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US3715509A
Expired / Lapsed
US
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Method and means for providing resolution level selection in a spectrum analyzer
Assignee: United States Department of the Air Force
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Filing: 1971-02-18
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Granted: 1973-02-06
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Expires: 1991-02-18
Abstract
Abstract Resolution level selection in a spectrum analyzer is provided by digitizing the IF analog input signal at a controllable rate, storing it in a digital memory device, and reading out the stored digital signal at an increased rate into a digital-to-analog converter. The resolution level is determined by the relationship between the digitizing rate and the memory read out rate.
Inventors
- 👤 E Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:37
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A circuit for varying resolution levels comprising, an analog-to-digital converter adapted to digitize at various rates an analog input signal, a digital memory device adapted to store signals digitized by said analog-to-digital converter, a digital-to-analog converter adapted to convert the output of said digital memory device into an analog output signal, and control means adapted to effect analog-to-digital converter digitization at discrete intervals and at a given rate and memory device read out at a substantially higher rate than said analog-to-digital converter digitization rate, means for down converting in frequency said analog input signal, a band pass filter connected between said means for down converting and said analog to digital converter, means for up converting in frequency said analog output signal, a second band pass filter connected between the output of said digital to analog converter and said means for up converting, a spectrum analyzer connected to the output of said means for up converting.
Claim 2
Dependent Claim
155 words
A circuit for varying resolution levels comprising, an analog-to-digital converter adapted to digitize at various rates an analog input signal, a digital memory device adapted to store signals digitized by said analog-to-digital converter, a digital-to-analog converter adapted to convert the output of said digital memory device into an analog output signal, and control means adapted to effect analog-to-digital converter digitization at discrete intervals and at a given rate and memory device read out at a substantially higher rate than said analog-to-digital converter digitization rate, means for down converting in frequency said analog input signal, a band pass filter connected between said means for down converting and said analog to digital converter, means for up converting in frequency said analog output signal, a second band pass filter connected between the output of said digital to analog converter and said means for up converting, a spectrum analyzer connected to the output of said means for up converting.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |