Patent US1607946A successfully refreshed from Google Patents.
Patent US5212723A successfully refreshed from Google Patents.
US5212723A
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US
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Burst phase correction system for video descrambling
Assignee: Adeia Media LLC
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Filing: 1991-08-08
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Granted: 1993-05-18
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Expires: 2011-08-08
Abstract
Abstract A method and apparatus for synchronizing a randomized video signal to a phase-locked sampling system. The phase-locked system is part of a scrambling apparatus capable of scrambling and subsequent descrambling of video signals recorded on videotape recorders which undesirably introduce time-base errors into the luminance/chrominance phase relationship. These time-base errors are removed without use of a time-base corrector by programmable delay line memory circuitry which introduces a programmable amount of delay into the video path. The delay line includes a programmable length FIFO memory module.
Inventors
- 👤 K. Heinz Griesshaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/83; H04N7/00; H04N7/16; H04N7/167; H04N7/171; H04N7/1713; H04N9/87; H04N9/89; H04N9/896
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
108 words
A method for capturing a color composite video signal having time base error into a memory for signal manipulation, comprising the steps of: storing the composite video signal having the time base error in the memory; determining if the color burst of a horizontal line of the composite video signal has a phase discrepancy relative to a reference oscillator phase-locked to color bursts of the prior horizontal lines of the signal after reading the content of the memory; providing a delay having an adjustable length; adjusting the length of the delay to compensate for the phase discrepancy; and transmitting the composite video signal through the adjusted length delay.
Claim 2
Independent Claim
108 words
A method for capturing a color composite video signal having time base error into a memory for signal manipulation, comprising the steps of: storing the composite video signal having the time base error in the memory; determining if the color burst of a horizontal line of the composite video signal has a phase discrepancy relative to a reference oscillator phase-locked to color bursts of the prior horizontal lines of the signal after reading the content of the memory; providing a delay having an adjustable length; adjusting the length of the delay to compensate for the phase discrepancy; and transmitting the composite video signal through the adjusted length delay.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein the color burst portions of the video signal have been phase corrected and the luminance portions remain randomized.
Claim 4
Dependent Claim
45 words
The method of claim 2, wherein the step of determining includes detecting if the phase discrepancy is zero, advanced 90°, or retarded 90°, and the step of adjusting includes adjusting the length of the delay by respectively 0, plus one count, or minus one count.
Claim 5
Dependent Claim
52 words
The method of claim 2, wherein the step of determining includes detecting if the phase is zero, advanced 90° or 180°, or retarded 90° or 180°, and the step of adjusting includes adjusting the length of the delay by respectively 0, plus one or two counts, or minus one or two counts.
Claim 6
Dependent Claim
35 words
The method of claim 1, further comprising the step of replacing the original horizontal synchronization signal in each horizontal line of the video signal with a horizontal synchronization signal referenced to an internal sampling clock.
Claim 7
Dependent Claim
42 words
The method of claim 1, wherein the delay is of a length to store a part of the video signal having a duration about from the leading edge of horizontal synchronization to the center of the color burst of the horizontal line.
Claim 8
Independent Claim
125 words
A method of scrambling and descrambling a color composite video signal comprising the steps of: recording the video signal; scrambling the video signal by line rotation of each horizontal line thereof; determining if the chrominance portion of the composite signal, for each particular horizontal line thereof, has a phase discrepancy relative to a reference oscillator phase-locked to color bursts of the prior horizontal lines; digitizing the composite video signal; providing a digital delay line having a programmable length; programming the length of the delay line to compensate for the determined phase discrepancy; transmitting the digitized composite video signal through the programmed delay line; replacing the original horizontal synchronization signal in the particular horizontal line with a time-referenced horizontal synchronization signal; and descrambling the video signal.
Claim 9
Independent Claim
125 words
A method of scrambling and descrambling a color composite video signal comprising the steps of: recording the video signal; scrambling the video signal by line rotation of each horizontal line thereof; determining if the chrominance portion of the composite signal, for each particular horizontal line thereof, has a phase discrepancy relative to a reference oscillator phase-locked to color bursts of the prior horizontal lines; digitizing the composite video signal; providing a digital delay line having a programmable length; programming the length of the delay line to compensate for the determined phase discrepancy; transmitting the digitized composite video signal through the programmed delay line; replacing the original horizontal synchronization signal in the particular horizontal line with a time-referenced horizontal synchronization signal; and descrambling the video signal.
Claim 10
Dependent Claim
39 words
The method of claim 6, wherein the step of scrambling includes insertion in two horizontal lines of recognition data and decoding data, and further comprising descrambling the video signal by recognizing the recognition data and extracting the decoding data.
Claim 11
Independent Claim
109 words
A device for capturing a color composite video signal having time base errors for signal manipulation comprising: a memory for storing the composite video signal having the time base error; means for determining if the color burst of a line of the video signal has a phase discrepancy relative to a reference oscillator phase-locked to color bursts of the prior lines of the signal after reading the video signal stored in the memory; a delay having an adjustable length; means for adjusting the length of the delay to compensate for the phase discrepancy; and means for transmitting the composite video signal from the memory through the adjusted length delay.
Claim 12
Independent Claim
109 words
A device for capturing a color composite video signal having time base errors for signal manipulation comprising: a memory for storing the composite video signal having the time base error; means for determining if the color burst of a line of the video signal has a phase discrepancy relative to a reference oscillator phase-locked to color bursts of the prior lines of the signal after reading the video signal stored in the memory; a delay having an adjustable length; means for adjusting the length of the delay to compensate for the phase discrepancy; and means for transmitting the composite video signal from the memory through the adjusted length delay.
Claim 13
Dependent Claim
27 words
The device of claim 9, wherein the color burst portion of the video signal has been phase corrected and the luminance portion retains the time base errors.
Claim 14
Dependent Claim
51 words
The device of claim 10, wherein the means for determining includes means for detecting if the amount of phase discrepancy is zero, advanced 90°, or retarded 90°, and the means for adjusting in response thereto adjusts the length of the delay by respectively 0, plus one count, or minus one count.
Claim 15
Dependent Claim
57 words
The device of claim 11, wherein the means for determining includes means for detecting if the phase discrepancy is zero, advanced 90° or 180°, or retarded 90° or 180°, and the means for adjusting includes means for adjusting the length of the delay by respectively 0, plus one or two counts, or minus one or two counts.
Claim 16
Dependent Claim
69 words
The device of claim 9, wherein the delay includes two fixed length FIFO memory modules and one programmable length FIFO memory module, the three memory models being connected in series and having a total delay time equal to the duration of a portion of one line of the video signal extending from the leading edge of horizontal sync to the center of the color bust of the one line.
Claim 17
Independent Claim
129 words
A device for scrambling and descrambling a color composite video signal comprising: a scrambler for scrambling the composite video signal by line rotation of each horizontal line thereof; means for determining the amount of phase discrepancy between the chrominance portion of each horizontal line of the scrambled video signal and a reference oscillator phase-locked to a color burst of a prior line; a digitizer for digitizing the scrambled composite video signal; a programmable length FIFO memory delay line connected to receive the digitized composite video signal; means for programming the length of the delay line to compensate for the amount of phase discrepancy in each horizontal line; means for time correcting by resetting the horizontal synchronization signal in each horizontal line; and a descrambler for descrambling the video signal.
Claim 18
Independent Claim
129 words
A device for scrambling and descrambling a color composite video signal comprising: a scrambler for scrambling the composite video signal by line rotation of each horizontal line thereof; means for determining the amount of phase discrepancy between the chrominance portion of each horizontal line of the scrambled video signal and a reference oscillator phase-locked to a color burst of a prior line; a digitizer for digitizing the scrambled composite video signal; a programmable length FIFO memory delay line connected to receive the digitized composite video signal; means for programming the length of the delay line to compensate for the amount of phase discrepancy in each horizontal line; means for time correcting by resetting the horizontal synchronization signal in each horizontal line; and a descrambler for descrambling the video signal.
Claim 19
Dependent Claim
35 words
The device of claim 14, wherein the scrambler inserts in two horizontal lines recognition data and decoding data; and wherein the descrambler recognizes the recognition data and descrambles the video signal using the decoding data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |