Patent ID: 11875697
Assignee: WEST & BERGH HOLDING AB
Field: Control (Instruments)
Classification: CPC G  A | IPC A  G

Claim 0:
1. A sports training aid comprising
a sensor unit, the sensor unit being configured to be attachable to a user's body, or a user's sports implement, the sensor unit comprising:
a motion sensor module;
a feedback stimulator or means for wirelessly communicating with a feedback stimulator;
a processor;
wherein the sports training aid is configured to provide real time feedback related to a motion fault of a studied sports motion performed by the user, and
wherein the sensor unit is intended to be attached to a user's body at a representative location, the representative location being bound to travel a path representative of the studied sports motion, and
wherein the motion sensor module of the sensor unit comprises acceleration sensors and gyro sensors, and
wherein the processor of the sensor unit is configured to determine, with the aid of data from the motion sensor module, a still position corresponding to an event wherein the sensor unit is determined to be still, and
wherein the processor is configured to keep track of the movements of the sensor module of the sensor unit relative to the still position, and wherein the processor is configured to activate, in real time, the feedback stimulator upon real time detection of a sports motion fault of the studied sports motion of the user as represented by the motion path of the motion sensor module of the sensor unit, and
the sports motion fault determined by the motion path of the motion sensor module deviating or not deviating from a threshold represented by a radius of a virtual tube, or the sports motion fault determined by the motion path of the motion sensor deviating or not deviating a predetermined distance perpendicular to a reference plane within a predetermined interval of rotational angle, and
wherein the reference plane alignment is based on a still position of the motion sensor, and
wherein the processor is configured to determine the still position of the motion sensor using a method including the following steps:
calculating repeatedly an acceleration vector based on data from the accelerometer sensors;

determining that acceleration parameters are below a predetermined threshold value;
determining that the absolute value of the accelerometer vector is within a predetermined interval from earth gravity acceleration; and
wherein the sports training aid further comprises a still indicator, and the sports training aid is configured to activate the still indicator when the still position is determined.