Detecting and providing player information with sensor at the player side

1. A game ball for detecting and providing information assigned to players of a ball game, wherein the game ball contains:

a magnetic field generator for generating an alternating magnetic field, wherein the magnetic field generator contains at least three coils that are electrically actuated such that a resulting magnetic field vector rotates in three dimensions, wherein the frequency at which the resulting magnetic field vector rotates is considerably higher than a rotation frequency of the game ball that is possible during the game;

a transceiver for receiving radio signals which are transmitted in response to a detection of the generated alternating magnetic field and which contain an ID which can be assigned to a player, and for transmitting collected player information;

a control unit for evaluating received radio signals and for assigning timestamps to IDs of received radio signals;

a source of energy; and

a memory for writing and reading out player information based on the IDs with assigned timestamps.

2. The game ball according to claim 1 , which further contains a pressure sensor arrangement and an acceleration sensor.

3. A system for detecting and providing information assigned to soccer players, wherein the system contains:

a soccer ball comprising

a centrally arranged magnetic field generator for generating an alternating magnetic field;

a transceiver for receiving radio signals and for transmitting collected player information;

a control unit for evaluating received radio signals and assigning timestamps to IDs of received radio signals;

a source of energy; and

a memory for storing and reading out player information based on the IDs with associated timestamps; and

a device for sensing the generated magnetic field in a soccer shoe and for transmitting an ID assigned to the device, comprising

a magnetic field sensor for sensing and measuring the magnetic field;

a control unit; and

a transmitting unit for transmitting a radio signal which contains the ID assigned to the device,

wherein the transmitting unit is actively supplied with energy, and wherein the radio signal is transmitted under control of the control unit.

4. The system according to claim 3 , wherein the generated alternating magnetic field has a frequency of 3 kHz and the radio signal has a carrier frequency of 2.4 GHz.

5. The system according to claim 3 or 4 , which further contains:

a readout device with radio receiver for receiving the collected player information.

6. A method for detecting and providing player information using a sensor at the player side, the method comprising the steps of:

generating, with at least three coils that are electrically actuated, a magnetic field in a game ball, wherein a resulting magnetic field vector rotates in three dimensions, and wherein the frequency at which the resulting magnetic field vector rotates is considerably higher than a rotation frequency of the game ball that is possible during the game;

detecting the magnetic field with a magnetic field sensor of a device mounted in a playing device of a ball game, wherein the playing device can be assigned to a player;

transmitting a radio signal by the device, wherein the radio signal contains an ID assigned to the device; and

receiving the radio signal including the ID in the game ball.

7. The method according to claim 6 , further comprising the steps of:

assigning a timestamp to the ID; and

storing the ID with timestamp.

8. The method according to claim 7 , further comprising the steps of:

measuring the magnetic field strength with the magnetic field sensor,

wherein transmitting a radio signal further comprises transmitting a radio signal by the device, wherein the radio signal contains an ID assigned to the device and the measured magnetic field strength;

analyzing the radio signal, comprising comparing the measured magnetic field strength with measured magnetic field strengths contained in other radio signals which are received in a specific time frame around the reception of the radio signal, and

determining a maximum magnetic field strength for the time frame; and

storing that ID with assigned timestamp that is assigned to the maximum magnetic field strength.

9. The method according to any one of claims 6 to 8 , further comprising the steps of:

determining a contact event by means of a pressure sensor included in the game ball;

transmitting a measurement command by the game ball;

measuring a reference magnetic field strength by the magnetic field sensor in response to the reception of the measurement command;

determining a point in time at which the magnetic field strength measured by the magnetic field sensor has dropped to a specific fraction of the reference magnetic field strength; and

transmitting a radio signal to the game ball, including the ID and a timestamp corresponding to the determined point in time to the game ball.