DETERMINATION OF THE SITE OF PRODUCTION OF RESPIRATORY SOUNDS BY SUBTRACTION PHONOPNEUMOGRAPHY

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Abstract
Site of origin of the vesicular lung sound is unknown. A technique (subtraction phonopneumography) is described for determining the relative distance of a sound source from the chest wall. This technique involves the simultaneous recording of lung sounds from 2 different sites on the chest wall, phase inversion of 1 of the signals, and then mixing the signals in a summing amplifier. The resulting degree of cancellation is inversely proportional to the number of sources and the degree to which each source is detected by both microphones simultaneously.

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