Wheezing detection apparatus

A wheezing detection system, comprising:

• a breathing sound detection unit configured to detect a breathing sound of a measurement subject and acquire a breathing sound signal in a time series expressing the breathing sound;
• a processor configured to:
• set a plurality of addition unit periods,
• set a plurality of pre-determined processing unit periods within each of the plurality of addition unit periods,
• in each of the plurality of pre-determined processing unit periods, convert the breathing sound signal into a frequency space to acquire a frequency spectrum of the breathing sound,
• select a dominant peak having the largest area among a plurality of peaks in the frequency spectrum in each pre-determined processing unit period;
• determine whether or not the dominant peak indicates wheezing based on a parameter (L/D) calculated from a height and a width of the peak,
• collect the dominant peaks indicated as wheezing in each addition unit period, and
• classify the collected dominant peaks into different levels to represent different powers of wheezing;
• and
• a display configured to display an amount of dominant peaks in the different levels in each addition unit period.