US4202013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line time base in television receiver
Assignee: US Philips Corp
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Filing: 1973-09-24
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Granted: 1980-05-06
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Expires: 1993-09-24
Abstract
Abstract A line time base in a television receiver including a symmetrical limiter for cutting off the line flyback pulses from which the reference signal for the synchronizing circuit is derived. As a result a slice is obtained whose duration and amplitude is constant and independent of the load on the EHT generator.
Inventors
- 👤 Johannes S. A. van Hattum
- 👤 Jan A. C. Korver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:49
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/12; H04N5/126; H03; H03G; H03G11/00; H03G11/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A circuit for producing from a television line flyback signal a stable reference signal regardless of the load upon the line signal source, said circuit comprising input means for receiving a line flyback signal; means direct current coupled to said input means for amplitude limiting said flyback signal to a first voltage if said flyback signal is above said first voltage; means direct current coupled to said input means for amplitude limiting said flyback signal to a second voltage if said flyback signal is below said second voltage and an output means coupled to limiting means for supplying a reference signal in accordance with said limited flyback signals.
Claim 2
Dependent Claim
108 words
A circuit for producing from a television line flyback signal a stable reference signal regardless of the load upon the line signal source, said circuit comprising input means for receiving a line flyback signal; means direct current coupled to said input means for amplitude limiting said flyback signal to a first voltage if said flyback signal is above said first voltage; means direct current coupled to said input means for amplitude limiting said flyback signal to a second voltage if said flyback signal is below said second voltage and an output means coupled to limiting means for supplying a reference signal in accordance with said limited flyback signals.
Claim 3
Dependent Claim
72 words
A circuit as claimed in claim 1 wherein said input means comprises a first resistor adapted to receive said flyback pulses, and a second resistor coupled to said first resistor and a first potential; said limiting means each comprises a diode, said diodes having opposite type electrodes parallel coupled together and to ground and to the junction of said resistors respectively, said junction having a second potential higher than said first potential.
Claim 4
Dependent Claim
23 words
A circuit as claimed in claim 2 wherein said input means further comprises a variable third resistor series coupled to said first resistor.
Claim 5
Dependent Claim
27 words
A circuit as claimed in claim 1 wherein said input means further comprises means for adjusting the magnitude of said input signal, applied to said limiting means.
Claim 6
Dependent Claim
15 words
A circuit as claimed in claim 1 wherein said output means comprises an integrator circuit.
References Cited (Backward Citations)
US2137798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |