A Controller to Determine Swim Characteristics of a Swimmer and Method Thereof

A controller for a wearable device for dynamic segmentation of swim strokes, the controller connected to at least one motion sensor selected from a group consisting of comprising a multi-axis gyroscope and a multi-axis accelerometer, the controller adapted configured to:

• process at least one dominant axis signal from detected input signals of the at least one motion sensor through a filter module and output a filtered signal;
• generate an envelope signal from the filtered signal based on state machine conditions, comprising:
• when a value of the filtered signal is decreasing, then the envelope signal decreases at a predefined rate, referenced as a fall state, and
• when the value of the filtered signal is increasing and exceeds a value of the envelope signal in the fall state, then follow the filtered signal referenced as a follow state;
• and
• detect a stroke segment between occurrence of any one of two follow states and fall states.

A method of determining swim characteristics of a swimmer using a wearable device, the method comprising:

• receiving input signals from at least one motion sensor;
• dynamically segmenting strokes based on at least one of the received input signals using a stroke segmentation module;
• extracting feature vectors from the received input signals based on the said stroke segments using a feature extraction module and
• determining the swim characteristics using the extracted feature vectors through a classifier module,
• wherein the at least one motion sensor includes a multi-axis gyroscope or a multi-axis accelerometer.