US3878557A
Expired / Lapsed
US
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Color framing videotape recording apparatus and method
Assignee: INTERNATIONAL VIDEO CORP
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Filing: 1974-03-15
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Granted: 1975-04-15
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Expires: 1994-03-15
Abstract
Abstract Automatic color framing for editing in a video tape recorder is provided by associating one of the two possible color frame phases with one of the two possible phase relationships between the off-tape color burst and the incoming video color burst. If this association results in the locking of the video tape recorder to the incorrect color frame, the association of the input color burst phase relationship to the color frame phases is reversed to provide correct color framing in subsequent edits in response to the off-tape to input video color burst phase so long as the input video horizontal sync to color burst phase remains substantially constant.
Inventors
- 👤 Nikola Vidovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:35
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/029; G11B27/024; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
418 words
A method for providing automatic color framing in a video tape recorder wherein incoming color video signals having substantially stable horizontal sync to color burst phase are edit recorded adjacent previously recorded color video signals having a substantially stable horizontal sync to color burst phase, said video tape recorder including means for synchronizing in one of two possible phase relationships a signal at the color frame rate of the previously recorded color video signals with a reference signal at the color frame rate derived from the incoming color video signals, the method comprising comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals to define said phase relation as the first phase relation to associate said first phase relation with synchronization in one of said two possible phase relationships of said signal at the color frame rate of the previously recorded color video signals and said reference signal at the color frame rate derived from the incoming color video signals, and to define a 180* shifted phase relation of said color bursts as the second phase relation to associate said second phase relation with synchronization in the other of said two possible phase relationships of said signal at the color frame rate of the previously recorded color video signals, edit recording said incoming color video signals adjacent said previously recorded color video signals, reproducing said previously recorded color video signals and said newly edited recorded incoming color video signals, reversing the association of said first and second phase relations of said color bursts to said possible phase relationships of said signal at the color frame rate of the previously recorded color video signals and said reference signal at the color frame rate derived from the incoming color video signals when the reproduced previously recorded color video signals and said newly edited recorded color video signals have a 180* color burst phase shift at the edit point whereby the comparison of the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced color video signals to determine if said phase relation is substantially said first or substantially said second phase relation causes synchronization in the associated one of said two possible phase relationships of said signal at the color frame rate of the previously recorded color video signals and said reference signal at the color frame rate derived from the incoming color video signals.
Claim 2
Independent Claim
418 words
A method for providing automatic color framing in a video tape recorder wherein incoming color video signals having substantially stable horizontal sync to color burst phase are edit recorded adjacent previously recorded color video signals having a substantially stable horizontal sync to color burst phase, said video tape recorder including means for synchronizing in one of two possible phase relationships a signal at the color frame rate of the previously recorded color video signals with a reference signal at the color frame rate derived from the incoming color video signals, the method comprising comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals to define said phase relation as the first phase relation to associate said first phase relation with synchronization in one of said two possible phase relationships of said signal at the color frame rate of the previously recorded color video signals and said reference signal at the color frame rate derived from the incoming color video signals, and to define a 180* shifted phase relation of said color bursts as the second phase relation to associate said second phase relation with synchronization in the other of said two possible phase relationships of said signal at the color frame rate of the previously recorded color video signals, edit recording said incoming color video signals adjacent said previously recorded color video signals, reproducing said previously recorded color video signals and said newly edited recorded incoming color video signals, reversing the association of said first and second phase relations of said color bursts to said possible phase relationships of said signal at the color frame rate of the previously recorded color video signals and said reference signal at the color frame rate derived from the incoming color video signals when the reproduced previously recorded color video signals and said newly edited recorded color video signals have a 180* color burst phase shift at the edit point whereby the comparison of the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced color video signals to determine if said phase relation is substantially said first or substantially said second phase relation causes synchronization in the associated one of said two possible phase relationships of said signal at the color frame rate of the previously recorded color video signals and said reference signal at the color frame rate derived from the incoming color video signals.
Claim 3
Dependent Claim
93 words
The method of claim 1 wherein said step of comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals includes the steps of generating a first stable color subcarrier signal in response to said color burst of the incoming color video signals, generating a second stable color subcarrier signal in response to said color burst of the reproduced previously recorded color video signals, and comparing the phase relation of said first and second stable color subcarrier signals.
Claim 4
Dependent Claim
198 words
In a video tape recorder wherein incoming color video signals having substantially stable horizontal sync to color burst phase are edit recorded adjacent previously recorded color video signals having a substantially stable horizontal sync to color burst phase, said video tape recorder including means for synchronizing in one of two possible phase relationships a signal at the color frame rate of the previously recorded color video signals with a reference signal at the color frame rate derived from the incoming color video signals, color framing apparatus comprising means for comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals to generate a first signal when said phase relation is and to generate a second signal when said phase relations is Theta + 180*, means for applying said first and second signals to said means for synchronizing to synchronize said color frame rate signals in a first phase relationship in response to said first signal and to synchronize said color frame rate signals in a second phase relationship in response to said second signal, and means for reversing said first and second signals.
Claim 5
Dependent Claim
198 words
In a video tape recorder wherein incoming color video signals having substantially stable horizontal sync to color burst phase are edit recorded adjacent previously recorded color video signals having a substantially stable horizontal sync to color burst phase, said video tape recorder including means for synchronizing in one of two possible phase relationships a signal at the color frame rate of the previously recorded color video signals with a reference signal at the color frame rate derived from the incoming color video signals, color framing apparatus comprising means for comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals to generate a first signal when said phase relation is and to generate a second signal when said phase relations is Theta + 180*, means for applying said first and second signals to said means for synchronizing to synchronize said color frame rate signals in a first phase relationship in response to said first signal and to synchronize said color frame rate signals in a second phase relationship in response to said second signal, and means for reversing said first and second signals.
Claim 6
Dependent Claim
77 words
The combination of claim 3 wherein said means for comparing the phase relation of said color bursts includes means for generating a first stable color subcarrier in response to said color burst of the input color video signals, means for generating a second stable color subcarrier signal in response to said color burst of the reproduced previously recorded color video signals, and means for comparing the phase relation of said first and second stable color subcarrier signals.
Claim 7
Dependent Claim
58 words
The combination of claim 4 wherein said means for comparing the phase relation of said first and second stable color subcarrier signals comprises means for adding said first and second stable subcarrier signals, and means for detecting the relative amplitude of said added first and second stable subcarrier signals to detect the relative phase of said subcarrier signals.
Claim 8
Dependent Claim
27 words
The combination of claim 5 wherein said means for reversing said first and second signals comprises means for shifting the phase of one of said subcarrier signals.
Claim 9
Dependent Claim
221 words
In a video tape recorder wherein incoming color video signals having substantially stable horizontal sync to color burst phase are edit recorded adjacent previously recorded color video signals having a substantially stable horizontal sync to color burst phase, said video tape recorder including means for synchronizing in one of two possible phase relationships a signal at the color frame rate of the previously recorded color video signals with a reference signal at the color frame rate derived from the incoming color video signals, the relative phase of the incoming video signals'' color burst to the previously recorded video signals'' color burst defining the correct phase relationship of said color frame rate signals, color framing apparatus comprising means for comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals to generate a first signal when said phase relation is Theta * and to generate a second signal when said phase relation is Theta + 180*, and means for applying said first and second signals to said means for synchronizing to synchronize said color frame rate signals in a first phase relationship in response to said first signal and to synchronize said color frame rate signals in a second phase relationship in response to said second signal.
Claim 10
Dependent Claim
221 words
In a video tape recorder wherein incoming color video signals having substantially stable horizontal sync to color burst phase are edit recorded adjacent previously recorded color video signals having a substantially stable horizontal sync to color burst phase, said video tape recorder including means for synchronizing in one of two possible phase relationships a signal at the color frame rate of the previously recorded color video signals with a reference signal at the color frame rate derived from the incoming color video signals, the relative phase of the incoming video signals'' color burst to the previously recorded video signals'' color burst defining the correct phase relationship of said color frame rate signals, color framing apparatus comprising means for comparing the phase relation of the color burst of the incoming color video signals to the color burst of the reproduced previously recorded color video signals to generate a first signal when said phase relation is Theta * and to generate a second signal when said phase relation is Theta + 180*, and means for applying said first and second signals to said means for synchronizing to synchronize said color frame rate signals in a first phase relationship in response to said first signal and to synchronize said color frame rate signals in a second phase relationship in response to said second signal.
Claim 11
Dependent Claim
77 words
The combination of claim 7 wherein said means for comparing the phase relation of said color bursts includes means for generating a first stable color subcarrier in response to said color burst of the input color video signals, means for generating a second stable color subcarrier signal in response to said color burst of the reproduced previously recorded color video signals, and means for comParing the phase relation of said first and second stable color subcarrier signals.
Claim 12
Dependent Claim
58 words
The combination of claim 8 wherein said means for comparing the phase relation of said first and second stable color subcarrier signals comprises means for adding said first and second stable subcarrier signals, and means for detecting the relative amplitude of said added first and second stable subcarrier signals to detect the relative phase of said subcarrier signals.
References Cited (Backward Citations)
US3761604A
Cited
US3735015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |