JP2005037922A - Apparatus for specifying beating position and electronic musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify the beating position as fast as possible from the instant of beating and to accurately identify the beating position even when the output level of detection signals fluctuates. <P>SOLUTION: The drum head 210 of an electronic drum system 200 is provided with sensors Y1, Y2, X1, X2 at four positions located at an equal distance from the center O. In the electronic drum system 200, the time difference ΔTy of the stating time of vibration detected by the sensors Y1 and Y2 is measured while the time difference ΔTx of the starting time of vibration detected by the sensors X1, X2 is measured. The beating position BP is specified by using the time differences ΔTy and ΔTx. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a device such as an electronic percussion instrument having a function of detecting a hit by a user, and more particularly, to a percussion position specifying device that specifies a hit position and an electronic percussion instrument equipped with the hit position.

  2. Description of the Related Art Conventionally, an electronic percussion instrument such as an electronic drum system is generally configured to detect a striking intensity applied to a drum head and output a tone having a volume corresponding to the detection result. Here, an acoustic percussion instrument such as a snare drum has a characteristic that even if the impact strength applied to the drum head is the same, the tone changes in accordance with the change of the hit location. In recent years, electronic percussion instruments capable of detecting percussion positions as well as percussion positions and outputting musical tones according to the two types of detection results are appearing in order to reproduce the characteristics of this acoustic percussion instrument even with electronic percussion instruments. is there.

  The following techniques are known as techniques for detecting the hitting position in this type of electronic percussion instrument. For example, Patent Document 1 discloses a technique (referred to as Prior Art 1) in which a vibration sensor such as a piezoelectric element is provided in the center of a drum head and a striking position is detected according to a detection signal from the vibration sensor. More specifically, the detection signal from the vibration sensor has a characteristic that the maximum value of its output level increases as the impact strength increases even if the distance between the impact position and the detection position of the vibration sensor is the same. In addition to this, the detection signal has one polarity in a predetermined period (corresponding to “first predetermined time” in Patent Document 1) from the rising edge according to the distance between the detection position and the hitting position even if the hitting strength is the same. It has a characteristic that the maximum value of changes. In the prior art 1, using these characteristics, the maximum value of the detection signal is detected, and the maximum value of one polarity in a predetermined period is detected, and the two types of detected maximum values are individually associated with each other. The hitting position is specified based on the two types of tables.

  As another conventional technique, Patent Document 2 discloses a technique in which two sensors having different detection characteristics are provided in a drum head and a striking position is detected according to the detection results (conventional technique). Technology 2). More specifically, one of the two sensors provided in the drum head is a pressure-sensitive sensor that outputs a detection signal corresponding only to the strength of the impact, and the other is a sensor up to the impact position in addition to the impact strength. It is a vibration sensor that outputs a detection signal corresponding to a distance. In the prior art 2, the distance from the reference point on the drum head to the striking position is obtained by referring to the reference point sensor output table using the output levels of the detection signals from these two sensors. Here, the reference point sensor output table is a table in which the output level of the detection signal from each sensor when the reference point is hit with stepwise intensity is associated with the hit intensity at that time. By using the hitting position detection technique as described above, it is possible to output a musical sound reflecting the hitting position even in an electronic percussion instrument.

JP 10-198364 A JP 2001-255871 A

  However, the prior arts 1 and 2 have the following problems. First, since the hit position is specified using the maximum value of the detection signal in the prior art 1, the calculation related to the specification of the hit position cannot be started until the detection signal takes the maximum value. For this reason, there has been a problem that a time lag occurs from when the musical instrument is hit to when the musical sound is electrically output. On the other hand, in the related art 2, the position is detected according to the output levels of the detection signals from the two sensors. For this reason, there is a possibility that an error in detection of the hitting position may occur due to variations in output level caused by individual differences between sensors.

  As mentioned above, taking the electronic percussion instrument as an example, the problems of the conventional hitting position detection technology have been described. However, such problems are not only electronic percussion instruments but also members that are hit by the user, such as operation pads for video games. In the device for identifying which position was hit, there was a problem that could occur in the same way.

  The present invention has been made in view of the above-described circumstances, and the object of the present invention is that it is possible to quickly specify the striking position from the time of striking, and even if the output level of the detection signal varies, An object of the present invention is to provide a striking position specifying device capable of accurately identifying a striking position and an electronic percussion instrument equipped with the striking position specifying device.

In order to solve the above-described problems, the present invention provides first and second detection means for detecting vibrations at different positions of a hit member that vibrates due to impact, and detection signals of the first and second detection means. Detecting means for detecting a vibration start time at each position and measuring a time difference between these vibration start times; a time difference measured by the measurement means; and a detection position at which vibration is detected by the first detection means. And a hitting position specifying device for specifying a hitting position at which the hit member is hit according to a detection position at which vibration is detected by the second detecting means. provide.
According to this hitting position specifying device, the hitting position is specified using the time difference between the vibration start times detected by the first and second detecting means, and therefore the time when the start of vibration is detected by the two detecting means. The calculation related to the identification of the hitting position can be started. For this reason, compared with the prior art 1 which has to wait until the detection signal takes a maximum value, it is possible to quickly specify the striking position from the time of striking. Further, according to the above configuration, the hitting position is specified using the time difference between the two vibration start times of the hit member, and therefore the hitting position can be accurately specified regardless of the output level variation between the detection signals. Can do.

  Here, the specifying means includes a time difference measured by the measuring means, coordinates of a detection position where vibration is detected by the first detection means, and a detection position where vibration is detected by the second detection means. It is good also as composition which specifies the hitting position by calculation using these coordinates, and a detection position where vibration is detected by the first detection means and a detection position where vibration is detected by the second detection means Corresponding to the time difference measured by the measuring means and the positional relationship from a table in which the positional relationship, the time difference, and positional information indicating the hit position of the hit member are associated. It is good also as composition which searches position information and specifies the hitting position.

Further, according to the present invention, the first and second detection means for detecting vibrations at different positions among the hitting members that vibrate due to impact, and the detection signals of the first and second detection means at the respective positions. Measuring means for detecting a vibration start time and measuring a time difference between these vibration start times; a time difference measured by the measurement means; a detection position where vibration is detected by the first detection means; and the second According to a detection position at which vibration is detected by the detection means, a specifying means for specifying a hit position hit in the hit member, and a sound according to the hit position specified by the specifying means is output as a sound There is provided an electronic percussion instrument comprising sound control means for outputting the sound to a device.
According to such an electronic percussion instrument, as in the above-described hitting position specifying device, it is possible to quickly specify the hitting position from the time of hitting as compared with the prior art 1, and the detection signal as compared with the prior art 2. Even if the output level varies, the hitting position can be accurately specified.

By the way, the structure which outputs a sound from a sound output means according to the level of the vibration detected by the detection means can also be considered. In this configuration, it is a correction coefficient for correcting the level of vibration detected by the detecting means for detecting the vibration of the hit member, and the vibration detects the level of vibration detected by the detecting means. A calculating means for calculating a correction coefficient for correcting the distance from the detected position to the striking position and a reference value of the vibration level, and the vibration level detected by the detecting means, It is preferable to further include a correction unit that performs correction using the correction coefficient calculated by the calculation unit, and the sound control unit outputs a sound corresponding to the level of vibration corrected by the correction unit.
According to this configuration, since the detected vibration level is corrected by the correction coefficient, the characteristics of the sound output from the sound output means can be made substantially constant even if the detected vibration level varies. it can.

Moreover, from another viewpoint, it has three or more detection means for detecting vibrations at different positions in the hit member, and the measurement means includes two detection means having different combinations among the three or more detection means. A pair of detection means, one of the detection means of each set as the first detection means, and the other as the second detection means, and measuring the time difference for each of the sets, The hitting position is specified according to the plurality of time differences measured by the measuring means and the detection positions where vibrations are detected by the detecting means included in the sets.
Here, the measurement means measures the time difference for each of the groups, with a pair of detection means detecting vibrations continuously in time among the three or more detection means.

  In a preferred aspect, a determining means for determining a gain for amplifying a detection signal detected by the detecting means for detecting vibration of the hit member using the hit position specified by the specifying means; and the determination And amplifying means for amplifying the detection signal with the gain determined by the means, wherein the sound control means outputs sound according to the detection signal amplified by the multiplication means.

  Further, from another point of view, it has three or more detection means for detecting vibrations at different positions of the hit member, and the measurement means is configured to detect each detection means from detection signals of the three or more detection means. The vibration start time points at the positions are detected, and the time difference between these vibration start time points is measured, and the specifying means includes the positional relationship between the detection positions at which vibrations are detected by the three or more detection means, and the measurement means. The area hit by the hit member is identified from the detected vibration start time of each detecting means, and the time difference is associated with position information indicating the hit position where the time difference occurs in the hit member. The position information corresponding to the time difference measured by the measuring means is identified from the table, and the striking position is determined from the identified area and the position information. A constant.

  According to the present invention, it is possible to quickly specify the hitting position from the time of hitting, and it is possible to accurately specify the hitting position even if the output level of the detection signal varies.

<First Embodiment>
Hereinafter, an electronic drum system according to a first embodiment of the present invention will be described with reference to the drawings.
First, an outline of the electronic drum system according to the first embodiment will be described with reference to FIG. As shown in this figure, the electronic drum system 200 includes a circular drum head (hereinafter referred to as a head) 210. The head 210 has one sensor in each of four coordinates (100, 0), (−100, 0), (0, 100) and (0, −100) on the XY plane with the center O as the origin. It is provided one by one. More specifically, the sensor Y1 is provided at the coordinates (0, 100), the sensor Y2 is provided at the coordinates (0, −100), and the sensor X1 is provided at the coordinates (100, 0). The sensor X2 is provided at the coordinates (−100, 0). The distances from these sensors Y1, Y2, X1 and X2 to the center O are equally “100 mm”. The sensors Y1, Y2, X1 and X2 are, for example, piezo elements. When the head 210 is hit by a stick, an electromotive force (hereinafter referred to as a detection signal) corresponding to the vibration of the position of the head 210 where the head 210 is provided. ) Is output. These sensors Y 1, Y 2, X 1 and X 2 are desirably arranged in the vicinity of the outer periphery of the head 210 in order to reduce the influence of a reflected wave or the like by the outer frame of the head 210. The sensors Y1, Y2, X1, and X2 actually have a planar spread on the XY plane, but for convenience of explanation, in this specification, the sensors Y1, Y2, X1, and X2 are the corresponding coordinate points. The description will be made assuming that the vibration of the above is detected.

Next, a mechanism for detecting which position of the head 210 is hit in the electronic drum system 200 will be described. For example, when the point BP shown in FIG. 1 on the head 210 is hit with a stick, the sensors Y1, Y2, X1, and X2 respectively output detection signals OY1, OY2, OX1, and OX2 as shown in FIG. . As shown in this figure, the detection signal OY1 from the sensor Y1 rises earlier than the detection signal OY2 from the sensor Y2 by a time difference ΔT _y . This is because the distance between the sensor Y1 and the hit point BP (hereinafter referred to as the hitting position) is shorter than the distance between the sensor Y2 and the hitting position BP, and the sensor Y1 is earlier than the sensor Y2 by the time difference ΔT _y. This is because vibration from the hitting position BP arrives. Similarly sensor X1 is close to the striking position BP than sensor X2, sensor X1 detects as soon vibration time difference [Delta] T _x than sensor X2. In the electronic drum system 200, the time difference ΔT _y (= t4−t2) between the time point t2 when the start of vibration is detected by the sensor Y1 and the time point t4 when the start of vibration is detected by the sensor Y2 is measured, and the sensor A time difference ΔT _x (= t3−t1) between the time point t1 when the start of vibration is detected by X1 and the time point t3 when the start of vibration is detected by the sensor X2 is measured (blocks B1 and B2 in FIG. 1). Then, after the position of the hitting position BP is specified using these measurement results (block B3), a tone signal representing a tone corresponding to the hitting position BP is generated (block B4).

In the electronic drum system 200, the correction coefficient is calculated using the time differences ΔT _y and ΔT _x and the detection signals OY1, OY2, OX1, and OX2 (block B5). This correction coefficient is a coefficient for correcting variations in the output level between the detection signals OY1, OY2, OX1, and OX2 due to individual differences between the four sensors Y1, Y2, X1, and X2, and the detection signal OY1 is As a reference, it is a coefficient for correcting the other detection signals OY2, OX1, and OX2.

Next, a hardware configuration of the electronic drum system 200 for realizing each function described above will be described.
FIG. 3 is a diagram illustrating a hardware configuration of the electronic drum system 200. In this figure, a central processing unit (CPU) 220 controls the whole via a bus 202 in accordance with various control programs stored in a read only memory (ROM) 230. The CPU 220 includes a timer and can measure rise time differences ΔT _y and ΔT _x between the detection signals OY1, OY2, OX1, and OX2.

  The ROM 230 stores various control programs executed by the CPU 220 and sensor position information. Among these, the control program includes a tone signal generation program and a correction coefficient calculation program. The musical tone signal generation program is a program for generating a musical tone signal corresponding to the striking position BP and the striking strength V after obtaining the striking position BP and the striking strength V when the head 210 is hit. On the other hand, the correction coefficient calculation program is a program for obtaining the above-described correction coefficient. The sensor position information is information indicating coordinates at which the sensors Y1, Y2, X1, and X2 are provided. The CPU 210 can read the sensor position information from the ROM 230 and obtain the positions of the sensors Y1, Y2, X1 and X2.

  The output lines of the four sensors Y1, Y2, X1 and X2 provided in the head 210 are connected to the bus 202 via the A / D converter 250 corresponding to one to one. The detection signals OY1, OY2, OX1, and OX2 from the sensors Y1, Y2, X1, and X2 are analog-digital converted by the corresponding A / D converter 250 and then supplied to the bus 202.

  The flash memory 240 is a rewritable recording medium and stores correction coefficients calculated by the CPU 220. Note that “1” is stored in advance in the flash memory 240 as the initial value of the correction coefficient for the detection signals OY2, OX1, and OX2.

  The output I / F (interface) 260 is an interface for outputting a musical sound signal generated by the CPU 220 to the sound unit 270. The sound unit 270 supplies the tone signal to the sound output unit 280 after applying an effect to the tone signal or amplifying the tone signal. The sound emitting unit 280 is, for example, a speaker, and emits sound according to a musical sound signal supplied from the sound unit 270.

Next, the operation of the electronic drum system 200 will be described. In the following description of the operation, first, the correction coefficient calculation process executed by the CPU 220 according to the correction coefficient calculation program will be described, and then the tone signal generation process executed by the CPU 220 according to the tone signal generation program will be described.
FIG. 4 is a flowchart of the correction coefficient calculation process. This correction coefficient calculation process is triggered when the CPU 220 detects that the detection signal OY1, OY2, OX1, or OX2 from the sensors Y1, Y2, X1, and X2 rises and the head 210 is hit. As a process executed by the CPU 220.

When any of the detection signals OY1, OY2, OX1, and OX2 rises, the CPU 220 measures a time difference ΔT _y between the detection signal OY1 and the detection signal OY2, and measures a time difference ΔT _x between the detection signal OX1 and the detection signal OX2. Then, it is determined whether or not both the time difference ΔT _y and the time difference ΔT _x are “0” (step Sa1). That is, the CPU 220 determines whether or not the hit position BP is equidistant from each of the sensor X1 and the sensor X2 and is equidistant from the sensor Y1 and the sensor Y2 (0, 0). . If the determination result is negative, the CPU 220 ends the process.

  On the other hand, if the determination result in step Sa1 is affirmative, the CPU 220 calculates a correction coefficient (step Sa2). Now, since the striking position BP is located at the coordinates (0, 0) (step Sa1: Yes), the distances from the striking position BP to the sensors Y1, Y2, X1, and X2 are all equal. For this reason, the levels (amplitudes) of the detection signals OY1, OY2, OX1, and OX2 from the sensors Y1, Y2, X1, and X2 should be equal to each other, but actually, the sensors Y1, Y2, X1, and They are not necessarily equal due to individual differences between X2. When variations occur in the levels of the detection signals OY1, OY2, OX1, and OX2, as described above, which of the detection signals OY1, OY2, OX1, and OX2 is used when a musical sound signal is generated using the level of the detection signal. Correspondingly, the characteristics of the tone signal such as the volume vary.

  Therefore, in this step Sa2, the levels of the other detection signals OY2, OX1, and OX2 are corrected with reference to the level of the detection signal OY1 so that the levels of all the detection signals OY1, OY2, OX1, and OX2 are aligned. Find the correction factor. As the correction coefficient, for example, a ratio of the maximum amplitude (absolute value of the maximum value) of the detection signal OY1 and the maximum amplitudes of the other detection signals OY2, OX1, and OX2 can be used.

  More specifically, it is assumed that the maximum amplitudes of the detection signals OY1, OY2, OX1, and OX2 are different as shown in FIG. That is, with reference to the maximum amplitude of the detection signal OY1, the maximum amplitude of the detection signal OY2 is “1.2” times, the maximum amplitude of the detection signal OX1 is “0.8” times, and the maximum amplitude of the detection signal OX2 Is “1.0” times. At this time, in step Sa2, the CPU 220 obtains the maximum amplitude ratio “1.2” as the correction coefficient for the detection signal OY2, and uses the maximum amplitude ratio “0.8” as the correction coefficient for the detection signal OX1. The maximum amplitude ratio “1.0” is obtained as a correction coefficient for the detection signal OX2.

Then, the CPU 220 overwrites and saves the calculation result of the correction coefficient for each of the detection signals OY2, OX1, and OX2 in the flash memory 240 (step Sa3), and ends the process.
The correction coefficients stored in the flash memory 240 in this way are used for correcting the levels of the detection signals OY2, OX1, and OX2 in the musical tone signal generation process described below.

  Next, the tone signal generation process will be described with reference to FIG. This process is a process executed in parallel with the above-described correction coefficient calculation process, and is a process for generating a musical sound signal reflecting the hit position BP and the hit strength V and reflecting them. When the CPU 220 detects the rising edge of any of the detection signals OY1, OY2, OX1, and OX2, the CPU 220 starts a musical sound signal generation process using this as a trigger.

First, when any of the detection signals OY1, OY2, OX1, and OX2 rises, the CPU 220 measures time differences ΔT _y and ΔT _x (step Sb1). Next, the CPU 220 calculates the coordinates (X _BP , Y _BP ) of the hitting position BP using the following formulas 1 and 2 (step Sb2).

Here, the propagation speed of vibration by the striking of head 210 (mm / s) and v, d _y included in Equations 1 and 2 satisfies d _y = v · ΔT _y. On the other hand, d _x satisfies d _x = v · ΔT _x .
The CPU 220 obtains the coordinates (X _BP , Y _BP ) of the hitting position BP by substituting the time difference ΔT _y and the time difference ΔT _x measured in step Sb1 into these expressions 1 and 2.

Hereinafter, how Formula 1 and Formula 2 were derived will be described. Assuming that the hitting position BP shown in FIG. 7 is hit, the distance between the sensor Y1 and the hitting position BP is “k”, the distance between the sensor Y2 and the hitting position BP is “l”, and the sensor X1 And the striking position BP is “m”, and the distance between the sensor X2 and the striking position BP is “n”. At this time, the hit position BP has a circle 202 indicated by a broken line in the drawing whose center is the coordinate (0, 100) and the radius is “k”, and the center is the coordinate (0, −100) and the radius is “ It is located at the intersection with a circle 204 indicated by a broken line in the figure. That is, the coordinates (X _BP , Y _BP ) of the hitting position BP correspond to coordinates that satisfy the following two expressions.

On the other hand, the striking position BP has a circle 206 indicated by a broken line in the drawing whose center is the coordinate (100,0) and the radius is “m”, and the center is the coordinate (−100,0) and the radius “n” Is located at the intersection with a circle 208 indicated by a broken line in the figure. That is, the coordinates (X _BP , Y _BP ) of the hitting position BP correspond to coordinates that satisfy the following two expressions.

  Further, the difference between the distance “k” from the impact position BP to the sensor Y1 and the distance “l” from the impact position BP to the sensor Y2 is expressed by the following equation using the propagation velocity v.

  Similarly, the difference between the distance “m” from the striking position BP to the sensor X1 and the distance “n” from the striking position BP to the sensor X2 is expressed by the following equation using the propagation velocity v.

  When the above formulas 3 to 8 are converted, the following two formulas are obtained.

  Then, solving these equations 9 and 10, the above-described equations 1 and 2 are obtained. However, only in Expression 1 and Expression 2, there are positive and negative binary values for the X and Y coordinates of the striking position BP. For this reason, the CPU 220 further selects the positive and negative of the X coordinate and the Y coordinate of the hitting position BP under the following conditions. That is, if the sensor Y1 detects vibration earlier than the sensor Y2, the CPU 220 selects the positive side as the sign of the Y coordinate of the hitting position BP, and conversely, if the sensor Y2 detects vibration earlier than the sensor Y1. For example, the negative side is selected as the sign of the Y coordinate of the striking position BP. On the other hand, if the sensor X1 detects vibration earlier than the sensor X2, the CPU 220 selects the positive side as the sign of the X coordinate of the hitting position BP, and conversely, if the sensor X2 detects vibration earlier than the sensor X1. If so, the negative side is selected as the sign of the X coordinate of the striking position BP.

The description returns to FIG. 6 again. When the striking position BP is calculated in step Sb2, the CPU 220 selects a sensor closest to the striking position BP among the four sensors Y1, Y2, X1, and X2 (step Sb3). As a selection method, in addition to the method of selecting the sensors Y1, Y2, X1, and X2 corresponding to the detection signal having the earliest rise among the detection signals OY1, OY2, OX1, and OX2, the hit position BP specified in step Sb2 is selected. A method may be considered in which the coordinates (X _BP , Y _BP ) are used to determine the distance between the hitting position BP and each of the sensors Y1, Y2, X1, and X2 and then select them. In this embodiment, the CPU 220 selects the sensor closest to the hitting point BP by the former selection method. More specifically, if the detection signals rise in the order of OX1, OY1, OX2, and OY2, as shown in FIG. 2, the CPU 220 selects the sensor X1 as the sensor closest to the striking position BP. In the following, the detection signal OX1 from the selected sensor X1 is used for calculating the impact strength V.

  Next, the CPU 220 corrects the selected detection signal OX1 as follows using the correction coefficient stored in the flash memory 240 (step Sb4). Now, it is assumed that the correction coefficient calculated by the correction coefficient calculation process described above is stored in the flash memory 240 as a correction coefficient. That is, “0.8” is stored as the correction coefficient of the detection signal OX1. At this time, the CPU 220 corrects the level of the detection signal OX1 by dividing the detection signal OX1 by “0.8”. As a result, the level of the detection signal OX1 is corrected so as to approach the level of the detection signal OY1 serving as a reference, and the level variation that occurs between the detection signals OY1, OY2, OX1, and OX2 can be suppressed.

Next, the CPU 220 obtains a distance between the coordinates (X _BP , Y _BP ) of the hitting position BP and the sensor selected in step Sb3 (sensor X1 in this example). Now, the distance D from the origin (0, 0) to the striking position BP is expressed by the following equation using Equation 1 and Equation 2.

  Using this distance D, the distances “k”, “l”, “m” and “n” between the hitting position BP and each of the sensors Y1, Y2, X1 and X2 can be expressed as follows.

  Of these, the CPU 220 obtains the distance “l” between the hitting position BP and the sensor X1 using Expression 13. Subsequently, the CPU 220 calculates the impact strength V using the distance “l” according to the following equation (step Sb6).

  Here, A is the maximum amplitude (absolute value of the maximum value) of the detection signal (detection signal OX1 in this example) corrected in step Sb4. On the other hand, G is a parameter obtained experimentally. The calculation method of the impact strength V is not limited to the method using Expression 16, and the sum of the maximum amplitudes for all the detection signals OY1, OY2, OX1, and OX2 is obtained, and the respective sensors Y1, Y2 are calculated. , X1 and X2 can also be obtained according to the distance D from the geometric center (in this example, the center O of the head 210) to the striking position BP (see Expression 11).

  Next, the CPU 220 generates a tone signal imitating the tone of the acoustic drum according to the hitting position BP determined in step Sb2 and the hitting strength V determined in step Sb6, and the sound is output via the output I / F 260. It outputs to the unit 270 (step Sb7). When receiving the tone signal, the sound unit 270 adds an effect to the tone signal and amplifies the tone signal so that it can be output from the sound emitting unit 280 and then emits the sound through the sound emitting unit 280.

As described above, in the present embodiment, the hit positions BP are detected using the time differences ΔT _y and ΔT _x at the time of detection of vibrations generated between the sensors Y1, Y2, X1, and X2. Has the following advantages. First, in the prior art 1, since the calculation related to the striking position BP cannot be started until the detection signal reaches the maximum value as described above, it takes time to output the musical sound. On the other hand, according to the present embodiment, the calculation process of the hitting position BP can be started when all the detection signals OY1, OY2, OX1, and OX2 rise. For this reason, there is almost no waiting time from the start of any of the detection signals OY1, OY2, OX1, and OX2 until the start of the calculation related to the striking position BP, and the period from when the user strikes until the musical sound is output. It can be shortened.

  In the prior art 1, the maximum value of the detection signal (hereinafter referred to as the first maximum value) and the maximum value of one polarity (hereinafter referred to as the second maximum value) within a predetermined period from the rise of the detection signal. After the detection, a table in which the first maximum value and the hitting position are associated (hereinafter referred to as the first table), and a table in which the second maximum value and the hitting position are associated (hereinafter referred to as the second table). The hitting position had to be specified based on More specifically, in these first and second tables, the corresponding maximum value and the hitting position are associated with each hitting strength V set in stages. When the hit position is specified, the hit position corresponding to the first maximum value is extracted from the first table by the number of hit strengths V, while the hit position corresponding to the second maximum value is extracted from the first table. The number is extracted from the second table. Further, the hitting position is specified by comparing the plurality of hitting positions extracted from the first table with the plurality of hitting positions extracted from the second table. As described above, in the prior art 1, when specifying the hitting position, it is necessary to specify a plurality of hitting positions extracted from the two tables while collating them by trial and error, and thus the processing is complicated. On the other hand, according to the present embodiment, the striking position BP can be obtained directly by the calculation of the formula without performing trial and error collation of the striking position, and therefore, the process related to the identification of the striking position BP. Becomes simple.

