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US3710174A
Expired / Lapsed
US
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Intensity modulated teardrop display for a vectorcardiograph
Assignee: Individual
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Filing: 1971-03-05
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Granted: 1973-01-09
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Expires: 1991-03-05
Abstract
Abstract In a vectorcardiograph system, the vector loops are displayed as a plurality of teardrop-shaped dashes. The dashes are produced by modulating the beam of a cathode ray tube in response to the voltage developed across a charging capacitor. The charging rate of the capacitor is controlled by a current gate responsive to the velocity of the horizontal and vertical signals applied to the cathode ray tube. A pulse generator controls a gate to periodically discharge the capacitor, thereby to terminate one teardrop-shaped dash and begin another.
Inventors
- 👤 J Cerniglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:02
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/26; A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/339; A61B5/341; A61B5/72; A61B5/7235; A61B5/7239
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
In a vectorcardiograph system, a circuit for controlling a cathode ray tube to indicate the directions of displayed vectorcardiograph signals by a plurality of teardrop-shaped dashes, the circuit comprising: means for receiving and differentiating each of said horizontal and vertical beam deflection signals applied to said cathode ray tube to produce a velocity signal output; a capacitor; means for charging said capacitor at a rate determined in response to the magnitude of the velocity signal output from said receiving and differentiating means; means coupled to said capacitor for periodically discharging said capacitor at a rate substantially greater than the charging rate of said capacitor; and means for amplifying the voltage developed across said capacitor, said amplifying means having an output coupled to the beam intensity control grid of said cathode ray tube.
Claim 2
Dependent Claim
132 words
In a vectorcardiograph system, a circuit for controlling a cathode ray tube to indicate the directions of displayed vectorcardiograph signals by a plurality of teardrop-shaped dashes, the circuit comprising: means for receiving and differentiating each of said horizontal and vertical beam deflection signals applied to said cathode ray tube to produce a velocity signal output; a capacitor; means for charging said capacitor at a rate determined in response to the magnitude of the velocity signal output from said receiving and differentiating means; means coupled to said capacitor for periodically discharging said capacitor at a rate substantially greater than the charging rate of said capacitor; and means for amplifying the voltage developed across said capacitor, said amplifying means having an output coupled to the beam intensity control grid of said cathode ray tube.
Claim 3
Dependent Claim
40 words
The circuit of claim 1, wherein said capacitor charging means includes: a source of current; and variable current gating means coupled between said current source and said capacitor, said gating Means having a control electrode responsive to said velocity signal.
Claim 4
Dependent Claim
46 words
The circuit of claim 2, wherein said receiving and differentiating means includes: means for full wave rectifying each of the differentiated horizontal and vertical deflection signals; and means for coupling the outputs of said full wave rectifying means in parallel to produce said velocity signal output.
Claim 5
Dependent Claim
31 words
The circuit of claim 3, further including amplifying means coupled between the velocity signal output of said receiving and differentiating means and the control electrode of said variable current gating means.
Claim 6
Dependent Claim
42 words
The circuit of claim 2, wherein said periodically discharging means includes: pulse generator means for periodically producing pulses at selected time intervals; and gating means coupled across said capacitor for conducting current in response to the pulses from said pulse generator means.
Claim 7
Dependent Claim
26 words
The circuit of claim 5, wherein said pulse generator means includes a ramp generator and a network for differentiating the ramp signal from said ramp generator.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |