US3699949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse jitter measurement especially for heart beat measurement
Assignee: HUMAN FACTORS RESEARCH Inc
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Filing: 1971-07-26
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Granted: 1972-10-24
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Expires: 1991-07-26
Abstract
Abstract Apparatus for measuring the difference in intervals between pulses of a pulse train and providing a continuous output indicative of the interval variation or the pulse jitter. Circuitry having the pulse train as an input and including a pair of interval timers, for producing a series of constant width pulses related to the input pulses in amplitude and repetition rate. An averager and a difference amplifier for providing an output which is a function of the difference between each pulse interval and the average pulse interval.
Inventors
- 👤 James F O'hanlon Jr
- 👤 Glenn A Sanderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:33
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/024; A61B5/0245
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
In an apparatus for measuring the difference in intervals between pulses of a pulse train, the combination of: first circuit means having the pulse train as an input for producing a series of constant width pulses, with a constant width pulse for each pulse of the input pulse train and with the amplitude of the constant width pulses proportional to the time intervals between the input pulses; a first averager having said series of constant width pulses as an input and producing a time-weighted average of said constant width pulses as a first averager output; and a difference amplifier having said series of constant width pulses and said first averager output as inputs and providing an output which is the difference of the inputs thereto, with said output corresponding to the instantaneous variations in the intervals between pulses of the input pulse train.
Claim 2
Dependent Claim
143 words
In an apparatus for measuring the difference in intervals between pulses of a pulse train, the combination of: first circuit means having the pulse train as an input for producing a series of constant width pulses, with a constant width pulse for each pulse of the input pulse train and with the amplitude of the constant width pulses proportional to the time intervals between the input pulses; a first averager having said series of constant width pulses as an input and producing a time-weighted average of said constant width pulses as a first averager output; and a difference amplifier having said series of constant width pulses and said first averager output as inputs and providing an output which is the difference of the inputs thereto, with said output corresponding to the instantaneous variations in the intervals between pulses of the input pulse train.
Claim 3
Dependent Claim
35 words
An apparatus as defined in claim 1 including an absolute value amplifier having the output of said difference amplifier as an input and providing an output which is the absolute value of the input thereto.
Claim 4
Dependent Claim
32 words
An apparatus as defined in claim 2 including means for coupling the output of said absolute value amplifier to an output circuit at the time of each of said constant width pulses.
Claim 5
Dependent Claim
34 words
An apparatus as defined in claim 3 including a second averager having the output of said absolute value amplifier as an input and producing a time-weighted average of said absolute values as an output.
Claim 6
Dependent Claim
73 words
An apparatus as defined in claim 3 in which said first circuit means includes: first and second interval timers for generating output voltages proportional to the duration of an input interval; means for starting, stopping, and resetting each of said interval timers in sequence in response to successive pulses of the input pulse train; and means for combining the output voltages of said interval timers to produce said series of constant width pulses.
Claim 7
Dependent Claim
114 words
An apparatus as defined in claim 5 in which said means for starting, stopping, and resetting includes: means for generating in sequence first and second enable signals of durations corresponding to the intervals between the input pulses; means for connecting said first and second enable signals to said first and second interval timers, respectively, for defining said input intervals; means for generating in sequence first and second strobe signals of constant width and at times corresponding to the times of the input pulses; and means for connectinG said first and second strobe signals to said first and second interval timers, respectively, for providing an interval timer output voltage after an enable signal goes off.
Claim 8
Dependent Claim
24 words
An apparatus as defined in claim 6 including means for actuating said means for coupling in synchronism with said first and second strobe signals.
Claim 9
Dependent Claim
31 words
An apparatus as defined in claim 1 including heartbeat sensing transducers for picking up varying heartbeat signals from a patient, and means for amplifying said signals to provide the pulse train.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |