US4253152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrum analyzer with parameter updating from a display marker
Assignee: HP Inc
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Filing: 1978-08-10
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Granted: 1981-02-24
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Expires: 1998-08-10
Abstract
Abstract An input signal is mixed with sampling signals from oscillators which vary the frequency of the sampling signal from a first frequency to a second frequency. The resulting Intermediate Frequency (IF) signal is processed and digital values are stored in a memory in response thereto. Waveforms are then displayed which correspond to these frequency and amplitude values. Various input and display circuits facilitate the display and interpretation of these waveforms.
Inventors
- 👤 Steven N. Holdaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:31
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
339 words
Apparatus for use in the spectrum analysis of a signal, said apparatus comprising: input means having inputs for receiving an input signal and a sampling signal for providing an intermediate frequency signal in response to said input signal and said sampling signal; signal processing means coupled to said input means for providing a first digital signal in response to said intermediate frequency signal; memory means coupled to said signal processing means for storing electrical representations of said digital signal in response to a memory control signal; memory control means coupled to said memory means for providing said memory control signal; display means coupled to said memory means for providing a waveform display in response to display control signals and said electrical representations, said waveform display representing amplitude levels at frequencies between a frequency span between a first frequency and a second frequency, said frequency in the middle of between said first frequency and said second frequency being the center frequency; display control means coupled to said display means for providing said display control signals in response to operator control signals, said display control means including means for causing said display means to include a first visual indication at a first predetermined position on said waveform display in response to a first marker control signal; logic means for causing the waveform display to be altered in response to the position of said first visual indication and a first logic control signal; and operator controls coupled to said display control means for providing said operator control signals and including means for providing said first marker control signal in response to first operator manifestations indicating it is desired to include a first visual indication with said waveform display; means for changing the position of said first visual indication in response to operator manifestations indicating a desired position for said visual indication; and means for providing a first logic signal in response to operator manifestations indicating that it is desired to use the position of said visual indication to alter the waveform display.
Claim 2
Dependent Claim
339 words
Apparatus for use in the spectrum analysis of a signal, said apparatus comprising: input means having inputs for receiving an input signal and a sampling signal for providing an intermediate frequency signal in response to said input signal and said sampling signal; signal processing means coupled to said input means for providing a first digital signal in response to said intermediate frequency signal; memory means coupled to said signal processing means for storing electrical representations of said digital signal in response to a memory control signal; memory control means coupled to said memory means for providing said memory control signal; display means coupled to said memory means for providing a waveform display in response to display control signals and said electrical representations, said waveform display representing amplitude levels at frequencies between a frequency span between a first frequency and a second frequency, said frequency in the middle of between said first frequency and said second frequency being the center frequency; display control means coupled to said display means for providing said display control signals in response to operator control signals, said display control means including means for causing said display means to include a first visual indication at a first predetermined position on said waveform display in response to a first marker control signal; logic means for causing the waveform display to be altered in response to the position of said first visual indication and a first logic control signal; and operator controls coupled to said display control means for providing said operator control signals and including means for providing said first marker control signal in response to first operator manifestations indicating it is desired to include a first visual indication with said waveform display; means for changing the position of said first visual indication in response to operator manifestations indicating a desired position for said visual indication; and means for providing a first logic signal in response to operator manifestations indicating that it is desired to use the position of said visual indication to alter the waveform display.
Claim 3
Dependent Claim
31 words
The apparatus as in claim 1 wherein said logic means includes means for causing the frequency at the position of said marker to become the center frequency for said display waveform.
Claim 4
Dependent Claim
70 words
The apparatus as in claim 1 wherein said operator controls further include means for providing a second marker control signal in response to operator manifestations indicating that a second marker is to be placed at a second predetermined position on said waveform display; and said display control means includes means for causing said display means to include a second visual indication at a second predetermined position on said waveform display.
Claim 5
Dependent Claim
37 words
The apparatus as in claim 3 wherein said display control means further includes means for determining the difference in frequency values between the position of said first visual indication and the position of said second visual indication.
Claim 6
Dependent Claim
38 words
The apparatus as in claim 4 wherein said logic means includes means for causing said display waveform to be altered in response to the difference in frequency values between the positions of said first and second visual indications.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |