Patent US4603346A successfully refreshed from Google Patents.
US4603346A
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US
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Subcarrier/horizontal sync phase measurement
Assignee: Tektronix Inc
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Filing: 1983-05-27
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Granted: 1986-07-29
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Expires: 2003-05-27
Abstract
Abstract Signals suitable for displaying the phase relationship between the subcarrier wave and the horizontal sync pulse of a composite video signal are provided by establishing coincidence between the d.c. level of the 50 percent point of the sync pulse and the zero crossing point of the subcarrier wave, and generating a reference voltage level at the d.c. level of the 50 percent point of the sync pulse.
Inventors
- 👤 Laurent A. Melling, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:06
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method for providing proper phase relationship between the subcarrier wave and the horizontal sync pulse of a composite video signal, comprising establishing coincidence between the d.c. level of the 50 percent point of the sync pulse and the zero crossing point of the subcarrier wave, and generating a reference voltage level at the d.c. level of the 50 percent point of the sync pulse.
Claim 2
Independent Claim
65 words
A method for providing proper phase relationship between the subcarrier wave and the horizontal sync pulse of a composite video signal, comprising establishing coincidence between the d.c. level of the 50 percent point of the sync pulse and the zero crossing point of the subcarrier wave, and generating a reference voltage level at the d.c. level of the 50 percent point of the sync pulse.
Claim 3
Dependent Claim
23 words
A method according to claim 1, wherein the reference voltage level is generated from the subcarrier wave by gating out the subcarrier wave.
Claim 4
Dependent Claim
51 words
A method according to claim 1, wherein coincidence is established by shifting the d.c. level of the 50 percent point of the sync pulse by 50 percent of the amplitude of the sync pulse, and the reference voltage level is generated from the subcarrier wave by gating out the subcarrier wave.
Claim 5
Independent Claim
69 words
A device for providing proper phase relationship between the subcarrier wave and the horizontal sync pulse of a composite video signal, comprising means for establishing coincidence between the d.c. level of the 50 percent point of the sync pulse and the zero crossing point of the subcarrier wave, and means for generating a reference voltage level at the d.c. level of the 50 percent point of the sync pulse.
Claim 6
Independent Claim
69 words
A device for providing proper phase relationship between the subcarrier wave and the horizontal sync pulse of a composite video signal, comprising means for establishing coincidence between the d.c. level of the 50 percent point of the sync pulse and the zero crossing point of the subcarrier wave, and means for generating a reference voltage level at the d.c. level of the 50 percent point of the sync pulse.
Claim 7
Independent Claim
86 words
A device for providing signals suitable for displaying the phase relationship between a subcarrier wave and the horizontal sync pulses of a composite sync signal having both horizontal and vertical sync pulses comprising: means for gating the subcarrier wave during that portion of the composite sync signal excluding the vertical sync pulses; and means for combining the gated subcarrier wave with the composite sync signal such that the d.c. level of the gated subcarrier wave is at the 50 percent point of the horizontal sync pulses.
Claim 8
Independent Claim
86 words
A device for providing signals suitable for displaying the phase relationship between a subcarrier wave and the horizontal sync pulses of a composite sync signal having both horizontal and vertical sync pulses comprising: means for gating the subcarrier wave during that portion of the composite sync signal excluding the vertical sync pulses; and means for combining the gated subcarrier wave with the composite sync signal such that the d.c. level of the gated subcarrier wave is at the 50 percent point of the horizontal sync pulses.
Claim 9
Dependent Claim
45 words
A device as recited in claim 5 further comprising means for shifting the phase of the composite sync signal with respect to the subcarrier so that the combination of the composite sync signal with the gated subcarrier wave produces a specified color standard television system.
References Cited (Backward Citations)
US4470064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |