Method of how frequencies were derived for KG overlay
Step 1
The original heart sounds were recorded from the tricuspid area of the chest with an electronic stethoscope, model E, from Cardionics, and sent to an iMac computer containing Pro Tools digital audio workstation software.
Step 2 (see figure 1,2)
For analysis and transformation of the heart sounds into a music melody, the iMac computer was interfaced with a PC computer containing LabVIEW graphical programming software that creates virtual instruments (vi). Within the LabVIEW environment, two phases were dealt with: Phase 1 – the original acquired heart sounds were analyzed for the voltage changes and duration of its waveform (heart rate variability). These findings were sent to the Waveform Amp – Scan transfer vi (intermediary source) and transferred to phase 2.
Phase 2 – dealt with the transformation of the heart sound waveform data into a music melody.
Step 3 (see figure 2,3)
This step computes the temporal aspects of the configured frequencies of the heart sounds relative to the number of variable samples that is read by the DAQmx read VI. This is accomplished by organizing the changing voltage values of the heart sound waveform into 19 voltage bins.
The purpose of the voltage bins is to allow a single voltage value to pass through the input of a LabVIEW virtual instrument function called: In Range and Coerce (IRC) virtual instrument (vi).
The result of the IRC will produce a function based on derivatives and permutations of the Golden ratio number (square root of 5 minus 1÷2 = 0.6180339887498948). The functionates of this process fractionalizes the duration of each cardiac cycle (waveform) into samples to read (DAQmx read VI) relative to the space/time sequences of electrical conduction through cardiac muscle.
