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The document discusses using smartphone microphones to analyze coughing sounds from COVID-19 patients in order to detect acoustic patterns that may reveal information about their lung condition and oxygen levels. Doctors aim to listen for crackles and wheezes in lung sounds between 25-1500Hz that could provide insights about blood oxygenation, pneumonia symptoms, and breathing difficulties associated with the virus. The proposed method involves patients coughing near their phone microphone so the sound can be amplified, filtered, and processed in the app to instantly display diagnostic results.