Frequency control circuit
Abstract
Abstract A FREQUENCY CONTROL CIRCUIT UTILIZING A PAIR OF OSCILLATORS OPERATING AT DIFFERENT FREQUENCIES AS THE SIGNAL SOURCE FOR A TELEVISION TRANSMITTER. THE OUPUTS OF THE TWO OSCILLATORS ARE MIXED TOGETHER TO PROVIDE A DIFFERENCE FREQUENCY FROM WHICH IS DERIVED THE FINAL OUTPUT TRANSMITTING FREQUENCY. ALSO, THE DIFFERENCE FREQUENCY IS COUPLED TO A PHASE DETECTOR WHERE IT IS COMPARED WITH A SIGNAL DERIVED FROM A PRECISION REFERENCE SOURCE. DEVIATION BETWEEN THE TWO INPUTS TO THE PHASE DETECTOR RESULT IN AN ERROR SIGNAL WHICH IS THEN COUPLED TO ONE OF THE TWO OSCILLATORS TO CONTROL THE FREQUENCY THEREOF SO THAT THE TWO INPUTS TO THE PHASE DETECTOR HAVE SUBSTANTIALLY EQUAL FREQUENCIES.
Inventors
- 👤 A Hans Bott
Bibliographic Details
Claims Analysis
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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 |