Yip Lung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references. / Abstracts in English and Chinese. / Chapter 1 --- Introduction / Chapter 1.1 --- Heart and Lung Diseases --- p.1 / Chapter 1.1.1 --- Hong Kong --- p.1 / Chapter 1.1.2 --- China --- p.2 / Chapter 1.1.3 --- the United States of America (USA) --- p.3 / Chapter 1.2 --- Auscultation --- p.3 / Chapter 1.2.1 --- Introduction of Auscultation --- p.4 / Chapter 1.2.2 --- Comparison between Auscultation and Ultrasound --- p.6 / Chapter 1.3 --- Stethoscope --- p.7 / Chapter 1.3.1 --- History of Stethoscope --- p.7 / Chapter 1.3.2 --- New Electronic Stethoscope --- p.14 / Chapter 1.4 --- Main Purpose of the Study --- p.16 / Chapter 1.5 --- Organization of Thesis --- p.16 / References --- p.18 / Chapter 2 --- A New Electronic Stethoscope's Head / Chapter 2.1 --- Introduction --- p.20 / Chapter 2.2 --- Biopotential Electrode --- p.21 / Chapter 2.2.1 --- Flexible Electrode --- p.21 / Chapter 2.2.2 --- Laplacian Electrocardiogram --- p.22 / Chapter 2.3 --- Transducer --- p.25 / Chapter 2.4 --- Design of the Head of Stethoscope --- p.26 / Chapter 2.5 --- Experimental Results --- p.27 / Chapter 2.5.1 --- Bias Voltage of Condenser Microphone --- p.27 / Chapter 2.5.2 --- Frequency Response of New Stethoscope's Head --- p.29 / Chapter 2.6 --- Discussion --- p.30 / Chapter 2.7 --- Section Summary --- p.31 / References --- p.33 / Chapter 3 --- Signal Pre-processing Unit / Chapter 3.1 --- Introduction --- p.35 / Chapter 3.2 --- High Input Impedance IC Amplifier --- p.36 / Chapter 3.3 --- Voltage Control Voltage Source High Pass Filter Circuit --- p.37 / Chapter 3.4 --- Multiple Feed Back Low Pass Filter Circuit --- p.39 / Chapter 3.5 --- Overall Circuit --- p.41 / Chapter 3.6 --- Experimental Results --- p.43 / Chapter 3.7 --- Discussion --- p.46 / Chapter 3.8 --- Section Summary --- p.47 / References --- p.48 / Chapter 4 --- Central Platform / Chapter 4.1 --- Introduction --- p.49 / Chapter 4.2 --- Adaptive Filter --- p.49 / Chapter 4.2.1 --- Introduction to Adaptive Filtering --- p.49 / Chapter 4.2.2 --- Least-Mean-Square (LMS) Algorithm --- p.51 / Chapter 4.2.3 --- Applications --- p.52 / Chapter 4.3 --- Offline Processing --- p.54 / Chapter 4.3.1 --- WINDAQ and MATLAB --- p.55 / Chapter 4.3.2 --- Direct Reference Algorithm --- p.57 / Chapter 4.3.3 --- Determination of Parameters in DRA --- p.62 / Chapter 4.3.4 --- Experimental Results of DRA --- p.67 / Chapter 4.3.5 --- Acoustic Waveform Based Algorithm --- p.72 / Chapter 4.3.6 --- Experimental Results of AWBA --- p.81 / Chapter 4.4 --- Online Processing --- p.85 / Chapter 4.4.1 --- LABVIEW --- p.85 / Chapter 4.4.2 --- Automated Gain Control --- p.88 / Chapter 4.4.3 --- Implementation of LMS adaptive filter --- p.89 / Chapter 4.4.4 --- Experimental Results of Online-AGC --- p.92 / Chapter 4.5 --- Discussion --- p.93 / Chapter 4.6 --- Section Summary --- p.97 / References --- p.98 / Chapter 5 --- Conclusion and Further Development / Chapter 5.1 --- Conclusion of the Main Contribution --- p.100 / Chapter 5.2 --- Future Works --- p.102 / Chapter 5.2.1 --- Modification of the Head of Stethoscope --- p.102 / Chapter 5.2.2 --- Validation of Abnormal Breath --- p.102 / Chapter 5.2.3 --- Low Frequency Analysis --- p.102 / Chapter 5.2.4 --- AGC-AWBA Approach --- p.102 / Chapter 5.2.5 --- Standalone Device --- p.103 / Chapter 5.2.6 --- Demand on Stethoscope --- p.109 / References --- p.110 / Appendix / Chapter A.1 --- Determination of parameters in VCVS High Pass Filter --- p.106 / Chapter A.2 --- Determination of parameters in MFB Low Pass Filter --- p.110 / Chapter A.3 --- Source code of DRA (MATLAB) --- p.114 / Chapter A.4 --- Source code of AWBA (MATLAB) --- p.129 / Chapter A.5 --- Source code of online AGC (LABVIEW) --- p.134