| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 101 === The auscultation is the way to listen to the heart and lung’s functioning sounds for doctors by direct or indirect method, and further to distinguish the life-signals. Stethoscope belongs to the indirect way as one of the major methods in clinical diagnosis. The doctors can use the stethoscope to assess the patient''s physiological condition repeatedly in the hospital. However, not every patient can be assessed in the hospital, in case, the patients encounter accident or are injured in a noisy environment, the doctors have to judge the patient immediately, in this situation they are not able to use the traditional stethoscope. Traditional stethoscope can not effectively detect the signal exceeds 80 dB noise environment. Therefore, develop a stethoscope which can work in a noisy environment is necessary.
The purpose of this thesis is to research and develop the Ultrasound Doppler Circuit(UDC), it can capture the sound of heart easily and conveniently, it can measure correct signals of the heart sound no need the complex operation. The circuit that we developed can correctly and effectively capture the speed of blood flow in the blood vessels, besides it also can completely receive the sound of the heart which has been transferred through the UDC, that will help doctor or nurses in judgment of the disease.
Before the experiments, we construct one Microphone Circuit and one UDC in advance, then we create a noisy environment according to noise measuring method, use this two circuits to measure heart sound under this noisy environment, by means of the LabVIEW software to acquire the signals from the above two circuits’ output, and also to analyze the signal to noise ratio. This is our measurement method in noisy environment.
After the fulfillment of the experiment, the UDC we offered can correctly acquire the heart sound in the noisy environment exceed 90 dBA.
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