State detecting device, electronic apparatus, program and state detecting method

A non-transitory computer-readable medium having a program embedded therein, the program causing a computer to function as:

• an acquisition unit which acquires an x-axis component, a y-axis component and a z-axis component of an acceleration signal from an acceleration sensor included in a telephone;
• and
• an arithmetic unit which performs arithmetic processing,
• the arithmetic unit:
• calculating a coordinate transformation matrix for removing acceleration components due to gravitational acceleration, the coordinate transformation matrix being calculated from an average value of the x-axis component, an average value of the y-axis component and an average value of the z-axis component acquired by the acquisition unit,
• calculating a first indicator value based on the coordinate transformation matrix, the x-axis component, the y-axis component and the z-axis component,
• finding a first feature amount based on an amplitude of the acceleration signal, the first indicator value being a value that indicates a change in acceleration in a horizontal direction,
• performing band pass filter processing of N amplitudes of the acceleration signal to find a second feature amount, N being an integer greater than 1,
• finding a second indicator value from the first feature amount and the second feature amount, wherein
• a value based on an amplitude without performing filter processing is used as the first feature amount, and a value based on an amplitude after passing through a band pass filter with a pass band of a low-frequency of 1 to 3 Hz is used as the second feature amount, and
• the ratio of the first feature amount to the second feature amount is used as the second indicator value, and
• discriminating between a first state where a person is in a first type of vehicle and a second state where the person is in a second type of vehicle that is different from the first type, based on the first indicator value and the second indicator value.

A state detecting method comprising:

• acquiring an x-axis component, a y-axis component and a z-axis component of an acceleration signal from an acceleration sensor included in a telephone;
• calculating a coordinate transformation matrix for removing acceleration components due to gravitational acceleration, the coordinate transformation matrix being calculated from an average value of the x-axis component, an average value of the y-axis component and an average value of the z-axis component that are acquired;
• calculating a first indicator value based on the coordinate transformation matrix, the x-axis component, the y-axis component and the z-axis component, the first indicator value being a value that indicates a change in acceleration in the horizontal direction,
• finding a first feature amount based on an amplitude of the acceleration signal;
• performing band pass filter processing of N amplitudes of the acceleration signal to find a second feature amount, N being an integer greater than 1,
• finding a second indicator value from the first feature amount and the second feature amount, wherein
• a value based on an amplitude without performing filter processing is used as the first feature amount, and a value based on an amplitude after passing through a band pass filter with a pass band of a frequency of 1 to 3 Hz is used as the second feature amount, and
• the ratio of the first feature amount to the second feature amount is used as the second indicator value;
• and
• discriminating between a first state where a person is in a first type of vehicle and a second state where the person is in a second type of vehicle that is different from the first type, based on the first indicator value and the second indicator value.