Altitude rate transducer and computing circuit
Abstract
Abstract AN ALTITUDE RATE SIGNAL IS DEVELOPED ELECTRONICALLY BY DIFFERENTIATING A STATIC PRESSURE SIGNAL P AND SOLVING THE EQUATION DH/DT=-(K/P).(DP/DT) BY LINEAR OPERATIONS WHICH INCLUDE REPRESENTING THE PRODUCT OF P BY A VARIABLE VOLTAGE. IN ONE MODIFICATION A PIEZORESISTIVE STATIC PRESSURE TRANSDUCER IS ENERGIZED BY THE VOLTAGE, AND THE TRANSDUCER OUTPUT IS UTILIZED TO REPRESENT THE PRODUCT. ANOTHER MODIFICATION REPRESENTS THE PRODUCT BY LINEAR CIRCUITRY CAPABLE GENERALLY OF DERIVING ANY FUNCTION OF THE FORM AB/C FROM INPUT SIGNALS REPRESENTING A, B AND C. TWO CHOPPERS ARE DRIVEN SYNCHRONOUSLY WITH VARIABLE ON-OFF RATIO. CIRCUITRY INCLUDING ONE CHOPPER MAINTAINS THE CHOPPING RATIO PROPORTIONAL TO B/C, WHILE THE OTHER CHOPPER MULTIPLIES THAT FUNCTION BY A.
Inventors
- 👤 Robert Feuer
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |