US4251815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal-envelope display system for a digital oscilloscope
Assignee: Tektronix Inc
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Filing: 1979-09-18
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Granted: 1981-02-17
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Expires: 1999-09-18
Abstract
Abstract A signal-envelope display system for a digital oscilloscope includes a memory for storing minimum and maximum signal values in adjacent storage locations, an address counter for sequentially addressing the memory, and a control circuit for selecting the least significant bit of the address count signal arriving at the memory from the least significant bit of the address count signal, a fixed logical low, or a fixed logical high to there by select every address location of the memory, or only the even locations, or only the odd locations over a given count cycle. The values retrieved from memory are converted to analog values and a vector generator connects the analog values to provide connected minimum and maximum values, connected maximum values, and connected minimum values for display. A signal-envelope display is provided by superposing the three displays.
Inventors
- 👤 Thomas P. Dagostino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
8 words
A display system for a digital oscilloscope, comprising:
Claim 2
Dependent Claim
8 words
A display system for a digital oscilloscope, comprising:
Claim 3
Dependent Claim
42 words
a waveform memory for storing minimum and maximum signal amplitude values in adjacent addressable storage locations. means for addressing said memory to selectively retrieve said minimum and maximum values; and means responsive to said retreived values for providing a display signal therefrom.
Claim 4
Dependent Claim
42 words
a waveform memory for storing minimum and maximum signal amplitude values in adjacent addressable storage locations. means for addressing said memory to selectively retrieve said minimum and maximum values; and means responsive to said retreived values for providing a display signal therefrom.
Claim 5
Dependent Claim
50 words
A display system in accordance with claim 1 wherein said means for addressing said memory comprises an address counter for providing a binary address count signal and control circuit means for controlling the least significant bit of said address count signal to thereby control address selection of said storage locations.
Claim 6
Dependent Claim
55 words
A display system in accordance with claim 2 wherein said control circuit means comprises switch means interposed between said address counter and said memory for selecting between a least significant bit of said binary address count signal, a fixed logical low, and a fixed logical high as the least significant bit applied to said memory.
Claim 7
Dependent Claim
35 words
A display system in accordance with claim 3 wherein said control circuit means further comprises a logic control circuit, and said switch means comprises a pair of NAND gates controllable by said logic control circuit.
Claim 8
Dependent Claim
24 words
A display system in accordance with claim 1 wherein said means for providing a display signal comprises a digital-to-analog converter and a vector generator.
Claim 9
Dependent Claim
69 words
A display system for a digital oscilloscope, comprising: a waveform memory containing minimum and maximum signal amplitude values representative of the envelope of a waveform; means for selectively retrieving the minimum values, the maximum values, or a combination of both minimum and maximum values; and means responsive to said retrieved values for regenerating minimum-value waveforms and maximum-value waveforms for superposition on a display device to provide an envelope display.
Claim 10
Dependent Claim
69 words
A display system for a digital oscilloscope, comprising: a waveform memory containing minimum and maximum signal amplitude values representative of the envelope of a waveform; means for selectively retrieving the minimum values, the maximum values, or a combination of both minimum and maximum values; and means responsive to said retrieved values for regenerating minimum-value waveforms and maximum-value waveforms for superposition on a display device to provide an envelope display.
Claim 11
Dependent Claim
38 words
A display system in accordance with claim 6 wherein said retrieving means comprises an address counter for producing a binary address count signal, and means for controlling the condition of the least significant bit of said count signal.
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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |