CA2134471A1

CA2134471A1 - Golf game simulating apparatus and method

Info

Publication number: CA2134471A1
Application number: CA002134471A
Authority: CA
Inventors: James W. Kluttz; Edgar P. Roberts, Jr.
Original assignee: Individual
Current assignee: AccuSport International Inc
Priority date: 1992-04-29
Filing date: 1993-04-29
Publication date: 1993-11-11
Also published as: ATE162409T1; AU670089B2; EP0637979B1; WO1993022011A1; ATE162408T1; WO1993022010A1; KR950701239A; EP0637980A1; JPH07506280A; DE69316609D1; JPH07506281A; US5398936A; DE69316608D1; AU4223293A; AU4223193A; EP0637979A1; US5303924A; EP0637980B1; CA2134470A1; JP3836126B2

Abstract

A golf game apparatus that simulates a total golf shot distance based upon the actual flight time of a struck golf ball at a practice range and the linear flight distance of the ball to an initial impact position on an adjacent target area. The flight time and linear flight distance are used to simulate a roll distance which may be added to the linear distance to thereby produce the simulated golf shot total distance. A distance positioned adjacent the tee area of the practice range may display a simulated golf hole layout with the simulated golf shot total distance indicated thereon for the player. The simulated golf ball roll distance may take into account a predetermined type of golf course surface upon which the struck golf ball initially impacts.

Description

wo 93/22010 213 4 4 71 Pcr/us93/o4o26 GOLF GAME SIMUI~TING APPARATUS AND METHOD
Field ofthe Invention The present invention relates to the field of golf, and more particular~y, ~ an apparatus and method for accurately simulating a golf shot includi~g the roll distance thereof.
Back round of the Invention The sport of golf has enjoyed tremendous popularity in recent times. Unfortunately, in many areas golf courses are overcrowded as new courses cannot be constructed fast enough to meet the surge in demand. As many recreational p~ayers will attest, golf can be a frustrating sport, especially when long waiting times and slow play hamper the player's ability to maintain even a consistent level of skill. Practice outdoor golf ranges are fairly common and serve to permit the player to practice a variety of ~hots with different clubs without the time commitment of playing 18 holes on a golf course. Indoor practice training devices are also available and these indoor facilities can remain open during times of the year when weather restricts play outdoors.
A number of golf practice aids have been developed including interactive video systems primarily for indoor use, such as the Birdie Rush manufactured by Joytec Ltd. of Burnaby, B.C., Canada. The available interactive video systems use sèveral approaches for WO93/22010 ~ 1 3 4 4 7 1 PCr/US93/040~6 ~~;

measuring the estimated speed and angle of the struck golf ball. Unfortunately, the estimated quantities do not predict with sufficient accuracy where a real golf ball would land and come to rest on a real golf course.
As is readily appreciated, wind speed, air temperature, air densi~y, type of grass, type of ball, ball spin, and club affect the actual distance and path of a golf shot. Manufacturers of av-ailable interactive video games readily admit errors of 20%o However, skilled golfers, such as professionals and expert amateurs, can rep~at a shot within 1%. Thus, an inaccurate system has little or no value to a skil~ed player as a golf practice aid. Interactiv~ video systems do, however, offer entertainment for the player. ~or example, famous courses which are otherwise inaccessible may be readily programmed into a memory for display and simulated play. An example of a film-based simulation game is disclosed in U.S. Patent No. 4,437,672 to Wilson. U.S~ Patent No. 3,712,624 to ~0 Conkiin discloses a similar system including a screen for displaying a simulated position on a simulated ~olf - hole layout wherein the tra~ectory of the struck ball is estimated based upon data from sensors positioned adjacent the tee area. ~ ~
Outdoor golf practice ranges are available, and, such ranges include the effects of wind speed, air density, and other related factors on the flight of a struck golf ball which cannot be readily simulated.
However, a golf practice range may be boring relative to the actual play, but is mandatory if improvement is desired.
A golf practice range cannot completely simu}ate actual shots on an 18 hole course. Attempts have been made to either increase the benefit gained by practicing at an outdoor range or to enhance its simulation of an actual golf course. For example, U.S.
Patents Nos. 4,192,510 and 4,283,056, both to Miller, -'j WO93/22010 2 1 3 ~ 4 7 1 PCT/US93/04026 disclose a computer-based video display of a simulated golf hole layout to ~e used in conjunction with an outdoor driving range. The display device is mounted adjacent the tee area of an outdoor practice range.
After the player has executed a shot, the player then vi~ually estimates the distance of the shot from a series of yardage markers on the target area. The player must then manipulate controls on the display device to "locate" ~he position of the shot on the -lO simulated golf hole layout. Such a system, however, i5 more for entertainment than for seriouc practi.ce as it is likely to be very inaccurate while at the same time being unnecessarily complicated for the player.
To increase the value of practice at; a golf practice range, U.S. Patent No. 4,673,183 to Trahan discloses a series of radar detecting units positioned at regular i~ervals and ex~ending in a straight line outward from the tee area to thereby measure the distance of a shot and display the distance on a ~ideo display. The distance of the golf shot is estimated by determining the farthe~t away radar unit from the tee whîch detected the moving ~ol~ ball. However, the system provide only a gross estimate of the shot distance, and for a typical installation where the radar units have a detection range of 40 yards, the accuracy is only àt best within 20 yards.
A substantial improvement in an automated system for measuring the distance of a golf shot at a ! I practice range is disclosed in U.S. Patent No.
5,029,866 to Beard, III et al. and assigned to the assignee of the present invention. An array of microphones or other acoustical detectors are positioned on the target area of the practice range.
The signals generated by several adjacent sensors may 3~ be used to accurately determine the landing point of the struck golf ball by triangulation. The landing position of a golf ball is thus readily and accurately W093~20l0 134~71 PCr/US93/04026 determined. Such information can ~e used to develop information of great benefit to the player. For example, the measured distances may be plotted in graphical form for a particular club, and statistical information, such as a mean distance for that club, may also be readily calculated. Although this system greatly improves the usefulness of golf practice, it measures only the impact location of a golf shot. But, the rolling of the golf ball af~er its initial impact, which may often ~e a signif icant component of the overall shot, is not determinable using the sensors alone~
Summar~l of the Invention The invention provides a golf practice system which can provide gol~ practice information and/or simulated golf play of substantially improved accuracy.
The syst~m of the invention can be used at a golf practice range to provide information and/or a visual display.~representative of a golf shot in which the total distance of the shot, including the roll distance of the golf ball after its initial impact, is provided.
The system of the invention provides an accurate indication of roll distance without requiring wind speed measurements, temperature measurements, vertical flight measurements or the like.
The invention provides an apparatus for use at a.golf practice range which simulates the total distance of a golf shot, including forward roll, based . upon the linear distance from the tee area to the initial impact position of the golf ball on the target area and based on the flight time of the.ball. More particularly, a simulated golf ball roll distance is determined and added to the linear distance from the tee area to the initial impact point on the target area. Because the simulated roll distance is calculated based on both flight distance and flight time, factors such as wind speed, vertical flight -`j` WO93/2~010 2 1 3 ~ 4 7 1 PCT/U~93/04026 distance and ~he like are inherently compensated for without requiring measurement.
The system of the invention includes a sensor associated with the tee area, and preferably positioned adjacent the tee area for sensing a golf ball striking time which, in turn, is representative of the beginning of flight of the strucX golf ball toward the target area. The sensor may be an op~ical de~ector such as a laser raster, a radar based detector, or an acoustic or vibration detector, such as a directional microphone for sensing the triking of the golf ball by the club of the player.
A sensor or an array of sensors is positioned on or adjacent the target area for sensing the initial impact time and initial impact position of the struck golf ball on the target area at the end of its flight.
The ~ensor array ic preferably an array of acou~tic sensors as described in U.S. Patents Nos. 4,898,388 and 5,029,~86 and assigned to the assignee of the present invention, the dis~losures of which are hereby incorporated herein by reference.
A processor, such as a microprocessor operating un~er stored program control, cooperates with the sensors to indicate on a display a simulated golf :2~ shot total distance including a simulated roll distance based upon the fl`ight time of the struck golf ball and.
the initîal impact position on the target area. Thus, a highly accurate simulated golf shot total distance is ; generated which includes the effects of wind speed, air ! 30 density and other local factors at the practice range.
~. The procesæor includes means for determin.~ng ¦ 'the difference between the initial impact time of the struck golf ball on the target area and the striking time of the gol~ ball to thereby determine the flight time of the struck golf ball. The processor also includes means for determining the linear distance of the struck golf ball from the tee area to the initial WO9312~01(~ 2~ 7~ PCI/IJS93/04026 `I

impact position on the target area. The initial impact position of the struck golf ball is preferably determined by triangulation means cooperating with a sensor array on the target area.
The processor further includes means for determining the simulated gol~ ball roll distance based on the flight time and the linear distanc~of the struck golf ball. ~t has been found accor~ing to the ~nvention that a relationship exists between the roll distance, the linear distance of the struck ball, and the flight time of the ball~
In addition, the processor may also include a memory cooperating therewith for storin~ at least one predetermined value relating to a golf ball roll distance on a predetermined type of golf course surface to be used in the formula for simulating the golf ball roll distance. Golf course surface ~ariations can include grass type and/or length, slope and like variations. The memory also preferably includes data represe~ting a simulated golf hole image and the ~;~ processor includes means for displaying the simulated ~: golf hole image on the display with the simulated golf shot total distance indicated thereon.
~he processo~ preferably also includes mèans ~: 25 for storing a series of simulated golf shot`total : distances for a sèries of respective golf shots. Thus, : ~ statiætical information of value to the player may be readily calculated, ~uch as an average distance for a . I given golf club.
The methcd according to the present invention includes the steps of determining the flight time of a struck golf ball from the start of flight until the initial impact on the target area; determining the I linear distance of the struck golf ball from the tee area to the initial impact position on the target area;
and simulating a golf ball roll distance from the flight time and the linear flight distance. As `! WO 93/22010 21 3 ~ 4 71 PCT/US93/04026 described above with respect to the apparatus according to the invention, a simula~ed total golf shot distance may be indicated on a display along with a simulated golf hole layout.
A plurality of simulated total golf shot distances may be stored for a respective plurality of golf shots for later statistical analysis.
Brief Description of the Drawinq~
FIG. 1 is a schematic side elevational view of a practice golf range showing ~he path of a struck golf ball and a path, including ball roll, fo:r a simulated impact point according to the in~ention.
FIG. 2 is a plan view of the practice golf range as shown in FIG. 1 illus~rating the po~itioning of an array of acoustical sensors on the target area and the regions covered thereby.
FIG. 3 is a schematic block diagram of the apparatus according to the present invention for generating an estimated distance of a golf shot.
FI~. 4 îs a view of a display according to the invention showing a simulated golf hole layout and ~: the position of the ball thereon corresponding to a simulated total distance according to the present invention.
: 25 FIG. 5 is a flow draft illustrati~g the steps of generating simulated total distance of a golf shot according to the invention.
: FIG. 6 is a graph illustrating measured roll data versus flight distance and flight time corresponding to the Example.
Detailed Description of the Preferred Embodiments The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set WO93J22010 2 13 4 47 I PCT/USg3/04026 ----`) forth herein. Rather, applicants provide these embodiments ~o that this disclosure will be thorough and complete, and will fully con~ey the scope of the invention to those skilled in the art.
The golf game apparatus ~o according to the present invention is shown in FI~. 1 in~lled at a golf practice range. At the practice range, player 11 trikes a golf ball 12 from a tee area 13. The struck golf ball 12 then travels to an initial impact location on an adjacent target area 1~ where it then rolls a distance, ~, to a stop at its final position.
Associated with the tee area 13 is 21 sensor 16 for determining when the golf ball ~2 has been struck thereby beginning its flight. The sensor 16 may 1~ be an acoustical detector, such as a directional microphone directed ~oward the tee so that the striking of the ball by the club may be detected. The sensor 16 may also be an optical detector positioned adjacent the tee to determine when the golf ball is no longer positioned on the tee thereby indicating that the ball has been struck. It will be apparent that force sensors and/or numerous other sensors can be associated with the tee to determine striking of the ball and/or the time when the ball leaves the tee.
An array of sensors 20, such as acoustical sensors described in U.S~ Patent No. 5,029,886, are positioned on the target area 1~ in a predetermined triangular pattern as shown best in the plan view of FIG. 2. The sensors ~0 permit the initial impact ! 30 position of the struck golf ball 12 to be determined ¦ with high accuracy as described in the patent.
¦ Although an array of sensors, as described above, is preferred in the inYention~ other means for sensing the , impact and impact location of the ball can be employed if desired~
Referring now to FIGS. 3 and 4, a display 22 is positioned adjacent the tee area 13 within view of ~~ WO~3/22010 2 1 3 4 4 7 1 PCT/USg3/04026 ~

_9_ the player ~1~ The display 22 is connected to a processor 24 for generating on the display an image of a golf hole layout 23, as well as indicating thereon a simulated golf shot distance and position 25. The processor 22 î~ preferably a microprocessor, as well known-to those skilled in the art, operating under stored program control. The processor 22 may include a separate memory 2~ as shown or the memory may be included initially within the microprocessor.
Referring to the Flowchart ~0 of FIG. 5, the apparatus and method of the present invention may be understood. After starting the apparatus (B1QCk ~2 ) the player may select at Block 4~ the simulated golf course and/or golf hole layout desired. For example, a famous c~urse, such as Augusta National, the home of the Masters Tournament, may be stored in memory and displayed (Block ~6) on the display 22 one hole at a time as would be`readily understood by those skilled in the art.
The directional microphone 16 (FIG. 1) : associated with the tee area 13 then senses the striking of the golf ball 12 which initiates a flight . timer in the processor 24 at Block ~8. The array of sensors 20 associated with the target area l~ in cooperation with the processor 24 then determine the ~: : initial impact positi~n and stop the timer upon the ~ initial impact of the struck golf ball 12 on the target ! area (81Ock 50). The total flight time is determined at Block S2, as well as the linear flight distance, or distance from the tee area to the initial impact ~ position at Block 5~.
! The simulated roll distance of the struck golf ball is determined at Block 56 based upon a ratio of the linear flight distance to the square of the flight time. More particularly, it has been found according to the invention that there is a close correlation between the logarithm (base lO) of the roll 2~10 PCI/VS93/04026 i~
2~344~

distance and the ratio of the flight distance (Df) to the square of the flight time (T2). A simulated roll distance (R5) may thus ~e accurately calculated from the following formula:
R5 - Antilog ~mdf/T2 + b) where m and b are appropriate prede~ermi-ned values depending on the type of gol~ course su~.face upon which the ball lands. As shown in FIG. 1, the predetermined values may also take into account a sl~pe of the initial impact point. Other factors can also be included such as grass length, course condition and like factors. The simulated roll distance is added to the linear flight distance at Block 62 to yield a total simulated shot distance. As would be readily understood by those skilled in the art, a difference in elevation between the actual impact point and a simulated impact point may also ~e factc~red into the - total simulated distance. The total simulated shot distance includes the effects of external factors, such as the wind speed at the practice range, the air density, etc. ~ecause the actual flight of the ball is influenced by these.
,- , As would be readily understood by those skilled in the art, predetermined values m and b for ~ 2S the calculation of the simulated shot total distance ,~ may be stored in memory 26 and may also be correlated ~ to the initial impact poæition of the st N ck golf ball !; on:the simulated gol~ hole layout 23. For example, if , ,, the struck,golf ball were sliced so that it would have landed in the rough on the simulated golf hole layout, a correspondingly short roll distance would be added to I the linear flight distance. In c~ntrast, if the struck ball was hit straight down the center of golf hole : fairway, a longer simulated roll distance could be ~;: 35 applied.
A series of simulated golf shot total distances can be stored at Block 60 for subsequent `` W093/2tO10 2 1 3 9 ~ 7 1 PCT/US93104026 statistical analysis. The simulate~ gol~ shot total distance can then be used to update the display (Block 62) so that an image of the simulated golf hole layout may be generated from ~he spot at which the simulated golf shot ended. A next sho~ may then be played, starting at Block 48, in a similar fashion.
The following Example is meant to be illustrative of the present invention and not limiting thereof.
EXAMPLE
Measur~d roll distances, and respect:ive flight times and linear flight distances, were obtained for 44 golf shots. Fi~ure 6 shows the calculzlted points representing the logarithm (base lO) of~he l~ measured roll distances plotted versus the ratio of t~e ~~ linear ~light distance to the square of the ~light ti~e.
As shown in FIG. 6, ~ straight line J~ approximation using m = 0-09949 and b = -0.75985 yields 20 a correlation coefficient of o. 874 . It is to be noted that the x-intercept in Figure 6 is a positive number, not zero. Accordingly, it is possible that simulated roll (on the Y-axis) could be a negative value. This : condition accurately reflects possible conditions due to e.g. spin, wind, vertical flight and the like.
Nany modifications and other embodiments of the invention will come to the mind of one skill~d in the art having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed, and that modifications and ~ariations are intended to be included within the spirit and scope of the invention as described in the 3~ foregoing specification and defined in the appended claims.

Claims

THAT WHICH IS CLAIMED IS:

1. An apparatus for use at a golf practice range having a tee area and an adjacent target area, said apparatus comprising:
first sensor means adapted to be associated with the tee area for sensing a golf ball striking time representative of the beginning of flight of the struck golf ball toward the target area;
second sensor means adapted to be associated with the target area for sensing the initial impact time and initial impact position of the struck golf ball on the target area thereby ending its flight;
a display; and a processor operatively connected to said first sensor means, said second sensor means, and said display for indicating on said display a simulated golf shot total distance including a simulated golf ball roll distance based upon the flight time of the struck golf ball and the initial impact position of same on the target area;
whereby a simulated golf shot total distance of improved accuracy is indicated.

2. The apparatus according to Claim 1 wherein said processor comprises:
means for determining the difference between the initial impact time of the struck golf ball on the target area and the striking time of the golf ball to thereby determine the flight time of the struck golf ball;
means for determining the linear flight distance of the struck golf ball from the tee area to the initial impact position on the target area; and means for determining the simulated golf ball roll distance based on the flight time and the linear flight distance of the struck golf ball.

3. The apparatus according to Claim 2 wherein said means for determining the simulated golf ball roll distance comprises means for determining a ratio between the linear flight distance and the square of the flight time.

4. The apparatus according to Claim 1 further comprising a memory operatively connected to said processor for storing data representing a simulated golf hole image; and wherein said processor further comprises means for displaying said simulated golf hole image on said display with the simulated golf shot total distance indicated thereon.

5. The apparatus according to Claim 2 further comprising a memory operatively connected to said processor for storing at least one predetermined value related to a golf ball roll distance on a predetermined type of surface of a golf course; and wherein said means for calculating the simulated golf ball roll distance of the simulated golf shot includes means for calculating same based upon said at least one predetermined value.

6. The apparatus according to Claim 1 wherein said first sensor means comprises an optical sensor.

7. The apparatus according to Claim 1 wherein said first sensor means comprises an acoustical sensor.

8. The apparatus according to Claim 1 wherein said second sensor means comprises an array of spaced apart acoustical sensors adapted to be positioned on the target area.

9. The apparatus according to Claim 8 wherein said processor further comprises triangulation means operatively connected to said array of acoustical sensors for determining the initial impact position of he struck golf ball on the target area.

10. The apparatus according to Claim 1 further comprising a memory operatively connected to said processor for storing a series of simulated golf shot total distances for a series of respective golf shots.

11. An apparatus for use at a golf practice range having a tee area and an adjacent target area, said apparatus comprising:
first sensor means adapted to be associated with the tee area for sensing a golf ball striking time representative of the beginning of the flight of the struck golf ball toward the target area;
second sensor means adapted to be associated with the target area for sensing the initial impact time and initial impact position of the struck golf ball on the target area thereby ending its flight; and a processor operatively connected to said first sensor means and said second sensor means for generating a simulated golf shot roll distance based upon the flight time of the struck golf ball and the initial impact position of same on the target area.

12. The apparatus according to Claim 11 wherein said processor comprises:
means for determining the difference between the initial impact time of the struck golf ball on the target area and the striking time of the golf ball to thereby determine the flight time of the struck golf ball;
means for determining the linear flight distance of the struck golf ball from the tee area to the initial impact position on the target area; and means for determining the simulated golf ball roll distance based on the flight time and the linear flight distance of the struck golf ball.

13. The apparatus according to Claim 12 wherein said means for determining the simulated golf ball roll distance comprises means for determining a ratio between the linear flight distance and the square of the flight time.

14. The apparatus according to Claim 13 further comprising a memory operatively connected to said processor for storing at least one predetermined value related to a golf ball roll distance on a predetermined type of surface of a golf course; and wherein said means for calculating the simulated golf ball roll distance includes means for calculating same based upon said at least one predetermined value.

15. The apparatus according to Claim 11 wherein said first sensor means comprises an optical sensor.

16. The apparatus according to Claim 11 wherein said first sensor means comprises an acoustical sensor.

17. The apparatus according to Claim 11 wherein said second sensor means comprises an array of spaced apart acoustical sensors adapted to be positioned on the target area.

18. The apparatus according to Claim 17 wherein said processor further comprises triangulation means operatively connected to said array of acoustical sensors for determining the initial impact position of the struck golf ball on the target area.

19. A method for simulating a golf shot at a golf practice range having a tee area and an adjacent target area, the method comprising the steps of:
determining the flight time of a struck golf ball from the start of flight until the initial impact on the target area;
determining the linear distance of the struck golf ball from the tee area to the initial impact position on the target area; and simulating a golf ball roll distance from the flight time and the linear flight distance.

20. The method according to Claim 19 further comprising the steps of generating a simulated golf shot total distance and indicating same on a display.

21. The method according to Claim 20 further comprising the step of displaying a simulated golf hole image on the display along with the simulated golf shot total distance.

22. The method according to Claim 21 further comprising the step of storing in a memory a plurality of simulated total golf shot distances for a respective plurality of golf shots.

23. The method according to Claim 20 wherein the step of generating the simulated golf ball roll distance comprises the step of generating same based upon a ratio of the linear distance to the square of the flight time.

24. The method according to Claim 20 wherein the step of determining the initial impact position of the struck golf ball on the target area comprises the step of triangulating inputs from adjacent ones of an array of spaced apart acoustical sensors.

25. The method according to Claim 20 wherein the step of simulating the golf ball roll distance comprises simulating same based upon a predetermined type of golf course surface.