Coronary artery disease detection signal processing system and method

A method of receiving and processing at least one auscultatory sound signal from a corresponding at least one auscultatory sound-or-vibration sensor comprising:

• a. placing the corresponding at least one auscultatory sound-or-vibration sensor in proximity to a corresponding sound generator;
• b. generating an auscultatory sound-or-vibration sensor electronic test signal waveform of an auscultatory sound-or-vibration sensor electronic test signal, wherein the operation of generating said auscultatory sound-or-vibration sensor electronic test signal waveform comprises:
• i. selecting a plurality of nominal test frequencies;
• and
• ii. for each nominal test frequency of said plurality of nominal test frequencies:
• a). calculating a corresponding STFT frame-synchronized sinusoidal test frequency responsive to said nominal test frequency, wherein said corresponding STFT frame-synchronized sinusoidal test frequency has a corresponding integral number of wavelengths within a time-frame interval of a Short Time Fourier Transform (STFT), and said corresponding STFT frame-synchronized sinusoidal test frequency is an integer factor times a ratio of a sampling frequency divided by a number of points of said Short Time Fourier Transform (STFT);
• and
• b). storing either said corresponding STFT frame-synchronized sinusoidal test frequency or a waveform spanning said time-frame interval generated responsive thereto:
• c. applying said auscultatory sound-or-vibration sensor electronic test signal to said corresponding sound generator, wherein said auscultatory sound-or-vibration sensor electronic test signal comprises a plurality of frequency components, and each frequency component of said plurality of frequency components comprises an integral number of wavelengths;
• d. generating an acoustic sound signal from said corresponding sound generator responsive to said auscultatory sound-or-vibration sensor electronic test signal;
• e. exposing said at least one auscultatory sound-or-vibration sensor to said acoustic sound signal and receiving a corresponding at least one auscultatory sound signal responsive thereto;
• and
• f. determining whether or not said corresponding at least one auscultatory sound-or-vibration sensor is functioning properly responsive to an analysis of a Fourier Transform of said corresponding at least one auscultatory sound signal.