JP2012052845A - Measuring device and measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure speeds of both a hitting tool and an object to be hit more accurately.SOLUTION: A Doppler sensor 11a receives a first Doppler signal which is reflection of a first transmission signal sent by the Doppler sensor 11a off a hitting tool. A Doppler sensor 11b receives a second Doppler signal which is reflection of a second transmission signal sent by the Doppler sensor 11b off an object to be hit. A microphone 14 detects a hitting timing which is a moment that the hitting tool hits the object to be hit. A calculation section 32 of a data processing device 2 calculates speed of the hitting tool based on the first Doppler signals received during a lapse of a predetermined period until the hitting timing, as well as speed of the object to be hit based on the second Doppler signals received during the lapse of the predetermined period after the hitting timing. The present invention can be applied, for example, to a measuring device to measure the speed of a golf club as the hitting tool and of a golf ball as the object to be hit.

Description

  The present invention relates to a measuring apparatus and a measuring method, and more particularly, to a measuring apparatus and a measuring method that can more accurately measure the velocity of both a hit object and a hit object.

  In sports such as baseball, golf, tennis, and soccer, for example, measuring the speed of a hitting object such as a bat used by a player, a golf club, a tennis racket, or a player's leg in soccer is the power of the player. It is important in the sense of measuring the ability. It is also important to measure the speed of hit objects such as baseballs, golf balls, tennis balls, soccer balls, etc. in terms of measuring the quality of hits (shots) made by players, that is, performance levels. is there.

  Therefore, it can be said that measuring the speed of the hit object and the hit object at the same time in sports is a basic measurement, which is important for improving the skill in each competition. These measuring methods include various methods such as a method using an image, a method using a magnetism, a method using an optical sensor, and a method using a Doppler sensor. Therefore, many methods using a Doppler sensor are used.

  For example, there is one that measures the speed of a club head when swinging in golf using a Doppler sensor (see, for example, Patent Document 1). In addition, there is a technique that measures both the speed (head speed) of a club head as a hit object in golf and the speed (ball speed) of a golf ball as an hit object using a Doppler sensor (for example, Patent Document 2). reference).

JP 2006-326318 A JP 2010-025737 A

  However, in the measurement method disclosed in Patent Document 2, the club head speed and the golf ball speed are measured based on the Doppler signal acquired by one Doppler sensor. In this case, it is important that the Doppler signal acquired from one Doppler sensor can be properly separated into a signal on the club head side and a signal on the golf ball side. It is difficult to separate accurately. As a result, the club head and golf ball speed may not be accurately measured.

  This invention is made | formed in view of such a condition, and makes it possible to measure the speed of both a hit | damage thing and a to-be-hit | worked object more correctly.

  A measuring apparatus according to an aspect of the present invention outputs a first transmission signal and receives a first Doppler signal that is a signal returned from the first transmission signal after being reflected by a striking object. A Doppler sensor; a second Doppler sensor that outputs a second transmission signal and receives a second Doppler signal that is a signal that the second transmission signal is reflected back to the hit object; and Timing detection means for detecting an impact timing which is the moment when the hit object is hit by the hit object, and the first Doppler signal from the impact timing detected by the timing detection means to a time before a predetermined period. The speed of the hit object is calculated based on the second Doppler signal from the hit timing to a time after a predetermined period. And a calculation means.

  A measurement method according to one aspect of the present invention is a measurement method of a measurement apparatus including a first Doppler sensor, a second Doppler sensor, a timing detection unit, and a calculation unit, and the first Doppler sensor includes: The first transmission signal is output, and the first transmission signal is received by reflecting the first transmission signal back to the striking object, and the second Doppler sensor receives the second transmission signal. A transmission signal is output, and a second Doppler signal, which is a signal returned from the second transmission signal reflected by the hit object, is received, and the timing detection means detects that the hit object is the hit object. The timing of hitting, which is the moment of hitting, is detected, and the calculating means is based on the first Doppler signal from the hit timing detected by the timing detecting means to a time before a predetermined period. Thereby calculating a speed of the hitting object Te, calculates the speed of the struck object based on the second Doppler signal from the striking timing to the time after a predetermined period.

  In one aspect of the present invention, a first transmission signal is output, a first Doppler signal that is a signal returned from the first transmission signal after being reflected by the striking object is received, and a second transmission signal is received. A signal is output, and a second Doppler signal that is a signal returned from the second transmission signal after being reflected by the hit object is received. Then, the hit timing, which is the moment when the hit object is hit with the hit object, is detected, and the velocity of the hit object is calculated based on the first Doppler signal from the detected hit timing to the time before the predetermined period. At the same time, the speed of the hit object is calculated based on the second Doppler signal from the hit timing to the time after a predetermined period.

  According to one aspect of the present invention, it is possible to more accurately measure the velocity of both the hit object and the hit object.

It is a block diagram which shows the structural example of one Embodiment of the measurement system to which this invention is applied. It is a figure which shows the example of arrangement | positioning of the measurement system of FIG. It is a figure explaining the relationship between two Doppler sensors in a measuring device, and its measurement range. It is a flowchart explaining the measurement process by impact measurement mode. It is a block diagram which shows the structural example of one Embodiment of the computer to which this invention is applied.

[Example of measurement system configuration]
FIG. 1 shows a configuration example of an embodiment of a measurement system to which the present invention is applied.

  The measurement system of FIG. 1 includes a measurement device 1, a data processing device 2, and an imaging device 3, and when a player (subject) swings a golf club and hits a golf ball placed at a predetermined position. This is a system for simultaneously measuring the speed of a golf club that is a hit object and the speed of a golf ball that is a hit object.

  1 includes an impact measurement mode (first measurement mode) for measuring and displaying the velocity of the golf club and the golf ball at the moment when the golf ball is hit by the golf club, and the golf club and the golf ball. In addition to the speed measurement, a measurement mode with an image (second measurement mode) for capturing and displaying an image of the entire swing motion of the player is also provided.

The measuring device 1 includes two Doppler sensors 11, two comparators 12, and two ADCs (A / D converters) 13. The Doppler sensor 11 outputs a microwave signal as a transmission signal, and the output transmission signal is reflected by a predetermined object and the frequency is changed to obtain a reflection signal (hereinafter referred to as a Doppler signal) having a predetermined Doppler frequency. ). The frequency of the transmission signal output from the Doppler sensor 11 is 24.11 GHz, for example. The comparator 12 compares the output level of the Doppler signal received by the Doppler sensor 11 with a preset reference level _VTH, and detects the object to be measured when the output level is equal to or higher than the reference level _VTH . The detection signal K1 or K2 is output. The ADC 13 AD-converts the Doppler signal output from the Doppler sensor 11 with a predetermined number of bits (for example, 16 bits), and outputs a digitized Doppler signal SIG1 or SIG2 after AD conversion.

  One of the two Doppler sensors 11, the comparator 12, and the ADC 13 is for detecting the speed of the golf club, and the other is for detecting the speed of the golf ball. Of the two Doppler sensors 11 and the comparators 12 and ADCs 13 that receive the outputs, whether the speed of the golf club or the golf ball is detected is determined by whether the player is right-handed (right-handed) or left It depends on whether you are left-handed. That is, when the player is right-handed, the Doppler sensor 11a, the comparator 12a, and the ADC 13a detect the speed of the golf club, and the Doppler sensor 11b, the comparator 12b, and the ADC 13b detect the speed of the golf ball. The opposite is true if the player is left-handed.

  In the following, assuming that the right-handed player is set, the Doppler sensor 11a that detects the speed of the golf club is referred to as a club-side sensor 11a, and the Doppler sensor 11b that detects the speed of the golf ball is referred to as the ball-side sensor 11b. Called. Differences in the case of setting for a left-handed player will be described as necessary.

  The measuring apparatus 1 also includes a microphone 14, a buffer memory 15, a switching unit 16, a display unit 17, a control unit 19, and an input / output unit 20.

  The microphone 14 obtains an audio signal M when the golf ball as the hit object is hit by the golf club as the hit object, so that the moment of impact, that is, the golf ball as the hit object is the hit object. The timing of the moment of being hit by a certain golf club is detected.

  The buffer memory 15 controls the Doppler signal SIG1 output from the club-side sensor 11a and the Doppler signal SIG2 output from the ball-side sensor 11b according to the control of the control unit 19 with predetermined data corresponding to a preset measurement time. Remember only the amount. The buffer memory 15 has a club data area for storing the Doppler signal SIG1 and a ball data area for storing the Doppler signal SIG2, and at least the club data area is a ring buffer. That is, the Doppler signal SIG1 is written in the club data area in order from the smallest address, for example, and when all the data areas are written, the oldest data (that is, from the smallest address) is written. ) By overwriting again, the latest Doppler signal SIG1 of a certain amount (a certain time) is stored in the club data area.

  The switching unit 16 is configured by, for example, a DIP switch or the like, and switches operation settings for a right-handed player and a left-handed player. The operation setting for the right-handed player and the left-handed player may be switched based on a control signal supplied from the data processing device 2 via the input / output unit 20. In this case, the switching unit 16 can be omitted.

  The display unit 17 includes three LEDs 18 a to 18 c and turns on or off the LEDs 18 a to 18 c based on a control signal from the control unit 19. The first LED 18a is lit when the club side sensor 11a detects an object (golf club). The second LED 18b is lit when an impact is detected. The third LED 18c is lit when the club-side sensor 11a detects an object (golf club) and an impact is detected within a predetermined time from the object detection. In other words, the third LED 18c is turned on when the second LED 18b is turned on for a predetermined time after the first LED 18a is turned on. The lighting of the third LED 18c means that measurement data for obtaining the speeds of both the golf club and the golf ball is accumulated in the buffer memory 15.

  Note that the three LEDs 18a to 18c may be blinking or the like instead of lighting. In addition, a control signal for controlling lighting of the three LEDs 18a to 18c may be transmitted to the data processing device 2, and a display similar to the LEDs 18a to 18c may be displayed on the display unit 34 described later of the data processing device 2. . In this case, the display unit 17 is omitted.

  The control unit 19 controls the Doppler signals SIG1 and SIG2. That is, the control unit 19 starts from the time when the detection signal K1 indicating that the object (golf club) has been detected from the comparator 12a is supplied to the buffer memory 15 (the club data area) of the Doppler signal SIG1 supplied from the ADC 13a. Start writing. Then, the control unit 19 finishes writing the Doppler signal SIG1 to the buffer memory 15 when the impact moment is detected by the audio signal M from the microphone 14 within a predetermined time after the detection signal K1 is supplied. (Stop), and starts writing the Doppler signal SIG2 supplied from the ADC 13b to the buffer memory 15 (the ball data area). After a predetermined time has elapsed from the start of writing of the Doppler signal SIG2 to the buffer memory 15, the writing of the Doppler signal SIG2 to the buffer memory 15 is ended (stopped) by the control unit 19. The Doppler signals SIG1 and SIG2 stored in the buffer memory 15 are output to the data processing device 2 via the input / output unit 20 in response to a request from the data processing device 2.

  Further, the control unit 19 switches the input / output control operations of the Doppler signals SIG1 and SIG2 based on the switching signal for switching the right-handed operation and the left-handed operation setting from the switching unit 16. That is, when the operation setting for the right-handed player is set, the control unit 19 detects the first measurement target golf club by the Doppler sensor 11a. Writing to the buffer memory 15 is started from the time when the detection signal K1 indicating that the golf club is detected is supplied. On the other hand, when the operation setting for the left-handed player is made, the first measurement target golf club is detected by the Doppler sensor 11b, so that a detection signal indicating that the object (golf club) has been detected from the comparator 12b. Writing to the buffer memory 15 is started from the time when K2 is supplied.

  Therefore, when the operation setting for the right-handed player is made, the comparator 12a is used to detect the golf club, but the comparator 12b is not used. On the contrary, when the operation setting for the left-handed player is made, the comparator 12b is used for detecting the golf club, but the comparator 12a is not used. Therefore, the number of comparators 12 may be one, and the outputs of the Doppler sensors 11a and 11b may be switched as necessary as inputs of the comparator 12.

  Further, the control unit 19 controls lighting of the LEDs 18 a to 18 c of the display unit 17. Specifically, first, when the club side sensor 11a detects an object (golf club), that is, the control signal 19 is supplied with the detection signal K1 from the comparator 12a, the control unit 19 detects the Doppler signal SIG1 of the club side sensor 11a. When writing is started, the LED 18a is turned on. Second, the control unit 19 turns on the LED 18b when an audio signal M obtained by hitting a golf ball with a golf club is acquired. Furthermore, when the detection signal K1 is supplied and the audio signal M is acquired, in other words, when the writing of the Doppler signal SIG2 of the ball-side sensor 11b is started, the control unit 19 turns on the LED 18c. When the control unit 19 outputs the measurement data (Doppler signals SIG1 and SIG2) accumulated in the buffer memory 15 to the data processing device 2, the control unit 19 turns off the LEDs 18a to 18c.

  As described above, the measurement data is obtained by lighting the LEDs 18a to 18c corresponding to the writing of the Doppler signal SIG1 of the club side sensor 11a, the detection of the moment of impact, and the writing of the Doppler signal SIG2 of the ball side sensor 11b. It is easy to understand at a glance whether or not it was successfully acquired.

  The data processing device 2 includes a communication unit 31, a calculation unit 32, a display control unit 33, and a display unit 34. The data processing device 2 can be composed of, for example, a personal computer.

  The communication unit 31 exchanges data with the measurement device 1 and the imaging device 3 in a predetermined data format. Specifically, the communication unit 31 acquires measurement data (Doppler signals SIG1 and SIG2) supplied from the measurement device 1, supplies the measurement data to the calculation unit 32, and further from the imaging device 3 in the measurement mode with an image. The supplied moving image data obtained by photographing the swing motion of the player is also acquired and supplied to the display control unit 33. In addition, the communication unit 31 transmits a control command supplied from the display control unit 33 to the measurement device 1 or the imaging device 3.

The calculation unit 32 calculates and determines the speed of the golf club and the speed of the golf ball based on the measurement data acquired from the measurement device 1 via the communication unit 31. The velocity v of the golf club and golf ball can be obtained by the following Doppler effect formula.
v = (c · F _d ) / (2 · F _t )
Here, c is the speed of light (299792485 m / s), F _d is the frequency (Doppler frequency) of the received Doppler signal SIG1 or SIG2, and F _t is the output frequency of the Doppler sensor 11.

  In the impact measurement mode, the display control unit 33 causes the display unit 34 to display both the golf club speed and the golf ball speed calculated by the calculation unit 32. In the measurement mode with an image, the display control unit 33 adds the golf club speed and the golf ball obtained by the calculation unit 32 to the moving image of the swing motion of the player acquired from the imaging device 3 via the communication unit 31. The speed is superimposed and displayed on the display unit 34.

  In the measurement mode with an image, for example, a timing signal (audio signal M) indicating that an impact has been detected is supplied from the control unit 19 of the measurement device 1 to the data processing device 2 via the input / output unit 20. At this time, the input / output unit 20 outputs a timing signal to the data processing device 2 and simultaneously starts a counting operation by the internal counter. The display control unit 33 of the data processing device 2 acquires a timing signal via the communication unit 31 and recognizes that an impact has been detected. The display control unit 33 reads the count value of the input / output unit 20 and determines the delay amount due to communication ( Time difference from when the input / output unit 20 outputs the timing signal to when the display control unit 33 recognizes it). And the display control part 33 makes the image imaged with the imaging device 3 the image at the time of impact at the time which got back by the delay amount from the time which received the timing signal. Thereby, it is possible to accurately specify the image at the time of impact from the moving images of the entire swing motion imaged by the imaging device 3, and the display control unit 33 sets a predetermined number of images before and after the image at the time of impact. The captured image is displayed on the display unit 34 as a moving image of the entire swing operation.

  In addition to the golf club speed and the golf ball speed, the display control unit 33 divides the golf ball speed (ball speed) [m / s] by the golf club speed (head speed) [m / s]. The meet rate obtained in this way can also be displayed on the display unit 34. Furthermore, the display control unit 33 may also display a standard golf ball flight distance obtained by a predetermined calculation formula using the ball speed. The flight distance of a standard golf ball can be calculated as, for example, (ball speed [m / s] × 3.8) [yard].

  The display unit 34 is configured by, for example, a liquid crystal display, and displays the speed of the golf club and the speed of the golf ball in the impact measurement mode. In the measurement mode with image, the display unit 34 displays a moving image of the swing motion of the player in addition to the speed of the golf club and the speed of the golf ball.

  When the speed of the calculation result is exactly the same as the previous calculation result, it may not be known whether the previous measurement display is maintained or the result is newly measured. Therefore, when displaying the latest measurement result, the display of the measurement result may be updated by blinking the measurement result for the first predetermined time.

  The imaging device 3 is composed of a video camera or a video still camera that can capture a moving image. In the measurement mode with an image, the imaging device 3 captures an image under the control of the data processing device 2, and the resulting moving image data is a data processing device. 2 is supplied. The moving image data supplied from the imaging device 3 to the data processing device 2 includes the shooting time of each image constituting the moving image as metadata. Note that the imaging device 3 can be omitted when used only in the impact measurement mode.

[Measurement system layout example]
FIG. 2 is a diagram showing a positional relationship between the measurement system of FIG. 1 and the golf ball and the player when viewed from above. FIG. 2 shows an example in which the player is right-handed (right-handed).

  When the player (leg) 41 is positioned with the golf ball 42 in front, the measuring device 1 is disposed at a position on the straight line connecting the player 41 and the golf ball 42 and away from the golf ball 42. The imaging device 3 is arranged at a position farther away from the measuring device 1. In other words, the player 41, the golf ball 42, the measuring device 1, and the imaging device 3 are arranged on a substantially straight line in that order.

  The imaging device 3 is fixed by a tripod 43, and the data processing device 2 is connected to the measurement device 1 and the imaging device 3 by USB cables 44 and 45, respectively. In addition, the connection method between the data processing device 2 and the measuring device 1 and the imaging device 3 can be various connections regardless of wired or wireless, such as RS-232C, LAN, Bluetooth (registered trademark), and infrared communication. The method can be adopted.

  In this embodiment, the data processing device 2 and the imaging device 3 are provided separately. However, for example, when a personal computer as the data processing device 2 has a camera as the imaging device 3, etc. The data processing device 2 and the imaging device 3 can be configured as one device.

[Relationship between Doppler sensor 11 and measurement range]
Next, with reference to FIG. 3, the relationship between the two Doppler sensors 11 in the measuring apparatus 1 and the measurement range will be described.

  The straight line connecting the microphone 14 and the golf ball 42 in the measuring apparatus 1 and the straight line connecting the two Doppler sensors 11a and 11b are orthogonal to each other on the straight line connecting the two Doppler sensors 11a and 11b and the two Doppler sensors 11a. And 11b are arranged in the middle. Accordingly, the two Doppler sensors 11 a and 11 b are arranged symmetrically with respect to a straight line connecting the golf ball 42 and the microphone 14.

  In the present embodiment, it is assumed that the microwave radiation angles of the Doppler sensors 11a and 11b are, for example, 80 degrees. As shown in FIG. 3, the Doppler sensor 11a has a fan-shaped measurement range of 80 degrees from the position where the golf ball 42 is placed to the direction opposite to the flying direction of the golf ball 42 (the rear side in the flying direction). It is arranged to face. On the other hand, the Doppler sensor 11b is arranged so that the 80-degree fan-shaped measurement range faces in the same direction as the flying ball direction from the position where the golf ball 42 is placed.

  In such a positional relationship, when the player is right-handed, the Doppler sensor 11a functions as a sensor for measuring the speed (head speed) of the golf club until the golf ball 42 is hit, and the Doppler sensor 11b. Functions as a sensor for measuring the speed (ball speed) of the golf ball 42 after being hit with the golf ball 42.

  On the other hand, when the player is left-handed, the Doppler sensor 11 b functions as a sensor for measuring the speed of the golf club until the golf ball 42 is hit, and the Doppler sensor 11 a is hit with the golf ball 42. It functions as a sensor for measuring the speed of the golf ball 42 after.

  In this way, by arranging the Doppler sensor 11 for measuring the speed of the golf club and the Doppler sensor 11 for measuring the speed of the golf ball separately so as to separate the measurement range, one Doppler is provided. It is not necessary to separate the golf club measurement data and the golf ball measurement data from the case where the club head and the golf ball speed are obtained from the Doppler signal of the sensor 11, and the measurement data of one of the golf club and the golf ball is not required. Is not erroneously calculated as the other measurement data, the speed of the golf club and golf ball can be measured more easily and accurately.

  In the example shown in FIG. 3, the distance between the golf ball 42 and the measuring device 1 is set to 300 mm, but the distance between the golf ball 42 and the measuring device 1 is appropriately about 300 to 600 mm.

[Measurement processing by impact measurement mode]
Next, measurement processing in the impact measurement mode will be described with reference to the flowchart of FIG. It is assumed that the operation setting in the impact measurement mode has already been performed before the start of this process. Further, the Doppler sensors 11a and 11b start outputting microwaves when the measuring apparatus 1 is turned on.

  First, in step S1, the control unit 19 determines whether the club side sensor 11a has detected an object, that is, a golf club. Specifically, it is determined whether or not the detection signal K1 is supplied from the comparator 12a, thereby determining whether or not the club-side sensor 11a has detected a golf club, and in step S1 until it is determined that the golf club has been detected. The determination process is repeated.

  If it is determined in step S1 that the club-side sensor 11a has detected a golf club, the process proceeds to step S2, and the control unit 19 turns on the first LED 18a and starts counting time.

  In step S3, the control unit 19 starts saving (writing) the Doppler signal of the club-side sensor 11a supplied by being digitized by the ADC 13a to the buffer memory 15. The Doppler signal of the club side sensor 11 a is written in the club data area in the buffer memory 15.

  In step S <b> 4, the control unit 19 determines whether the golf ball hitting sound is detected within a predetermined time after the club-side sensor 11 a detects the golf club. More specifically, the control unit 19 determines whether the audio signal M that the golf club hit the golf ball is supplied from the microphone 14 until the count started in step S2 reaches a predetermined count. .

  If it is determined in step S4 that the golf ball hitting sound has not been detected within the predetermined time, the process proceeds to step S5, and the control unit 19 sends the Doppler signal of the club side sensor 11a to the buffer memory 15. The storage is terminated, and in step S6, the first LED 18a that is lit is extinguished, and the measurement process is terminated.

  Therefore, in the measurement process of FIG. 4, if no golf ball hitting sound is detected within a predetermined time after the golf club is detected by the club-side sensor 11a, the measurement is not performed.

  On the other hand, if it is determined in step S4 that the hitting sound of the golf ball has been detected within a predetermined time, the process proceeds to step S7, and the control unit 19 turns on the second and third LEDs 18b and 18c.

  In step S8, the control unit 19 finishes storing the Doppler signal of the club side sensor 11a in the buffer memory 15 (club data area thereof), and digitizes the supplied ball side sensor 11b supplied by the ADC 13b. Storage (writing) of the Doppler signal into the buffer memory 15 is started. The Doppler signal of the ball side sensor 11 b is written in the ball data area in the buffer memory 15.

  In step S9, the control unit 19 determines whether a predetermined amount of measurement data is stored in the ball data area, and repeats the processing until it is determined that the predetermined amount of measurement data is stored. In step S9, it is determined that a predetermined amount of measurement data has been saved when writing to all of the ball data area is completed by the Doppler signal supplied from the ball-side sensor 11b via the ADC 13b. Alternatively, it may be determined that a predetermined amount of measurement data has been stored after a lapse of a predetermined time from the start of writing to the ball data area.

  If it is determined in step S9 that a predetermined amount of measurement data has been stored, the process proceeds to step S10, and the control unit 19 transfers the Doppler signal of the ball-side sensor 11b to the buffer memory 15 (the ball data area). Finish saving.

  In step S <b> 11, the control unit 19 notifies the data processing device 2 of the completion of measurement via the input / output unit 20. The display control unit 33 of the data processing device 2 that has received the measurement completion notification via the communication unit 31 transmits a data request (command) for requesting measurement data to the measurement device 1 in step S12.

  In step S <b> 13, the control unit 19 of the measuring device 1 receives the data request from the data processing device 2, and uses the measurement data stored in the club data area and the ball data area of the buffer memory 15 as the data processing apparatus. Forward to 2.

  In step S14, the control unit 19 turns off the first to third LEDs 18a to 18c.

  In step S15, the calculation unit 32 of the data processing apparatus 2 that has received the measurement data via the communication unit 31 calculates the speed of the golf club based on the measurement data in the club data region, and measures the ball data region. The speed of the golf ball is calculated based on the data. The calculation result is supplied from the calculation unit 32 to the display control unit 33.

  In step S <b> 16, the display control unit 33 displays the golf club speed and the golf ball speed, which are the calculation results, on the display unit 34, and ends the process.

  As described above, in the measurement process in the impact measurement mode, measurement data (Doppler signals SIG1 and SIG2) for a predetermined period before and after the moment of impact, that is, the moment when the golf ball hitting sound by the golf club is detected is acquired and acquired. Based on the measured data, the speed of the golf club and the speed of the golf ball are obtained.

  The golf club speed (head speed) reaches the highest speed immediately before hitting the golf ball, and the golf ball speed (ball speed) reaches the highest speed immediately after the golf club hits the golf ball. Therefore, by detecting the impact sound of the golf ball by the golf club, the moment of impact is detected, and the speed is obtained based on the measurement data for a predetermined period before and after the impact, so that highly accurate measurement can be performed.

  When the moment of impact is detected, if it is detected that the ball is hit using only an audio signal, it may react to unrelated sounds other than the golf ball hitting by the golf club. On the other hand, detecting the moment of impact by analyzing the Doppler signal requires an expensive processor because it needs to be obtained with high accuracy in a short time, and is not practical in terms of cost. Therefore, in the present embodiment, the golf ball is detected within a predetermined time from when the detection signal K1 indicating that the object is detected is supplied from the comparator 12a, that is, within a predetermined time from the time when the club-side sensor 11a detects the golf club. By determining whether or not the hitting sound has been detected, the moment of impact is specified more accurately than when the detection is performed using only the audio signal without using an expensive processor. That is, according to the measurement system of FIG. 1, the speed of the golf club and the speed of the golf ball can be obtained at a lower cost and with higher accuracy.

  In the conventional measurement of the speed of the golf club and the golf ball, a memory area for storing all of a series of swing motions of the player and the entire flying time of the golf ball has been secured and stored. On the other hand, the measurement system of FIG. 1 can accurately specify the moment of impact as described above, so that only the memory capacity necessary for the calculation of speed for a predetermined period before and after the moment of impact is stored in memory. An area should be secured and stored. Therefore, the memory area required as the buffer memory 15 can be set to the minimum size that can accurately measure the speed of the golf club and the golf ball. For example, when storing measurement data for 0.2 seconds before and after impact (total of 0.4 seconds), a memory area of 32 Kbytes is sufficient.

[Modification of this embodiment]
In the embodiment described above, the microphone for detecting the sound at the time of impact is employed as the detection means for detecting the moment of impact. However, the present invention is not limited to this, and other devices can be employed. For example, when a line sensor camera is employed as a detecting means for detecting the moment of impact, and the line sensor camera images a golf ball placed at a predetermined position, the captured image changes, that is, the image is captured. The case where the golf ball disappears from the captured image can be detected as the moment of impact. In addition, a transmissive or reflective laser sensor is used as a detection means for detecting the moment of impact, and the golf ball is irradiated with laser light, and the presence or absence of the transmitted laser light is reflected. The moment of impact may be detected based on the presence or absence of laser light.

  Further, in the above-described embodiment, in the measurement mode with an image, the speed of the golf club and the speed of the golf ball only at the moment of impact are superimposed and displayed on the moving image of the entire swing motion of the player. The speed of the golf club at each position during the swing operation may be displayed in conjunction with the entire moving image. Further, the speed of the golf club and the speed of the golf ball at each position during the swing operation may be displayed as time series data with the horizontal axis representing time and the vertical axis representing speed. In this case, it is necessary to secure a memory area in the buffer memory 15 for storing all measurement data during the swing operation.

  In the above-described embodiment, since power can be supplied from the data processing device 2 to the measuring device 1 via the USB cable 44, the measuring device 1 itself needs to include a power source such as a battery or a battery (rechargeable battery). However, the measuring apparatus 1 may be provided with a battery or the like without being connected to the data processing apparatus 2. In this case, data exchange between the measuring device 1 and the data processing device 2 is performed by wireless communication or provided with a semiconductor memory or the like that can be attached to and detached from the measuring device 1, and the measurement data stored in the semiconductor memory is stored as data. It can be performed by being read by the processing device 2.

  In the example described above, the measuring device 1 and the data processing device 2 are provided separately, but the measuring device 1 and the data processing device 2 may be configured as one device. For example, only the impact measurement mode is provided, and the display unit 34 that displays the speed is configured to be small, so that the portable device can be a small portable device that combines the measurement device 1 and the data processing device 2. It is.

  In the embodiment described above, the example of measuring the speed of the golf club that is a hit object in golf and the speed of the golf ball that is the hit object has been described. However, the measurement system of FIG. And can be used to measure the speed of the hit object. For example, measurement of the speed of a bat that is a hit in baseball and the speed of a baseball that is a hit, measurement of the speed of a player's leg that is a hit in football (soccer) and the speed of a soccer ball that is hit, tennis Can be used for measuring the speed of a tennis racket that is a hitting object and a tennis ball that is a hitting object. However, the speed of the hit object is limited to the speed when moving from a state where it is stationary at a predetermined position.

[Computer hardware configuration example]
The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. Here, the computer includes, for example, a general-purpose personal computer capable of executing various functions by installing various programs by installing a computer incorporated in dedicated hardware.

  FIG. 5 is a block diagram showing a hardware configuration example of a computer (personal computer) that executes the above-described series of processing by a program.

  In a computer, a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, and a RAM (Random Access Memory) 103 are connected to each other via a bus 104.

  An input / output interface 105 is further connected to the bus 104. An input unit 106, an output unit 107, a storage unit 108, a communication unit 109, and a drive 110 are connected to the input / output interface 105.

  The input unit 106 includes a keyboard, a mouse, a microphone, and the like. The output unit 107 includes a display, a speaker, and the like. The storage unit 108 includes a hard disk, a nonvolatile memory, and the like. The communication unit 109 includes a network interface or the like. The drive 110 drives a removable recording medium 111 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  The imaging unit 121 includes an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Mental Oxide Semiconductor) sensor. The imaging unit 121 images a subject and supplies image data of the captured subject to the CPU 101 or the like via the input / output interface 105.

  In the computer configured as described above, the CPU 101 loads, for example, the program stored in the storage unit 108 to the RAM 103 via the input / output interface 105 and the bus 104 and executes the program. Is performed.

  The program executed by the computer (CPU 101) can be provided by being recorded on a removable recording medium 111 as a package medium, for example. The program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  In the computer, the program can be installed in the storage unit 108 via the input / output interface 105 by attaching the removable recording medium 111 to the drive 110. Further, the program can be received by the communication unit 109 via a wired or wireless transmission medium and installed in the storage unit 108. In addition, the program can be installed in the ROM 102 or the storage unit 108 in advance.

  The program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  In the present specification, the term “system” represents the entire apparatus constituted by a plurality of apparatuses.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 Measurement apparatus, 2 Data processing apparatus, 3 Imaging apparatus, 11a, 11b Doppler sensor, 12a, 12b Comparator, 13a, 13b ADC, 14 Microphone, 15 Buffer memory, 17 Display part, 18a thru | or 18c LED, 19 Control part, 32 Calculation unit, 33 Display control unit, 34 Display unit

Claims (7)

A first Doppler sensor that outputs a first transmission signal and receives a first Doppler signal that is a signal returned from the first transmission signal reflected from the striking object;
A second Doppler sensor that outputs a second transmission signal and receives a second Doppler signal, which is a signal that is reflected back to the hit object, and the second transmission signal;
Timing detection means for detecting a hit timing which is a moment when the hit object is hit by the hit object;
The speed of the hit object is calculated based on the first Doppler signal from the hit timing detected by the timing detection means to the time before a predetermined period, and the time from the hit timing to the time after the predetermined period is calculated. A measuring device comprising: a calculating means for calculating a velocity of the hit object based on a second Doppler signal. Comparing means for comparing the signal level of the first Doppler signal with a predetermined reference level and detecting that the signal level of the first Doppler signal is equal to or higher than the predetermined reference level;
Storage means for storing the first Doppler signal and the second Doppler signal;
The storage means detects the impact when the impact timing is detected within a predetermined time after the comparison means detects that the signal level of the first Doppler signal is equal to or higher than the predetermined reference level. Storing the first Doppler signal from a timing to a time before a predetermined period and the second Doppler signal from the impact timing to a time after a predetermined period;
The said calculating means calculates the speed of the said hitting object based on the said 1st Doppler signal memorize | stored in the said memory | storage means, and the speed of the said hitting object based on the said 2nd Doppler signal. measuring device. Storage control means for controlling writing of the first Doppler signal and the second Doppler signal to the storage means;
The storage means includes a first area composed of a ring buffer and a second area,
The storage control means stores the first Doppler signal that has become equal to or higher than the predetermined reference level in the first area, and when the timing detection means detects the hit timing, the first Doppler signal The writing of the second Doppler signal to the second region is started, and after the predetermined time has elapsed, the second region of the second Doppler signal is started. The measurement apparatus according to claim 2, wherein control is performed to end writing to the measuring apparatus. First presenting means for presenting that the comparing means has detected that the level is equal to or higher than the predetermined reference level;
Second presenting means for presenting that the timing detecting means has detected the hitting timing;
The apparatus further comprises third presenting means for presenting that the first Doppler signal and the second Doppler signal for determining the velocity of the hit object and the hit object are stored in the storage means. 2. The measuring apparatus according to 2. Imaging means for imaging an operation when a player strikes the hit object using the hit object;
The measurement according to claim 1, further comprising: a moving image of the motion imaged by the imaging unit; a display unit configured to display a speed of the hitting object and a speed of the hitting object which are calculation results of the calculating unit. apparatus. The measuring apparatus according to claim 1, wherein the hit object is a golf club, and the hit object is a golf ball. A measurement method of a measurement apparatus comprising a first Doppler sensor, a second Doppler sensor, a timing detection unit, and a calculation unit,
The first Doppler sensor outputs a first transmission signal, and receives the first Doppler signal that is a signal returned from the first transmission signal reflected from the striking object,
The second Doppler sensor outputs a second transmission signal and receives a second Doppler signal which is a signal returned from the second transmission signal reflected by the hit object,
The timing detection means detects an impact timing which is a moment when the hit object is hit by the hit object;
The calculation means calculates the velocity of the hit object based on the first Doppler signal from the hit timing detected by the timing detection means to a time before a predetermined period, and after a predetermined period from the hit timing. A measurement method for calculating the velocity of the hit object based on the second Doppler signal up to the time.

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