US3760100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio electrocardiogram monitor
Assignee: United States Department of the Army
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Filing: 1971-07-30
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Granted: 1973-09-18
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Expires: 1991-07-30
Abstract
Abstract The audio monitor disclosed herein is an electronic device which converts the electrocardiogram into an amplitude and frequency modulated tone. This allows the listener to evaluate the shape of an electrocardiogram merely by listening. This is achieved by converting ECG potentials into an amplitude and frequency modulated tone. The tone increases with frequency and becomes louder as the ECG pattern goes positive, and the tone decreases in frequency while becoming louder as the ECG pattern goes negative.
Inventors
- 👤 C Ragsdale
- 👤 E Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:25
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/74; A61B5/7405; A61B5/7415
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
248 words
A voltage to sound conversion monitor comprising: a band pass preamplifier having electrical voltage signals connected at the input thereof; a voltage controlled oscillator connected to the output of the preamplifier, the output of the voltage controlled oscillator being frequency modulated in accordance with the amplitude of said electrical voltage signals; a frequency divider connected at its input to the output of the oscillator for assuring that the frequency modulated output of said voltage controlled oscillator has a constant duty cycle; driver means connected between the output of the frequency divider and a junction point for clamping the junction point to preselected potential when the input to the driver exceeds a preselected voltage threshold; a full-wave rectifier having its input connected to the output of the preamplifier for rectifying the signals appearing thereat; an amplitude modulation resistor connected between the rectifier and the junction point for amplitude modulating the frequency modulated output of the voltage controlled oscillator in response to periodic clamping of the junction point by the driver means; an electroacoustical transducer connected to the junction point for responding to the amplitude and frequency modulated signal thereat for converting the signal into an acoustical tone; a use-adjust switch connected between the preamplifier and the voltage controlled oscillator, the switch being initially set in the adjust position; a Schmitt trigger connected across the switch; and manual gain adjust means connected to the preamplifier for indicating the amplitude of said electrical voltage signals directly, after proper manual gain adjustment.
Claim 2
Dependent Claim
248 words
A voltage to sound conversion monitor comprising: a band pass preamplifier having electrical voltage signals connected at the input thereof; a voltage controlled oscillator connected to the output of the preamplifier, the output of the voltage controlled oscillator being frequency modulated in accordance with the amplitude of said electrical voltage signals; a frequency divider connected at its input to the output of the oscillator for assuring that the frequency modulated output of said voltage controlled oscillator has a constant duty cycle; driver means connected between the output of the frequency divider and a junction point for clamping the junction point to preselected potential when the input to the driver exceeds a preselected voltage threshold; a full-wave rectifier having its input connected to the output of the preamplifier for rectifying the signals appearing thereat; an amplitude modulation resistor connected between the rectifier and the junction point for amplitude modulating the frequency modulated output of the voltage controlled oscillator in response to periodic clamping of the junction point by the driver means; an electroacoustical transducer connected to the junction point for responding to the amplitude and frequency modulated signal thereat for converting the signal into an acoustical tone; a use-adjust switch connected between the preamplifier and the voltage controlled oscillator, the switch being initially set in the adjust position; a Schmitt trigger connected across the switch; and manual gain adjust means connected to the preamplifier for indicating the amplitude of said electrical voltage signals directly, after proper manual gain adjustment.
Claim 3
Dependent Claim
38 words
A voltage to sound conversion monitor as in claim 1, further including a polarity switch connecting the voltage signals to the preamplifier for allowing the polarity of said electrical voltage signals to be adjusted for maximum preamplifier output.
Claim 4
Dependent Claim
17 words
A voltage to sound conversion monitor as in claim 2, wherein said electroacoustical transducer is a speaker.
Claim 5
Dependent Claim
19 words
A voltage to sound conversion monitor as in claim 2, wherein said electroacoustical transducer is a pair of headphones.
Claim 6
Dependent Claim
46 words
A voltage to sound conversion monitor as in claim 4, including a low-pass filter connected to the input of the transducer for filtering said amplitude and frequency modulated tone in order to remove the fast rise time portions thereof in order to provide a clear tone.
References Cited (Backward Citations)
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |