Electronic device, method of controlling electronic device, and program

An electronic device comprising a signal processing unit configured to detect a subject of monitoring on the basis of a transmission signal transmitted as a transmission wave and a received signal received as a reflected wave resulting from the transmission wave being reflected by the subject of monitoring,

• wherein the signal processing unit is configured to
• generate first time-frequency analysis information Y1 on the basis of the transmission wave and the reflected wave,
• perform semi-supervised non-negative matrix factorization to calculate the first time-frequency analysis information Y1 as Y1=FG+HU using frequency basis matrices F and H and activation matrices G and U, calculate the frequency basis matrix F as a frequency basis matrix obtained from the reference heart sound waveform obtained in advance, and calculate the activation matrix G using a prescribed cost function;
• and
• generate the heart sound waveform of the subject of monitoring on the basis of the product FG of the frequency basis matrix F and the activation matrix G.

A method of controlling an electronic device, the method comprising:

• detecting a subject of monitoring on the basis of a transmission signal transmitted as a transmission wave and a received signal received as a reflected wave resulting from the transmission wave being reflected by the subject of monitoring;
• generating first time-frequency analysis information Y1 on the basis of the transmission wave and the reflected wave;
• performing semi-supervised non-negative matrix factorization to calculate the first time-frequency analysis information Y1 as Y1=FG+HU using frequency basis matrices F and H and activation matrices G and U, calculate the frequency basis matrix F as a frequency basis matrix obtained from the reference heart sound waveform obtained in advance, and calculate the activation matrix G using a prescribed cost function;
• and
• generating the heart sound waveform of the subject of monitoring on the basis of the product FG of the frequency basis matrix F and the activation matrix G.

A non-transitory computer-readable recording medium storing computer program instructions, which when executed by an electronic device, cause the electronic device to:

• detect a subject of monitoring on the basis of a transmission signal transmitted as a transmission wave and a received signal received as a reflected wave resulting from the transmission wave being reflected by the subject of monitoring;
• generate first time-frequency analysis information Y1 on the basis of the transmission wave and the reflected wave;
• perform semi-supervised non-negative matrix factorization to calculate the first time-frequency analysis information Y1 as Y1=FG+HU using frequency basis matrices F and H and activation matrices G and U, calculate the frequency basis matrix F as a frequency basis matrix obtained from the reference heart sound waveform obtained in advance, and calculate the activation matrix G using a prescribed cost function;
• and
• generate the heart sound waveform of the subject of monitoring on the basis of the product FG of the frequency basis matrix F and the activation matrix G.