US3567860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television synchronizing system
Assignee: HP Inc
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Filing: 1968-03-07
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Granted: 1971-03-02
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Expires: 1988-03-07
Abstract
Abstract A sync stripper removes the picture signal from the composite video input signal leaving a composite synchronizing signal that includes horizontal and vertical sync pulses. An oscillator produces a periodic timing signal having a repetition rate equal to twice that of the horizontal sync pulses. This timing signal is supplied to a binary scaler to produce a synchronizing signal for periodically triggering a horizontal deflection circuit at a repetition rate equal to that of the horizontal sync pulses. A feedback circuit, responsive to this synchronizing signal and to the composite synchronizing signal, phase locks the oscillator to the composite synchronizing signal and maintains the repetition rate of the oscillator at twice that of the horizontal sync pulses. The timing signal is also supplied to a gate that is periodically enabled in response to the vertical sync pulses to provide a synchronizing signal for periodically triggering a vertical deflection circuit at a repetition rate equal to that of the vertical sync pulses.
Inventors
- 👤 Bernard M Oliver
- 👤 Richard E Monnier
- 👤 Gregory Justice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:33
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/08; H04N5/10; H04N5/12; H04N5/126
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
168 words
A television synchronizing system for receiving a composite synchronizing signal that includes horizontal sync pulses having a repetition rate fH and vertical sync pulses having a repetition rate fV, said system comprising: an oscillator for producing a periodic timing signal having a repetition rate nfH where n is an integer; an feedback circuit connected to said oscillator for locking the oscillator in phase with the horizontal sync pulses of the composite synchronizing signal; a horizontal deflection circuit; first circuit means connected between said oscillator and said horizontal deflection circuit for dividing the repetition rate of the timing signal by n to supply the horizontal deflection ciRcuit with a horizontal synchronizing signal having a repetition rate fH; a vertical deflection circuit; and second circuit means connected between said oscillator and said vertical deflection circuit and responsive to the vertical sync pulses of the composite synchronizing signal and to portions of the timing signal for supplying the vertical deflection circuit with a vertical synchronizing signal having a repetition rate fV.
Claim 2
Dependent Claim
168 words
A television synchronizing system for receiving a composite synchronizing signal that includes horizontal sync pulses having a repetition rate fH and vertical sync pulses having a repetition rate fV, said system comprising: an oscillator for producing a periodic timing signal having a repetition rate nfH where n is an integer; an feedback circuit connected to said oscillator for locking the oscillator in phase with the horizontal sync pulses of the composite synchronizing signal; a horizontal deflection circuit; first circuit means connected between said oscillator and said horizontal deflection circuit for dividing the repetition rate of the timing signal by n to supply the horizontal deflection ciRcuit with a horizontal synchronizing signal having a repetition rate fH; a vertical deflection circuit; and second circuit means connected between said oscillator and said vertical deflection circuit and responsive to the vertical sync pulses of the composite synchronizing signal and to portions of the timing signal for supplying the vertical deflection circuit with a vertical synchronizing signal having a repetition rate fV.
Claim 3
Dependent Claim
43 words
A television synchronizing system as in claim 1 wherein said second circuit means is responsive to the vertical sync pulses of the composite synchronizing signal for gating portions of the timing signal to supply the vertical deflection circuit with the vertical synchronizing signal.
Claim 4
Dependent Claim
87 words
A television synchronizing system as in claim 2 wherein: said timing signal has a repetition rate equal to 2fH; said first circuit means divides the repetition rate of the timing signal in half to provide the horizontal synchronizing signal; and said second circuit means is responsive to gating signals derived from the vertical sync pulses of the composite synchronizing signal for passing only portions of the timing signal that coincide in time with the gating signals to supply the vertical deflection circuit with the vertical synchronizing signal.
Claim 5
Dependent Claim
85 words
A television synchronizing system as in claim 3 wherein said feedback circuit comprises: first feedback means responsive to the horizontal synchronizing signal and to the composite synchronizing signal for producing an error signal related to the phase difference between these signals; and second feedback means connected to said first feedback means and responsive to the error signal for locking said oscillator in phase with the horizontal sync pulses of the composite synchronizing signal and for stabilizing the repetition rate of the timing signal at 2fH.
Claim 6
Dependent Claim
107 words
A television synchronizing system as in claim 4 wherein said second circuit means comprises: separation means for deriving a gating pulse comprising one of the gating signals from each vertical sync pulse of the composite synchronizing signal; and a gate having an input connected to said oscillator for receiving the timing signal therefrom, having another input connected to said separation means for receiving the gating pulses therefrom, and having an output connected to said vertical deflection circuit for supplying the vertical synchronizing signal thereto, said gate being periodically enabled by the gating pulses for passing said portions of the timing signal to provide the vertical synchronizing signal.
Claim 7
Dependent Claim
92 words
A television synchronizing system as in claim 5 wherein said separation means comprises: third circuit means for providing a vertical sync pulse signal in response to each vertical sync pulse and for filtering out the remaining pulses of the composite synchronizing signal; and a wave shaping circuit connected to said third circuit means, said wave shaping circuit being operative for regenerating the vertical sync pulse signals from said third circuit means to provide the gating pulses and being connected to said other input of said gate for supplying the gating pulses thereto.
Claim 8
Dependent Claim
57 words
A television synchronizing system as in claim 5 wherein said first circuit means comprises a scale of two divider connected to said oscillator for halving the repetition rate of the timing signal to provide the horizontal synchronizing signal, said scale of two divider being connected to said horizontal deflection circuit for supplying the horizontal synchronizing signal thereto.
Claim 9
Dependent Claim
66 words
A television synchronizing system as in claim 5 wherein said first feedback means comprises: a ramp generator responsive to the horizontal synchronizing signal for producing a ramp signal having a repetition rate equal to that of the horizontal synchronizing signal; and a phase comparator connected to said ramp generator and responsive to the ramp signal and to the composite syNchronizing signal for producing the error signal.
Claim 10
Dependent Claim
45 words
A television synchronizing system as in claim 8 wherein said second feedback means comprises a low pass filter connected between said phase comparator and said oscillator, said low pass filter being responsive to the error signal for supplying a stabilizing control signal to said oscillator.
Claim 11
Dependent Claim
55 words
A television synchronizing system as in claim 9 including a wave shaping circuit connected to said phase comparator, said wave shaping circuit being responsive to the composite synchronizing signal signal for supplying said phase comparator with a signal having a repetition rate equal to that of the horizontal sync pulses of the composite synchronizing signal.
Claim 12
Dependent Claim
61 words
A television synchronizing system as in claim 1 wherein said feedback circuit is responsive to the horizontal synchronizing signal and to the composite synchronizing signal for producing an error signal related to the phase difference between these signals and is responsive to the error signal for locking said oscillator in phase with the horizontal sync pulses of the composite synchronizing signal.
Claim 13
Dependent Claim
89 words
A television synchronizing system as in claim 11 wherein said feedback circuit comprises: a ramp generator responsive to the horizontal synchronizing signal for producing a ramp signal having a repetition rate equal to that of the horizontal synchronizing signal; a phase comparator connected to said ramp generator and responsive to the ramp signal and to the composite synchronizing signal for producing the error signal; and means connected between said phase comparator and said oscillator and responsive to the error signal for supplying a stabilizing control signal to said oscillator.
Claim 14
Dependent Claim
66 words
A television synchronizing system as in claim 12 wherein: said last-mentioned means comprises a low pass filter; and said system includes a wave shaping circuit connected to said phase comparator, said wave shaping circuit being responsive to the composite synchronizing signal for supplying said phase comparator with a signal having a repetition rate equal to that of the horizontal sync pulses of the composite synchronizing signal.
Claim 15
Dependent Claim
179 words
A television synchronizing system for receiving a composite synchronizing signal that includes horizontal sync pulses having a repetition rate fH and vertical sync pulses having a repetition rate fV, said system comprising: an oscillator for producing a periodic timing signal having a repetition rate nfH where n is an integer; a feedback circuit connected to said oscillator for locking the oscillator in phase with the horizontal sync pulses of the composite synchronizing signal; a horizontal deflection circuit; means connected between said oscillator and said horizontal deflection circuit for dividing the repetition rate of the timing signal by n to supply the horizontal deflection circuit with a horizontal synchronizing signal having a repetition rate fH; a vertical deflection circuit; and a gate connected between said oscillator and said vertical deflection circuit and responsive to gating pulses derived from the vertical sync pulses of the composite synchronizing signal for passing only those portions of the timing signal that coincide in time with the gating pulses to supply the vertical deflection circuit with a vertical synchronizing signal having a repetition rate fV.
Claim 16
Dependent Claim
179 words
A television synchronizing system for receiving a composite synchronizing signal that includes horizontal sync pulses having a repetition rate fH and vertical sync pulses having a repetition rate fV, said system comprising: an oscillator for producing a periodic timing signal having a repetition rate nfH where n is an integer; a feedback circuit connected to said oscillator for locking the oscillator in phase with the horizontal sync pulses of the composite synchronizing signal; a horizontal deflection circuit; means connected between said oscillator and said horizontal deflection circuit for dividing the repetition rate of the timing signal by n to supply the horizontal deflection circuit with a horizontal synchronizing signal having a repetition rate fH; a vertical deflection circuit; and a gate connected between said oscillator and said vertical deflection circuit and responsive to gating pulses derived from the vertical sync pulses of the composite synchronizing signal for passing only those portions of the timing signal that coincide in time with the gating pulses to supply the vertical deflection circuit with a vertical synchronizing signal having a repetition rate fV.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |