Abstract: A travel direction determination apparatus is provided, including: a sensor signal acquisition unit that acquires sensor signals from sensors mounted in a mobile device; a first travel direction calculation unit that calculates a travel direction of the user without relying on a walking state of the user; a second travel direction calculation unit that calculates the travel direction of the user based on the sensor signals when the user who holds the mobile device is in a walking state; and a determination unit that determines the travel direction of the user first to the travel direction calculated by the first travel direction calculation unit, and then to the travel direction calculated by the second travel direction calculation unit, responding to changes in the state of the user from non-walking state to walking state.

Abstract: To estimate an accurate travel direction of a user based on sensor signals from a mobile device being held by the user even if the user moves ahead while moving the mobile device right and left, a travel direction information output apparatus, a travel direction information output method, and a computer readable medium are provided, the travel direction information output apparatus including a travel direction estimation unit that calculates a travel direction of the user, a rotation amount calculation unit that calculates rotation amounts about a gravity axis of the mobile device being held by the user, and a selection unit that selects, based on an integrated value of the rotation amounts, from either to output travel direction information according to the travel direction calculated by the travel direction estimation unit or to output travel direction information that keeps previous travel direction information output.

Abstract: In order to accurately identify a hold state of a mobile device held by a user while the user is moving, provided is a hold state change detection apparatus including an acquiring section that acquires an output signal of a sensor mounted in the mobile device held by the user; a change detecting section that detects a change in a hold state of the mobile device based on the output signal of the sensor; and a hold state judging section that judges the hold state based on the output signal of the sensor. During a prescribed time from the time when the change detecting section detects the change in the hold state, information indicating the hold state prior to the detection of the change in the hold state is output. Also provided is a hold state change detection method and program.

Abstract: The sensor device includes a counter for counting the number of count commands used to perform measurements while maintaining among multiple sensor devices the ratio of measurement intervals; a ratio-holding-unit for setting the ratio to a desired ratio and holding respective values of the ratio for each of the multiple sensor devices; a sampling-timing-generating-unit for receiving a count value of the counter and the setting value of the ratio held by the ratio-holding-unit, and for generating a sampling timing signal based on the comparison result between the count value and the setting value; and a sampling-unit for sampling a detection signal detected by the detecting unit, by using the sampling timing signal generated by the sampling-timing-generating-unit.

Abstract: A travel direction determination apparatus is provided, including: a sensor signal acquisition unit that acquires sensor signals from sensors mounted in a mobile device; a first travel direction calculation unit that calculates a travel direction of the user without relying on a walking state of the user; a second travel direction calculation unit that calculates the travel direction of the user based on the sensor signals when the user who holds the mobile device is in a walking state; and a determination unit that determines the travel direction of the user first to the travel direction calculated by the first travel direction calculation unit, and then to the travel direction calculated by the second travel direction calculation unit, responding to changes in the state of the user from non-walking state to walking state.

Abstract: To estimate an accurate travel direction of a user based on sensor signals from a mobile device being held by the user even if the user moves ahead while moving the mobile device right and left, a travel direction information output apparatus, a travel direction information output method, and a computer readable medium are provided, the travel direction information output apparatus including a travel direction estimation unit that calculates a travel direction of the user, a rotation amount calculation unit that calculates rotation amounts about a gravity axis of the mobile device being held by the user, and a selection unit that selects, based on an integrated value of the rotation amounts, from either to output travel direction information according to the travel direction calculated by the travel direction estimation unit or to output travel direction information that keeps previous travel direction information output.

Abstract: In order to accurately determines the hold state of a mobile device possessed by a user while moving, provided is a hold state judging apparatus including an acquiring section that acquires output signals of sensors mounted in a mobile device held by a user; a pattern storage section that stores, in association with each other, information indicating a plurality of hold states of the mobile device and reference characteristic amounts of the output signals of the sensors obtained in advance respectively for the plurality of hold states; a hold state judging section that judges the hold state of the mobile device based on which of the reference characteristic amounts stored in the pattern storage section characteristic amounts of the output signals of the sensors acquired by the acquiring section correspond to. Also provided is a program.

Abstract: In order to accurately identify a hold state of a mobile device held by a user while the user is moving, provided is a hold state change detection apparatus including an acquiring section that acquires an output signal of a sensor mounted in the mobile device held by the user; a change detecting section that detects a change in a hold state of the mobile device based on the output signal of the sensor; and a hold state judging section that judges the hold state based on the output signal of the sensor. During a prescribed time from the time when the change detecting section detects the change in the hold state, information indicating the hold state prior to the detection of the change in the hold state is output. Also provided is a hold state change detection method and program.

Abstract: In order to accurately determines the hold state of a mobile device possessed by a user while moving, provided is a hold state judging apparatus including an acquiring section that acquires output signals of sensors mounted in a mobile device held by a user; a pattern storage section that stores, in association with each other, information indicating a plurality of hold states of the mobile device and reference characteristic amounts of the output signals of the sensors obtained in advance respectively for the plurality of hold states; a hold state judging section that judges the hold state of the mobile device based on which of the reference characteristic amounts stored in the pattern storage section characteristic amounts of the output signals of the sensors acquired by the acquiring section correspond to. Also provided is a program.

Abstract: The sensor device includes a counter for counting the number of count commands used to perform measurements while maintaining among multiple sensor devices the ratio of measurement intervals; a ratio-holding-unit for setting the ratio to a desired ratio and holding respective values of the ratio for each of the multiple sensor devices; a sampling-timing-generating-unit for receiving a count value of the counter and the setting value of the ratio held by the ratio-holding-unit, and for generating a sampling timing signal based on the comparison result between the count value and the setting value; and a sampling-unit for sampling a detection signal detected by the detecting unit, by using the sampling timing signal generated by the sampling-timing-generating-unit.