Patent ID: 9149231
Filing Date: 2015-10-06
Classification: A61B,B60W

Abstract:
1. An alcohol-drinking detecting system to analyze a biological signal obtained from an upper body of a person by a biological signal measuring device to estimate presence/absence of alcohol in the body, the alcohol-drinking detecting system comprising: circuitry configured to: obtain, from a time-series waveform of the biological signal, a time-series fluctuation regarding a frequency of the time series-waveform; and determine an alcohol-drinking state when a tendency of the time-series fluctuation regarding the frequency obtained from the circuitry is separated from a tendency of a time-series fluctuation regarding the frequency at a non-drinking time, obtain a time-series waveform of a frequency in the time-series waveform of the biological signal; perform moving calculation for obtaining, in the time-series waveform of the frequency of the biological signal obtained by the circuitry, a slope of the frequency for each of predetermined time windows set in a predetermined overlapping time to output a time-series change of the slope of the frequency obtained for each time window as a frequency slope time-series waveform; determine the alcohol-drinking state according to whether or not, regarding a difference of an integral value of a positive slope and a difference of an integral value of a negative slope obtained by dividing the frequency slope time-series waveform into the positive slope and the negative slope to integrate the respective positive and negative slopes and comparing integral values of the positive slope and the negative slope with those in a normal state before alcohol drinking, the difference of the integral value of the positive slope decreases to a predetermined difference or more and the difference of the integral value of the negative slope increases to a predetermined difference or more; and output the alcohol-drinking state as determined by the circuitry.