Patent US4006412A successfully refreshed from Google Patents.
US4006412A
Expired / Lapsed
US
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Digital display system circuit
Assignee: United States Department of the Navy
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Filing: 1974-10-29
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Granted: 1977-02-01
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Expires: 1994-10-29
Abstract
Abstract A digital display system is provided for visually indicating the amplitude of a received signal. A plurality of reference signals incrementally graduated from a low amplitude to a high amplitude is applied as first inputs to a polarity of comparators and the received signal as applied as the second input. The comparators produce an output of polarity commensurate with the instantaneous difference between its inputs and a plurality of series-connected light emitting means, each connected between the outputs of two adjacent comparators, is responsive to a predetermined electrical potential for generating light energy so that the instantaneous amplitude level of the received signal is visually indicated by the actuation of a single such light emitting means at a time.
Inventors
- 👤 Kenneth J. Campbell
- 👤 Douglas H. Mogle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:29
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/40; G01R13/404; G01R13/405; G01R13/406
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
178 words
A digital display system circuit for visually indicating the amplitude of a received signal comprising: a plurality of reference signals incrementally graduated from a low amplitude to a high amplitude; a plurality of comparators having first and second inputs, each of said comparators having its first input connected to a different one of said reference signals and its second input connected to said received signal for producing an output of fixed amplitude of one polarity when its second input exceeds its first input and producing an output of substantially the same fixed amplitude but of opposite polarity in response to lesser amplitudes of said second input; and a plurality of series connected light emitting means, each connected between the outputs of two adjacent comparators and responsive to the electrical potential developed by a difference of polarity therebetween for energizing one of said light emitting means indicating that the received signal has an amplitude within the range of the two incrementally graduated reference signals connected as first inputs to the two adjacent comparators developing said difference of polarity therebetween.
Claim 2
Dependent Claim
178 words
A digital display system circuit for visually indicating the amplitude of a received signal comprising: a plurality of reference signals incrementally graduated from a low amplitude to a high amplitude; a plurality of comparators having first and second inputs, each of said comparators having its first input connected to a different one of said reference signals and its second input connected to said received signal for producing an output of fixed amplitude of one polarity when its second input exceeds its first input and producing an output of substantially the same fixed amplitude but of opposite polarity in response to lesser amplitudes of said second input; and a plurality of series connected light emitting means, each connected between the outputs of two adjacent comparators and responsive to the electrical potential developed by a difference of polarity therebetween for energizing one of said light emitting means indicating that the received signal has an amplitude within the range of the two incrementally graduated reference signals connected as first inputs to the two adjacent comparators developing said difference of polarity therebetween.
Claim 3
Dependent Claim
22 words
A digital display system circuit as claimed in claim 1 including digital indicia visually aligned with said plurality of light emitting means.
Claim 4
Dependent Claim
28 words
A digital display system circuit as claimed in claim 1 wherein said plurality of reference signals comprises a source of electrical potential connected to multiple voltage divider means.
Claim 5
Dependent Claim
18 words
A digital display system circuit as claimed in claim 1 wherein said comparators comprise differential operational amplifier circuits.
Claim 6
Dependent Claim
19 words
A digital display system cirucit as claimed in claim 1 wherein said light emitting means comprises light emitting diodes.
Claim 7
Dependent Claim
26 words
A digital display system circuit as claimed in claim 5 and including current limiting resistive means connected in series with each of said light emitting diodes.
Claim 8
Dependent Claim
21 words
A digital system circuit as claimed in claim 1 and including a noise reduction circuit connected for stabilizing said received signal.
Claim 9
Dependent Claim
20 words
A digital display system circuit as claimed in claim 7 wherein said noise reduction circuit comprises a low pass filter.
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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |