US4967760A
Expired / Lapsed
US
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Dynamic spectral phonocardiograph
Assignee: Yale University
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Filing: 1989-02-02
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Granted: 1990-11-06
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Expires: 2009-02-02
Abstract
Abstract A system of generating a spectral phonocardiogram which summarizes time-dependent changes in the heart sounds throughout the heart cycle. The system is based on the projection of spectral surfaces of the Fourier transform of heart sounds as a function of time and is a useful diagnostic tool both for a cardiologist and a general practitioner. Permanent copies of the spectral phonocardiograms can provide useful records for monitoring the development of heart disease in a given individual. The system provides a useful means for rapid screening of large groups of people for heart disease by non-specialists in cardiology. A variant of the system provides automated computer diagnosis of the probable nature of the heart disease.
Inventors
- 👤 William R. Bennett, Jr.
- 👤 Jean Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:09
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; A61B7/04
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
68 words
A method of producing a dynamic spectral cardiogram for picking out irregular sound patterns at different portions of a heart cycle as a function of frequency, comprising steps of: a. producing real-time audio representation of a patient's heart sounds; and b. producing a three dimensional video display of the same heart sounds by generating projections of spectral surfaces of Fourier transforms of the heart sounds in real time.
Claim 2
Independent Claim
68 words
A method of producing a dynamic spectral cardiogram for picking out irregular sound patterns at different portions of a heart cycle as a function of frequency, comprising steps of: a. producing real-time audio representation of a patient's heart sounds; and b. producing a three dimensional video display of the same heart sounds by generating projections of spectral surfaces of Fourier transforms of the heart sounds in real time.
Claim 3
Dependent Claim
27 words
The method according to claim 1, wherein the real time audio representation is produced by placing at least one microphone in the vicinity of a patient's heart.
Claim 4
Dependent Claim
64 words
The method according to claim 1, wherein the video display is produced by placing at least one microphone in the vicinity of a patient's heart to produce analog output signals corresponding to heart sounds, converting the analog output signals of the microphone to digital signals, performing a fast Fourier transform on the digital signals, and displaying the transforms as spectral surfaces on a display.
Claim 5
Dependent Claim
77 words
The method according to claim 3, wherein the step of producing the video display further comprises applying an adjustable resolution time-window weighting function, F, over a time interval of duration, T, to the digital signals, wherein F is described by F=0.5[1-cos(Pi(t-T/2+W)/W)] for T/2-W<t<T/2+W and F=0 otherwise, where Pi=3.14159 . . . and W ranges from about T/6 to T/2; and applying a second weighting function as a digital filter to the fast Fourier transform before displaying same.
Claim 6
Dependent Claim
15 words
The method according to claim 4, wherein the second weighting function is an A-weighting function.
Claim 7
Dependent Claim
15 words
The method according to claim 4, wherein the second weighting function is a B-weighting function.
Claim 8
Dependent Claim
15 words
The method according to claim 4, wherein the second weighting function is a C-weighting function.
Claim 9
Independent Claim
32 words
A method of producing a spectral cardiogram, comprising: generating projections of spectral surfaces of Fourier transforms of heart sounds in real time, and displaying the spectral surfaces in a three dimensional display.
Claim 10
Independent Claim
32 words
A method of producing a spectral cardiogram, comprising: generating projections of spectral surfaces of Fourier transforms of heart sounds in real time, and displaying the spectral surfaces in a three dimensional display.
Claim 11
Dependent Claim
53 words
The method according to claim 8, wherein the projections are generated by placing at least one microphone in the vicinity of a patient's heart to produce an analog output signal corresponding to heart sounds, converting the analog output signal to a digital signal, and performing a fast Fourier transform on the digital signal.
Claim 12
Dependent Claim
24 words
The method according to claim 9, wherein the step of generating the projections further comprises storing the digital signal on a video tape recorder.
Claim 13
Dependent Claim
25 words
The method according to claim 9, wherein the step of generating the projections further comprises storing the analog signal on a digital audio tape recorder.
Claim 14
Dependent Claim
71 words
The method according to claim 9, wherein the step of generating projections further comprises applying an adjustable resolution time-window weighting function, F, to the digital signal over a time-window of duration T, wherein F is described by F=0.5 [1-cos(Pi(t-T/2+W)/W)] for T/2-W<t<T/2+W and F=0 otherwise, where Pi=3.14159 . . . and W ranges from about T/6 to T/2; and applying a second weighting function to the fast Fourier transform before displaying same.
Claim 15
Dependent Claim
15 words
The method according to claim 12, wherein the second weighting function is an A-weighting function.
Claim 16
Dependent Claim
15 words
The method according to claim 12, wherein the second weighting function is a B-weighting function.
Claim 17
Dependent Claim
15 words
The method according to claim 12, wherein the second weighting function is a C-weighting function.
Claim 18
Dependent Claim
17 words
The method according to claim 8, wherein the step of displaying comprises displaying on a video monitor.
Claim 19
Dependent Claim
18 words
The method according to claim 8, wherein the step of displaying comprises displaying on a hard copy device.
Claim 20
Independent Claim
92 words
A method of producing a dynamic spectral cardiogram for picking out irregular sound patterns at different portions of a heart cycle as a function of frequency, comprising: a. means for producing a real-time audio representation of a patient's heart sounds; b. means for producing real time Fourier transforms of the audio representation of the heart sounds; and c. means for producing a three dimensional video display of the same heart sounds by generating projections of spectral surfaces in real time of the Fourier transforms of the audio representation of the heart sounds
Claim 21
Independent Claim
92 words
A method of producing a dynamic spectral cardiogram for picking out irregular sound patterns at different portions of a heart cycle as a function of frequency, comprising: a. means for producing a real-time audio representation of a patient's heart sounds; b. means for producing real time Fourier transforms of the audio representation of the heart sounds; and c. means for producing a three dimensional video display of the same heart sounds by generating projections of spectral surfaces in real time of the Fourier transforms of the audio representation of the heart sounds
Claim 22
Dependent Claim
31 words
The device according to claim 18, wherein the means for producing real time audio representation comprises at least one microphone adapted to be placed in the vicinity of a patient's heart.
Claim 23
Dependent Claim
75 words
The device according to claim 18, wherein the means for producing the video display comprises at least one microphone adapted to be placed in the vicinity of a patient's heart to produce analog output signals corresponding to heart sounds, means for converting the analog output signals of the microphone to digital signals, means for performing a fast Fourier transform on the digital signals, and means for displaying the transforms as spectral surfaces on a display.
Claim 24
Dependent Claim
81 words
The method according to claim 20, wherein the means for producing the video display further comprises means for applying an adjustable resolution time-window weighting function, F, over a time interval of duration, T, to the digital signals, wherein F is described by F=0.5[1-cos(Pi(t-T/2+W)/W)] for T/2-W<t<T/2+W and F=0 otherwise, where Pi=3.14159 . . . and W ranges from about T/6 to T/2; and means for applying a second weighting function as a digital filter to the fast Fourier transform before displaying same.
Claim 25
Dependent Claim
15 words
The device according to claim 21, wherein the second weighting function is an A-weighting function.
Claim 26
Dependent Claim
15 words
The device according to claim 21, wherein the second weighting function is a B-weighting function.
Claim 27
Dependent Claim
15 words
The device according to claim 21, wherein the second weighting function is a C-weighting function.
Claim 28
Independent Claim
58 words
A device for producing a spectral cardiogram, comprising: means receptive of audio representations of hear sounds for generating Fourier transfers thereof in real time, means for generating projections of spectral surfaces of the Fourier transforms of the Fourier transforms of the heart sounds in real time, and means for displaying the spectral surfaces in a three dimensional display.
Claim 29
Independent Claim
58 words
A device for producing a spectral cardiogram, comprising: means receptive of audio representations of hear sounds for generating Fourier transfers thereof in real time, means for generating projections of spectral surfaces of the Fourier transforms of the Fourier transforms of the heart sounds in real time, and means for displaying the spectral surfaces in a three dimensional display.
Claim 30
Dependent Claim
62 words
The device according to claim 25, wherein the means for generating the projections comprises at least one microphone adapted to be placed in the vicinity of a patient's heart to produce an analog output signal corresponding to heart sounds, means for converting the analog output signal to a digital signal, and means for performing a fast Fourier transform on the digital signal.
Claim 31
Dependent Claim
26 words
The device according to claim 26, wherein the means for generating the projections further comprises means for storing the digital signal on a video tape recorder.
Claim 32
Dependent Claim
27 words
The device according to claim 26, wherein the menas for generating the projections further comprises means for storing the analog signal on a digital audio tape recorder.
Claim 33
Dependent Claim
75 words
The device according to claim 26, wherein the means for generating projections further comprises means for applying an adjustable resolution time-window weighting function, F, to the digital signal over a time-window of duration T, wherein F is described by F=0.5 [1-cos(Pi(t-T/2+W)/W)] for T/2-W<t<T/2+W and F=0 otherwise, where Pi=3.14159 . . . and W ranges from about T/6 to T/2; and means for applying a second weighting function to the fast Fourier transform before displaying same.
Claim 34
Dependent Claim
15 words
The device according to claim 29, wherein the second weighting function is an A-weighting function.
Claim 35
Dependent Claim
15 words
The device according to claim 29, wherein the second weighting function is a B-weighting function.
Claim 36
Dependent Claim
15 words
The device according to claim 29, wherein the second weighting function is a C-weighting function.
Claim 37
Dependent Claim
15 words
The device according to claim 25, wherein the means for displaying comprises a video monitor.
Claim 38
Dependent Claim
16 words
The device according to claim 25, wherein the means for displaying comprises a hard copy device.
References Cited (Backward Citations)
US3442264A
Cited
US4413630A
Cited
US4413630B1
Cited
US4458693A
Cited
US4549551A
Cited
US4700712A
Cited
US4792145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |