JP2013176581A - Speed measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and low-cost speed measurement device having small power consumption, and stably and comparatively accurately obtaining measurement results of both a head speed and a ball speed.SOLUTION: A speed measurement device includes: a Doppler sensor 11 outputting a Doppler signal; a comparator 12 comparing the Doppler signal outputted by the Doppler sensor with a reference to binarize the Doppler signal; a first microcomputer 14 calculating a head speed based on the output of the comparator; and a second microcomputer 17 obtaining a ball speed by FFT based on the Doppler signal. Furthermore, the first microcomputer includes a function of distinguishing the presence/absence of a swing of a golf club, starts the accumulation of the Doppler signal when it is distinguished that the swing is performed, and performs FFT processing.

Description

  The present invention relates to a speed measuring device for measuring the head speed and ball speed of a golf club.

A device using a Doppler sensor is known as a velocity measuring device that measures the maximum velocity of a moving object. In a conventional speed measuring device using this Doppler sensor, the object to be measured is intended for a device that moves at a constant speed (such as a vehicle) or decelerates (such as a thrown ball). Therefore, if the speed data measured first after starting the measurement is displayed as the maximum speed, no practical problem has occurred. On the other hand, when the object to be measured that accelerates suddenly from the state of zero speed and reaches the highest speed at the point of hitting the ball, such as a swing motion of a golf club or the like, is detected by the Doppler sensor. The moment when the measurement object enters the range is not necessarily the maximum speed of the swing, and the conventional method of displaying the first measured speed after the start of measurement cannot capture the maximum speed of the swing was there.
In order to solve such a problem, there are conventional inventions disclosed in Patent Documents 1 and 2. In the small radar for measuring the club head speed and tempo disclosed in Patent Document 1, the RF Doppler radar is used to continuously measure the speed, and the maximum speed is measured by an arbitrary measurement speed higher than the previously stored speed. The maximum value of the speed is obtained by replacing the stored value.

  Further, the golf club motion measuring device described in Patent Document 2 obtains the maximum value of the speed by analyzing the signal of the frequency shifted by the Doppler effect captured by the ultrasonic sensor by wavelet transform.

JP 2006-326318 A JP2003-210638

  However, in the invention described in Patent Document 1, it is obtained from the Doppler sensor due to various surrounding environment (situation) factors such as the number of surrounding objects, the distance from the object, the size, material, and shape of the reflecting surface of the object. The Doppler signal waveform is disturbed. For this reason, the maximum speed calculated based on the Doppler signal may not be the actual maximum speed of the swing.

  In the invention described in Patent Document 2, since it is necessary to perform calculation processing in real time, a processor capable of high-speed processing is required. Therefore, there is a problem that the cost of the apparatus increases, and the power consumption increases. In addition, in the method of applying transformation such as wavelet transformation, there is a problem that the time resolution for each wave is lowered for convenience of the transformation. For this reason, there is a problem that it is not suitable for obtaining instantaneous velocity data of a measurement object, and it is difficult to perform detailed calculation processing and determination processing using the instantaneous velocity data. In particular, there is a problem that it is difficult to measure the head speed. Further, when the head speed in a state where the user actually hits the ball is measured, there is a problem that the speed measuring device erroneously measures the ball speed as the head speed.

  In addition, since the Doppler sensor detects all the movements of objects that reflect microwaves, the Doppler sensor is used for the movement before the swing (for example, when the measurer who has finished the swing moves his body to check the measurement result). Reacts, the speed display is updated and the result cannot be confirmed.

  It is an object of the present invention to provide an easy-to-use speed measuring device that is small, inexpensive, has low power consumption, and can stably and relatively accurately obtain both head speed and ball speed measurement results. To do.

  (1) In order to achieve the above-described object, a Doppler sensor that outputs a Doppler signal, and first storage means that can store a plurality of data related to the period of the Doppler signal based on the Doppler signal output by the Doppler sensor; The head of the golf club is obtained based on the Doppler signal output by the Doppler sensor, obtains data related to the period of the Doppler signal, accumulates the data in the first accumulation means, and based on the data group accumulated in the first accumulation means Head speed calculation means for calculating speed, second storage means capable of storing A / D conversion data based on the Doppler signal output by the Doppler sensor, and A / D based on the Doppler signal output by the Doppler sensor Obtain conversion data and store it in the second storage means And a ball speed calculation means for calculating a ball speed by performing a frequency spectrum analysis on the A / D conversion data group stored in the second storage means, wherein the golf club has swung. Swing discriminating means for discriminating whether or not, the head speed calculating means, when the period of the Doppler signal output by the Doppler sensor becomes smaller than a predetermined value, data relating to the period to the first accumulation means And the ball speed calculating means starts the accumulation of A / D conversion data in the second accumulating means when it is determined by the swing determining means that there is a head swing. .

  According to the present invention, the head speed is calculated based on a data group in which data related to the period of the Doppler signal is output based on the Doppler signal output by the Doppler sensor, while the ball speed is calculated based on the Doppler signal output by the Doppler sensor. Based on the accumulated A / D conversion data group based on the A / D conversion data.

  By separating the head speed and the ball speed in this way, both the head speed and the ball speed can be accurately measured. In particular, at the measurement position at the time of measurement, the head has a characteristic that the speed change becomes steep due to acceleration motion, while the ball can be regarded as a substantially constant speed. Further, the level of the Doppler signal output by the movement of the head increases, while the level of the Doppler signal output by the movement of the ball decreases. Therefore, as in the present invention, the head speed is calculated based on the period of the Doppler signal, and the ball speed is calculated by performing A / D conversion on the signal based on the Doppler signal and performing frequency spectrum analysis. It is possible to obtain accurate values for both the head speed and the ball speed.

  Further, according to the present invention, based on the Doppler signal output from the Doppler sensor, data relating to the period of the Doppler signal is obtained and stored in the first storage means, and based on the data group stored in the first storage means. Calculate head speed. For example, the Doppler signal from when the measurement object enters the measurable range of the Doppler sensor until reaching the speed to be measured (for example, the maximum speed near the impact on the ball if the measurement object is a sports equipment) is 2 A Doppler pulse signal is obtained by digitization (digitization), and periodic data of the Doppler signal is obtained from the Doppler pulse signal. For example, a memory capable of holding all the period data is prepared as the first accumulation unit, and the head speed calculation unit accumulates the period data in the memory during measurement. Then, for example, the speed calculation means calculates the swing speed (head speed) of the club head based on these periodic data groups stored in the memory.

  As in the present invention, the data on the period of the Doppler signal is accumulated, and the head speed is calculated based on the accumulated data group, so that the head speed is measured as compared with the case where the calculation is performed in real time (eg, Patent Document 2). The device can be simplified, and a small (such as portable) device can be easily realized at low cost. Also, based on accumulated periodic data, compared to a conventional method (such as Patent Document 1) in which the maximum value of the speed is obtained by replacing the stored value of the maximum speed with an arbitrary measurement speed that is faster than the previously stored speed. Since the swing speed is calculated, there is little influence of the ball etc. in the case of a swing hitting the ball etc. at the same time, and a relatively accurate measurement result can be stably obtained in any use environment. .

  According to the invention, the head speed calculation means starts accumulation of data relating to the period in the first accumulation means when the period of the Doppler signal output by the Doppler sensor becomes smaller than a predetermined value. . By doing so, it is possible to stably obtain a relatively accurate measurement result in any use environment, and to reduce the number of accumulated data. Whether the period of the Doppler signal has become smaller than a predetermined value may be determined using an electronic circuit, or may be determined based on the data related to the period described above. And this predetermined value is good to be a value when it is considered that a head swing starts. For example, this value may be set based on the difference between the values obtained when the head is actually swung and the value when the head is not swung.

  According to the present invention, the ball speed is obtained by acquiring A / D conversion data based on the Doppler signal output from the Doppler sensor, accumulating in the second accumulating means, and accumulating the A / D accumulated in the second accumulating means. Calculation is performed by performing frequency spectrum analysis on the converted data. Accumulation of A / D conversion data in the second accumulating unit starts when the swing discriminating unit determines that there is a head swing.

  As described above, the accumulation is started when it is determined that there is a swing of the head, so that the necessary capacity of the second accumulation means can be reduced as compared with the case where the accumulation is always performed. Therefore, as shown in (7), when the speed measuring device is incorporated in a portable housing and driven by a battery, a particularly excellent effect is exhibited.

  Note that the calculated head speed and ball speed may be output so that the user can recognize them. For example, the head speed measuring device may include an output unit, and the head speed obtained by the head speed calculating unit and the ball speed obtained by the ball speed calculating unit may be output from the output unit. The output means may be various display devices such as LED and LCD, or may be output by voice synthesis as a speaker.

  Various types of Doppler sensors that have been known in the art can be used. For example, a signal generation unit that generates an output signal of a predetermined frequency, a transmission antenna that outputs the output signal generated by the signal generation unit, a reception antenna that receives a reflected wave of the output signal, and the reception antenna A mixer that frequency-mixes the received reflected wave and the output signal, and a Doppler sensor that outputs the mixed signal output from the mixer as the Doppler signal can be used. The transmission antenna and the reception antenna can be different, or the same antenna can be used. Thus, for example, a Doppler sensor that outputs a difference signal between a transmission wave and a reflected wave as a Doppler signal can be used. The Doppler signal may be the difference signal itself or a signal obtained by adding a predetermined process to the difference signal. As the Doppler sensor, it is particularly preferable to use a microwave Doppler sensor. According to the microwave Doppler sensor, it is not necessary to open the sensor part of the apparatus itself or use a transparent plate, and the design of the apparatus is not impaired.

  Further, the data related to the period may be the period itself, or may be a value obtained by performing predetermined arithmetic processing on the frequency or other period. For example, a pulse count method may be employed in which the period is converted into a pulse and the width (time) of the pulse is counted.

  In particular, the data relating to the cycle may be data relating to the time of the cycle, and particularly preferably data relating to the time of a small number of cycles (for example, several cycles). It is best to use data related to a period of time. That is, the period is one period, and the data related to the period is preferably data related to one period of time.

  In this way, instantaneous speed data of the head of the golf club that is the measurement object can be obtained. As a result, detailed calculation processing can be performed for each wave. Certainly, FFT or wavelet transform is more advantageous in terms of S / N. However, since the Doppler sensor monitoring area is not a point but a space, when measuring the swing speed of the head, not only the head but also the limbs of the person swinging the head and the objects attached to the head (for example, the shaft portion) ) Is included, so it is more accurate to eliminate sudden and inappropriate waves included in the Doppler signal as well as S / N. is there.

  The frequency spectrum analysis in the ball speed calculation means can be performed by, for example, wavelet transform. However, the following (2) is recommended.

  (2) That is, the frequency spectrum analysis is particularly preferably performed by fast Fourier transform (FFT). In this way, the golf ball is small and far from the head. Even in the case of an input signal having a disadvantageous S / N ratio due to a small reflected wave due to a small reflected wave, the FFT disperses the noise component over the entire frequency by frequency decomposition, and the signal component is extracted as a line spectrum. A sufficient signal-to-noise ratio for analysis can be ensured.

  (3) The swing determining means may determine that the head has swung when the period of the Doppler signal based on the Doppler signal output by the Doppler sensor is a periodic pattern corresponding to the head swing. . The periodic pattern corresponding to the head swing may be determined in advance based on a periodic pattern obtained by swinging various clubs with a large number of people and a periodic pattern obtained when the club is not swinging. Alternatively, for example, a periodic pattern corresponding to the user's swing may be learned and used.

  (4) The ball speed calculation means accumulates A / D conversion data for a predetermined period after the accumulation of A / D conversion data in the second accumulation means, and then performs the A / D conversion. It is preferable that the accumulation of the conversion data is terminated, and the ball speed is calculated by performing frequency spectrum analysis on the A / D conversion data accumulated in the second accumulation means after the accumulation is completed. The predetermined period may be a time required for measurement after the head hits the ball.

  In this way, the size of the storage area for the A / D conversion data required for the second storage means can be set to a constant value, and the size of the storage area for the data required compared to the configuration in which constant storage is performed. Can be reduced. Further, since the frequency spectrum analysis for the accumulated A / D conversion data is performed after the accumulation is completed, the ball is used with an inexpensive processing device having a lower processing capacity than the configuration in which the accumulation of the A / D conversion data and the frequency spectrum analysis are performed simultaneously. Speed can be measured accurately. The predetermined period may be about 100 ms to 200 ms, for example. The second accumulating means can be constituted by a memory of about several kilobytes, for example.

  Therefore, as shown in (7), when the speed measuring device is incorporated in a portable housing and driven by a battery, a particularly excellent effect is exhibited.

  (5) After the ball speed is calculated, the ball speed calculating means may be in a predetermined low power consumption state until the swing determining means determines that the head has swung next. In this way, the power consumption of the speed measuring device can be suppressed. Therefore, as shown in (7), when the speed measuring device is incorporated in a portable housing and driven by a battery, a particularly excellent effect is exhibited.

  For example, while the Doppler sensor, the swing discriminating means, the first accumulating means and the head speed calculating means are constantly supplied with electric power, the second accumulating means and the ball speed calculating means complete the calculation of the ball speed, and the calculated ball speed When the output of this data is completed, the supply of power may be stopped, and then the supply of power may be resumed when the swing determination means determines that there has been a head swing. Alternatively, power is always supplied to the Doppler sensor, the swing discriminating means, the first accumulating means, and the head speed calculating means, while the second accumulating means and the ball speed calculating means complete the calculation of the ball speed, and the calculated ball speed When the output of the data is completed, the power saving mode may be entered. Next, when the swing discriminating means determines that the head has swung, the power saving mode may be switched to the normal mode.

