The origin of phonocardiographic sounds has been investigated in relation to the feasibility of automatic analysis based on zero-crossing techniques. Studies using actual valves and fluidic analog methods as a means of synthesizing the phonocardiogram are described, and the design and clinical evaluation of a specialized computr for phonocardiogram analysis are presented.
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https://aes2.org/publications/elibrary-page/?id=1606
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