Disclosed herein are devices, systems, and methods for officiating, spectating, and scorekeeping for flag football games using one or more wirelessly interconnected electronic devices. In some embodiments, a plurality of graphical user interfaces are provided on a mobile electronic device, the interfaces allowing game officials to create games that are visible to spectators, players, coaches, and statisticians/scorekeepers on a shared geographic map. After spectators, players, coaches, and/or statisticians/scorekeepers join a game, an official inputs information regarding timing and scorekeeping of the game to an interface of a mobile device carried by the official, and the inputted information is broadcasted from the official's device to mobile devices of spectators, players, and coaches, where it is displayed in real-time on graphical user interfaces of the receiving devices. The interfaces may facilitate real-time synchronization of a play-clock and/or go-clock amongst officials, spectators, players, coaches, and/or statisticians/scorekeepers.

An electronic device may display a first lap time representation, and may move the first lap time representation in accordance with a first amount of elapsed time. While moving the first lap time representation, the electronic device may detect a lap input. In response to the lap input, the electronic device may cease movement of the first lap time representation, display a second lap time representation, and move the second lap time representation in accordance with a second amount of elapsed time. A relative positioning of the first lap time representation and the second lap time representation may correspond to a difference between a first lap time and a second lap time. In some embodiments, the electronic device may update the timescales of lap time representation(s) in accordance with a rotational input. In some embodiments, the electronic device may update a timer duration setting in accordance with a rotational input.

A system and method for timing personal physical activity provides an athlete with the ability to self-time runs over specific distances from anywhere. This can be used for any event that is timed over a specified distance. A software application utilizes the internal hardware commonly provided by many smart devices, such as global positioning system (GPS) modules and accelerometers, to assist the user in tracking and recording the time and distance of a walk/run. The software application is compatible with any smart devices, such as smart phones, smart watches, and a variety of other smart wearables. In addition, GPS is utilized to track and record the distance travelled by the user. The software application also uses a stopwatch-like mechanism in order to track and record the duration of an exercise. Furthermore, the GPS distance tracker and the stopwatch-like timer may be used together to create a pacemaker/pacesetter for the user.

In a measurement unit, a primary acceleration sensor is fixed at the center of gravity of a flying object or at a position within a certain error range from the center of gravity. A secondary acceleration sensor is fixed inside the flying object so as to be spaced from the center of gravity of the flying object. In a measurement apparatus, an acquirer acquires a primary acceleration measured by the primary acceleration sensor during flight of the flying object and a secondary acceleration measured by the secondary acceleration sensor during the flight of the flying object. An estimator estimates a spin rate per unit time of the flying object from the acquired primary acceleration and the acquired secondary acceleration using maximum likelihood estimation.

In a measurement unit, a primary acceleration sensor is fixed at the center of gravity of a flying object or at a position within a certain error range from the center of gravity. A secondary acceleration sensor is fixed inside the flying object so as to be spaced from the center of gravity of the flying object. In a measurement apparatus, an acquirer acquires a primary acceleration measured by the primary acceleration sensor during flight of the flying object and a secondary acceleration measured by the secondary acceleration sensor during the flight of the flying object. An estimator estimates a spin rate per unit time of the flying object from the acquired primary acceleration and the acquired secondary acceleration using maximum likelihood estimation.

The present disclosure relates to a method for measuring a speed of a sports device. The method includes: acquiring movement data of the sports device during a process of tracking the sports device, the movement data being collected by a sensor disposed at a bottom of the sports device; calculating a linear speed and a rotational speed of the sports device based on accelerations of three axes in the movement data; and combining the linear speed and the rotational speed to obtain a movement speed of the sports device. In addition, the present disclosure also provides an apparatus for measuring a speed of a sports device, which corresponds to the above method. The method and the apparatus for measuring a speed of a sports device can improve the credibility of the speed measurement of the sports device.

A device for monitoring athletic performance of a user has a wristband configured to be worn by the user. The electronic module may include a controller and a screen and a plurality of user inputs operably associated with the controller. The user inputs may include a user input configured to be applied by the user against the screen and in a direction generally normal to the screen. The controller may further be configured to generate one or more user interfaces in response to various user inputs and conditions. For example, the controller may generate workout mode interfaces and non-workout mode interfaces including various goal information, workout data, reminders and the like. In one or more arrangements, multiple types of information may be displayed simultaneously.

Batting practice systems and methods that allow a baseball batter to match the timing of the batter's swing to the pitch speed of a pitcher.

An athletic timing device includes a housing carrying a touch-less sensor. The device is self-contained and can be easily placed at generally any point on a surface used for athletic activities, e.g., a football field, basketball court, or a track. The collective design of the sensor and the housing facilitates activation of the sensor without interfering with normal athletic activities, i.e., activities can be performed and timed under normal conditions without physical contact between the timing device and objects involved in the athletic activity. Example activities that can activate the sensor include snapping a football, kicking a soccer ball, or sprinting away from (or back to) the device.

A performance information notification device according to an application example includes: an acquisition unit which acquires information indicating at least one of load exercise and rest in interval exercise; and a notification unit which reports performance information about at least one of a time during which the load exercise is carried out and a time during which the rest is carried out, based on the information indicating at least one of the load exercise and the rest.