  (6) Measuring object setting means for setting whether the measuring object is a putter or a club other than a putter, and an amplifying means for amplifying the Doppler signal output by the Doppler sensor, When a putter is set as the measurement target by the measurement target setting means, the pass band of the Doppler signal is set to a frequency band lower than the pass band of the Doppler signal when other than the putter is selected as the measurement target. Good. Since the ball speed is slow when the putter is used, the passband of the Doppler signal may be set to a passband having a frequency of about one fifth that of the case other than the putter, for example. In this way, even when the club is a putter or other than a putter, circuit noise or the like in a band that is not necessary for each is cut off, so that both the head speed and the ball speed can be accurately measured.

  (7) The speed measuring device according to any one of the above (1) to (6) has a particularly excellent effect when configured as a speed measuring device built in a portable housing and driven by a battery. Demonstrate. That is, according to the inventions (1) to (6), the circuit scale can be kept small. For example, it is possible to easily adopt a processing apparatus that constitutes each means having a relatively low processing speed, a small size, a low price, and low power consumption. Therefore, the speed measuring device can be easily made into a small and portable housing, and can be easily driven for a long time by a battery. For example, it is not necessary to always perform calculation of frequency spectrum analysis, and power consumption can be suppressed. Further, since it is not necessary to perform the calculation of the frequency spectrum analysis in real time, it is not necessary to make the processing unit such as a CPU high performance. Therefore, power consumption and cost can be suppressed. Furthermore, for example, by predetermining the start timing and end timing of data storage, it is only necessary to prepare a predetermined amount of data storage memory, and it is necessary to prepare a large amount of memory. Disappear. Therefore, a portable and small battery-driven speed measuring device can be easily obtained.

  (A) When the period of the Doppler signal equal to or greater than a specified value is detected, the head speed calculation unit may obtain data relating to the period of the Doppler signal corresponding to the period of the Doppler signal equal to or greater than a specified value. It is better not to store in the storage means.

  In particular, when the period of the Doppler signal output by the Doppler sensor becomes smaller than a predetermined value, accumulation of data related to the period in the accumulating means is started, and after the accumulation starts, the Doppler signal exceeding the specified value is started. When the period is detected, data relating to the period of the Doppler signal corresponding to the period of the Doppler signal equal to or greater than a predetermined value may not be accumulated in the accumulation unit.

  (B) The head speed calculation means may calculate the head speed speed when the number of data stored in the first storage means reaches a predetermined reference number. By calculating the head speed based on a plurality of accumulated data, the influence of noise and surrounding conditions can be suppressed and measurement can be performed with high accuracy.

  (C) The head speed calculation means waits for the period of the Doppler signal obtained by the Doppler sensor to become a predetermined value or less, and when it becomes the predetermined value or less, the head speed calculation means sends the data relating to the period to the first accumulation means. And when the period of the Doppler signal becomes equal to or greater than a predetermined value after the start of the accumulation, and the accumulated number of data in the first accumulation means does not reach the reference number It is preferable to return to a state of waiting for the period of the Doppler signal obtained by the Doppler sensor to become a predetermined value or less.

  For example, in a configuration for obtaining a Doppler pulse signal obtained by binarizing (digitizing) a Doppler signal, wait for the input of a Doppler pulse when measurement is started, and for storing Doppler pulse period data when a Doppler pulse exceeding a certain frequency is input When data accumulation to the memory is started and data accumulation is started but no Doppler pulse is input for a certain period of time, if the number of data already accumulated does not exceed the specified number, the measurement condition is not satisfied, and the Doppler pulse is repeated. It is better to return to the state waiting for input. For example, the control unit may be provided with a timer, and the fixed time may be detected when an overflow occurs in the timer.

  In this way, it is possible to eliminate the influence of the movement of an object having a low speed and the influence of an instantaneous movement that is fast but has no continuity as much as a club swing. Since the backswing is slower than the normal swing, for example, the reference frequency for starting data accumulation in the accumulating means is set as high as possible within a range that does not interfere with speed measurement (the reference period is within a range that does not interfere with speed measurement). By making it as low as possible), backswing measurements can be avoided with a very high probability. Therefore, the influence of the ball or the like is small, and a relatively accurate measurement result can be stably obtained in any use environment, and a convenient speed measurement device can be provided.

  Further, according to the invention of (C), the required capacity of the first storage means can be reduced and abnormal data can be eliminated. And a comparatively accurate measurement result can be obtained stably, and an easy-to-use speed measuring device can be provided. For example, the specified value may be larger than the predetermined value. That is, it is preferable to make the period that becomes the accumulation condition longer than the period that becomes the start condition. In this way, a more accurate measurement result can be obtained.

  (D) The number of data relating to the period obtained by the head speed calculation means is the wave number of the Doppler signal generated during the distance from when the measurement object enters the detection range of the Doppler sensor to the measurement object position. It is good to do.

  For example, when the measurement object is a golf club head, the measurement object position is assumed to impact the ball when the ball exists. In this case, the number of data related to the period obtained by the head speed calculation means is the distance to the position where the golf club head is supposed to impact the ball when the ball exists after the head enters the detection range of the Doppler sensor. The wave number of the Doppler signal generated during

  According to the invention of (D), accumulation of unnecessary measurement data after impact can be prevented and erroneous measurement due to the movement of the ball can be avoided. For example, when the object to be measured is a golf club head, the optimum number of accumulated waves is the number of waves generated from the point when the golf club enters the detection range until the position where the ball is expected to impact the ball when it exists. Although it is a number, it varies depending on factors such as the shaft length, the height of the measurer, the length of the arm, the position of the apparatus, etc., so it should be determined taking these into account. For example, a wave number corresponding to 60 cm to 80 cm may be used. The number of stored periodic data is preferably about 100 when using a microwave of 24 GHz band, for example.

  (E) The head speed calculation means includes accumulation candidate data storage means for storing data relating to a period of the Doppler signal based on the Doppler signal output by the Doppler sensor as accumulation candidate data, and Doppler output by the Doppler sensor. Determination means for determining whether or not accumulation candidate data stored in the accumulation candidate data storage means based on the Doppler signal based on a signal is to be accumulated in the first accumulation means, and the determination means The accumulation candidate data stored in the accumulation candidate data storage means determined as the accumulation target data by the above may be accumulated in the first accumulation means.

  In the case of such a configuration, for example, determination of “when the period of the Doppler signal output by the Doppler sensor is smaller than a predetermined value”, determination of “when the period of the Doppler signal equal to or greater than a specified value is detected”, The determination “when the value is less than or equal to the predetermined value” may be performed by a determination unit.

  (F) The head speed calculation means may perform a predetermined arithmetic process on the data group stored in the first storage means to calculate the swing speed. For example, data that meets a predetermined condition (for example, the minimum value) may be searched after performing a process of taking a moving average as an arithmetic process on the accumulated periodic data. In this way, from the accumulated data, instead of simply calculating the swing speed using the data of the minimum period, each data is compared with the previous and subsequent data to eliminate inappropriate data, The measurement value can be stabilized by averaging only with a highly reliable data group from which inappropriate data is excluded.

  (G) On the premise of the invention of (F), the head speed calculation means excludes data having a variation larger than a predetermined allowable value from the data group data stored in the first storage means. It is preferable that an exclusion process to be performed and a predetermined arithmetic process to be performed on the arithmetic processing target data that is data not excluded by the exclusion process. In this way, the accuracy of the measurement result can be further improved.

  (H) On the premise of the invention of (G), a plurality of different allowable values are provided as the predetermined allowable value, and the exclusion process is performed with a relatively small allowable value. As a result, the number of the arithmetic target data Is less than the predetermined number, it is better to re-execute the exclusion process with a larger tolerance than the relatively smaller tolerance.

  In other words, it is preferable to perform the process in several stages by changing the tolerance of variation. In this way, when data related to a period with less variation is accumulated, a more accurate swing speed can be calculated, while when data with large variation is accumulated, Since the swing speed with a certain degree of accuracy can be calculated, it is possible to prevent a situation in which the swing speed is not calculated at all even in a situation where data relating to the period cannot be acquired very well. In this way, it is possible to realize a swing speed calculation device that can realize accuracy according to the acquisition status of data related to the cycle and is easy to use.

  (I) It is provided with a moving direction detecting means for detecting the moving direction of the measurement object, and the first accumulating means stores data relating to the period when the moving direction detected by the moving direction detecting means is not a swing direction. Do not accumulate.

  As described above, various types of Doppler sensors can be used in the present invention. For example, a one-output type Doppler sensor cannot determine whether an object is approaching or moving away. Therefore, for example, data may be accumulated even when the swing is not a regular swing, such as during backswing, and an incorrect speed may be obtained as the swing speed. Therefore, according to the invention of (I), only the data in the normal movement direction is stored in the first storage means, thereby reducing the influence when the normal swing is not performed as in the backswing. Can do. As the moving direction detection means, for example, a two-output type Doppler sensor is used. Based on the phase difference between the two outputs of the two-output type Doppler sensor, it is detected whether or not the moving direction is the swing direction. It is good to have a configuration to do.

(J) comprising display means for displaying the head speed calculated by the head speed calculation means and the ball speed calculated by the ball speed calculation means, the display means after the head speed or the ball speed is calculated The display of the speed may be blinked for a predetermined time.
In this way, the user can know whether or not the speed measurement has succeeded based on whether or not the blinking display has been made. Further, there is no need for a separate display area for displaying that the speed measurement is successful, and a large number of input / output circuits and wirings are not required for driving the display. Therefore, it is possible to provide an easy-to-use speed measuring device that can be miniaturized (portable or the like) at low cost.

  (K) Further, the meet rate may be calculated and displayed based on the head speed calculated by the head speed calculating means and the ball speed calculated by the ball speed calculating means. The meat rate is calculated by ball speed / head speed.

  (L) Further, a club selection function may be provided, and the estimated flight distance may be calculated and displayed by at least one of the head speed calculated by the head speed calculating means and the ball speed calculated by the ball speed calculating means. Also, for example, when the speed corresponding to the ball speed is not detected by the ball speed calculation means, such as in the case of swinging the club, it is determined that the swing is without a ball and is estimated based on the calculated head speed. The flight distance may be calculated and displayed. In this way, the estimated flight distance can be known whether or not there is a ball. The estimated flight distance is calculated by, for example, obtaining a coefficient for each club type with respect to the head speed and a coefficient for each club type with respect to the ball speed based on the actually measured values and storing them in advance. It is good to obtain by multiplying these coefficients by the measured speed. Which of the estimated flying distance obtained based on the head speed and the estimated flying distance obtained based on the ball speed is set as the estimated flying distance to be output is determined based on a predetermined rule determined in advance. Alternatively, the estimated flight distance may be calculated by performing a predetermined calculation (for example, an average value) between the estimated flight distances of the two.

  According to the present invention, it is possible to provide an easy-to-use speed measuring device that is small, inexpensive, consumes less power, and can stably obtain both relatively accurate head speed and ball speed measurement results.

It is a figure which shows an example of a utilization aspect. It is a figure which shows an example of a utilization aspect. It is a top view which shows the external appearance of suitable one Embodiment of the speed measuring apparatus which concerns on this invention. It is a block diagram which shows suitable one Embodiment of the speed measuring apparatus concerning this invention. It is a figure which shows the internal structure of a microcontroller. It is a flowchart which shows the overflow generation | occurrence | production various functions of a microcontroller. It is a flowchart which shows the Doppler pulse fall detection processing function of a microcontroller. It is a flowchart which shows the Doppler pulse fall detection processing function of a microcontroller. It is a flowchart which shows the speed calculation processing function of a microcontroller.

  1 and 2 are diagrams showing an example of a usage state of a golf club head speed measuring apparatus which is a speed measuring apparatus of the present invention. As shown in the figure, the golf club head speed measuring device 10 is installed at a predetermined position behind the golfer 1 swinging the golf club 2. The specific installation position is a position where the detection range of the golf club head speed measuring device 10 includes a point where the head 2a of the golf club 2 during the swing moves at the maximum speed. As an example, as shown in FIG. 1, the vicinity of the lowest point of the movement locus K of the head 2a of the golf club 2 is the impact position with respect to the ball B, and the movement speed of the head 2a is usually the maximum speed near the position. Therefore, it is on the tangent L of the lowest point of the movement trajectory K and the rear of the golfer 1 is set as the installation position. In the present embodiment, the distance between the ball B and the golf club head speed measuring device 10 does not need to be determined strictly, but the golf club 2 does not hit the golf club head speed measuring device 10 during backswing. . For example, the distance between the ball B and the golf support apparatus 10 is about 1 m. As will be described later, since the Doppler sensor is built in the golf support device 10, the opening surface 11 a of the antenna of the Doppler sensor is installed so as to face the ball B (facing the tangent L). In the present embodiment, the golf club head speed measuring device 10 is described as being installed at a predetermined position behind the golfer 1 swinging the golf club 2. The club to be used may be anything such as wood iron putter.

  In the drawing, the ball B is placed and drawn so that the golfer 1 actually hits the ball B. However, in the present embodiment, the ball B may be omitted. That is, when the head speed measuring device 10 actually hits the ball B, the head speed measuring device 10 measures both the head speed and the ball speed at the same time for each swing, and does not place the ball B. Measure only the head speed.

  FIG. 2 shows an example in which the golfer 1 is right-handed. In the case of a left-handed golfer, this can be dealt with by installing the golfer in a state where the left and right are reversed. That is, the golf support apparatus according to the present embodiment can handle both right-handed and left-handed.

  FIG. 3 is a plan view showing the appearance of the golf support apparatus 10, and FIG. 4 is a block diagram showing its internal configuration. As shown in FIG. 3, the golf support apparatus 10 is configured by housing each component shown in FIG. 4 inside a flat rectangular housing 20 that is waterproofed (waterproof structure). Some of the components are exposed to the outside of the housing 20.

  As shown in FIG. 4, the golf club head speed measuring apparatus 10 includes a microwave Doppler sensor 11 having an output frequency of 24.15 GHz and an output signal of the Doppler sensor (one wave is moved by 6 mm of the golf club head). An amplifier 12 that amplifies the corresponding signal), and the signal amplified by the amplifier 12 is compared with a reference value, and a Doppler pulse (a high level signal that is higher than the reference value and a low level signal that is lower than the reference value) The comparator 13 for output, the first microcontroller 14 for obtaining the swing speed (head speed) by inputting the signal output from the comparator 13, and the signal output from the amplifier 12 (Doppler output from the Doppler sensor 11) 2nd micro to obtain the ball speed by inputting the amplified signal) It includes a controller 17, a display unit 15 for displaying such as swing speed by the control of the first micro-controller 14, a switch group 16 connected to the first microcontroller 14. The display unit 15 also displays the ball speed obtained by the second microcontroller 17. The display 15 is formed from an LCD, an organic EL display, or the like. The switch group 16 includes a power switch and a mode switch.

  As shown in FIG. 3, the front surface 20b of the housing 20 serves as an opening surface 11a of the antenna, and the rear surface 20c of the housing 20 is provided with a micro SD card slot. In addition, a battery storage unit is provided on the back surface (lower surface) side of the housing 20. The display 15 and the switch group 16 are exposed on the upper surface of the housing 20. In the present embodiment, the switch group 16 includes four operation buttons including a power button B1, a mode select button B2, a club select button B3, and a function button B4. When each of the operation buttons B1 to B4 is pressed, the press is notified to the first microcontroller 14, and the first microcontroller 14 performs a predetermined process.

  The power button B1 is for controlling the power on / off of the head speed measuring device 10, and is a button for switching the power on / off of the device by long pressing. When the first microcontroller 14 recognizes that the power button B1 has been pressed for a long time when the device is turned off, the first microcontroller 14 turns on the power and the power button B1 is turned on while the device is turned on. When it is recognized that the button has been pressed, the power is turned off.

  The mode select button B2 is a button for instructing mode switching. The head speed measuring device 10 according to the present embodiment goes around the virtual golf course as if it were a game, assuming a “measurement mode” for displaying and measuring various characteristics associated with the swing for each swing, and a virtual golf course. It has a “training mode”. Therefore, when the microcontroller 14 recognizes that the mode select button B2 has been “long pressed”, the microcontroller 14 alternately switches between the “measurement mode” and the “training mode”. The microcontroller 14 displays the “GAME” logo in the upper left corner of the display 15 when the current mode is “training mode”, and does not display the “GAME” logo when in the “measurement mode”. . Therefore, the user can recognize whether the current training mode or the measurement mode is in effect based on whether or not the “GAME” logo is displayed. In addition, the actual play can be recorded by measuring and recording each shot (swing) during the play while playing at the actual golf course in the measurement mode.

  Further, various characteristics that can be obtained in the measurement mode are “head speed”, “ball speed”, “estimated flight distance”, and “meet rate”. The head speed and the ball speed are obtained based on the output of the Doppler sensor. In the training mode, the stored map data of the virtual golf course (course) (distance from the tee ground to the cup, the position of the penalty zone such as OB / water hazard, etc.) is read out and the golf club swings. The estimated flight distance is calculated from the head speed or ball speed, the remaining distance to the cup is obtained, and the obtained remaining distance and the number of hits so far are displayed on the display 15, and finally the cup-in (remaining distance is the threshold). It is repeated until the value becomes less than or equal to).

  In the present invention, it is not necessary to provide both the training mode and the measurement mode. For example, only the measurement mode may be used. On the contrary, even when the apparatus is only in the training mode, the above characteristics may be obtained every time the swing is performed when playing the virtual golf course.

  Next, a function for obtaining various characteristics will be described. First, when the power is turned on by long pressing of the power button B1, the power is turned on to the internal circuit, and the Doppler pulse is input from the comparator 13 to the first microcontroller 14.

  The first microcontroller 14 performs a process for measuring the head speed of the golf club. The head speed measurement process includes two processes of “Doppler pulse period measurement and accumulation” and “speed calculation”. In order to specialize in the speed measurement of the head speed during the swing of the golf club, the present apparatus temporarily accumulates the speed data from the start to the end of the swing, and then calculates the maximum speed of the swing from the accumulated data. The specific contents of these processes will be described next.

  As shown in FIG. 5, the first microcontroller 14 includes a 16-bit counter (timer) 21 and a memory (RAM) 22 as first storage means. The counter 21 receives a 2.5 MHz signal as a reference pulse and performs counting. The value of the counter 21 can be taken into the capture register 21a when a predetermined event occurs. A periodic data storage area for storing periodic data is provided in the memory 22, and this area consists of 110 array areas (total of 220 bytes) with a 16-bit width.

  The first microcontroller 14 receives the Doppler pulse output from the comparator 13. The first microcontroller 14 measures the period of this Doppler pulse. The counter 21 is used for measuring this period. More specifically, when a fall of the Doppler pulse occurs as the predetermined event, a fall detection interrupt of the Doppler pulse is generated, and the counter value at that time is set to be captured in the capture register 21a. The capture register 21a stores accumulation candidate data. When a Doppler pulse falling detection interrupt occurs, the contents of the capture register 21a are recorded in the memory 22 as periodic data in an interrupt processing routine.

  When the counter 21 overflows in the counter 21, a counter overflow interrupt is generated. When a counter overflow interrupt occurs, counter overflow interrupt processing is performed.

  In each process executed by the first microcontroller 14, “waiting to start”, “measuring”, “completed”, and “error” are defined as measurement states (process states). The data is stored in the set state storage area, and the processing content is changed based on the stored state. The state “wait for start” is a state waiting for the fall of the first Doppler pulse. This state is set immediately after resetting (immediately after power-on), and the falling edge of the Doppler pulse is detected. The state “measuring” is a state in which periodic data is accumulated. The state “completed” is a state in which the accumulation of the periodic data is completed and the number of valid measurement data exceeds the specified value. When this state is reached, a speed calculation process is performed to check the accumulated data and calculate the speed. The state “error” is a state in which the accumulation of the periodic data is completed, but the number of accumulated data is less than the standard. When this state is reached, the accumulated data is immediately discarded, and a process (not shown) for returning to the “waiting for start” state is performed.

  First, the counter overflow interrupt processing function executed by the first microcontroller 14 will be described with reference to the flowchart of FIG. Since the counter 21 has 16 bits, when the counter value reaches 65535 + 1, a counter overflow interrupt is generated and this processing is started.

  First, in S110 (S110 is an abbreviation for step 110, and the same applies hereinafter), the number of overflow occurrences held in the memory is incremented by one. In subsequent S120, it is determined whether the measurement state is “waiting to start”, “complete”, or “measuring”. If the measurement state is “wait for start” or “complete” (S120: wait for start or completion), this process is terminated. On the other hand, when the measurement state is “measuring” (S120: during measurement), the process proceeds to S130. In S130, it is determined whether or not the number of overflow occurrences has reached a specified number. This specified number of times is set to 16. The fact that the overflow occurs 16 times means that the falling edge of the pulse is not input for a long time of about 400 ms. In such a case, it is necessary to exit the “under measurement” state. . If the number of overflow occurrences has not reached the prescribed number (S130: No), the counter overflow interrupt process is terminated. On the other hand, when the number of overflow occurrences reaches the specified number (S130: Yes), the process proceeds to S140. In S140, it is determined whether or not the number of recorded data (the number of recorded periodic data shown in FIG. 3) exceeds a specified number. This specified number is set to “32”. If the number of recorded data exceeds the specified number (S140: Yes), the process proceeds to S150, the measurement state is changed to “completed” in S150, and this interrupt process is terminated. On the other hand, if the number of recorded data does not exceed the prescribed number (S140: No), the process proceeds to S160, the measurement state is changed to “error” in S160, and this interrupt process is terminated.

  By such processing, when an overflow occurs, the number of overflow occurrences is counted, and when an abnormal state such as an overflow occurrence number of 16 occurs, the measurement is stopped there and the recorded data exceeds the specified number 5 changes the measurement state to “completed” and performs the speed calculation process shown in FIG. 5 described later. On the other hand, if the recorded data does not exceed the specified number, the measurement state is changed to “error” and stored. The unprocessed data is discarded and the process returns to the “waiting for start” state.

  Next, the contents of the Doppler pulse falling interrupt processing (Doppler pulse period measurement and accumulation processing) when a Doppler pulse falling interrupt occurs will be described with reference to FIGS.

  When detecting the falling edge of the Doppler pulse, the first microcontroller 14 starts the Doppler pulse falling interrupt process shown in FIGS. First, in S310, it is determined whether the measurement state is “waiting to start”, “completed”, or “under measurement”. If “waiting for start” (S310: wait for start), the process proceeds to S320, if “completed” (S310: completed), the process proceeds to S440, and if “measuring”, the process proceeds to S360.

  In S320, it is determined whether or not the cycle is smaller than a specified value. As the specified value, for example, the head speed of the golf head is set to 776 times which is a count value corresponding to about 0.31 ms which is a cycle corresponding to 20 m / s. Specifically, it is determined whether or not the value of the capture register 21a is smaller than this specified value. When the cycle is smaller than the specified value (when the count value is smaller than 776 times) (S320: Yes), the process proceeds to S330, and when the cycle is the specified value or more (when the count value is 776 times or more) ( (S320: No), the process proceeds to S440. In S330, it is determined whether or not the number of overflow occurrences is zero. When it is 0 (S330: Yes), the process proceeds to S332, and when it is not 0 (non-zero) (S330: No), the process proceeds to S440.

  In S332, C is incremented by “+1”, and in S334, it is determined whether or not the incremented new C value is 4. When the value of C is not 4, that is, from 1 to 3 (S334: No), the process proceeds to S440. When the value of C is 4, after resetting to C = 0 (S336), the process proceeds to S338. In S338, the first microcontroller 14 outputs an accumulation start signal to the second microcontroller 17. In other words, when the cycle is smaller than the measured value (S320 is Yes) and no overflow has occurred (S330 is Yes), it can be determined that a swing has occurred, and the accumulation start signal is Is output. The function of executing the processing steps of S320 to S338 constitutes a swing determination unit.

  This swing discrimination means discriminates that there is a head swing when the period of the Doppler signal based on the Doppler signal output by the Doppler sensor is a periodic pattern corresponding to the head swing (finally Yes in S334). doing. A periodic pattern corresponding to the head swing is determined in advance based on a periodic pattern obtained by swinging various clubs with a large number of people in advance and a periodic pattern obtained when the club is not swinging. For example, a periodic pattern corresponding to a user's swing may be learned and used.

  After outputting the accumulation start signal, the first microcontroller 14 proceeds to S340. In S340, the measurement state is changed to “under measurement”, and the process proceeds to S350. In S350, the number of falling occurrences stored in the memory 22 is changed to zero. In this manner, when the period of the Doppler signal output by the Doppler sensor 11 becomes smaller than a predetermined value, the setting for starting accumulation of the period data in the memory 22 is performed. Therefore, in the interrupt process at the next falling edge of the Doppler pulse, it is determined as “measuring” in S310, and the processes after S360 are performed.

  In S360, the number of occurrences of falling stored in the memory is incremented by one. In subsequent S370, it is determined whether or not the number of overflow occurrences is zero. If the number of overflow occurrences is 0 (S370: Yes), the process proceeds to S400, and if the number of overflow occurrences is not 0 (S370: No), the process proceeds to S380.

  Since the counter 21 is 16 bits, an overflow interrupt occurs when the count value exceeds 65535, and the overflow occurrence count is incremented in the overflow interrupt processing (S110 in FIG. 4). The count value 65535 corresponds to about 26 ms, and is sufficiently longer than the value (period) to be measured. Therefore, if overflow occurs, it is determined that the period data need not be recorded.

  In S380, it is determined whether or not the cycle is smaller than a specified value. Specifically, it is determined whether or not the value of the capture register 21a is smaller than this specified value. This specified value is set to 776 times the same as the specified value in S320. When the cycle is smaller than the specified value (when the count value is smaller than 776 times) (S380: Yes), the process proceeds to S390, and when the cycle is greater than the specified value (when the count value is 776 times or more) ( (S380: No), the process proceeds to S400. In S390, the data is recorded in the memory 22. That is, the value of the capture register 21a is stored in an array on the memory (RAM) 22 (if there is data previously recorded, it is recorded in an area next to the area in the previously stored array) (see FIG. 5), S400. Migrate to

  In S400, it is determined whether or not the number of falling occurrences during measurement has reached a specified number. If the specified number has been reached (S400: Yes), the process proceeds to S410, and if the specified number has not been reached. (S400: No), the process proceeds to S440. The specified number of times (corresponding to “wave number”) is set to 110 times. The 110 times corresponds to 6 mm × 110 times = 66 cm as a “distance from when the measurement object enters the detection range of the Doppler sensor to the measurement object position”.

  In S410, it is determined whether or not the number of recorded data in the array on the memory 22 exceeds the prescribed number (S410: Yes), the process proceeds to S420, and in S420. Then, the measurement state is changed to “completed”, and the interruption process is terminated. On the other hand, if the specified number has not been exceeded (S410: No), the process proceeds to S430, and in S430, the measurement state is changed to “error” and the interrupt process is terminated. The specified number of recorded data in S410 is set to “32”. That is, when it is determined that an overflow has occurred in the process of S370 (S370: Yes) or when the period is determined to be equal to or greater than the specified value in S380 (S380: No), the process of S390 is not performed and the period data Therefore, the number of recorded data may be less than 110. In this case, the number required for the speed calculation process of FIG. 9 described later is set to 32, and when this number is exceeded (S410: Yes), the measurement state is set to “completed” and the speed calculation process is performed. If the number is not exceeded (S410: No), the measurement state is changed to “error”, the accumulated data is discarded, and the process returns to the “waiting for start” state. I will let you.

  When the measurement state is “completed” by the Doppler pulse falling detection interrupt processing as described above, 33 or more pieces of data related to the period for which the speed is to be calculated are accumulated in the memory (array) 22. .

  Next, the speed calculation process will be described with reference to FIG. The speed calculation process starts when the measurement state becomes “complete”.

  In S <b> 510, the moving average of the data from the beginning to the accumulated number of the periodic data accumulated in the memory 22 is calculated, and the calculation result is stored in the memory (RAM) 22. Specifically, an arithmetic average is obtained from four data of the period data 1 to the period data 4 and stored in a moving average storage array in the memory (RAM) 22. Subsequently, an arithmetic average is obtained from the four data of the period data 2 to the period data 5 and is stored in the moving average storage array in the memory 22 as the moving average period data. Similarly, the arithmetic average of the periodic data is obtained and sequentially stored in the moving average storage array in the RAM.

  Next, data with large variation is excluded. That is, if all of the four original data used for the calculation of the moving average in S510 are not within the range of the average value ± n%, the data is data with a large variation (that is, data with low reliability of the measurement value). ) And the moving average value calculated from the original data is excluded from the subsequent processing.

  Specifically, in step S520, the value of n is first set to 12.5%, and when all of the four original data are not within the range of the average value ± 12.5%, the data is regarded as data having a large variation. Therefore, an exclusion flag is set for the moving average value calculated from the original data. For example, the exclusion flag allocates a 1-bit memory area for one moving average period data in a format corresponding to the moving average storage array.

  In the subsequent S530, if the number of data (the number of valid data) for which the exclusion flag is not set is less than 10 as a result of the exclusion process in S520 (S530: Yes), the exclusion flag is canceled, and the process proceeds to S540. .

  In S540, if the value of n is now 25% and all of the four original data are not within the range of the average value ± 25%, the data is regarded as data having a large variation and is calculated from the original data. An exclusion flag is set for the moved average value.

  In the subsequent S550, it is determined whether or not the number of data (the number of valid data) for which the exclusion flag is not set is less than 10 as a result of the exclusion process in S520. If it is less than 10 (S550: Yes), the process proceeds to S560. Transition. In S560, the measurement state is set to “error”, and this process ends. On the other hand, when the number of data (number of valid data) for which the exclusion flag is not set is 10 or more (S550: No), the process proceeds to S570. In S530, when the number of data (the number of valid data) for which the exclusion flag is not set is 10 or more (S550: No), the process proceeds to S570.

（ｖ：ヘッド速度、ｃ：光速(299792485m/s)、fb：カウンタの基準パルス周波数、f0：マイクロ波ドップラーセンサ出力周波数(24.15GHz)、nmin：最小周期データの値） In S570, the minimum cycle data (minimum cycle value = maximum frequency value = corresponding to the maximum speed) is searched from the moving average cycle data in which the exclusion flag is not set. In the subsequent S580, the speed (head speed) is calculated from the minimum cycle data obtained in S570. The speed is calculated based on (Equation 1) below.

(V: head speed, c: speed of light (299792485m / s), fb: counter reference pulse frequency, f0: microwave Doppler sensor output frequency (24.15GHz), nmin: value of minimum cycle data)

  In subsequent S590, the head speed obtained in S580 is displayed on the display. For example, it is displayed as 50.0 m / s. At this time, the display of the head speed blinks for 10 seconds from the start of the display. When the flashing display process for 10 seconds is completed, the head speed obtained in S580 is displayed as a lighting display, and the process proceeds to S600.

  In the subsequent S600, the measurement state is changed to “wait for start”.

  With such a configuration, the user can know the head speed by looking at the display. That is, as shown in FIG. 1, the golfer 1 as a user sets the golf club head speed measuring device 10 at a predetermined position and operates the switch group 16 to turn on the power. Next, in this state, the golfer 1 swings the golf club 2. At this time, the ball B may be actually hit by teeing up or the like, or the swing may be performed without setting the ball.

  When the head 2a of the golf club 2 enters the detection range of the Doppler sensor 11 along with the swing, a Doppler pulse having a period corresponding to the moving speed of the head 2a is input to the first microcontroller 14, and based on that, each period is changed. Data is stored in the memory 22 and then the maximum speed is measured. When the measurement is correctly performed, the calculated head speed (instantaneous maximum speed) is displayed on the display unit 15 in a blinking state. On the other hand, if the measurement cannot be performed correctly for some reason, the speed is not displayed. Therefore, the user can know whether or not the measurement can be made and whether or not the speed can be measured by looking at the display 15 after the swing, depending on whether or not the speed is displayed in a blinking state.

  Next, the function of the second microcontroller 17 will be described. When the second microcontroller 17 receives the accumulation start signal from the first microcontroller 14 in accordance with the execution of S338, the second microcontroller 17 incorporates the Doppler signal (amplified signal) output from the amplifier 12. Is converted into a digital signal by the A / D converter, and is loaded and stored in a built-in memory (RAM) for 160 ms. When the capture is completed, the speed is calculated by performing an FFT operation on the accumulated data in the memory. As a method for calculating the speed by performing an operation by FFT, a known method used for a speed gun or the like may be used. Then, the calculated speed data is sent to the first microcontroller 14.

  That is, the moving speed of the head 2a accompanying the swing of the golf club 2 gradually increases from the start of the swing, reaches a maximum speed before and after hitting the ball, and then gradually decreases. On the other hand, since the ball B remains stopped at the beginning of the swing of the golf club 2, the moving speed becomes 0, and the head 2a hits and strikes, so that the speed of the ball B increases. There is a difference between the peak of the speed change of the head speed and the peak of the speed change of the ball speed (the peak of the ball speed occurs with a delay). Therefore, the swing determination means (the processing algorithm that executes S320 to S328) detects the golf swing and the first microcontroller 14 outputs the accumulation start signal. A Doppler signal (a signal amplified by the amplifier 12) necessary for calculation is recorded.

  Accordingly, the head speed is calculated based on a data group in which data related to the period of the Doppler signal based on the Doppler signal output by the Doppler sensor is calculated, while the ball speed is calculated based on the Doppler signal output from the Doppler sensor. Calculation is performed based on the A / D conversion data group in which the / D conversion data is accumulated. By separating the head speed and the ball speed in this way, both the head speed and the ball speed can be accurately measured.

  Further, when the speed data is sent from the second microcontroller, the first microcontroller displays the speed as the ball speed on the display 15 and the value obtained by dividing the ball speed by the head speed calculated by itself. Is displayed as a meet rate on the display.

That is, the first microcontroller 14
The meet rate is calculated by meet rate = ball speed / head speed.

  The estimated flying distance is obtained from the ball speed and the used club type when the ball is actually hit, and in the case of swinging, the flying distance is obtained from the head speed and the used club type. Specifically, a coefficient for the ball speed and a coefficient for the bed speed are set in advance for each club type (a table of club type-coefficients is provided), and a coefficient corresponding to the club type is set for the ball speed or the head speed. The value multiplied is taken as the estimated flight distance. The presence / absence of the ball may be designated manually by manual operation, or various sensors may be provided and automatically recognized by the apparatus.

  In the case of the measurement mode, the display parameter is selected by “short pressing” the mode select button B2. That is, as shown in FIG. 3, two columns of three-digit numerical display parts using 7 segments are prepared in the lower area of the display 15, with the upper row representing speed (head speed / ball speed) and the lower row representing “estimated flight”. Display either “distance” or “meet rate”. Therefore, three types of display patterns are available: “Head Speed & Estimated Flight Distance”, “Ball Speed & Meet Ratio”, and “Ball Speed & Estimated Flight Distance”, and when a club type other than putter is selected. By “short press” of the mode select button B2, either “head speed & estimated flight distance” or “ball speed & meet rate” are alternately selected. If a putter is selected, only “ball speed & estimated flight distance” is forced.

  The first microcontroller 14 informs the display 15 of the currently displayed type. That is, the upper row displays either “HEADSPEED” or “BALLSPEED”, and the lower row displays either “MEET” (for meet rate) or “DIST” (for estimated flight distance). .

  When the club select button B3 and the mode select button B2 are pressed at the same time, the first microcontroller 14 switches the speed unit. Two types of speed display units prepared in the present embodiment are prepared: “m / s” (meter / second) and “mph” (mile / hour). The first microcontroller 14 displays the selected speed display unit on the display 15.

The club select button B3 is a button for selecting and designating the club type in accordance with the club to be used. Thereby, the first microcontroller 14 can calculate the estimated flight distance from the selected club type and information such as the head speed and the ball speed. Specifically, when the first microcontroller 14 recognizes “short press” of the club select button B3, the first microcontroller 14 circulates the club types in the following order.
“1W → 3W → 5W → 3I → 4I → 5I → 6I → 7I → 8I → 9I → W (Wedge) → Pt (Putter)”

  In addition, the first microcontroller 14 uses the “W, I, t and 7 segments” as appropriate in the club type display area on the upper right of the display 15 in accordance with the circulation of the club type. Display species. That is, when wood (1W, 3W, 5W) is selected, the number selected as “W” is displayed and the iron (3I, 4I, 5I, 6I, 7I, 8I, 9I) is selected. If “I” is selected, the number selected as “I” is displayed. If the wedge (W) is selected, only “W” is displayed and the pattern (Pt) is selected. Displays only “t” (P can be displayed together with 7 segments).

  This club type is selected in advance before the swing because it is used as a coefficient reference condition when calculating the estimated flight distance. When Pt (Patter) is selected, the unit of the estimated flight distance is automatically “m” (meter).

  In the present embodiment, the speed is calculated based on the data for each period, the data that may be erroneously detected is discarded, and the speed is determined based on the remaining reliable data finally. Therefore, the displayed speed is accurate without being affected by the surrounding conditions. Further, when the head speed is measured in a state where the ball is actually hit, the ball jumps out vigorously after the impact, so that the moving speed of the ball is sufficiently higher than the head speed, and the output of the Doppler sensor 11 is The Doppler signal generated during the distance from when the head 2a of the golf club 2 enters the detection range of the Doppler sensor 11 to a position where it is assumed to impact the ball is likely to be based on the movement of the ball. Since the periodic data is stored in the memory 22 only for the specified number of times corresponding to the wave number of 110, the swing speed can be correctly measured regardless of the presence or absence of the ball.

  The second microcontroller 17 serving as the ball speed calculating means may be in a predetermined low power consumption state after the ball speed is calculated until the next swing determining means determines that the head has swung.

  That is, power is constantly supplied to the Doppler sensor 11 and the first microcontroller 14 (swing determination means, first accumulation means, and head speed calculation means), while the second microcontroller 17 (second accumulation means and ball speed calculation). Means), when the calculation of the ball speed is completed and the output of the data of the calculated ball speed is completed, the supply of power is stopped, and then the first microcontroller 14 which is the swing determination means has a head swing. If determined, the supply of power to the second microcontroller 17 may be resumed. Alternatively, while the power is always supplied to the Doppler sensor 11 and the first microcontroller 14, the second microcontroller 17 completes the calculation of the ball speed, and when the output of the calculated ball speed data is completed, the power saving mode Then, when the first microcontroller 14 determines that there is a head swing, the power saving mode may be switched to the normal mode.

DESCRIPTION OF SYMBOLS 10 Head speed measuring device 11 Doppler sensor 12, 12a Amplifier 13, 13a Comparator 14 1st microcontroller 15 Display 16 Switch group 17 2nd microcontroller 20 Case 21 Counter 22 Memory

Claims (10)

A portable speed measuring device for calculating a head speed at the time of swing of rubber Rufukurabu,
Has a function to display the calculated head speed,
A speed measuring apparatus comprising a function of blinking and displaying the speed for a predetermined time after the head speed is calculated . A function of calculating a ball speed of a ball launched by a swing of the golf club;
It has a function to display the calculated ball speed,
The speed measuring apparatus according to claim 1, further comprising a function of blinking a display of the speed for a predetermined time after the ball speed is calculated .   Provide a function to calculate and display the meet rate based on the calculated head speed and ball speed
  The speed measuring device according to claim 2 characterized by things.   Provide a club type selection function and a function to calculate and display the estimated flight distance based on at least one of the calculated head speed and ball speed.
  The speed measuring device according to claim 2 or 3, wherein   When a speed corresponding to the ball speed is not detected, it is determined that the swing is without a ball, and a function of calculating and displaying an estimated flight distance based on the calculated head speed is provided.
  The speed measuring device according to any one of claims 2 to 4.   Two types of numerical display parts are prepared, the upper row displays the head speed or ball speed, the lower row displays either “estimated flight distance” or “meet rate”, and the type currently displayed on the upper and lower rows Provide a function to display
  The speed measuring device according to any one of claims 2 to 5.   It has a club type selection function, and when the putter is selected as the club type, the ball speed and the estimated flight distance are forcibly displayed.
  The speed measuring device according to claim 6.   When the putter is selected as the grab type, the unit of the estimated flight distance is automatically set to “m” (meter).
  The speed measuring device according to claim 7 characterized by things.   Battery powered,
  After calculation of the ball speed, a predetermined low power consumption state is maintained until it is determined that the golf club head has swung next.
  The speed measuring device according to claim 1, wherein:   For each swing of the golf club, a “measurement mode” that measures and displays various characteristics associated with the swing, and a “training mode” that allows the user to go around the virtual golf course assuming a virtual golf course,
  Changing the presence / absence of the logo display when switching between the “measurement mode” and the “training mode”
  The speed measuring device according to claim 1, wherein:

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