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Weak murmurs related to coronary artery disease might be masked in ambient noise when heart sounds are recorded in clinical settings. The aim of the current study was to characterize the influx of ambient noise through the chest and through the microphone's coupler house. To estimate the transmission through the coupler house the coupler was placed in contact with a heavy block of steel in an anechoic...
The aim of the study was to design and evaluate a coupler/microphone system for recording weak murmurs from stenoses in the coronar artery. The suggested design is based on the use of a high quality microphone, coupled to the chest through a small air cavity. Since the determination of the exact frequency range of interest related to murmurs is part of the purpose of the study, one of the goals of...
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