US4520392A
Expired / Lapsed
US
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Teletext reception indicator
Assignee: ZEITH ELECTRONICS Corp
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Filing: 1983-03-04
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Granted: 1985-05-28
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Expires: 2003-03-04
Abstract
Abstract An indicator is described for alerting a television viewer to the fact that a teletext signal is being received. In the preferred embodiment, the indicator includes a control which senses the detection of the framing code associated with the received teletext signal to actuate an indicator lamp.
Inventors
- 👤 Charles M. Cox
- 👤 Charles Heuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:00
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/40; H04N21/47; H04N21/488; H04N21/4888; H04N7/00; H04N7/08; H04N7/087; H04N7/088; H04N7/0882; H04N5/00; H04N5/44; H04N5/445; H04N5/44504
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator, comprising: control means associated with the teletext decoder and responsive to the decoder's detection of a framing code for generating a control signal, said control means being responsive to vertical rate gate pulses for resetting the control signal; and indicating means responsive to the control signal for indicating the receipt of a valid teletext signal.
Claim 2
Dependent Claim
72 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator, comprising: control means associated with the teletext decoder and responsive to the decoder's detection of a framing code for generating a control signal, said control means being responsive to vertical rate gate pulses for resetting the control signal; and indicating means responsive to the control signal for indicating the receipt of a valid teletext signal.
Claim 3
Dependent Claim
67 words
A teletext indicator as set forth in claim 1 wherein said control means includes first gate means responsive to framing code data developed by the decoder for generating a first output, and second gate means responsive to said first output for developing a second output signal indicative of the receipt of a teletext signal and responsive to vertical rate gate pulses for resetting the second output signal.
Claim 4
Dependent Claim
28 words
A teletext indicator as set forth in claim 2 wherein said first gate means is enabled by a window signal which occurs concurrently with a valid framing code.
Claim 5
Dependent Claim
38 words
A teletext indicator as set forth in claim 1 further including means for latching the control signal in response to the vertical rate gate pulses to develop a further signal useful for automatically actuating recording of teletext data.
Claim 6
Dependent Claim
83 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator comprising: control means comprising first counting means responsive to the detection of N framing codes by the teletext decoder for initiating a control signal and second counting means responsive to N vertical rate gate pulses developed immediately following the generation of a control signal for resetting the control signal; and indicating means responsive to the control signal for indicating the receipt of a valid teletext signal.
Claim 7
Dependent Claim
83 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator comprising: control means comprising first counting means responsive to the detection of N framing codes by the teletext decoder for initiating a control signal and second counting means responsive to N vertical rate gate pulses developed immediately following the generation of a control signal for resetting the control signal; and indicating means responsive to the control signal for indicating the receipt of a valid teletext signal.
Claim 8
Dependent Claim
99 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator, comprising: a gate for sensing the decoder's detection of a framing code; means for applying to said gate a window enable signal which occurs concurrently with a valid framing code, thereby to provide a first output signal corresponding to a windowed framing code; a first flip-flop responsive to said first output signal for developing a control signal; means for resetting the flip-flop at a vertical rate; and means responsive to the control signal for indicating the receipt of a valid teletext signal.
Claim 9
Dependent Claim
99 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator, comprising: a gate for sensing the decoder's detection of a framing code; means for applying to said gate a window enable signal which occurs concurrently with a valid framing code, thereby to provide a first output signal corresponding to a windowed framing code; a first flip-flop responsive to said first output signal for developing a control signal; means for resetting the flip-flop at a vertical rate; and means responsive to the control signal for indicating the receipt of a valid teletext signal.
Claim 10
Dependent Claim
179 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator comprising: a gate for sensing the decoder's detection of a framing code; means for applying to said gate a window enable signal which occurs concurrently with a valid framing code, thereby to provide a first output signal corresponding to a windowed framing code; a first flip-flop responsive to said first output signal for developing a first control signal; means for developing a vertical rate gate signal; means for resetting said first flip-flop at a vertical rate in response to said vertical rate gate signal; first counting means responsive to the development of N first control signals for developing a second output signal; a second flip-flop responsive to said second output signal for developing a second control signal; second counting means enabled by said second control signal for counting N vertical rate gate signals for developing a reset control signal coupled for resetting said second flip-flop; and means responsive to the second control signal for indicating the receipt of a valid teletext signal.
Claim 11
Dependent Claim
179 words
For use with a teletext decoder which decodes teletext signals having a framing code, a teletext indicator comprising: a gate for sensing the decoder's detection of a framing code; means for applying to said gate a window enable signal which occurs concurrently with a valid framing code, thereby to provide a first output signal corresponding to a windowed framing code; a first flip-flop responsive to said first output signal for developing a first control signal; means for developing a vertical rate gate signal; means for resetting said first flip-flop at a vertical rate in response to said vertical rate gate signal; first counting means responsive to the development of N first control signals for developing a second output signal; a second flip-flop responsive to said second output signal for developing a second control signal; second counting means enabled by said second control signal for counting N vertical rate gate signals for developing a reset control signal coupled for resetting said second flip-flop; and means responsive to the second control signal for indicating the receipt of a valid teletext signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |