Patent US4227191A successfully refreshed from Google Patents.
US3916319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive sweep generator for a spectrum analyzer
Assignee: HP Inc
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Filing: 1974-06-19
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Granted: 1975-10-28
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Expires: 1994-06-19
Abstract
Abstract A spectrum analyzer is provided with a horizontal sweep generator that causes the analyzer to sweep at a fast rate when no signal is being detected. When a signal is detected the sweep generator stops sweeping, backs up and tunes the spectrum analyzer slowly through the detected signal to produce a calibrated display. After the signal has been detected and the analyzer has been tuned beyond it, the sweep rate is again increased until another signal is encountered.
Inventors
- 👤 Jr Irving Hurd Hawley
- 👤 Siegfried Helmut Linkwitz
- 👤 Michael Stanley Marzalek
- 👤 William Livingston Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:37
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/16; G01R23/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
219 words
A scan voltage Generator for a swept frequency receiver having tuning and detecting circuits, the scan voltage generator comprising: ramp generator means connected to the tuning circuit for generating a voltage ramp; first rate control means connected to the ramp generator means for causing the ramp generator means to generate a first voltage ramp to tune the receiver at a first rate; second rate control means connected to the ramp generator means for causing the ramp generator means to generate a second voltage ramp to tune the receiver at a second rate slower than the first rate; reversing means connected to the ramp generator means for causing the ramp generator means to reverse the direction of the voltage ramp; signal detection means connected to the detecting circuits for indicating that the receiver has detected a signal; and logic control means connected to the first and second rate control means, the reversing means and the signal detection means for energizing the first rate control means when the signal detection means is not indicating the detection of a signal and for sequentially energizing the reversing means and the second rate control means when the signal detection means is indicating the detection of a signal so that the receiver tunes back past the detected signal before tuning at the second slower rate.
Claim 2
Dependent Claim
219 words
A scan voltage Generator for a swept frequency receiver having tuning and detecting circuits, the scan voltage generator comprising: ramp generator means connected to the tuning circuit for generating a voltage ramp; first rate control means connected to the ramp generator means for causing the ramp generator means to generate a first voltage ramp to tune the receiver at a first rate; second rate control means connected to the ramp generator means for causing the ramp generator means to generate a second voltage ramp to tune the receiver at a second rate slower than the first rate; reversing means connected to the ramp generator means for causing the ramp generator means to reverse the direction of the voltage ramp; signal detection means connected to the detecting circuits for indicating that the receiver has detected a signal; and logic control means connected to the first and second rate control means, the reversing means and the signal detection means for energizing the first rate control means when the signal detection means is not indicating the detection of a signal and for sequentially energizing the reversing means and the second rate control means when the signal detection means is indicating the detection of a signal so that the receiver tunes back past the detected signal before tuning at the second slower rate.
Claim 3
Dependent Claim
40 words
A scan voltage generator as in claim 1 wherein the logic means energizes the first rate control means subsequent to energization of the second rate control means after the signal detection means has ceased indicating the detection of a signal.
Claim 4
Dependent Claim
79 words
A scan voltage generator as in claim 2 wherein the receiver includes a variable bandwidth filter and selection means for selecting the bandwidth of the bandwidth filter and the scan voltage generator includes comparator means connected to the selection means and the logic control means for energizing the reversing means to cause the ramp generator means to reverse the direction of the voltage ramp for a preselected period of time dependent on the bandwidth selected by the selection means.
Claim 5
Dependent Claim
53 words
A scan voltage generator as in claim 3 wherein the comparator means is also connected to the logic means for energizing the second rate control means subsequent to the energization of the reversing means until the voltage ramp has attained a value greater than the value at which the reversing means was energized.
Claim 6
Dependent Claim
57 words
A scan voltage generator as in claim 4 including a delay means connected to the selection means and the logic control means for delaying the energization of the second rate control means after energization of the reversing means for the preselected period of time, the delay period being dependent on the bandwidth selected by the selection means.
Claim 7
Dependent Claim
110 words
A scan voltage generator as in claim 5 wherein the ramp generator means comprises an integrator, a first voltage source, and a plurality of resistors; the first rate control means comprises switching means for connecting first selected ones of the plurality of resistors between the first voltage source and the integrator; and the second rate control means comprises switching means for connecting corresponding second selected ones of the plurality of resistors between the first voltage source and the integrator, wherein each of the first selected ones of the plurality of resistors is smaller than each of the corresponding second selected ones of the plurality of resistors by a preselected factor.
Claim 8
Dependent Claim
21 words
A scan voltage generator as in claim 6 wherein the preselected factor is in the range of 20 to 25 times.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |