data rates and/or different encoding formats.
Claim 2
Dependent Claim 26 words
A data decoder as claimed in Claim 1 in which said control means is arranged to change state in response to the detection of invalid data.
Claim 3
Dependent Claim 30 words
A data decoder as claimed in Claim 2 in which the control means is arranged to change state only when invalid data has been detected a given number of times.
Claim 4
Dependent Claim 44 words
A data detector as claimed in Claim 2 or Claim 3 in which said control means is arranged to adopt different states only on given lines during a field blanking interval and on all other lines to adopt a given one of said states.
Claim 5
Dependent Claim 17 words
A data decoder as claimed in any preceding claim in which said control means has two states.
Claim 6
Dependent Claim 15 words
A data decoder as claimed in Claim 5 arranged to decode teletext and VPS data.

References Cited (Backward Citations)

EP0420123A2 Cited

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