Patent ID: 9119566
Filing Date: 2015-09-01
Classification: A61B

Abstract:
1. A present-on-bed determination apparatus comprising: a sensor unit usable with a bottom bedding and configured to measure biological displacement of a human subject on the bottom bedding so as to output a measurement signal indicating a measurement result; a first signal processing unit configured to amplify the measurement signal with a first gain so as to output a first output signal; a first A/D conversion unit configured to output a plurality of first level values obtained by A/D conversion of the first output signal; and a determination unit configured to determine whether or not the human subject is present on the bottom bedding in accordance with a dispersion indicator that indicates dispersion degree of the plurality of the first level values, wherein the first gain is set so that a period during which the first level value stays at a maximum attainable value and a period during which the first value stays at a minimum attainable value are included in one cycle of a periodic component contained in the biological displacement of the human subject present on the bottom bedding.