Vertical aperture correction circuit
Abstract
Abstract VERTICAL APERTURES CORRECTION FOR A TELEVISION CAMERA IS ACHIEVED USING BUT A SINGLE QUARTZ DELAY LINE HAVING A DELAY TIME OF ONE HORIZONTAL LINE BY MODULATING THE VIDEO SIGNAL ON A FIRST CARRIER OF GIVEN FREQUENCY AND PHASE AND SUPPLYING THE MODULATED CARRIER TO THE DELAY LINE. THE MODULATED CARRIER, THUS DELAYED BY THE DURATION OF ONE, HORIZONTAL LINE IS DEMODULATED AND THE MODULATING VIDEO SIGNAL IS MODULATED ON A SECOND CARRIER OF THE SAME FREQUENCY AS THE FIRST CARRIER BUT PHASE-DISPLACED THEREFROM BY 90*. THE SECOND MODULATED CARRIER, THUS DELAYED BY THE DURATION OF TWO HORIZONTAL LINES, IS DEMONDULATED AND THE MODULATING SIGNAL IS COMBINED WITH THE UNDELAYED VIDEO SIGNAL AND THE VIDEO SIGNAL DELAYED BY ONE HORIZONTAL LINE TO PRODUCE A COMPOSITE, VERTICAL APERTURECORRECTED VIDEO SIGNAL.
Inventors
- 👤 Max H Diehl
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |