Automatic Wheeze Detection System as Symptoms of Asthma Using Spectral Power Analysis

In Nineteen Century Laennec noticed that respiratory sound generated by the lungs during inspiration and expiration contains information about respiratory diseases who also invented the relationship between human respiratory diseases and respiratory auscultation. He theninvented stethoscope in 1921 which enabled physicians to listen to respiratorysounds of their patients and detect any symptomatic signs. Wheeze to occur as symptoms of respiratory diseases result of airway obstruction and flow limitation at critical flow rates in frequency range between 100 Hz to above 1000 Hz. It is present dominantly during expiration and it lasts from 80 – 250 ms. 

Wheezing is not associated with asthma only, but to other pulmonary pathology such as chronic obstructive pulmonary disease (COPD), bronchiolitis. For diagnosis the asthmatic patient physician normally used stethoscope as itis conventional method. But auscultation using stethoscope is subjective method and it is high possibility of false diagnosis because it need well trained physician to recognize abnormalities and ability to differentiate between the sound patterns. As day to day increasing number of asthmatic patients there is a need of automatic monitoring of the wheeze to assist the physicians in diagnosing and monitoring the patient.