Apparatus for measuring cardiac signals, using acoustic and ecg signals
AssigneeBang & Olufsen Technology A/S
InventorSvend-Olof Sjostrom
Life of this patent
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Abstract
An apparatus for measuring the cardiac valve function of a person by analyzing an acoustic signal from the heart. The acoustic signal is synchronized with the electrocardiographic signal obtained from the heart. In order to improve the signal-to-noise ratio of the input electrocardiographic signal, the mains-synchronous noise is subtracted from the input electrocardiographic signal. Before analysis of the acoustic signal, a weighting is performed, compensating for individual differences in, in particular, the layer of body fat.
Claims6
An apparatus for the measurement of the heart valve function of a person's heart comprising a vibration transducer for detecting an acoustic signal at the outer surface of the person's body, a pre-emphasis filter for filtering the acoustic signal to compensate for the degree of obesity of the person, an input for receiving an input electrocardiographic signal from the person's body, an electronic circuit for obtaining a synchronizing signal from the input electrocardiographic signal, and a spectrum analyzer for determining the relative energy distribution in at least one lower and at least one higher frequency range, of the filtered acoustic signal the spectrum analyzer being synchronized by the synchronizing signal.
Dependencies are inferred from the claim text.