In the prior art 2, the hitting position BP is detected according to the level of the detection signal. For this reason, as described above, there is a possibility that a detection error may occur at the hitting position BP due to the variation in the level between the detection signals from the plurality of sensors. On the other hand, according to the present embodiment, not the level of the detection signals OY1, OY2, OX1 and OX2, but the time difference ΔT _y and ΔT _x at the time of detection of vibration between the sensors Y1, Y2, X1 and X2 The position BP is calculated. In general, there may be a deviation in the level of the detection signal between a plurality of sensors, but there is almost no deviation in the detection timing. Therefore, according to the present embodiment, the hitting position BP can be detected more accurately.

  Further, the detection signals OY1, OY2, OX1, and OX2 used in the musical tone signal generation process are used for generating musical tone signals after being corrected by a correction coefficient. For this reason, regardless of which of the detection signals OY1, OY2, OX1, and OX2 is used to calculate the impact strength V, the levels can be made substantially the same. Thereby, in particular, in a configuration in which a musical tone signal is generated based on detection signals from a plurality of sensors, it is possible to reduce variations in characteristics of the musical tone signal.

Second Embodiment
In the first embodiment described above, the electronic drum system 200 that specifies the striking position BP using a mathematical expression having the time differences ΔT _y and ΔT _x as variables has been described. On the other hand, the electronic drum system in the second embodiment specifies the striking position BP using a striking position table in which the striking position BP is associated with two types of time differences. Note that, in the electronic drum system according to the second embodiment, a configuration common to the electronic drum system 200 in the first embodiment will be described using the same reference numerals.

FIG. 8 is a diagram illustrating a functional configuration of the electronic drum system 300 according to the second embodiment, along with the configuration around the head 210. In the electronic drum system 300 shown in this figure, two sets of detection signals are extracted in the order in which vibrations are detected among the detection signals OY1, OY2, OX1, and OX2 from the sensors Y1, Y2, X1, and X2, and each detection is performed. The time differences ΔT1 and ΔT2 in the signal set are measured (block B11). More specifically, if each detection signal rises in the order of OY1, OX1, OY2, and OX2, as shown in FIG. 9, the rising time t5 of the detection signal OY1 that firstly detected the vibration and the second vibration. The time difference ΔT1 (t6−t5) between the detection signal OX1 that detects the vibration and the rising time t6, the rising time t6 of the detection signal OX1 that detects the second vibration, and the third detection signal OY2 that detects the vibration A time difference ΔT2 (t7−t6) from the rise time t7 of is measured. Then, after specifying the striking position BP using the two time differences ΔT1 and ΔT2 from the striking position table (block B12), a musical sound signal is generated (block B13).
In the present embodiment, the time difference ΔT2 is the rise time t6 of the detection signal OX1 that detects the second vibration shown in FIG. 9 and the rise time t7 of the detection signal OY2 that detects the third vibration. Although the time difference is used, a time difference (t8−t7) between the rising time t7 of the detection signal OY2 that detects the third vibration and the rising time t8 of the detection signal OX2 that detects the fourth vibration may be used. .

  The hardware configuration of the electronic drum system 300 is the same as that of the electronic drum system 200 described above except that the striking position table is stored in the ROM 230. FIG. 10 is a diagram illustrating a part of the striking position table stored in the ROM 230. More specifically, the ROM 230 detects the relative positions of the first sensor that detects vibration and the second sensor that detects vibration, the second sensor that detects vibration, and the third vibration. As many hitting position tables as the number of all combinations with the relative positions of the sensors are stored. FIG. 10 shows one hitting position table. As shown in this figure, the hitting position table TBL includes sections “−10t ≦ ΔT1 <−9t (where t> 0)”, “−9t ≦ ΔT1 <−8t”,. .Ltoreq..DELTA.T1 <9t "," 9t.ltoreq..DELTA.T1 <10t "and time difference .DELTA.T2" -10t.ltoreq..DELTA.T2 <-9t "," -9t.ltoreq..DELTA.T2 <-8t ",...," 8t.ltoreq..DELTA.T2 <9t " For each combination of “9t ≦ ΔT2 <10t”, area information “A1”, “A2”, “B1”, “B2”, “C1” indicating which part of the head 210 the hitting position BP is. , “C2”, “D1”, “D2”...

  Next, the operation of the electronic drum system 300 according to the second embodiment will be described. The electronic drum system 300 executes substantially the same processing as the electronic drum system 200 described above, but in step Sb2 included in the musical tone signal generation processing shown in FIG. "Positioning process" is executed.

FIG. 11 is a flowchart of the striking position specifying process executed by the CPU 220 in the second embodiment.
First, the CPU 220 specifies the relative position between the sensor where the detection signal rises first and the sensor where the detection signal rises second, and measures the time difference ΔT1 between the detection signals at the rise time. (Step Sc1).

  Next, the CPU 220 specifies the relative position between the sensor where the second detection signal rises and the sensor where the third detection signal rises, and measures the time difference ΔT2 between the detection signals at the rise time. (Step Sc2).

  Subsequently, the CPU 220 detects the relative position of the sensor where the detection signal rises first and the sensor where the detection signal rises second, the sensor where the detection signal rises second, and the detection signal third. From the relative positions of the sensors that have risen, the striking position table TBL corresponding to two relative positions is selected from the plurality of striking position tables TBL stored in the flash memory 240. (Step Sc3).

  Next, the CPU 220 retrieves area information corresponding to the time difference ΔT1 and the time difference ΔT2 from the batting position table TBL selected in step Sc3, and specifies the retrieved area information as the batting position BP (step Sc4). Thus, in 2nd Embodiment, since area | region information is searched from the impact position table TBL, and the impact position BP is specified, the impact position BP can be obtained without performing the calculation process using a numerical formula. In the second embodiment, the striking position BP is specified using three detection signals that rise quickly among the four detection signals OY1, OY2, OX1, and OX2. For this reason, since the calculation of the striking position BP can be started without waiting for the rise of all the detection signals OY1, OY2, OX1, and OX2, the time for generating a musical sound signal can be shortened.

<Third Embodiment>
In the first embodiment described above, in the musical tone signal generation process, the hitting strength V is determined by calculation using a function (see Equation 16) having the hitting position BP and the distance l between the sensors as variables (see Equation 16) (step of FIG. Sb6). On the other hand, in the electronic drum system according to the third embodiment, the gain associated with the striking position BP is identified from the table with reference to the gain table in which the striking position BP is associated with the gain. The impact strength V is determined based on the gain obtained.

  The electronic drum system according to the present embodiment (hereinafter referred to as “electronic drum system 500”) has the same hardware configuration as the electronic drum system 200 (first embodiment) shown in FIG. It differs from the electronic drum system 200 in that the table is recorded. The gain table is a table for specifying a gain for amplifying the detection signal in accordance with the hitting position BP calculated in step Sb2 in FIG.

  In the gain table, the gain is associated with each of the areas in which the head 210 is divided into a plurality of areas on a one-to-one basis. More specifically, as shown in FIG. 13, in this embodiment, the head 210 is divided into four regions, region A, region B, region C, and region D, and each region is associated one-to-one. The gain obtained is managed by a gain table.

  In the head 210, an area A is an area closest to the sensor Y1 among the four sensors Y1, Y2, X1 and X2, and when hit, the sensor Y1 detects vibrations earliest. The region B is the region closest to the sensor X1, and vibration is detected earliest by the sensor X1 when hit. Similarly, a region C is a region where vibration is detected earliest by the sensor Y2 when hit, and a region D is a region where vibration is detected earliest by the sensor Y2 when hit.

  Therefore, in the musical tone signal generation process, when the region A is hit, the detection signal OY1 by the sensor Y1 that detects the vibration earliest is used for the generation of the musical tone signal. When the region B is hit, a detection signal OX1 by the sensor X1 that detects the vibration earliest is used for generating a musical sound signal. Similarly, when the area C is hit, the detection signal OY2 from the sensor Y2 is used for generating a musical sound signal, and when the area D is hit, the detection signal OX2 from the sensor X2 is used to generate a musical sound signal. Used.

FIG. 14 shows the contents of the gain table. As shown in this figure, gain table is a region A of the head 210, B, and C and D, the gain _{G A,} G B, and a _{G C} and _{G D} associated table. Specifically, in the gain table, in the area A, the gain G _A are associated for amplifying a detection signal OY1, in the region B, correlated gain G _B for amplifying the detection signal OX1 It has been. Also, the region C, the gain G _C are associated to amplify a detection signal OY2, in the region D, the gain G _D for amplifying the detection signal OX2 are associated. These gains _{G A, G B, G C} and _{G D} is experimentally determined in advance. In the electronic drum system 500, the gain associated with the region to which the hitting position BP belongs is specified using the gain table, and the sound is emitted according to the detection signals OY1, OY2, OX1, and OX2 amplified by the specified gain. . This operation is specifically described as follows.

The CPU 210 of the electronic drum system 500 outputs a musical sound corresponding to the hit by a process similar to the musical tone signal generation process (see FIG. 6) described in the first embodiment. In step Sb6 of FIG. Execute specific processing.
FIG. 15 is a flowchart of the impact strength specifying process. In this figure, first, the CPU 210 of the electronic drum system 500 specifies which of the areas A, B, C, and D the striking position BP calculated in step Sb2 of FIG. 6 belongs to (step Sd1). ). Next, the CPU 320 refers to the gain table shown in FIG. 14 and determines a gain associated with the identified area (step Sd2). For example, if the striking area in step Sd1 is identified as the "B", CPU 210 refers to the gain table to determine the gain and "G _B".

Next, the CPU 210 amplifies the detection signal that has detected the earliest vibration with the determined gain. Now, if the region B is hit, the detection signal OX1 by sensor X1 detects the earliest vibration, CPU 210 amplifies the detection signal OX on the detection signal OX1 by the gain _{"G B".}

As described above, the hitting position specifying process has the following advantages because the detection signal is amplified by the gain obtained from the gain table without using the function having the distance l as a variable. That is, in general, in the electronic drum system, the detection characteristics of the sensor vary depending on the head and its peripheral structure, the sensor mounting position, and the like. There are cases where the musical sound that will be output cannot be reproduced precisely. Therefore, in the present embodiment, a configuration is employed in which gains are experimentally obtained in advance for each of the regions A, B, C, and D, and a tone signal is generated using gains specified from a gain table that manages these gains. Yes. As a result, it is possible to specify an appropriate gain regardless of the structure of the head, and it is possible to generate a suitable tone signal. In addition, the calculation amount in the CPU 210 can be reduced by generating a musical sound signal by using the gain obtained from the gain table instead of the calculation using the function.
In the present embodiment, there are four areas (areas A, B, C, and D) managed by the gain table. However, the number of areas managed in the gain table can be changed as appropriate. is there.

<Fourth embodiment>
The electronic drum system according to the fourth embodiment specifies the striking position from the order in which each sensor detects vibration and the time difference at which each sensor detects vibration. Note that, in the electronic drum system according to the fourth embodiment, configurations common to the electronic drum system 200 in the first embodiment will be described using the same reference numerals.

The functional configuration of the electronic drum system 600 according to the fourth embodiment is the same as that of the electronic drum system according to the first embodiment. Electronic Drum System 600, the detection signal OY1, OY2, OX1 and if any of OX2 rises, with measures the time difference [Delta] T _y in the detection signal OY2 Prefecture and the detection signal OY1, the time difference [Delta] T in the detected signal OX2 Prefecture and the detection signal OX1 Measure _x . Then, the time difference ΔT _x and the time difference ΔT _y are compared, and the larger time difference is defined as the time difference ΔT1, and the smaller time difference is defined as the time difference ΔT2.

  FIG. 16 is a diagram illustrating a hardware configuration of an electronic drum system 600 according to the fourth embodiment. The hardware configuration of the electronic drum system 600 according to the present embodiment is different from that in which the hitting area table is stored in the flash memory 240 and the flow of processing performed by the CPU 220 that starts the musical tone signal generation program is different. This is the same as the electronic drum system 200 described above.

  FIG. 17 is a diagram illustrating a format of the hitting area table. As shown in FIG. 17, the striking area table includes sections of time difference ΔT1 “0t ≦ ΔT1 <1t (where t> 0)”, “1t ≦ ΔT1 <2t”,..., “8t ≦ ΔT1 <9t , “9t ≦ ΔT1 <10t” and time difference ΔT2 classification “0t ≦ ΔT2 <1t”, “1t ≦ ΔT2 <2t”,..., “8t ≦ ΔT2 <9t”, “9t ≦ ΔT2 <10t” Is associated with any one of the area information “A1 to I10” indicating the position area in the fan shape obtained by dividing the head 210 into eight equal parts at a central angle of 45 degrees.

  Next, the operation of the electronic drum system 600 according to the fourth embodiment will be described. Since the electronic drum system 600 performs substantially the same processing as the electronic drum system 200 described above, the description of the same processing as the electronic drum system 200 is omitted. In the electronic drum system 600, instead of “calculation of hitting position” performed in step Sb2 of the musical tone signal generation process shown in FIG. 6, “hitting area specifying process” is performed (see FIG. 18).

When any of the detection signals OY1, OY2, OX1, or OX2 rises, the CPU 220 measures the time difference ΔT _y between the detection signal OY1 and the detection signal OY2, and measures the time difference ΔT _x between the detection signal OX1 and the detection signal OX2. To do.

  Then, the CPU 220 identifies which area is hit among the areas of the head 210 shown in FIG. 19 based on the order in which each detection signal rises (FIG. 18: Step Se1). For example, if the CPU 220 first detects the detection signal OY1 output from the sensor Y1 and then detects the detection signal OX1 output from the sensor X1, the CPU 220 is assumed to have been hit within the area AR1 shown in FIG. When the detection signal OX1 output from the sensor X1 is detected first and then the detection signal OY1 output from the sensor Y1 is detected, it is determined that the area AR2 shown in FIG. 19 has been hit. . Thus, the CPU 220 identifies the sensor that first output the detection signal and the sensor that has output the second detection signal, and determines the area hit by the head 210 based on the positional relationship between the two specified sensors. Identify. In addition, when a ranking is assigned to each sensor and the detection signals from the two sensors are detected at the same time when hit, either one of the detection signals is detected first according to the ranking given to the sensors. You may make it decide. According to such an aspect, for example, it is possible to perform processing even when a singular point where vibration is transmitted to the X direction sensor and the Y direction sensor simultaneously is hit.

Next, the CPU 220 compares the time difference ΔT _x with the time difference ΔT _y, and sets the time difference having the larger time difference as the time difference ΔT1 (step Se2) and the time difference having the smaller time difference as the time difference ΔT2 (step Se3). For example, as shown in FIG. 19, when a position BP1 close to the sensor Y1 is hit, ΔT _y > ΔT _x is _satisfied , and thus ΔT1 = ΔT _y and ΔT2 = ΔT _x . When the time difference ΔT _x and the time difference ΔT _y are the same, the CPU 220 sets ΔT1 = ΔT _y and ΔT2 = ΔT _x , for example.

Next, the CPU 220 specifies region information corresponding to the time difference ΔT1 and the time difference ΔT2 from the striking region table (step Se4). For example, the position BP2 striking shown in FIG. 19, in the range of the time difference [Delta] T _y is 0 ≦ T1 <1t, when the time difference [Delta] T _x is in the range of 0 ≦ T2 <1t, exemplified blow 17 In the area table, “A1” is specified as area information for specifying the hitting position. Then, the CPU 220 specifies the striking position from the area specified in step Se1 and the area information specified in step Se4 (step Se5). Thus, in the fourth embodiment, since the hit area is specified based on the order in which each detection signal rises, the area information is specified from the hit area table, and the hit position is specified. The hitting position can be obtained without performing arithmetic processing using mathematical expressions.

<Modification>
The present invention is not limited to the first and second embodiments described above, and various modifications and improvements can be added to each embodiment.
For example, in the first and second embodiments described above, the hitting position BP is specified using the four sensors Y1, Y2, X1, and X2, but the number of sensors is not limited to four, and the head 210 is different. The hit position BP can be specified by using two or more sensors that detect the vibration of the location. For example, if the sign of the time difference ΔT _x for the two sensors X1 and X2 is obtained, the sign of the X coordinate of the striking position BP can be specified. Thereby, it is possible to specify whether the hit position BP is on the right side (X coordinate “positive”) or the left side (X coordinate “negative”) with the Y axis as a boundary in the head 210. In the above embodiment, the circular head 210 has been described. However, if the head is a rod-shaped head and the side surface extending in the longitudinal direction is hit, it is based on the detection time difference between the two sensors. Thus, the striking position BP can be specified as follows. That is, one sensor is provided at each end in the longitudinal direction of the head, and the striking position BP based on one-dimensional coordinates can be specified from the time difference between the two sensors.

  FIG. 12 is a diagram showing a schematic configuration of an electronic drum system 400 that detects the striking position BP using three sensors. As shown in this figure, in the electronic drum system 400, three sensors 401, 402, and 403 are provided at different locations in the head 210, respectively. In the electronic drum system 400, among the detection signals from the sensors 401, 402, and 403, the time difference ΔT1 between the detection signal that rises first and the detection signal that rises second, the detection signal that rises second, and The time difference ΔT2 of the detection signal that rises third is measured (block B21). These time difference ΔT1 and time difference ΔT2, the relative position of the sensor where the first detection signal rises and the sensor where the second detection signal rises, the second detection signal rises and the third The striking position BP is specified using the relative position of the sensor on which the detection signal rises the second time (block B22), and a musical sound signal is generated (block B23). As a method for specifying the hitting position BP, as in the first embodiment, the coordinates of the hitting position BP may be obtained directly by calculation using mathematical formulas, or prepared in advance as in the second embodiment. The hitting position BP may be specified by using the hitting position table TBL. Similarly to the fourth embodiment, the hit area may be specified based on the order in which each detection signal rises, and the hit position may be specified by specifying the area information using the hit area table.

In the correction coefficient calculation process described above, the correction coefficient is calculated only when the rising timings of all the detection signals OY1, OY2, OX1, and OX2 are equal and the hitting position BP is the origin (0, 0). However, the conditions relating to the calculation of the correction coefficient are not limited to this. For example, any one of the detection signals OY1 and OY2 from the sensors Y1 and Y2 arranged in the Y direction on the condition that the time difference ΔT _x satisfies “0”, that is, on the condition that the hitting position BP is located on the X axis. It is also possible to calculate a correction coefficient related to the other detection signal on the basis of one of them.

Furthermore, even when the time difference ΔT _y is not “0” and the hitting position BP is not located at the center between the sensor Y1 and the sensor Y2, the correction coefficient can be calculated as follows. Now, focusing only on the Y coordinate for the striking position BP, a predetermined time difference ΔT _y and a level characteristic (for example, maximum amplitude) of the detection signal OY1 or OY2 corresponding thereto are experimentally obtained in advance. Then, when the time difference ΔT _y takes a predetermined value, the correction coefficient may be calculated by comparing the characteristic of the detection signal OY1 or OY2 obtained in advance with the characteristic of the detection signal OY1 or OY2 actually detected. . According to such a configuration, the correction coefficient can be calculated regardless of the position of the hitting position BP.

  In the first embodiment, the correction coefficients for the other detection signals OY2, OX1, and OX2 are calculated based on one detection signal OY1 among the four detection signals OY1, OY2, OX1, and OX2. The correction coefficients for all detection signals may be calculated with reference to a level prepared in advance regardless of the detection signals. In short, according to the distance between the detection position detected by the sensor and the hitting position BP and the reference level, each detection signal level (for example, the absolute value of the extreme value) is substantially equal. Any configuration may be used as long as the correction coefficient for correcting the signal is calculated.

  In the hitting area table of the fourth embodiment, “0t ≦ ΔT1 (ΔT2) <1t”, “1t ≦ ΔT1 (ΔT2) <2t”,..., “8t ≦ ΔT1 (ΔT2) <9t”, “ 9t ≦ ΔT1 (ΔT2) <10t ”, the time difference ranges are the same in each section. For example,“ 0t ≦ ΔT1 (ΔT2) <3t ”,“ 3t ≦ ΔT1 (ΔT2) <4t ”. ,..., “9t ≦ ΔT1 (ΔT2) <9.5t”, “9.5t ≦ ΔT1 (ΔT2) <10t”, and the range of the time difference may be made different depending on the division. For example, the time difference ΔT1 is classified as “0t ≦ ΔT1 <1t”, “1t ≦ ΔT1 <2t”,..., “8t ≦ ΔT1 <9t”, “9t ≦ ΔT1 <10t”. Regarding ΔT2, the time difference ΔT1 and the time difference ΔT2 are expressed as “0t ≦ ΔT2 <3t”, “3t ≦ ΔT2 <4t”,..., “9t ≦ ΔT2 <9.5t”, “9.5t ≦ ΔT2 <10t”. The time difference ranges may be different.

1 is a diagram illustrating a schematic configuration of an electronic drum system according to a first embodiment of the present invention. It is a figure which shows the detection signal from the sensor in the electronic drum system. It is a figure which shows the hardware constitutions of the electronic drum system. It is a flowchart of the correction coefficient calculation process performed in the electronic drum system. It is a figure which shows the detection signal from the sensor in the electronic drum system. It is a flowchart of a musical tone signal generation process executed in the electronic drum system. It is a figure for demonstrating the same tone signal generation process. It is a figure which shows schematic structure of the electronic drum system concerning 2nd Embodiment of this invention. It is a figure which shows the detection signal from the sensor in the electronic drum system. It is a figure which shows the striking position table memorize | stored in ROM contained in the same electronic drum system. It is a flowchart of the hit | damage position specific process performed in the same electronic drum system. It is a figure which shows schematic structure of the electronic drum system concerning the modification of this invention. It is a figure for demonstrating the concept of the gain table which concerns on 3rd Embodiment of this invention. It is a figure which shows the gain table recorded on ROM contained in the electronic drum system. It is a flowchart of the hit | damage intensity | strength specific process performed in the same electronic drum system. It is a figure which shows the hardware constitutions of the electronic drum system concerning 4th Embodiment of this invention. It is a figure which shows the hit | damage area | region table which the flash memory with which the same electronic drum system comprises is memorize | stored. It is a flowchart of the hit | damage position specific process performed in the same electronic drum system. It is a figure for demonstrating the same impact position specific process.

Explanation of symbols

200, 300, 400, 500, 600 ... electronic drum system, 210 ... drum head, 220 ... CPU, 230 ... ROM, 240 ... flash memory, 270 ... sound unit, 280 ... sound emission unit, Y1, Y2, X1, X2 ... Sensor, BP ... Stroke position, TBL ... Stroke position table

Claims (9)

First and second detection means for detecting vibrations at different positions of the hit member that vibrates due to impact;
Measuring means for detecting a vibration start time at each position from detection signals of the first and second detection means and measuring a time difference between these vibration start times;
Depending on the time difference measured by the measurement means, the detection position where the vibration is detected by the first detection means, and the detection position where the vibration is detected by the second detection means, in the hit member A hitting position specifying device comprising: specifying means for specifying a hitting position. The specifying means includes a time difference measured by the measurement means, coordinates of a detection position where vibration is detected by the first detection means, and coordinates of a detection position where vibration is detected by the second detection means. The hitting position specifying device according to claim 1, wherein the hitting position is specified by a calculation using. The specifying means includes a positional relationship between a detection position where vibration is detected by the first detection means and a detection position where vibration is detected by the second detection means, the time difference, and the hit member. The position information corresponding to the time difference measured by the measuring means and the positional relationship is searched from a table associated with position information indicating the hit position, and the hit position is specified. The striking position specifying device according to claim 1. First and second detection means for detecting vibrations at different positions of the hit member that vibrates due to impact;
Measuring means for detecting a vibration start time at each position from detection signals of the first and second detection means and measuring a time difference between these vibration start times;
Depending on the time difference measured by the measurement means, the detection position where the vibration is detected by the first detection means, and the detection position where the vibration is detected by the second detection means, in the hit member A specifying means for specifying the hitting position,
An electronic percussion instrument comprising: sound control means for causing a sound output device to output a sound corresponding to the hitting position specified by the specifying means. A correction coefficient for correcting the vibration level detected by the detection means for detecting the vibration of the hit member, and the vibration level detected by the detection means is determined from the detection position where the vibration is detected. A calculation means for calculating a correction coefficient for correcting to a level according to a distance to the hitting position and a reference value of a vibration level;
Correction means for correcting the level of vibration detected by the detection means using a correction coefficient calculated by the calculation means;
The electronic percussion instrument according to claim 4, wherein the sound control unit outputs a sound corresponding to the vibration level corrected by the correction unit. Having three or more detection means for detecting vibrations at different positions of the hit member;
The measurement means is a pair of two detection means having different combinations among the three or more detection means, one of the detection means of each set being the first detection means, and the other being the second detection means. As the detection means, measure the time difference for each set,
The specifying means specifies the striking position according to a plurality of the time differences measured by the measuring means and detection positions at which vibrations are detected by the detecting means included in each set. The electronic percussion instrument according to claim 4 or 5. 7. The measuring unit according to claim 6, wherein the measuring unit measures the time difference for each of the groups, with a pair of the detecting units detecting vibrations continuously in time among the three or more detecting units. The electronic percussion instrument described. A determining means for determining a gain for amplifying the detection signal detected by the detecting means for detecting the vibration of the hit member using the hit position specified by the specifying means;
Amplifying means for amplifying the detection signal with the gain determined by the determining means,
The electronic percussion instrument according to any one of claims 4 to 7, wherein the sound control means outputs a sound in accordance with the detection signal amplified by the multiplication means. Having three or more detection means for detecting vibrations at different positions of the hit member;
The measuring means detects the vibration start time at the position of each detection means from the detection signals of the three or more detection means, and measures the time difference between these vibration start times,
The specifying means is struck by the hit member from the positional relationship of detection positions where vibration is detected by each of the three or more detection means and the vibration start time of each detection means detected by the measurement means. An area is specified, and the position information corresponding to the time difference measured by the measuring unit is specified from a table in which the time difference and position information indicating the hit position where the time difference occurs in the hit member are associated. The electronic percussion instrument according to claim 4 or 5, wherein the hitting position is specified from the specified area and the position information.

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