<transcript><audio_30>estimate the orientation and we cannot perfectly calibrate the accelerometer so these are the difficulties we get into and so we did a lot of experiments trying to do whatever we could also adding kinematic constraints based on the human body trying to rule out</transcript> estimate the orientation and we cannot perfectly calibrate the accelerometer so these are the difficulties we get into and so we did a lot of experiments trying to do whatever we could also adding kinematic constraints based on the human body trying to rule out
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