US4739228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric circuit for S correction of the vertical scanning ramp in a television apparatus
Assignee: STRADALE PRIMOSOLE
•
Filing: 1986-05-16
•
Granted: 1988-04-19
•
Expires: 2006-05-16
Abstract
Abstract A variable-gain rectifier-amplifier with regulated voltage converts the output ramp of a ramp generator with regulating resistance of ramp amplitude into a triangular wave form with adjustable linearity which a feedback circuit brings back to said regulating resistance in the form of alternating current superimposing it on the direct current regulated through said resistance. This provides an S correction of the output ramp which depends on the gain regulation voltage of the rectifier-amplifier circuit.
Inventors
- 👤 Roberto Viscardi
- 👤 Silvano Coccetti
- 👤 Silvano Gornati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:14
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
An electronic circuit for S correcting the output of a ramp generator for use as a vertical scanning ramp in a television apparatus, said ramp generator comprising a direct current generator, a capacitance charged by said current generator, a switch for periodic discharge of said capacitance and an adjustable resistance for adjustment of the amplitude of the generated ramp, said electronic circuit comprising: a variable gain rectifier-amplifier circuit with regulated voltage which receives the output of said ramp generator, and a feedback circuit which feeds back to the ramp generator an alternating current signal the amplitude and wave-form of which is dependent upon the output voltage of said variable-gain rectifier-amplifier circuit.
Claim 2
Dependent Claim
111 words
An electronic circuit for S correcting the output of a ramp generator for use as a vertical scanning ramp in a television apparatus, said ramp generator comprising a direct current generator, a capacitance charged by said current generator, a switch for periodic discharge of said capacitance and an adjustable resistance for adjustment of the amplitude of the generated ramp, said electronic circuit comprising: a variable gain rectifier-amplifier circuit with regulated voltage which receives the output of said ramp generator, and a feedback circuit which feeds back to the ramp generator an alternating current signal the amplitude and wave-form of which is dependent upon the output voltage of said variable-gain rectifier-amplifier circuit.
Claim 3
Dependent Claim
34 words
A circuit in accordance with claim 1 wherein said feedback circuit comprises a capacitor for cancelling out any deviations from the mean value of said alternating current signal when compared with a reference value.
Claim 4
Dependent Claim
29 words
A circuit in accordance with claim 1 wherein said variable gain rectifier-amplifier circuit comprises a variable gain differential amplifier having a linearity control input terminal and a differential rectifier.
Claim 5
Dependent Claim
37 words
A circuit in accordance with claim 1 wherein said variable gain rectifier amplifier comprises a transconductance differential amplifier circuit which generates a parabolic signal on an external capacitance, said parabolic signal being input to said feedback circuit.
Claim 6
Dependent Claim
29 words
A circuit in accordance with claim 1 wherein said variable gain rectifier-amplifier circuit comprises a differential rectifier-amplifier, a linearity regulator having a linearity control terminal, and a parabola generator.
Claim 7
Dependent Claim
15 words
A circuit in accordance with claim 5 wherein said parabola generator comprises a multiemitter transistor.
References Cited (Backward Citations)
US3723804A
Cited
US3735192A
Cited
US3863106A
Cited
US4365270A
Cited
US4533855A
Cited
US4645987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |