Patent US4510571A successfully refreshed from Google Patents.
US4510571A
Expired / Lapsed
US
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Waveform storage and display system
Assignee: Tektronix Inc
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Filing: 1981-10-08
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Granted: 1985-04-09
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Expires: 2001-10-08
Abstract
Abstract A waveform storage and display system particularly useful in digital oscilloscopes is provided in which successive waveforms of a repetitive signal are compared with a reference waveform, and upon detection of a difference or change within the waveform, the changed waveform is automatically stored. In addition to the conventional acquisition and display waveform memories, a reference-waveform and a changed-waveform memories are provided. Once a reference waveform is selected and stored, comparison of subsequent successive waveforms to detect changes is achieved under microprocessor control. Several display modes to provide a visual indication of changes may be implemented.
Inventors
- 👤 Thomas P. Dagostino
- 👤 John D. Trudel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:18
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34; G01R13/345
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A method of storing and displaying waveforms comprising the steps of: receiving electrical signals and converting said signals to digital representations thereof to provide acquired waveforms; storing a first acquired waveform as a reference in a reference waveform memory; storing subsequently-acquired waveforms in an acquisition memory; electronically comparing by comparison logic means said subsequently-acquired waveforms with said reference waveform and detecting a changed waveform with respect to said reference waveform; and storing said changed waveform in a third waveform memory automatically upon said detection, wherein any of said memories may be coupled to a display system to display the contents thereof.
Claim 2
Independent Claim
101 words
A method of storing and displaying waveforms comprising the steps of: receiving electrical signals and converting said signals to digital representations thereof to provide acquired waveforms; storing a first acquired waveform as a reference in a reference waveform memory; storing subsequently-acquired waveforms in an acquisition memory; electronically comparing by comparison logic means said subsequently-acquired waveforms with said reference waveform and detecting a changed waveform with respect to said reference waveform; and storing said changed waveform in a third waveform memory automatically upon said detection, wherein any of said memories may be coupled to a display system to display the contents thereof.
Claim 3
Dependent Claim
21 words
A method in accordance with claim 1 further comprising the step of providing a visual indication that a change has occurred.
Claim 4
Dependent Claim
32 words
A method in accordance with claim 2 wherein said step of providing a visual indication comprises displaying said changed waveform with the portion thereof that differs from the reference waveform being intensified.
Claim 5
Dependent Claim
84 words
A waveform storage and display system, comprising: means for receiving electrical signals and converting said signals to digital representations thereof to provide acquired waveforms; a first waveform memory for storing a first acquired waveform as a reference waveform; a second waveform memory for storing subsequently-acquired waveforms; means for electronically comparing said subsequently-acquired waveforms with said reference waveform and detecting a changed waveform with respect to said reference waveform; and means for storing said changed waveform in a third waveform memory automatically upon said detection.
Claim 6
Dependent Claim
84 words
A waveform storage and display system, comprising: means for receiving electrical signals and converting said signals to digital representations thereof to provide acquired waveforms; a first waveform memory for storing a first acquired waveform as a reference waveform; a second waveform memory for storing subsequently-acquired waveforms; means for electronically comparing said subsequently-acquired waveforms with said reference waveform and detecting a changed waveform with respect to said reference waveform; and means for storing said changed waveform in a third waveform memory automatically upon said detection.
Claim 7
Dependent Claim
20 words
A system in accordance with claim 4 further comprising means for providing a visual indication that a change has occurred.
Claim 8
Dependent Claim
28 words
A system in accordance with claim 5 wherein said visual indication means comprises a display device capable of displaying the changed waveform in relation to the reference waveform.
Claim 9
Dependent Claim
21 words
A system in accordance with claim 4 wherein said comparison means includes means for establishing permissible deviation from said reference waveform.
Claim 10
Dependent Claim
25 words
A system in accordance with claim 4 further comprising means for storing information identifying locations along the changed waveform that differ from the reference waveform.
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |