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Working Papers

 

 

Why it may be incorrect to Process Dynamic Signals Using FFT
 

Noise Removal from the Recorded Acoustic Signals
 

Version 3 Release Highlights - Large Screen Version

CASE1: INNOCENT STILLS MURMUR IN A CHILD

                                  S1 Sound         Systolic Murmur                         S2                           S3


Characteristic Murmur Frequency Spectrum -- narrow frequency range around 105 Hz peak frequency
 


                                                              S1                   Murmur                         S2                   S3

Heart Energy Signature - high contrast picture


                                                             S1                   Murmur                         S2                   S3

Heart Energy Signature - standard color scheme

                                     S1                   Murmur                         S2                   S3

Heart Energy Signature - "nuclear cardiology" color scheme

                                                               S1                   Murmur                         S2                   S3

Heart Energy Signature and Heart Power Plot

                                                                S1                   Murmur                         S2                   S3

Heart Energy Signature and Heart Power Plot

                                                                 S1                   Murmur                         S2                   S3

Heart Energy Signature and Heart Power Plot - at instantaneous frequency of the Murmur

    

Murmur Scores - Intensity, Frequency (Pitch), Time and Grade on
Freeman-Levine Grade

CASE2: HYPERTROPHIC CARDIOMYOPATHY


         Hypertophic Cardiomyopathy  - Phonocardiographic Display - 6 heartbeats


Hypertophic Cardiomyopathy  - Heart Energy Signature Spectrogram


                           S1                            Murmur                                        S2

Hypertophic Cardiomyopathy  - Individual Heart Beat Spectrogram

                                          S1                            Murmur                                        S2

Hypertophic Cardiomyopathy  - Individual Heart Beat Spectrogram

 

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Copyright: 2004-2009 BioSignetics Corporation
Last modified: 02/02/09