Medical decision support system
AssigneeAusculsciences, Inc.
InventorsSergey A. TELENKOV, Robin F. CASTELINO, David GLOAG, Daniel LABONTÉ, Md Shahidul ISLAM
Life of this patent
Estimating the term…
Abstract
An auscultatory sound signal from at least one auscultatory sound-or-vibration sensor is filtered with a high-pass filter and then segmented into a plurality of associated heart cycle segments responsive to associated R-peak locations of an electrographic envelope signal representing an envelope response to an even power of an associated electrographic signal from an ECG sensor. A representation an envelope responsive to an even power of said auscultatory sound signal within said at least one heart cycle is locally modeled about at least a second peak to provide for locating the start of diastole of said at least one heart cycle.
Claims27
A method of segmenting an auscultatory sound signal, comprising:
- a. receiving an electrographic signal from an ECG sensor;
- b. generating an electrographic envelope signal representing an envelope responsive to an even power of said electrographic signal;
- c. locating a plurality of peaks of said electrographic envelope signal corresponding to a corresponding plurality of R-peaks of said electrographic signal;
- d. receiving at least one auscultatory sound signal from a corresponding at least one auscultatory sound-or-vibration sensor;
- e. filtering said at least one auscultatory sound signal with a high-pass filter so as to generate a corresponding at least one high-pass-filtered auscultatory sound signal;
- f. segmenting said corresponding at least one high-pass-filtered auscultatory sound signal into at least one heart-cycle segment responsive to said plurality of peaks of said electrographic envelope signal;
- g. for each one said at least one heart-cycle segment:
- i. generating an auscultatory envelope signal representing an envelope responsive to an even power of said auscultatory sound signal within said one said at least one heart-cycle segment;
- ii. locating at least a second peak of said auscultatory envelope signal corresponding to a second heart sound;
- iii. generating a local mathematical model of at least said second peak of said auscultatory envelope signal, wherein said local mathematical model comprises a quadratic equation;
- and
- iv. locating at least one root selected from the group consisting of a first root of said local mathematical model and a second root of said local mathematical model, so as to provide for determining an associated start of diastole of said one said at least one heart-cycle segment.
Dependencies are inferred from the claim text.