Patent US3689879A successfully refreshed from Google Patents.
US3689879A
Expired / Lapsed
US
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Conservation of transient pulses in analog to digital conversion
Assignee: Baxter International Inc
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Filing: 1971-05-18
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Granted: 1972-09-05
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Expires: 1991-05-18
Abstract
Abstract A composite signal comprising an analog signal with transient pulses superimposed thereon is periodically sampled and each sample is converted to a digital value which is stored in a buffer register prior to transfer to a data processing unit. A special circuit comprising a differentiator and comparator continuously receives the composite signal, detects the transient pulses, and forces a value into the buffer register to represent each transient pulse, even though the pulse may occur during an interval when the composite signal is not being sampled by the normal analog to digital conversion circuit. The special circuit may include a counter which is preset to a value N so that the value representing a transient pulse may be forced into the buffer register during N successive cycles. This permits control of the width of the transient pulses when the digital data is reconverted to analog form.
Inventors
- 👤 Thomas H Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:23
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/72; A61B5/7235; A61B5/7239; H; H03; H03M; H03M1/00; H03M1/12; H03M1/124
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
A system for the analog to digital conversion of a composite signal comprising an analog signal having transient pulses superimposed thereon, said system comprising: means for periodically sampling said composite signal; an analog to digital coversion means responsive to said sampling means for producing a digital value representing the magnitude of the composite signal, said conversion means producing a digital value for each sample; storage means for storing each of said digital values; means continuously responsive to said composite signal for detecting said transient pulses; and, means responsive to said detector means for entering a predetermined digital value into said storage means in response to each transient pulse detected.
Claim 2
Independent Claim
109 words
A system for the analog to digital conversion of a composite signal comprising an analog signal having transient pulses superimposed thereon, said system comprising: means for periodically sampling said composite signal; an analog to digital coversion means responsive to said sampling means for producing a digital value representing the magnitude of the composite signal, said conversion means producing a digital value for each sample; storage means for storing each of said digital values; means continuously responsive to said composite signal for detecting said transient pulses; and, means responsive to said detector means for entering a predetermined digital value into said storage means in response to each transient pulse detected.
Claim 3
Dependent Claim
35 words
A system as claimed in claim 1 wherein said means for entering a predetermined digital value includes means for repeatedly entering said predetermined value into said storage means in response to each transient pulse detected.
Claim 4
Dependent Claim
88 words
A system as claimed in claim 1 wherein said means for entering a predetermined digital value comprises: a counter; means responsive to said detection means for entering a predetermined count into said counter in response to each detected pUlse; means for cyclically clearing said storage means and modifying the count in said counter; and, means responsive to said counter for cyclically entering a predetermined digital value into said storage means after it has been reset, if the modified count in said counter is not a second predetermined count.
Claim 5
Dependent Claim
66 words
A system as claimed in claim 1 wherein said means for detecting transient pulses comprises differentiator circuit means for providing an output signal whose magnitude is dependent on the rate of change in the magnitude of said composite signal, and amplitude discriminator means responsive to said differentiator circuit output signal for producing an output pulse when the magnitude of said output signal exceeds a selected magnitude.
Claim 6
Dependent Claim
96 words
A system as claimed in claim 4 wherein said means for entering a predetermined digital value comprises: a counter, means connecting said amplitude discriminator means to said counter to enter a predetermined count into said counter in response to each output pulse from said amplitude discriminator means; means for cyclically clearing said storage means and modifying the count in said counter; and, means responsive to said counter for cyclically entering a predetermined digital value into said storage means after it has been reset, if the modified count in said counter is not a second predetermined count.
Claim 7
Dependent Claim
20 words
A system as claimed in claim 5 wherein said composite signal comprises an EKG signal with pacemaker pulses superimposed thereon.
Claim 8
Dependent Claim
80 words
An analog to digital conversion system for producing a sequence of digital signals representing an analog signal and transient pulses associated therewith, said system comprising: first means for periodically sampling said analog signal; an analog to digital converter responsive to said sampling means for producing digital signals representing the magnitude of the sampled analog signal; register means for storing said digital signal; and, means responsive to said transient pulses for entering a predetermined combination of signals into said register means.
Claim 9
Dependent Claim
80 words
An analog to digital conversion system for producing a sequence of digital signals representing an analog signal and transient pulses associated therewith, said system comprising: first means for periodically sampling said analog signal; an analog to digital converter responsive to said sampling means for producing digital signals representing the magnitude of the sampled analog signal; register means for storing said digital signal; and, means responsive to said transient pulses for entering a predetermined combination of signals into said register means.
Claim 10
Dependent Claim
41 words
A system as claimed in claim 7 wherein said means for entering signals into said register means comprises means for repeatedly entering the same predetermined combination of signals into said register means in response to each one of said transient pulses.
Claim 11
Dependent Claim
144 words
A system as claimed in claim 7 wherein said means responsive to transient pulses comprises: differentiator circuit means for providing an output signal whose magnitude is dependent on the rate of change in the magnitude of said transient pulses, amplitude discriminator means responsive to said differentiator circuit output signal for producing an output pulse when the magnitude of said output signal exceeds a selected magnitude; a counter, means connecting said amplitude discriminator means to said counter to enter a predetermined count into said counter in response to each output pulse from said amplitude discriminator means; means for cyclically clearing said storage means and modifying the count in said counter; and, means responsive to said counter for cyclically entering a predetermined digital value into said storage means after it has been reset, if the modified count in said counter is not a second predetermined count.
Claim 12
Dependent Claim
17 words
A system as claimed in claim 9 wherein said transient pulses are superimposed on said analog 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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |