Patent US3780371A successfully refreshed from Google Patents.
Patent US4302777A successfully refreshed from Google Patents.
US4302777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flare compensation circuit for television
Assignee: US Philips Corp
•
Filing: 1980-05-15
•
Granted: 1981-11-24
•
Expires: 2000-05-15
Abstract
Abstract A flare or scattered light compensation circuit for television, wherein a controllable signal difference amplifier is present to a first input of which a picture signal, affected by flare or scattered light, is applied, a compensation signal obtained by signal integration being applied to a second input. The gain factor of the amplifier is controlled substantially proportional to the quotient of the peak-peak value of the picture signal and of the difference value of the said peak-peak value and the value of the compensation signal.
Inventors
- 👤 Rudolf Kemner
- 👤 Bernardus G. J. Kuilman
- 👤 Hilbrand J. Smit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:29
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/81
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
A flare compensation circuit for television, the circuit comprising a signal integration circuit having an input for receiving a picture signal affected by flare or scattered light and an output for supplying a compensation signal derived therefrom, also comprising a signal difference amplifier circuit having a first input for receiving the picture signal and a second input for receiving the compensation signal, characterized in that the signal difference amplifier circuit comprises a controllable amplifier a control input of which is connected to the output of a second amplifier circuit having an input for receiving the said compensation signal, the gain factor of the controllable amplifier being substantially proportional to the quotient of the peak-peak value, which has been fixed at a predetermined value, of the picture signal affected by the flare, and of the difference value of this peak-peak value and the value of the compensation signal.
Claim 2
Dependent Claim
147 words
A flare compensation circuit for television, the circuit comprising a signal integration circuit having an input for receiving a picture signal affected by flare or scattered light and an output for supplying a compensation signal derived therefrom, also comprising a signal difference amplifier circuit having a first input for receiving the picture signal and a second input for receiving the compensation signal, characterized in that the signal difference amplifier circuit comprises a controllable amplifier a control input of which is connected to the output of a second amplifier circuit having an input for receiving the said compensation signal, the gain factor of the controllable amplifier being substantially proportional to the quotient of the peak-peak value, which has been fixed at a predetermined value, of the picture signal affected by the flare, and of the difference value of this peak-peak value and the value of the compensation signal.
Claim 3
Dependent Claim
29 words
A scattered light or flare compensation circuit as claimed in claim 1, characterized in that the gain factor of the signal difference amplifier circuit is substantially equal to unity.
Claim 4
Dependent Claim
28 words
A scattered light or flare compensation circuit as claimed in claim 1 or 2, characterized in that the controllable amplifier is constructed as a controllable signal difference amplifier.
Claim 5
Dependent Claim
39 words
A scattered light or flare compensation circuit as claimed in claim 1 or 2, characterized in that the second amplifier circuit comprises a voltage source for setting the gain factor of the controllable amplifier in a linear control range.
Claim 6
Dependent Claim
43 words
A scattered light or flare compensation circuit as claimed in claim 1 or 2, characterized in that the second input of said signal difference amplifier circuit, for receiving the compensation signal, is connected to a short-circuiting circuit for line and field blanking periods.
References Cited (Backward Citations)
US3621132A
Cited
US4001502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |