Rf ampl
Abstract
Abstract IMPROVEMENT IN COMMUNICATIONS RECEIVERS OF THE TYPE HAVING AN INTERMEDIATE FREQUENCY PASSBAND SUBSTANTIALLY WIDER THAN THE BANDWIDTH OF THE RECEIVED SIGNAL, SUCH IMPROVEMENT INVOLVING GATING MEANS COMPARING THE ENERGIES IN FREQUENCY RELATED SEGMENTS OF THE RECEIVER PASSBAND AND PASSING AD RECEIVER OUTPUT ONLY SUCH SEGMENTS AS HAVING A DIFFERENT ENERGY LEVEL (CAUSED BY SIGNAL PRESENCE) THAN THE ENERGY LEVELS IN OTHER OF THE SEGMENTS (CAUSED BY NOISE ENERGY). SUCH GATING MEANS CAN ALSO BE EMPLOYED FOR SQUELCH CONTROL, WITH THE RECIVER TENDERED SENSITIVE WHEN THE ENERGY LEVELS IN THE PASSBAND SEGMENTS ARE SUBSTANTIALLY DIFFERENT (I.E. SIGNAL ENERGY IS PRESENT) AND SQUELCHED WHEN THE ENERGY LEVELS IN THE SEGMENTS ARE SUBSTANTIALLY THE SAME (I.E. ONLY NOISE ENERGY IS PRESENT)
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |