Football sensing
An automated objective American-football evaluation system may include an American-style football, at least one sensor carried by the football, and electronics. The electronics arranged to: (a) receive strings of sensor signals from the at least one sensor, wherein the characteristic of the throw of the football determined by the electronics; and (b) output throw quality. The throw quality is based upon a combination of at least two throw characteristic determined based upon the received string of sensor signals associated with a throw of the football. The at least two throw characteristics are selected from a group of throw characteristics consisting of: velocity; spin rate; time-of-flight; angle of attack; release angle; cone angle; nutation angle; spiral efficiency; and spiral decay.
1. An automated objective American-football evaluation system comprising:
an American-style football;
at least one of sensor carried by the football; and
electronics to: (a) receive strings of sensor signals from the at least one sensor, wherein characteristics of a throw of the football is determined by the electronics; and (b) output a throw quality evaluation, the throw quality evaluation being based upon a combination of at least two throw characteristics determined based upon the strings of sensor signals associated with the throw of the football, the at least two throw characteristics selected from a group of throw characteristics consisting of: velocity; spin rate; time-of-flight; angle of attack; release angle; cone angle; nutation angle; spiral efficiency; and spiral decay and wherein the at least two throw characteristics are differently weighted based upon a type classification of the throw of the football.
2. The evaluation system of claim 1 , wherein the throw quality evaluation comprises a composite metric of arm efficiency, flight efficiency and catchability.
3. The evaluation system of claim 2 , wherein the throw quality evaluation is determined based upon application of one of a plurality of available sets of constants to values for the arm efficiency, the flight efficiency and the catchability based upon the type classification of the throw of the football.
4. The evaluation system of claim 3 , wherein the electronics prompts a person to enter the type classification of the throw of the football.
5. The evaluation system of claim 3 , wherein the electronics prompts a person to enter the type classification of a group of throws of the football based upon a number of throws for the group of throws or a time duration for the group of throws.
6. The evaluation system of claim 3 , wherein the electronics automatically determine the type classification of the throw of the football based upon the received string of sensor signals.
7. The evaluation system of claim 1 , wherein the electronics are to determine flight efficiency of the throw of the football based upon a composite metric of velocity, angle of attack, release angle and spiral efficiency.
8. The evaluation system of claim 7 , wherein the flight efficiency is determined based upon application of one of a plurality of available sets of constants to values for the velocity, the angle of attack, the release angle and the spiral efficiency based upon a type classification of the throw of the football.
9. The evaluation system of claim 8 , wherein the electronics prompt a person to enter the type classification of the throw of the football.
10. The evaluation system of claim 8 , wherein the electronics prompt a person to enter the type classification of a group of throws of the football based upon a number of throws for the group of throws or a time duration for the group of throws.
11. The evaluation system of claim 8 , wherein the electronics automatically determine the type classification of the throw of the football based upon the received string of sensor signals.
12. The evaluation system of claim 1 , wherein the electronics are to determine the angle of attack of the throw of the football based upon an amplitude of an x axis wave signal in the received strings of sensor signals corresponding to the throw the football.
13. The evaluation system of claim 1 , wherein the electronics are to determine the cone angle of the throw of the football based upon a combination of an amplitude of an x axis wave signal and a z axis wave signal in those received strings of sensor signals corresponding to the throw of the football.
14. The evaluation system of claim 1 , wherein the electronics are to determine spiral decay of the throw of the football based upon a composite of changes in a spin rate of the football and changes in a wobble of the football over time as determined from the received string of sensor signals during the throw.
15. The evaluation system of claim 1 , wherein the electronics are to further output a thrown ball catchability of the throw of the football by determining an endpoint of the throw of the football, wherein the thrown ball catchability is based upon a composite of at least two of: velocity, distance, spiral efficiency, spin rate, and spiral decay as determined from just those portions of the strings of sensor signals received during the throw immediately preceding the determined endpoint of the throw.
16. The evaluation system of claim 15 , wherein the thrown ball catchability is based upon a composite of at least two of: velocity, distance, spiral efficiency, spin rate, and spiral decay as determined from just those portions of the strings of sensor signals received during the throw that are within 0.4 seconds from the determined endpoint of the throw.
17. An apparatus comprising:
a transceiver to receive a string of sensor signals from at least one sensor carried by a football;
a processor connected to the transceiver to receive the string of sensor signals; and
a non-transitory computer-readable medium containing instructions to direct the processor to output a throw quality evaluation, the throw quality evaluation being based upon a combination of at least two throw characteristics determined based upon the string of sensor signals associated with a throw of the football, the at least two throw characteristic selected from a group of throw characteristics consisting of: velocity; spin rate; time-of-flight; angle of attack; release angle; cone angle; nutation angle; spiral efficiency; and spiral decay and wherein the at least two throw characteristics are differently weighted based upon a type classification of the throw of the football.
18. The apparatus of claim 17 , wherein the throw quality evaluation comprises a composite metric of arm efficiency, flight efficiency and catchability.
19. The apparatus of claim 18 , wherein the throw quality evaluation is determined based upon application of one of a plurality of available sets of constants to values for the arm efficiency, flight efficiency and catchability based upon a type classification of the throw of the football.
20. The apparatus of claim 17 , wherein the processor is to further output a thrown ball catchability evaluation of the throw of the football by determining an endpoint of the throw of the football, wherein the thrown ball catchability is based upon a composite of at least two of: velocity, distance, spiral efficiency, spin rate, and spiral decay as determined from just those portions of the string of sensor signals received during the throw immediately preceding the determined endpoint of the throw.