US3653027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precessing analog trace display
Assignee: Honeywell Inc
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Filing: 1970-06-15
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Granted: 1972-03-28
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Expires: 1990-06-15
Abstract
Abstract A signal display circuit includes an analog to digital converter, a recirculating memory, a digital to analog converter, and a CRT display means. The memory and the display means are synchronized so that a bright spot representative of the information contained in one location of the memory is produced on the display means for each shifting of information in the memory. New information replaces existing information in the memory at a rate less than the shifting rate of the memory so that the displayed signal appears to move across the viewing screen at a variable speed and with a constant brightness. When no new information is fed into the memory, the display means will continue to show the position of the signal as represented by the data stored in the memory.
Inventors
- 👤 David W Scheer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32; G01R13/04; G01R13/06; H; H03; H03M; H03M1/00; H03M1/12; H03M1/50; H03M1/66; H03M1/74
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
372 words
A signal display system comprising: a cathode ray tube having a phosphor screen and means for forming a single scanning electron beam; means for generating a first sweep signal to effect a sweeping of said beam across the face of said tube in a first direction at a relatively high first scanning rate; means for generating a second sweep signal to effect the sweeping of said beam in a second direction substantially perpendicular to said first direction and at a second scanning rate substantially lower than said fist scanning rate; beam intensity control means for controlling the intensity level of said electron beam between a first intensity level less than that necessary to excite said phosphor screen to luminoscity, and a second intensity level sufficient to excite said phosphor screen to luminoscity; input signal means; first conversion means for converting an input signal from said input signal means into digital samples at a predetermined sampling rate; memory means operatively connected to said first conversion means for recirculating said digital samples; system control means operatively coupled to said first conversion means for introducing signals to said first conversion means determinative of said sampling rate; said system control means being further coupled to said memory means for introducing thereto a signal determinative of the rate of said recirculation, said recirculating rate being substantially greater than said sampling rate and substantially equal to said first scanning rate; said system control means being also coupled to said second sweep signal means for introducing thereto a signal determinative of the initiation of successive sweeps of said second sweep signal; second conversion means responsive to said memory means and operative to effect conversion of said digital samples to a corresponding analog output signal, said last mentioned conversion occurring at a rate substantially equal to said recirculation rate; comparator means operatively connected to said second conversion means and said first sweep signal means to produce a comparator output signal representative of a comparative equivalence of said analog output signal and a reference signal which varies directly with said first sweep signal and means for applying said comparator output signal to said beam intensity control means whereby to shift said beam intensity from said first level to said second level.
Claim 2
Dependent Claim
372 words
A signal display system comprising: a cathode ray tube having a phosphor screen and means for forming a single scanning electron beam; means for generating a first sweep signal to effect a sweeping of said beam across the face of said tube in a first direction at a relatively high first scanning rate; means for generating a second sweep signal to effect the sweeping of said beam in a second direction substantially perpendicular to said first direction and at a second scanning rate substantially lower than said fist scanning rate; beam intensity control means for controlling the intensity level of said electron beam between a first intensity level less than that necessary to excite said phosphor screen to luminoscity, and a second intensity level sufficient to excite said phosphor screen to luminoscity; input signal means; first conversion means for converting an input signal from said input signal means into digital samples at a predetermined sampling rate; memory means operatively connected to said first conversion means for recirculating said digital samples; system control means operatively coupled to said first conversion means for introducing signals to said first conversion means determinative of said sampling rate; said system control means being further coupled to said memory means for introducing thereto a signal determinative of the rate of said recirculation, said recirculating rate being substantially greater than said sampling rate and substantially equal to said first scanning rate; said system control means being also coupled to said second sweep signal means for introducing thereto a signal determinative of the initiation of successive sweeps of said second sweep signal; second conversion means responsive to said memory means and operative to effect conversion of said digital samples to a corresponding analog output signal, said last mentioned conversion occurring at a rate substantially equal to said recirculation rate; comparator means operatively connected to said second conversion means and said first sweep signal means to produce a comparator output signal representative of a comparative equivalence of said analog output signal and a reference signal which varies directly with said first sweep signal and means for applying said comparator output signal to said beam intensity control means whereby to shift said beam intensity from said first level to said second level.
Claim 3
Dependent Claim
72 words
The invention as set forth in claim 1 wherein said system control means further includes: first signal generating means operative to produce system reference signals; switching means; second signal generating means responsive to said switching means and said reference signals, to produce system timing signals, and means including said memory means responsive to said system timing signals for determining between a first and a second mode of operation of said display system.
Claim 4
Dependent Claim
53 words
The invention as set forth in claim 2 wherein said second signal generating means comprises gating means responsive to a first condition of said switching means for establishing a first time phase relationship between said system timing signals and said system reference signals whereby to effect a precessing display of said input signals.
Claim 5
Dependent Claim
58 words
The invention as set forth in claim 3 wherein said second signal generating means includes further gating means responsive to a second condiTion of said switching means for establishing a second time-phase relationship between said system timing signals and said system reference signals whereby to effect a continuously refreshed stationary display of a portion of said input signals.
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) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |