US3768093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital crt system for displaying a precessing waveform and its derivative
Assignee: American Optical Corp
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Filing: 1972-04-21
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Granted: 1973-10-23
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Expires: 1992-04-21
Abstract
Abstract A system for displaying the derivative of a waveform together with the waveform. Successive digital samples of the waveform are circulated with each sample controlling a dot display during a respective vertical trace. As new samples are taken and stored in the circulating register which contains a number of stages greater than the number of vertical sweeps in each frame, the waveform appears to move from right to left across the screen. Because samples of the original waveform are taken at a fixed rate, samples of its derivative can be derived by subtracting successive samples from each other. The derivative samples are formed as the original samples are shifted out of the circulating register prior to the vertical sweeps.
Inventors
- 👤 C Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:11
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34; G01R13/345; A; A61; A61B; A61B5/00; A61B5/72; A61B5/7235; A61B5/7239; A61B5/74; A61B5/742; A61B5/743; G01R13/28
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
158 words
A system for displaying a continuous signal waveform and its derivative waveform comprising means for storing successive digital samples of said digital waveform, means for reading out from said storing means time-successive digital samples of said signal waveform, first means for forming a raster display and for controlling the formation of a dot at a point along each vertical sweep of the display in a manner that creates a continuous visual effect and whose position is dependent upon the magnitude of a respective digital sample read out from said storing means, means for deriving the difference between time-successive digital samples read out from said storing means, second means for controlling the formation of another dot at a point along each vertical sweep of said display whose position is dependent upon the magnitude of said difference, and means for inverting the most significant bit of each difference digital value prior to an operation thereupon by said second controlling means.
Claim 2
Independent Claim
158 words
A system for displaying a continuous signal waveform and its derivative waveform comprising means for storing successive digital samples of said digital waveform, means for reading out from said storing means time-successive digital samples of said signal waveform, first means for forming a raster display and for controlling the formation of a dot at a point along each vertical sweep of the display in a manner that creates a continuous visual effect and whose position is dependent upon the magnitude of a respective digital sample read out from said storing means, means for deriving the difference between time-successive digital samples read out from said storing means, second means for controlling the formation of another dot at a point along each vertical sweep of said display whose position is dependent upon the magnitude of said difference, and means for inverting the most significant bit of each difference digital value prior to an operation thereupon by said second controlling means.
Claim 3
Dependent Claim
75 words
A system in accordance with claim 1 wherein digital samples are read out from said storing means during successive vertical sweep cycles of said display means, and each digital sample is read out from said storing means a number of times and at a rate which is slower than the horizontal sweep cycle of said display means so that the signal waveform and the derivative waveform which are displayed on said display means precess thereacross.
Claim 4
Dependent Claim
54 words
A system in accordance with claim 2 further including means for changing the rate at which each digital sample is read out from said storing means to equal the horizontal sweep rate of said display means so that the signal waveform and the derivative waveform which are Displayed on said display means remain stationary.
Claim 5
Dependent Claim
69 words
A system in accordance with claim 2 wherein said storing means includes shift register means having a number of stages greater than the number of vertical sweep cycles which take place during each horizontal sweep cycle, each of said stages containing a digital sample therein with the digital samples shifted out of said shift register means being used to form the dots along the vertical sweeps of said display.
Claim 6
Dependent Claim
48 words
A system in accordance with claim 4 further including means for converting the instantaneous magnitude of said signal waveform to a digital sample, and means for operating periodically said converting means and for replacing an old digital sample in said storing means by the most recent digital sample.
Claim 7
Dependent Claim
98 words
A system in accordance with claim 5 wherein said first and second means for controlling the formation of dots at points along a vertical sweep each includes means for forming a dot in said raster display a distance measured away from a horizontal reference line which is proportional to the digital value of a digital sample or the difference between successive digital samples, and further including means for shifting a digital value prior to the operation of said first or second controlling means thereupon for changing the scale factor of a displayed waveform by a factor of two.
Claim 8
Dependent Claim
68 words
A system in accordance with claim 1 wherein said storing means includes shift register means having a number of stages greater than the number of vertical sweep cycles which take place during each horizontal sweep cycle, each of said stages containing a digital sample therein with the digital samples shifted out of said shift register means being used to form dots along the vertical sweeps of said display.
Claim 9
Dependent Claim
48 words
A system in accordance with claim 7 further including means for converting the instantaneous magnitude of said signal waveform to a digital sample, and means for operating periodically said converting means and for replacing an old digital sample in said storing means by the most recent digital sample.
Claim 10
Dependent Claim
98 words
A system in accordance with claim 7 wherein said first and second means for controlling the formation of dots at points along a vertical sweep each includes means for forming a dot in said raster display a distance measured away from a horizontal reference line which is proportional to the digital value of a digital sample or the difference between successive digital samples, and further including means for shifting a digital value prior to the operation of said first or second controlling means thereupon for changing the scale factor of a displayed waveform by a factor of two.
Claim 11
Dependent Claim
48 words
A system in accordance with claim 1 further including means for converting the instantaneous magnitude of said signal waveform to a digital sample, and means for operating periodically said converting means and for replacing an old digital sample in said storing means by the most recent digital sample.
Claim 12
Dependent Claim
98 words
A system in accordance with claim 1 wherein said first and second means for controlling the formation of dots at points along a vertical sweep each includes means for forming a dot in said raster display a distance measured away from a horizontal reference line which is proportional to the digital value of a digital sample or the difference between successive digital samples, and further including means for shifting a digital value prior to the operation of said first or second controlling means thereupon for changing the scale factor of a displayed waveform by a factor of two.
Claim 13
Dependent Claim
18 words
A system in accordance with claim 1 wherein said deriving means derives the digital value of each difference.
Claim 14
Independent Claim
119 words
A system for displaying the derivative waveform of a continuous signal comprising means for storing successive digital samples of said signal, means for reading out from said storing means at a fixed rate time-successive digital samples of said signal, means for deriving the difference between time-successive digital samples read oUt from said storing means, means for forming a raster display and for controlling the formation of a dot at a point along each vertical sweep of said display in a manner that creates a continuous visual effect whose position is dependent upon the magnitude of a respective difference, and means for inverting the most significant bit of each digital value prior to an operation thereupon by said controlling means.
Claim 15
Independent Claim
119 words
A system for displaying the derivative waveform of a continuous signal comprising means for storing successive digital samples of said signal, means for reading out from said storing means at a fixed rate time-successive digital samples of said signal, means for deriving the difference between time-successive digital samples read oUt from said storing means, means for forming a raster display and for controlling the formation of a dot at a point along each vertical sweep of said display in a manner that creates a continuous visual effect whose position is dependent upon the magnitude of a respective difference, and means for inverting the most significant bit of each digital value prior to an operation thereupon by said controlling means.
Claim 16
Dependent Claim
71 words
A system in accordance with claim 13 wherein digital samples are read out from said storing means during successive vertical sweep cycles of said display means, and each digital sample is read out from said storing means a number of times and at a rate which is slower than the horizontal sweep cycle of said display means so that the derivative waveform which is displayed on said display means precesses thereacross.
Claim 17
Dependent Claim
50 words
A system in accordance with claim 14 further including means for changing the rate at which each digital sample is read out from said storing means to equal the horizontal sweep rate of said display means so that the derivative waveform which is displayed on said display means remains stationary.
Claim 18
Dependent Claim
68 words
A system in accordance with claim 13 wherein said storing means includes shift register means having a number of stages greater than the number of vertical sweep cycles which take place during each horizontal sweep cycle, each of said stages containing a digital sample therein with successive digital samples shifted out of said shift register means being used to form successive differences operated upon by said controlling means.
Claim 19
Dependent Claim
47 words
A system in accordance with claim 16 further including means for converting the instantaneous magnitude of a signal to a digital sample, and means for operating periodically said converting means and for replacing an old digital sample in said storing means by the most recent digital sample.
Claim 20
Dependent Claim
47 words
A system in accordance with claim 13 further including means for converting the instantaneous magnitude of a signal to a digital sample, and means for operating periodically said converting means and for replacing an old digital sample in said storing means by the most recent digital sample.
Claim 21
Dependent Claim
89 words
A system in accordance with claim 13 wherein said means for controlling the formation of a dot at a point along a vertical sweep includes means for forming a dot in said raster display a distance measured away from a horizontal reference line which is proportional to the digital value of the difference between successive digital samples, and further including means for shifting a digital value prior to the operation of said controlling means thereupon for changing the scale factor of the displayed waveform by a factor of two.
Claim 22
Dependent Claim
18 words
A system in accordance with claim 13 wherein said deriving means derives the digital value of each difference.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |