Abstract: The controller of a wearable device is used to determine swim characteristics of a swimmer. The controller is connected to at least one motion sensor selected from a group including a multi-axis gyroscope and a multi-axis accelerometer. The controller is adapted to detect input signals from the at least one motion sensor. The controller is further configured to perform dynamic stroke segmentations based on at least one of the input signals using a stroke segmentation module, extract feature vectors, using feature extraction module, from the at least one input signal based on the stroke segmentations, and determine the swim characteristics by using the feature vectors through a classifier module. The controller dynamically adapts to a style of the swimmer to detect the swim characteristics.

Abstract: A method for determining the spatial orientation of an object encompasses the steps of detecting a rotational speed of the object with the aid of a first sensor; determining an estimated value for the spatial orientation of the object based on the detected rotational speed and a starting value for the spatial orientation; detecting the acceleration ameas acting on the object with the aid of a second sensor; determining the acceleration component of the detected acceleration ameas resulting from the rotational movement, based on the detected rotational speed and a given distance of the second sensor from the rotational axis of the rotational movement; determining the acceleration component agrav of the detected acceleration ameas resulting from the gravity; and correcting the estimated value for the spatial orientation, taking into account the acceleration component agrav resulting from the gravity.

Abstract: A method for determining the spatial orientation of an object encompasses the steps of detecting a rotational speed of the object with the aid of a first sensor; determining an estimated value for the spatial orientation of the object based on the detected rotational speed and a starting value for the spatial orientation; detecting the acceleration ameas acting on the object with the aid of a second sensor; determining the acceleration component of the detected acceleration ameas resulting from the rotational movement, based on the detected rotational speed and a given distance of the second sensor from the rotational axis of the rotational movement; determining the acceleration component agrav of the detected acceleration ameas resulting from the gravity; and correcting the estimated value for the spatial orientation, taking into account the acceleration component agrav resulting from the gravity.