JP2008513102A - Biofeedback method and biofeedback system, golf swing tempo measurement system - Google Patents

Abstract

A biofeedback system including an elongated member, for feeding back sounds indicative of swing tempo of the elongated member is provided. The system comprises a plurality of acceleration measuring devices adapted to measure accelerations at a plurality of locations along the elongated member; a first microcontroller for processing the measured acceleration signals to reduce effects of gravity and forming a digital number related to an angular rotational speed raised to a power; said digital number comprising a plurality of bits; a second microcontroller for receiving the digital number and associating the bits with a plurality of groups each having an associated tonal composition and amplitude value indicative of bit content and for forming commands indicative of the tonal composition and amplitude value; and a synthesizer responsive to commands and producing an audio signal; and means for outputting the audio signal.

Description

  The present invention relates to a device for providing biofeedback by sound corresponding to movement and tempo of a golf swing or the like as a tempo measurement system or the like of a golf swing.

  In order to repeat the same swing in any sport such as golf, tennis, fishing, bowling, and baseball, it is important to swing a long object at a constant tempo. Once a correct swing is obtained under a certain situation in a game (game), the swing should be able to be repeated in the same situation. Here, the constant tempo means that the speed change during the swing is repeated no matter how many times the swing is performed.

  In addition, it is generally very difficult for athletes to obtain a sense of a predetermined tempo in a swing such as a long object in various sports. This is because the sensation of the athlete who feels fast and slow changes daily and from moment to moment depending on the mood and adrenaline level. Even when using video equipment, it is more complicated to obtain consistent movement. This is because the competitor will generally distract from the point that should be more focused. In addition, training is generally more focused on what the person around it feels and feels than the athlete himself, while these people give the athlete a swing speed and tempo. It is almost difficult to convey. Therefore, a method for allowing the athlete to quantitatively sense the tempo without interfering with the swing movement effectively promotes the athlete's training and exercise.

  Also, the natural way to make the athlete feel the tempo is through sound and music, which allows the athlete to concentrate on the swing. By giving the athlete a constant opportunity to listen to universal music in all cultures, the athlete becomes sensually accustomed to the timing corresponding to the tempo based on the acoustic sense.

  Also, the player's instantaneous movement in the golf swing occurs faster than the player's conscious control, and the control speed and tempo are extremely important to obtain a reliable and reproducible swing movement. Furthermore, muscle memory that unconsciously adjusts muscle activity can be learned through repeated exercises at the correct tempo. Therefore, the acoustic method is an excellent mechanism that can give the player unintentionally swing tempo information without diverting the player's attention.

  Here, the tempo of the golf swing is a change in the speed of the golf swing when the golf club passes through a circular trajectory drawn while hitting the ball between the back swing and the follow-through. Since the golf swing is dominated by the movement of the circular locus, the golf swing shows a temporal history or tempo of the angular velocity of the club. Further, since the centripetal acceleration of the object moving within the circular motion is a function of the angular velocity of the object, the accelerometer provided in the vicinity of the golf club outputs a signal indicating the tempo.

The centripetal acceleration at a specific point on the swinging golf club can be measured by an accelerometer provided at that point, and the detection axis is the same as the axis of the shaft. Generally, this centripetal acceleration a _c can be instantaneously measured as the square of the angular velocity of the golf club using the relational expression of a _c = ω ² r. Here, ω is an angular velocity, and r is an effective radius when the accelerometer moves.

  However, in the prior art, it has been found that there is an error in measurement due to the influence of gravity. The error signal that blends into the desired centripetal acceleration can be reduced or eliminated by performing differential measurements using two accelerometers located at different locations along the shaft axis. That is, each accelerometer detects the same gravitational acceleration, but the centripetal acceleration is measured based on the effective radius of the golf club motion.

  However, obtaining sufficient benefits by using accelerometers and acoustic feedback attached to a golf club is rather difficult without effort. For example, US Pat. No. 6,261,102 (Patent Document 1) discloses a technique for converting the output of an accelerometer into an acoustic signal for biofeedback. By aligning the axis of the accelerometer with the axis of the golf club, the accelerometer measures centripetal acceleration and determines the square of the angular velocity of the golf club based on the measured value. Next, a signal proportional to the square of the angular velocity of the golf club is converted to a frequency and provided to the user as an acoustic signal. However, due to insufficient compensation for the gravitational action, the sensitivity is insufficient and large speed changes in the golf swing tend to produce an unpleasant “chirp like sound”.

  The other two prior art patents have similar problems. Specifically, US Patent No. 5,233,544 (Patent Document 2) granted to Kobayashi has many accelerometers attached along the golf club shaft, but may cause problems in sound quality. And does not disclose or suggest any use of multiple tones provided by the present invention. Furthermore, Kobayashi uses the angular velocity itself rather than the square signal of the angular velocity, so it cannot give good sensitivity by the square signal of the angular velocity.

US Pat. No. 5,694,340 to Kim also discloses the use of multiple accelerometers that similarly develop acceleration signals, but eliminates the harmful effects caused by gravity. It does not disclose or suggest any benefit from using multiple accelerometers. Moreover, although Kim uses a number of frequencies, these frequencies are used to distinguish between the three axes, and are used to remove chirp sound and improve sound quality. It is not done.
US Patent No. 6,261,102 US Patent No. 5,233,544 US Patent No. 5,694,340

  Therefore, further improvements are required in this technical field. In particular, in one of the exercise equipment, such as a golf club (but not specifically limited), eliminates the effect of linear acceleration (not due to rotational movement) such as gravity that occurs along the axis of the golf club, or It would be desirable to provide a biofeedback system that uses a squared angular velocity that can be reduced and that enhances sensitivity and enhances sound effects, creating a pleasant sound with tone elements and amplitude changing to indicate tempo. Thus, the present invention overcomes the aforementioned drawbacks by realizing the objects and advantages described herein.

That is, an object of the present invention is to solve the lack of sensitivity in the prior art.
Another object of the present invention is to provide an apparatus for displaying a swing tempo that is improved by canceling the influence of the center of gravity.

  Another object of the present invention is to improve the measurement sensitivity of tempo changes using a signal related to the square of the angular velocity.

  Another object of the present invention is to provide improved acoustic feedback using tone elements and amplitudes that are comfortable to the ear.

  It is another object of the present invention to provide a system for storing a measurement signal and information and commands obtained from the measurement signal for later playback and analysis.

  It is a further object of the present invention to provide an improved acoustic feedback method using a radio link carrying a biofeedback signal.

In general, the present invention provides a biofeedback system that includes a long member and that feeds back synthesized speech indicating the swing tempo of the long member.
A biofeedback system as a preferred embodiment of the present invention includes a plurality of acceleration measuring devices arranged to measure acceleration at a plurality of positions along the length of a long member, and processes the measured signals. A first microcontroller for reducing the influence of gravity and forming digital number data including a plurality of bit information correlated to a power of an angular velocity; a digital number data including a plurality of bit information; and the digital number data Are associated with a plurality of groups each including a tone component and an amplitude value corresponding to the bit information, and a second microcontroller for forming a command corresponding to the tone component and the amplitude value, and the command A synthesizer that responds and creates an acoustic signal and means for outputting the acoustic signal; Is Dressings.

  According to a preferred embodiment of the present invention, there is provided a method of generating a plurality of acceleration signals indicating the acceleration of a long member at a different position in the longitudinal direction of the long member, processing the acceleration signal, Corresponding to group-specific digital values, reducing the effects of gravity on the surface, forming a series of digital samples, each of which contains acceleration information and a plurality of bit information correlated to the power of the angular velocity Determining a group corresponding to a plurality of bit information in the digital sample, and generating a command for forming a synthesized sound representing the tone component and the amplitude value in the group. And a step of feeding back the synthesized sound.

  In addition, a system according to another embodiment of the present invention includes a plurality of sensors coupled to the long member for extracting a digital signal corresponding to the movement state of the long member, and processing the digital signal. Reduces the influence of gravity and generates multi-bit digital number data correlated to the power of angular velocity, and multi-bit digital number data into multiple groups each containing tonal components and amplitude values corresponding to bit information Means for associating; synthesizer for generating an acoustic signal in response to the command; and means for outputting the acoustic signal.

  According to another embodiment of the present invention, there is provided a method of attaching a plurality of sensors attached along a longitudinal direction of a long member in order to extract a digital signal corresponding to a motion state of the long member. The digital signal is processed to remove the effects of gravity and to generate multi-bit digital number data correlated to the power of the angular velocity in at least two locations along the elongate member, and Mapping data to a plurality of groups each having a tone component and amplitude corresponding to information of the multi-bit digital signal; and synthesizing an acoustic signal having a tone component and amplitude corresponding to the group-specific bit value; Outputting an acoustic signal.

  A system according to another embodiment of the present invention is a biofeedback system for converting a motion characteristic of a long member into a voice, and the long length is used to capture a motion parameter as multi-bit digital number data. A plurality of sensors arranged along the longitudinal direction of the member, a processing device for mapping multi-bit digital number data to a plurality of groups each having tone components and amplitude values corresponding to bit information, and mapped A synthesizer for generating an acoustic signal in response to the multi-bit digital number data, and means for outputting the acoustic signal.

  The method associated with the system also includes the step of positioning a plurality of sensors arranged along the longitudinal direction of the elongate member to supplement the motion parameters as multi-bit digital number data; Are mapped to a plurality of groups each having a tone component and an amplitude value corresponding to bit information, and an acoustic signal is created in response to the data of the multi-bit digital number to correspond to the bit information. Generating an acoustic signal having a tone component and an amplitude value, respectively, and outputting the acoustic signal

  Further, as a specific embodiment, the long member is a golf club.

  Hereinafter, as a specific example, an embodiment of the present invention will be described by taking a golf club which is one of long members as an example.

  Here, the drawings do not show all the features of the present invention, and in the drawings, similar or identical components are denoted by the same reference numerals.

  First, the present invention will be described with reference to FIGS. In the figure, numeral 100 indicates a biofeedback system according to the present invention, and numeral 200 indicates a golf club according to the present invention. The present invention also relates to an acoustic biofeedback device together with the golf club 200. The biofeedback system 100 preferably includes an arithmetic processing device 300 and a monitor 250. In this embodiment, the arithmetic processing device 300 and the monitor 250 are connected to each other wirelessly, and can also be connected to the golf club 200 wirelessly.

  The golf club 200 includes a long member 215, and the long member 215 includes at least one shaft, and the club head 230 can be attached to the long member 215. A first accelerometer 220 and a second accelerometer 225 are attached to the elongated member 215. When the elongate member 215 is swung, the accelerometers 220 and 225 monitor the acceleration along the axis of the elongate member 215.

  Preferably, within member 215 are two A / D converters 254, 255 operatively connected to accelerometers 220, 225, respectively, and a microprocessor 260 connected to these converters 254, 255; A circuit 245 comprising a wireless transceiver 265 connected to the output end of the microcontroller 260 is mounted. The microprocessor 260 calculates the difference between the digitized outputs of the accelerometers 220 and 225 and transmits the information to the arithmetic processing unit 300 via the antenna 235. Specifically, the accelerometer provided in the club head is also regarded as an accelerometer provided along the long direction of the long member.

  The arithmetic processing unit 300 receives the data transmitted via the antenna 315, acoustically incorporates a signal described below, and then outputs it as a biofeedback acoustic signal to the speaker 355 or the monitor 250 in a known manner. To do. The monitor 250 may include an earphone 252 and a small portable receiver 256. In other embodiments, the user may wear an integrated receiver and headset.

  The general background art will be described with reference to FIG. 3. A golf club 200 with accelerometers 220, 225 having a swing analysis parameter indicated generally at 205 and having a measurement axis equal to that of the golf club 200 is shown. It is shown. A player (not shown) having the arm 105 and the wrist 110 swings the club 200 having the head 230 so as to draw a circular motion 135 around the wrist 110 at an angular velocity ω rad / s in order to hit the ball 140.

Here, the centripetal acceleration at a specific point on the swinging club can be measured using an accelerometer provided at the specific point and having a detection axis equal to the axis of the long member. Generally, this centripetal acceleration a _c is used to instantaneously measure the angular velocity of the club using a relational expression of a _c = ω ² r. Here, ω is an angular velocity of the club head (assuming an accelerometer near the head or the head), and r is an effective radius at which the accelerometer moves.

In order to estimate the maximum value of the acceleration, it is noted that the player can swing at a club head speed of about 100 mph. The typical radius that forms the circular motion that the club head moves is on the order of 5 feet (1.5 m), but the accelerometer is usually at a position of about 4.5 feet (1.35 m). From this, the maximum measured value of the centripetal acceleration is about 1200 m / s ² . Generally, when standardized by gravitational acceleration of 9.8 m / s ² , it becomes about 120 g. This is useful as a means of defining the dynamic range required for measurement.

The measurement error is due to the influence of gravity. The accelerometer measures all accelerations received along the detection axis. The earth's attractive force is 9.8 m / s ² with a constant acceleration, expressed in 1 g, and works toward the center of the earth. The direction of gravitational acceleration is represented by an arrow “g” and is defined as a vertical direction in the present invention.

  As shown in FIG. 3, the directivity of the golf club 200 with respect to the direction of the gravitational acceleration g changes as the club head 230 moves along the trajectory 135. This change in directionality causes a time-varying error signal related to gravitational acceleration and appears in the outputs of the accelerometers 225 and 220.

Thus, the error signal can be added to the desired centripetal acceleration signal and is eliminated by making a differential measurement using data from accelerometers 220 and 225 located at r ₁ and r ₂ , respectively. As those skilled in the art will recognize, each accelerometer detects the same gravitational acceleration, but cannot detect the magnitude of centripetal acceleration according to the effective radius of motion. To summarize this,

Here, a ₁ is the acceleration measured by the accelerometer 220.

  Here, a2 is the acceleration measured by the accelerometer 225. g · r represents the magnitude of gravitational acceleration along the axis of the long member. Taking the difference between Equation (1) and Equation (2), the following is obtained.

This difference is proportional to ω ² (square of angular velocity), but is a value that does not depend on the gravitational acceleration. Here, (r ₂ −r ₁ ) is a constant.

  From equation (3), it is clear that the generated signal is optimized by placing the two accelerometers as far apart as possible. Thus, it is desirable to place one accelerometer in the vicinity of the grip end and the other accelerometer in the vicinity of the head end, and this condition is illustrated in this preferred embodiment.

A representative plot of ω ² , the square signal of angular velocity, is shown in FIG. FIG. 5 shows the relationship between the square root of the signal in FIG. 4, that is, the angular velocity ω. 4 and 5, it can be understood that if the ω ² signal, which is a square signal of the angular velocity, is used, the sensitivity can be improved and the output level can be greatly changed with respect to the change of the swing velocity. Also, ω ² is a measure of the mechanical rotational energy of the club.

The present invention is an omega ² signals, a system for providing the bit mapping or to associate represented by 12-bit digital substantially instantaneous acceleration difference value, a unique sound in each group incorporated into the interval of the bit group. That is, one or a plurality of devices make chords and note sounds. Each group is given its own sound, the magnitude of each sound is changed as a function of the bit value in the group, and information is added to the biofeedback acoustic signal so that the difference in swing tempo can be recognized. As an overall effect, it is possible to change the tone element and the amplitude value while maintaining the harmony relationship of chords and avoiding frequency chirp.

  Also, the preferred embodiment of the present invention uses a MIDI wavetable generator to generate a unique sound for the selected group.

  Description will be made with reference to FIGS. 1 and 2 again. Since the accelerometer 225 is located in the vicinity of the club head 230, it reads a higher acceleration of the two centripetal accelerations. The accelerometer analog output is sent to A / D converters 254, 255 where it is converted to a digital data stream and sent to microprocessor 260 via serial link 262 for processing. The preferred embodiment includes a microchip MCP3210 12 pit A / D converter for converting the accelerometer analog output to a digital data stream for delivery to the microprocessor 260, but preferably a microchip 8-bit microcontroller. It is PIC16F873A.

  Further, the microprocessor 260 subtracts the accelerometer reading, formats the resulting 12-bit NRZ data, and transmits it from the transceiver 265 to the arithmetic processing unit 300. In another embodiment, the subtraction is performed by the arithmetic processing unit 300.

  Also, the transceiver 265 preferably receives the NRZ serial data from the microprocessor 260, reformats the data into synchronous Manchester coding and sends it to the antenna 235 at 915 MHz and transmits and receives CC1000 from Chipcon. Machine. The initialization value includes the data format and frequency selection, is stored in a flash memory in the microprocessor 260, and is sent to the transceiver 265 via the serial link 266. Acceleration data from the microcontroller 260 is sent to the transceiver 265 via the serial link 264.

The selection of a suitable accelerometer for the preferred embodiment proceeds as follows. As described above, the accelerometer is mounted at about 4.5 feet from the grip end of the elongate member 215 with a typical radius defining circular motion of about 5 feet, a club head speed of about 100 mph, and an accelerometer mounted about 4.5 feet from the grip end of the elongated member 215. The acceleration by 225 is about 1200 m / s ² or about 120 g. Therefore, a suitable accelerometer is one having a g range of 120 g, such as the analog device ADXL193 (AD22282). In other embodiments, particularly for fast swinging golfers, accelerometers with a g range of 250 g, such as ADXL193 (AD22282), are used, and in a third embodiment for relatively slow swinging golfers, the accelerometer is , ADXL78 (AD22280) or the like having a g range of 50 g may be used. In other embodiments, the accelerometer 220 has a lower grade than the accelerometer 225 because it is closer to the grip 222 and thus has a lower centripetal acceleration than the accelerometer 225. For this last embodiment, the output of accelerometer 220 is preferably increased or decreased to facilitate subtraction of equations (1) and (2) to obtain equation (3).

  Alternatively, a plurality of accelerometers of the type described above may be provided so that they can be selected by a switch (not shown) attached to the club 200. As a result, a plurality of golfers having different swing speeds can use the same club, and the same golfer can be used at a plurality of swing speeds that are greatly different from each other. In another embodiment, the accelerometer may be selected by a wireless link between the transceiver 265 and the transceiver 330.

  FIG. 6 is a block diagram of a circuit in the arithmetic processing unit 300. The 12-bit data transmitted by the transceiver 265 and the antenna 235 is received by the antenna 315, demodulated into an NRZ code by the transceiver 330, and sent to the microcontroller 335 via the NRZ serial stream. Serial buses 332 and 334 are used for communication between blocks 330 and 335, serial bus 337 is used for communication between blocks 335 and 340, and bus 342 is used for communication between blocks 340 and 345.

  The microcontroller 335 is preferably a PIC16F837A, which receives a 12-bit digital data stream and maps the bits of the 12-bit acceleration signal into six groups. Groups 1-4 contain 9 bits, group 5 contains 8 bits, and group 6 contains 7 bits. The bits defined in each group in the preferred embodiment are shown in Table 1.

Each group of bits is treated as a word, and the microcontroller 335 calculates the value of this word. For example, if the word b ₈ -b ₀ is 000001010, the value of the word is 10.
For groups with non-zero word values, the microcontroller 335 preferably transmits a MIDI command to the synthesizer 340 to turn on a particular group of beep sounds and a value proportional to the word value of the turned-on group. Command the belief of a group that is equal to ON. The generated MIDI command communicates with the synthesizer 340 continuously. The synthesizer 340 interprets the NIDI command and converts it into a biofeedback signal value, as will be described in detail below. In the preferred embodiment, a CRYSTAL single chip wavetable music synthesizer CS9236 compliant with the General MIDI standard is used. In another embodiment, tone groups are pre-recorded, and these tone groups are recalled from memory and combined to form a synthesizer biofeedback signal.

Also in the preferred embodiment, synthesizer 340 is programmed by microcontroller 335 to associate each group with a particular MIDI channel. Each MIDI channel is programmed to produce a specific chord in the preferred embodiment and includes two notes, musically known as the fifth note, the root note and its full fifth pitch. When using the fifth sound of the fundamental frequency _{f 0,} a frequency of the associated fifth sound is 1.5f _0. Other chord relations can be selected by operating switches with the panel control 370 of FIG. In yet another embodiment, a series of pitches having different chord relationships may be used, or a series of pitches having no chord relationship may be used. The preferred instrument for all groups is the rock organ, but other instruments for all groups or different instruments for each group can be selected by the panel control 370.

  Table 2 shows the pitch group relationship or tone structure of the preferred embodiment. Here, C4 indicates the center C (about 261.6 Hz), C3 indicates the lower octave (approximately 130.8 Hz), C5 indicates the upper octave (approximately 523.2 Hz), and the like.

The amplitude value (volume value) of the sound of each MIDI channel is determined by the bit value of the corresponding group. For example, in group 1, the volume value is defined by bits b ₈ -b ₀ of the 12-bit complete signal. Here, b ₀ is the least significant bit. When the word value of bits b ₈ -b ₀ is between 0 and 127, the output volume value is determined in proportion to the word value. When the word value is between 128 and 255, the output volume value is limited to a value proportional to 127. When the word value is between 256 and 511, the output volume value is determined to be equal to (511−word value of intra-group bit) / 2. As a result, a waveform of group 1, for example, a waveform in which the volume value increases to the maximum value 127 by the square of the angular acceleration, stays at 127, then becomes a negative gradient, and returns to 0 while further increasing the angular acceleration. . This amplitude value characteristic is shown in FIG.

  This basic process is the same for all groups. Each group of 1 to 4 is defined by 9 bits, and the amplitude value is matched with the amplitude value curve shown in FIG. Group 5 is defined by 8 bits and group 6 is defined by 7 bits, and these amplitude value characteristics reach 127 respectively, and have a negative gradient although not in the reverse direction. FIG. 8 shows the organization results of the pitch and volume values of all groups. The net effect is volume value change and tone components, which are accompanied by an increase in signal in a format that can maintain chord relationships and avoid frequency chirp. While Table 2 shows each chord associated with a particular channel, other embodiments provide multiple chords in one or more channels.

  Further, the processing device 300 includes a flash memory 365, and stores data (a format of MIDI command and 12-bit acceleration data) in which sound effects are incorporated. The MIDI command is preferably used for playback during practice, but the 12-bit acceleration data can be used in conjunction with a personal computer instead of the processor 300, or for other sound and sound effect experiments.

  Information can also be downloaded from the processing device 300 via the data port 375, but in other embodiments it can also be retrieved by a memory card. Similarly, other sound effect mechanisms can be uploaded to the processor 300 via the data port 375 and selected from the control panel 370 at the player's option.

  Also, the output of the synthesizer 340 is a digital data stream representing an angular velocity square signal incorporating the acoustic effect, and is the magnitude of the rotating machine energy of the club. This signal is sent to the D / A converter 345 for conversion to an analog value. This analog value is sent to the audio amplifier 360 and the speaker 355. The analog signal from the D / A converter 345 is also available at a connector (not shown) that is optionally connected to a radio transmitter 350 having an antenna 320. The wireless transmitter 350 is used for transmission via radio waves, but infrared signals are used in other embodiments.

A further feature of the present invention is that golf swing curves having the general shape of FIG. 4 can be superimposed. Therefore, they can be compared with each other to visually display (and compare) the swing tempo of a swing repeated between one user or various users. Such information can then be stored so that it can be viewed again later, and for example, a user in the home can be visibly contacted. In this way, the user can analyze the golf swing of a professional golfer who uses the golf club 200 of the present invention, for example.
Thus, the present invention has many advantages over the prior art. For example, the present invention includes acoustic feedback using an angular velocity square value that incorporates an acoustic effect, correction of the angular velocity square value of gravitational acceleration, and represents a swing speed. The amplitude value is used.

  Although the invention has been particularly described with reference to preferred embodiments thereof, it is obvious that those skilled in the art can make changes in form and detail without departing from the scope and spirit of the invention. is there. For example, when the microprocessor is required to have a predetermined speed in order to perform the methods and functions described above, all the functions can be provided as a single unit in the form of a microprocessor function. Therefore, the arrangement of the components as described above is typical and is not limited to this.

  Similarly, in the above description of the number to be a power of angular velocity, all of the above description has been described as substantially 2, but even if someone changes this amount slightly, the claim is not so limited. Absent. Accordingly, it is described here as at least about 2 (preferably but precisely). Further, an accelerometer placed along the longitudinal direction of the elongate member can be mounted within or on the elongate member, all of which are within the scope of the claims of the present invention. is there.

  Finally, similarly, the sensor may not be physically attached, for example, on the wall surface of the long member, that is, it may be attached separately by a predetermined distance. In this case, the claims include embodiments in which the acceleration of the elongated member is measured by one or more sensors physically separated from the elongated member.

It is explanatory drawing of the biofeedback apparatus comprised by this invention. 1 is a block diagram of an electronic circuit mounted in a golf club according to a preferred embodiment of the present invention. These are the conceptual diagrams used for the analysis of the golf swing using a golf club (however, it is applicable similarly to the analysis of the swing of a long member like a tennis racket, for example). It is a graph which shows the data characteristic of the square of the typical angular velocity in the form of FIG. It is a graph which shows the data characteristic of the typical angular velocity in the form of FIG. It is a block diagram of the process part in the preferable Example of this invention. It is the graph which plotted the amplitude characteristic of the single tone group. It is a graph which shows the amplitude characteristic of the whole tone group used in order to represent 12-bit digital data of this invention.

Claims (12)

A biofeedback system comprising a long member and feeding back synthesized speech indicating the swing tempo of the long member,
A plurality of acceleration measuring devices arranged to measure acceleration at a plurality of positions along the longitudinal direction of the elongate member;
A first microcontroller for processing the measured acceleration signal to reduce the influence of gravity and to form digital number data correlated to a power of angular velocity;
The digital number data including a plurality of bit information;
A second microcontroller for receiving the digital number data and associating with a plurality of groups each including a tone component and an amplitude value corresponding to the bit information, and forming a command corresponding to the tone component and the amplitude value When,
A synthesizer for generating an acoustic signal in response to the command;
A biofeedback system comprising: means for outputting the acoustic signal.   The biofeedback system according to claim 1, wherein a power of the angular velocity is at least substantially 2. A biofeedback method for feeding back a synthesized sound indicating the swing tempo of a long member,
Generating a plurality of acceleration signals indicating the acceleration of the long member at different positions in the longitudinal direction of the long member;
Processing the acceleration signal to reduce the effect of gravity on the acceleration signal;
Forming a series of digital samples, wherein the acceleration signal is processed and each includes a plurality of bit information correlated to a power of angular velocity;
Determining a group corresponding to a plurality of bit information in the digital sample among each group having an acoustic component and an amplitude value corresponding to a group-specific digital value;
Generating a command for forming a synthesized sound representing a tone component and an amplitude value in the group;
Feeding back the synthesized sound; and a biofeedback method. A biofeedback system comprising a long member and feeding back synthesized speech indicating the swing tempo of the long member,
A plurality of sensors connected to the elongate member for extracting a digital signal corresponding to the motion state of the elongate member;
The digital signal is processed to reduce the influence of gravity and generate multi-bit digital number data correlated with the power of the angular velocity, and the multi-bit digital number data is converted into a tone component corresponding to the bit information and Means for associating with a plurality of groups each containing an amplitude value;
A synthesizer for generating an acoustic signal in response to the command;
A biofeedback system comprising: means for outputting the acoustic signal.   The biofeedback system according to claim 4, wherein a power of the angular velocity is at least substantially two. A biofeedback method for feeding back audio representing the swing tempo of a long member,
Attaching a plurality of sensors attached along the longitudinal direction of the elongate member to extract a digital signal corresponding to the motion state of the elongate member;
The digital signal is processed to remove the influence of gravity, and at least two locations along the elongated member generate multi-bit digital number data correlated with the power of the angular velocity, and the multi-bit digital Mapping a number of data to a plurality of groups each having a tone component and amplitude corresponding to the information of the multi-bit digital signal;
Synthesizing an acoustic signal having a tone component and an amplitude value corresponding to a group-specific bit value;
Outputting the acoustic signal; and a biofeedback method. A biofeedback system that converts the motion characteristics of a long member into speech,
A plurality of sensors arranged along the longitudinal direction of the elongate member to capture motion parameters as multi-bit digital number data;
A processor that maps the multi-bit digital number data to a plurality of groups each having a tone component and an amplitude value corresponding to bit information;
A synthesizer that produces an acoustic signal in response to the mapped multi-bit digital number data;
A biofeedback system comprising: means for outputting the acoustic signal. A biofeedback method for providing a biofeedback signal to a user using a sensor to capture the motion characteristics of an elongate member,
Disposing a plurality of sensors disposed along the longitudinal direction of the elongate member to supplement motion parameters as multi-bit digital number data;
Mapping the multi-bit digital number data to a plurality of groups each having a tone component and an amplitude value corresponding to bit information;
In response to the multi-bit digital number data, creating an acoustic signal to generate an acoustic signal having a tone component and an amplitude value corresponding to the bit information;
Outputting the acoustic signal; and a biofeedback method.   The biofeedback system according to claim 1, wherein the elongated member is a golf club.   The biofeedback system according to claim 4, wherein the elongated member is a golf club.   A long member using the biofeedback system according to claim 1.   A long member using the biofeedback system according to claim 4.

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