| 摘要 |
A system and a method for clearly obtaining heart sounds in the presence of noise, including, from a systemic point of view (a) a pair of close-proximity sound transducers applied to a pair of sites on the human body for gathering heart and external-source sounds, and for producing from such gathered sounds related, electrical signals, (b) structure coupled to these two transducers for receiving, and producing electronic subtraction, one-from-another, of, such two produced signals, and (c) structure operatively connected to the above first-mentioned structure, for producing a discernable, interpretable output based upon such electronic subtraction. Methodologically, the invention proposes (a) declaring low-frequency sounds which arrive at such transducers from the heart to be near-field sounds, (b) declaring all other low-frequency sounds which arrive at such transducers to be near-field sounds, and (c) employing the arriving far-field sounds in a self-cancellation mode to clarify information content in the arriving near-field sounds.
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