Patent US3866062A successfully refreshed from Google Patents.
US3866062A
Expired / Lapsed
US
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Circuit arrangement for synchronising of the line deflection in a television receiver with a sawtooth signal having constant mean value and slope
Assignee: US Philips Corp
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Filing: 1973-10-02
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Granted: 1975-02-11
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Expires: 1993-10-02
Abstract
Abstract A circuit arrangement for generating a sawtooth voltage for synchronising the line deflection in a television receiver. The line flyback pulses are greatly limited and serve to discharge a capacitor. By controlling the edge of the sawtooth occurring during the scan period, its mean value is maintained constant. In cooperation with a phase discriminator horizontal shifts of the image are avoided because the scan remains symmetrical with respect to the centre in case of variations of the duration of the line flyback pulses.
Inventors
- 👤 Hans-Heinrich Feindt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:08
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H04; H04N; H04N5/00; H04N5/04; H04N5/12; H04N5/126
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
A circuit for producing a sawtooth signal from a television horizontal flyback pulse, said circuit comprising limiting means having an input means for receiving said flyback pulse and an output means for supplying an amplitude limited flyback pulse; a capacitor; and means for producing said sawtooth signal with a substantially constant mean value and flyback period slope regardless of duration changes in said flyback pulse comprising means coupled to said capacitor and said output means for discharging said capacitor during the occurrence of said flyback period and charging said capacitor during the horizontal scanning period.
Claim 2
Dependent Claim
95 words
A circuit for producing a sawtooth signal from a television horizontal flyback pulse, said circuit comprising limiting means having an input means for receiving said flyback pulse and an output means for supplying an amplitude limited flyback pulse; a capacitor; and means for producing said sawtooth signal with a substantially constant mean value and flyback period slope regardless of duration changes in said flyback pulse comprising means coupled to said capacitor and said output means for discharging said capacitor during the occurrence of said flyback period and charging said capacitor during the horizontal scanning period.
Claim 3
Dependent Claim
74 words
A circuit as claimed in claim 1 wherein said charging and discharging means comprises filter means coupled to said output means for generating a signal having an amplitude in accordance with the mean value of said flyback pulse, a difference amplifier having a first input means coupled to said mean value generator and a second input means for receiving a reference voltage, and a charging transistor coupled to said amplifier and to said capacitor.
Claim 4
Dependent Claim
29 words
A circuit as claimed in claim 2 further comprising means coupled to said limiting means for effecting cutoff of said charging transistor during the occurrence of said flyback pulses.
Claim 5
Dependent Claim
56 words
A circuit as claimed in claim 2 wherein said difference amplifier comprises a pair of transistors having emitters coupled together, a further transistor having a collector coupled to said emitters, and means coupled to said further transistor and said output means for cutting off said further transistor during the occurrence of said amplitude limited flyback pulse.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |