Abstract: An example process includes: concurrently receiving an audio stream and a video stream; determining, based on a first portion of the audio stream received within a predetermined duration before a current time and a first portion of the video stream received within the predetermined duration before the current time, whether a visual attention of a user is directed to an electronic device while the user is speaking; and in accordance with a determination that the visual attention of the user is directed to the electronic device while the user is speaking: identifying a second portion of the audio stream to include user speech intended for the electronic device; initiating, by a digital assistant operating on the electronic device, a task based the second portion of the audio stream; and providing an output indicative of the initiated task.

Abstract: Systems and methods are provided for tracking a moving person. The system comprises a controller configured to receive acceleration data that characterizes an acceleration of the moving person in three dimensions. The controller comprises a step rate component that determines a step rate for the person based on a vertical component of the acceleration data. The controller also comprises a body offset component that determines a body offset angle based on a spectral analysis of the acceleration data and the step rate. The controller further comprises a velocity component that determines a reference velocity vector based on the body offset angle and the step rate.

Abstract: Systems and methods are provided for tracking a moving person. The system comprises a controller configured to receive acceleration data that characterizes an acceleration of the moving person in three dimensions. The controller comprises a step rate component that determines a step rate for the person based on a vertical component of the acceleration data. The controller also comprises a body offset component that determines a body offset angle based on a spectral analysis of the acceleration data and the step rate. The controller further comprises a velocity component that determines a reference velocity vector based on the body offset angle and the step rate.