Electronic percussion instrument and percussion detection method

Abstract

This invention provides an electronic percussion instrument and a method for detecting the impact, which improves the accuracy of impact position detection. Multiple drumhead sensors (4) are arranged on a frame (3) facing the lower surface of the drumhead (6). In a region where the distance from the center of the striking surface (60a) of the drumhead (6) is more than 50% and less than 75% of the radius (R) of the striking surface (60a), the buffers (41) of the multiple drumhead sensors (4) contact the lower surface of the drumhead (6) (diaphragm 60). This makes the sensitivity distribution of the impact on the striking surface (60a) of the drumhead (6) more uniform and suppresses vibrations caused by the drumhead sensors (4) mistakenly detecting that the drum edge (7) has been struck. Therefore, the accuracy of impact position detection is improved.

Description

Technical Field

[0001] This invention relates to an electronic percussion instrument, and more particularly to an electronic percussion instrument that can improve the detection accuracy of the striking position, as well as a striking detection method. Background Technology

[0002] An electronic percussion instrument is known to use a drumhead sensor and a drum rim sensor to detect vibrations when the drumhead or drum rim has been struck, and to determine the striking position based on the detection results. For example, Patent Document 1 describes a technique that compares the output value of the drumhead sensor 133 with the output value of the drum rim sensor 122 to determine which of the drumhead 101 or the drum rim (first striking part 107) has been struck.

[0003] [Existing technical documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-189809 (e.g., paragraphs 0047, 0048, 0056 to 0060, Figure 2 ) Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] However, in the aforementioned prior art, multiple drumhead sensors contact the back of the outer periphery of the drumhead (near the drum edge), making it easy for the drumhead sensors to falsely detect vibrations when the drum edge has been struck. Therefore, there is a problem of reduced accuracy in detecting the strike location.

[0008] This invention was developed to address the aforementioned problems, and its purpose is to provide an electronic percussion instrument and a method for detecting the impact position that can improve the accuracy of the impact position detection.

[0009] [Technical means to solve the problem]

[0010] To achieve the aforementioned objective, the electronic percussion instrument of the present invention includes: a drumhead, the upper surface of which is configured as a striking surface; a cylindrical main body, the opening at the upper end of which is covered by the drumhead; and a plurality of drumhead sensors disposed on the inner circumference of the main body to detect impacts on the striking surface; wherein the plurality of drumhead sensors contact the lower surface of the drumhead in an area at a distance of 50% to 75% of the radius of the striking surface from the center of the striking surface.

[0011] The impact detection method of the present invention is a method for detecting impacts in an electronic percussion instrument. The electronic percussion instrument includes: a drumhead, the upper surface of which is formed as a striking surface; a cylindrical main body, the opening at the upper end of which is covered by the drumhead; a frame, fixed to the inner periphery of the main body and facing the lower surface of the drumhead; a drum edge sensor, supported on the frame, for detecting impacts on the edge of the main body; and a plurality of drumhead sensors, supported on the frame and in contact with the lower surface of the drumhead, for detecting impacts on the striking surface. The impact detection method includes a first determination step of identifying a first playing technique in which only the edge of the main body is struck, and a second playing technique in which both the striking surface and the edge of the main body are struck. The drum edge sensor is disposed on the central side of the frame, and the plurality of drumhead sensors are disposed closer to the outer edge of the frame than the drum edge sensor. The first determination step compares the ratio or difference between the output value of the drum edge sensor and the output value of the drumhead sensor with a first threshold to identify the first playing technique and the second playing technique. Attached Figure Description

[0012] Figure 1 This is an exploded perspective view of the electronic drum in one embodiment.

[0013] Figure 2 This is a cross-sectional view of an electronic drum.

[0014] Figure 3 yes Figure 2 A top view of the electronic drum as seen in the direction of arrow III.

[0015] Figure 4(a) is a scatter plot showing the results of the impact test of the electronic drum of the comparative example, and Figure 4(b) is a scatter plot showing the results of the impact test of the electronic drum of this embodiment.

[0016] Figure 5 It is a schematic diagram illustrating the functional block diagram of the electronic drum and control device.

[0017] Figure 6 This is a flowchart representing the process of determining the playing method.

[0018] [Explanation of Symbols]

[0019] 1: Electronic drums (electronic percussion instruments)

[0020] 2: Tympanic cavity (main body)

[0021] 3: Framework

[0022] 32: First fixing part (fixing part)

[0023] 34: Ribs

[0024] 4: Drumhead Sensor

[0025] 5: Drum edge sensor

[0026] 50: Double-sided adhesive tape (elastic component)

[0027] 6: Drumhead

[0028] 60a: Strike surface

[0029] 7: Drum edge (edge ​​of the main body)

[0030] 101: Impact Detection Unit (Second Detection Component)

[0031] 102: Playing Technique Judgment Section (First Judgment Component)

[0032] 103: Impact Force Calculation Unit (Third Judgment Component)

[0033] 200: Sound source device

[0034] P2: Second board (board)

[0035] R: Radius of the striking surface

[0036] T1b: Threshold (Second Threshold)

[0037] T2b: Threshold (First Threshold, First Value)

[0038] T3b: Threshold (First Threshold, Second Value) Detailed Implementation

[0039] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. First, referring to... Figure 1 and Figure 2 The overall structure of electronic drum 1 is explained. Figure 1 This is an exploded perspective view of the electronic drum 1 in one embodiment. Figure 2 This is a cross-sectional view of electronic drum 1. Additionally, in Figure 1 In the diagram, a portion of the electronic drum 1 is omitted for simplicity (e.g., Figure 2 An illustration of substrate 8, etc., as shown. Additionally, in Figure 2 The diagram shows a cross-section cut along the plane of the axis of the electronic drum 1.

[0040] like Figure 1 As shown, electronic drum 1 is an electronic percussion instrument that simulates an acoustic drum. Electronic drum 1 includes an upper part ( Figure 1 A cylindrical shell 2 with an opening at its upper end is provided, and a resin frame 3 is fixed to the inner circumference of the shell 2. The frame 3 includes a drooping portion 30 that hangs downward from the edge of the opening of the shell 2, and a bottom 31 that is connected to the lower end of the drooping portion 30.

[0041] The drooping portion 30 is formed in an annular (cylindrical) shape, and a disc-shaped bottom 31 is provided to block the lower end side of the drooping portion 30. That is, the frame 3 is formed in a downwardly recessed bowl shape, and the drumhead sensor 4 and the drum rim sensor 5 are mounted on the bottom surface of the frame 3 (the upper surface of the bottom 31) via the first plate P1 and the second plate P2. The first plate P1 and the second plate P2 are plates made of metal or resin materials.

[0042] The drum edge sensor 5 is a disc-shaped piezoelectric element used to detect vibrations when struck on the edge of the drum cavity 2 (the drum edge 7 described later). The drum edge sensor 5 is attached to the lower surface of the second plate P2. On the upper surface of the bottom 31 of the frame 3, a plurality of (three in this embodiment) upwardly protruding cylindrical first fixing parts 32 are provided, and the second plate P2 is screwed to the plurality of first fixing parts 32, thereby supporting the drum edge sensor 5 on the frame 3 via the second plate P2.

[0043] The drumhead sensor 4 includes a sensor part 40 and a buffer 41 attached to the upper surface of the sensor part 40. The sensor part 40 is a disc-shaped piezoelectric element, and the buffer 41 is a frustoconical buffer material formed using elastic materials such as sponge, rubber, or thermoplastic elastomer.

[0044] The sensor part 40 is attached to the upper surface of the first plate P1. On the upper surface of the bottom 31 of the frame 3, a pair of upwardly protruding cross-shaped second fixing parts 33 are provided, and the first plate P1 is screwed to the pair of second fixing parts 33, thereby supporting the drum skin sensor 4 on the frame 3 via the first plate P1.

[0045] If a pair of second fixing parts 33 are set as a group, then three groups of second fixing parts 33 are arranged along the circumference of the frame 3. That is, multiple (three in this embodiment) drumhead sensors 4 are arranged at equal intervals along the circumference of the frame 3, and the vibration of the drumhead 6 when struck is detected by the multiple drumhead sensors 4.

[0046] The drumhead 6 has a striking surface 60a, and an annular rim 7 protruding above the striking surface 60a is provided on the outer periphery of the striking surface 60a. A plurality of fastening parts 20 protrude radially from the outer periphery of the drum cavity 2, and the rim 7 is screwed into the plurality of fastening parts 20, thereby fixing the drumhead 6 and the rim 7 to the drum cavity 2.

[0047] like Figure 2 As shown, the drumhead 6 includes: a disc-shaped diaphragm portion 60 whose upper surface serves as a striking surface 60a, and an annular frame portion 61 connected to the outer edge of the diaphragm portion 60. The diaphragm portion 60 is formed using a mesh woven from synthetic fibers or a membrane made of synthetic resin, and the frame portion 61 is formed using a metal material or a resin material.

[0048] The drum rim 7 includes a drum rim portion 70 for applying tension to the drumhead 6, and a drum rim cover 71 covering the drum rim portion 70. The drum rim portion 70 includes a cylindrical annular portion 70a and a flange portion 70b that protrudes radially outward from the lower end side of the annular portion 70a, and is formed using a metallic material.

[0049] A drum edge cover 71 is embedded around the entire circumference of the upper portion of the annular portion 70a. The drum edge cover 71 is formed of an elastic material such as rubber. Therefore, the drum edge cover 71 has the function of protecting the drum edge portion 70 from impacts on the drum edge 7.

[0050] The flange portion 70b is the part that is screwed into the fastening portion 20 of the drum cavity 2. Therefore, with the frame portion 61 of the drumhead 6 disposed on the outer periphery of the drum cavity 2 and the drum edge 7 (drum edge portion 70) placed on the frame portion 61, the flange portion 70b is screwed into the fastening portion 20, thereby applying tension to the diaphragm portion 60 of the drumhead 6.

[0051] The frame 3 (bottom 31) supporting the drumhead sensor 4 is positioned facing downwards from the diaphragm 60. When tension is applied to the diaphragm 60, the buffer 41 of the drumhead sensor 4 contacts the lower surface of the diaphragm 60. Therefore, the vibration of the striking surface 60a of the diaphragm 60 when struck is transmitted to the sensor 40 via the buffer 41. Thus, the vibration of the striking surface 60a when struck is detected by multiple drumhead sensors 4.

[0052] In addition, a frame 3 supporting the drum edge sensor 5 is fixed on the inner circumference of the drum cavity 2 that fixes the drum edge 7. Therefore, the vibration of the drum edge 7 (drum edge cover 71) when it is struck is transmitted to the drum edge sensor 5 through the drum cavity 2 and the frame 3 (second plate P2), and the vibration is detected by the drum edge sensor 5.

[0053] The output signal based on the vibration detection of the drumhead sensor 4 and the drum rim sensor 5 is output to the substrate 8. The positive terminals of the sensor portions 40 (piezoelectric elements) of the plurality of drumhead sensors 4 are interconnected on the substrate 8, and the negative terminals are interconnected on the substrate 8. That is, the sensor portions 40 of the plurality of drumhead sensors 4 are connected in parallel on the substrate 8, and the output values ​​of the plurality of drumhead sensors 4 and the output values ​​of the drum rim sensor 5 are transmitted from the substrate 8 to the external control device 100 (see reference). Figure 5 Output. In the control device 100, the striking position is determined based on the ratio of the output value of the drumhead sensor 4 (the composite value of the output values ​​of multiple drumhead sensors 4) to the output value of the drum rim sensor 5.

[0054] Although details will be described later, in the control device 100, if the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" is set, then when the output ratio is relatively small, the output value of drumhead sensor 4 is relatively large, and therefore it is determined that a head-only shot performance has been performed, where only drumhead 6 has been struck. Conversely, when the output ratio is relatively large, the output value of drum rim sensor 5 is relatively large, and therefore it is determined that a rim-only shot performance has been performed, where only drum rim 7 has been struck. On the other hand, when the output ratio is moderate, it is determined that a rim-only shot performance has been performed, where both drumhead 6 and drum rim 7 have been struck (simultaneously).

[0055] In this situation, if the vibration of striking the drumhead 6 is falsely detected by the drum rim sensor 5, or if the vibration of striking the drum rim 7 is falsely detected by the drumhead sensor 4, it becomes easy to generate musical tones that do not match the actual playing technique of the performer. In contrast, this embodiment improves the detection accuracy of the striking position and can generate a structure for the musical tone corresponding to the striking with high precision. (Refer to...) Figure 2 , Figure 3 This structure will be explained.

[0056] Figure 3 yes Figure 2 A top view of electronic drum 1 viewed in the direction of arrow III. Additionally, in Figure 3 In the diagram, dashed lines are used to illustrate the shape of the drum edge sensor 5 and the upper surface of the buffer 41 of the drumhead sensor 4. Furthermore, when the radius R of the drumhead 60a is defined as the distance from the center O (axis O of the drum cavity 2) to the edge of the drumhead 60a (outer edge of the drum cavity 2), a circle drawn with a radius of 50% of R is depicted as an imaginary circle C1, and a circle drawn with a radius of 75% of R is depicted as an imaginary circle C2. The centers of the imaginary circles C1 and C2 are located at the center O of the drumhead 60a.

[0057] like Figure 3 As shown, the buffer 41 of the multiple drumhead sensors 4 contacts the lower surface of the drumhead 6 further out than the imaginary circle C1. Figure 3 (The inner side of the paper in the vertical direction). Therefore, the detection sensitivity of the drumhead sensor 4 can be suppressed from increasing in a region of the striking surface 60a, while at the same time, the detection accuracy of the striking position can be improved.

[0058] That is, for example, if the structure is such that the buffer 41 of multiple drumhead sensors 4 contacts the drumhead 6 on the inner side of the imaginary circle C1, the output value of the drumhead sensor 4 is more likely to be larger when the center O side of the striking surface 60a is struck, compared to the case where the edge side of the striking surface 60a has been struck. The sensitivity distribution of the strike in the striking surface 60a becomes uneven. Therefore, sometimes even though the center O side of the striking surface 60a and the drum edge 7 are struck simultaneously, it is determined that only the drumhead 6 has been struck, or even though the edge side of the striking surface 60a and the drum edge 7 are struck simultaneously, it is determined that only the drum edge 7 has been struck.

[0059] Furthermore, when the buffer 41 of the multiple drumhead sensors 4 contacts the drumhead 6 on the outside of the imaginary circle C2, the drumhead sensors 4 become prone to falsely detecting the vibration of the drumhead 7 being struck, since the drumhead sensors 4 are located near the drum edge 7.

[0060] In contrast, in this embodiment, the buffers 41 of the plurality of drumhead sensors 4 contact the drumhead 6 further outward than the imaginary circle C1, thus ensuring consistent output values ​​of the drumhead sensors 4 regardless of which position on the striking surface 60a of the drumhead 6 has been struck. Furthermore, the buffers 41 of the plurality of drumhead sensors 4 contact the drumhead 6 further inward than the imaginary circle C2, thereby suppressing vibrations caused by the drumhead sensors 4 falsely detecting a strike on the drum rim 7.

[0061] That is, in a region where the distance from the center O of the striking surface 60a is more than 50% and less than 75% of the radius R of the striking surface 60a, the buffers 41 of the multiple drumhead sensors 4 are made to contact the lower surface of the drumhead 6 (diaphragm 60). This makes the sensitivity distribution of the impact in the striking surface 60a more uniform and suppresses vibrations when the drumhead sensors 4 mistakenly detect an impact on the drum rim 7. Therefore, the detection accuracy of the impact position can be improved, and thus the musical tone corresponding to the impact (the player's playing technique) can be generated with high precision.

[0062] In addition, in the following description, the phrase "the buffer 41 of the drumhead sensor 4 contacts the lower surface of the drumhead 6 on the outer side (inner side) of the imaginary circle C1 (imaginary circle C2)" will be shortened to "the drumhead sensor 4 is positioned on the outer side (inner side) of the imaginary circle C1 (imaginary circle C2)".

[0063] Here, the drumhead sensor 4 and the drum rim sensor 5 are respectively supported on a common frame 3 (see reference). Figure 2 Therefore, there is a concern that the vibration of the drumhead 6 when it is struck is transmitted to the drum edge sensor 5 via the drumhead sensor 4 and the frame 3, and the drum edge sensor 5 may falsely detect the vibration.

[0064] Therefore, in this embodiment, in frame 3 (refer to...) Figure 2A drum edge sensor 5 is positioned on the central side of the frame 3 (overlapping with the center O of the striking surface in top view), and multiple drumhead sensors 4 are positioned closer to the outer edge of the frame 3 than the drum edge sensor 5. This allows the drumhead sensors 4 and drum edge sensors 5 to be positioned separately, thus suppressing the transmission of vibrations from the drumhead 6 to the drum edge sensors 5 via the drumhead sensors 4. Therefore, false detection of the vibrations by the drum edge sensors 5 can be suppressed, thereby improving the accuracy of the striking position detection.

[0065] Furthermore, the drum rim sensor 5 is positioned at the center O of the striking surface 60a (the center of the frame 3), and the drumhead sensor 4 is positioned outside the imaginary circle C1 and inside the imaginary circle C2. This allows the drumhead sensor 4 to be positioned separately from the drum rim sensor 5, and prevents the drumhead sensor 4 from being positioned too close to the drum rim 7. Therefore, it is possible to suppress the drum rim sensor 5 from falsely detecting vibrations when striking the drumhead 6, or the drumhead sensor 4 from falsely detecting vibrations when striking the drum rim 7, thereby improving the accuracy of the striking position detection.

[0066] Therefore, in order to improve the accuracy of impact position detection, in addition to suppressing false detections of vibration from the drumhead sensor 4 or the drum rim sensor 5, it is important to ensure that the sensor's sensitivity distribution to the impact is uniform regardless of which part of the drumhead 6 or drum rim 7 has been struck. In this case, for example, if the drum rim sensor 5 is positioned outside the imaginary circle C2, multiple drum rim sensors 5 must be arranged in the circumferential direction to ensure uniform sensitivity distribution when the drum rim 7 has been struck, thus increasing the number of parts.

[0067] In contrast, in this embodiment, such as Figure 2 As shown, the edge of the frame 3 (the upper part of the drooping portion 30) hangs around the edge of the opening of the drum cavity 2 in the entire circumferential direction, and a drum edge sensor 5 is arranged in the center of the frame 3. Therefore, regardless of where the drum edge 7 is struck in the circumferential direction, the distance (length of the vibration transmission path) from the striking point to the drum edge sensor 5 can be made uniform. Thus, a single drum edge sensor 5 can achieve a uniform sensitivity distribution for strikes to the drum edge 7, thereby reducing the number of parts and improving the accuracy of strike position detection.

[0068] On the other hand, when the drum edge sensor 5 is positioned in the center of the frame 3, the vibration transmission path from the drum edge 7 to the drum edge sensor 5 becomes longer. Therefore, compared to the case where the drum edge sensor 5 is positioned outside the imaginary circle C2, the vibration when the drum edge 7 is struck becomes more difficult to transmit to the drum edge sensor 5. In contrast, if the structure only improves the sensitivity of the drum edge sensor 5 itself, the drum edge sensor 5 may misdetect the vibration of the striking surface 60a of the drumhead 6 or external sound (vibration).

[0069] In contrast, this embodiment employs a structure that suppresses false detections in the drum edge sensor 5 and makes it easier for the drum edge sensor 5 to detect vibrations when the drum edge 7 is struck. For example, as Figure 2 As shown, the thickness of the second plate P2, to which the drum edge sensor 5 is attached, is set to be 2 mm or more (3 mm in this embodiment), and is formed to be thicker than the first plate P1, which is typically 1 mm thick. That is, the rigidity of the second plate P2 is set to be higher than that of the plate typically used to support the sensor.

[0070] Therefore, the bending of the second plate P2 due to vibrations transmitted through the air, such as vibrations of the striking surface 60a of the drumhead 6 or vibrations of external sounds, can be suppressed (the second plate P2 vibrates itself). This also suppresses the false detection of such vibrations by the drum edge sensor 5. In other words, although the output value of the drum edge sensor 5 may slightly decrease when the drum edge 7 is struck because the second plate P2 is difficult to bend, by suppressing the false detection of vibrations of the striking surface 60a of the drumhead 6 or external sounds by the drum edge sensor 5, the output ratio can be stabilized (deviations in the output ratio due to false vibration detection can be suppressed), thus improving the accuracy of the strike position detection.

[0071] Furthermore, since the second plate P2, on which the drum edge sensor 5 is mounted, is directly fixed to the frame 3 (first fixing part 32) without the use of an elastic material (e.g., rubber), the vibration from the impact on the drum edge 7 can be suppressed by the elastic member compared to the case where an elastic member is provided between the second plate P2 and the frame 3. Therefore, the vibration from the impact on the drum edge 7 can be easily transmitted to the drum edge sensor 5 via the frame 3 and the second plate P2.

[0072] Furthermore, the drum edge sensor 5 is bonded to the second plate P2 via a cushioning double-sided adhesive 50 (elastic material), so when the drum edge 7 is struck, the drum edge sensor 5 itself becomes easily bent (easily vibrates) due to the vibration transmitted through the frame 3 and the second plate P2. Thus, it becomes easy for the drum edge sensor 5 to detect the vibration when the drum edge 7 is struck.

[0073] In this way, the vibrations other than those of the impact on the drum edge 7 are suppressed by the drum edge sensor 5, and the vibrations of the impact on the drum edge 7 can be easily detected by the drum edge sensor 5, thereby improving the detection accuracy of the impact position.

[0074] In addition, the frame 3 has a rib 34 that protrudes upward from its bottom surface (the upper surface of the bottom 31). The area where the rib 34 is formed is prone to become a vibration transmission path. Therefore, in this embodiment, the first plate P1 of the attached drumhead sensor 4 is fixed in a position that avoids the rib 34 so that the drumhead sensor 4 does not mistakenly detect the vibration when the drum edge 7 is struck.

[0075] Specifically, the second fixing part 33 protrudes upwards from the rib 34, and the second fixing part 33 is formed as a pair across the rib 34. The first plate P1 is fixed at the upper end of the pair of second fixing parts 33, and the drumhead sensor 4 is mounted on the first plate P1. This suppresses the transmission of vibrations in the rib 34 to the drumhead sensor 4 via the second fixing part 33 and the first plate P1 when the drum rim 7 is struck, thus preventing false detection of the vibration by the drumhead sensor 4.

[0076] Furthermore, by fixing the first plate P1 at a position avoiding the rib 34, the vibration of the striking surface 60a of the drumhead 6 being struck can be suppressed from being transmitted to the drum edge sensor 5 via the drumhead sensor 4, the first plate P1, the second fixing part 33, and the rib 34. Therefore, the vibration can be prevented from being falsely detected by the drumhead sensor 4. Thus, the detection accuracy of the striking position can be improved.

[0077] Furthermore, the radially inner end of the rib 34 is connected to the first fixing part 32 that fixes the second plate P2, and the radially outer end of the rib 34 is connected to the drooping part 30 of the frame 3. That is, the rib 34 is arranged to extend radially from the inner periphery of the frame 3 to the fixing part of the second plate P2 and the frame 3, so the vibration when the drum edge 7 is struck can be easily transmitted to the drum edge sensor 5 via the drooping part 30, the rib 34, the first fixing part 32, and the second plate P2. Therefore, the vibration when the drum edge 7 is struck can be easily detected by the drum edge sensor 5, thereby improving the detection accuracy of the strike position.

[0078] In addition, in this embodiment, twelve ribs 34 extending radially in the frame 3 are arranged in the circumferential direction (multiple ribs 34 are formed radially). There are also ribs 34 that are not connected to the first fixing part 32, but it is not limited to this. For example, the ribs 34 that are not connected to the first fixing part 32 may be omitted.

[0079] Next, referring to Figures 4(a) and 4(b), the results of the impact test on the drumhead 6 and drum edge 7 using the electronic drum 1 constructed in the above manner will be described. In this impact test, the electronic drum 1 of this embodiment and the electronic drum of the comparative example, in which multiple drumhead sensors 4 are arranged on the outside of the imaginary circle C2, were used. In addition, except that the drumhead sensors 4 are arranged on the outside of the imaginary circle C2, the electronic drum of the comparative example has the same structure as the electronic drum 1.

[0080] This impact test was conducted on electronic drum 1 and the electronic drum of the comparative example, comparing the output values ​​of drumhead sensor 4 and drum rim sensor 5 when only the drumhead 6 was struck, when only the drumhead 6 and drum rim 7 were struck, and when only the drum rim 7 was struck. Figure 4(a) is a scatter plot showing the results of the impact test of the electronic drum of the comparative example, and Figure 4(b) is a scatter plot showing the results of the impact test of electronic drum 1 of this embodiment. In Figures 4(a) and 4(b), the vertical axis represents the output value of drum rim sensor 5, and the horizontal axis represents the output value of drumhead sensor 4.

[0081] As shown in Figure 4(a), in the electronic drum of the comparative example, the distribution of the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" when the drum edge is struck tends to be biased downwards (in the direction where the output value of drumhead sensor 4 increases). This can be attributed to the fact that in the electronic drum of the comparative example, the drumhead sensor 4 is positioned on an imaginary circle C2 (refer to...). Figure 3 The outer side of the drumhead sensor 4 is therefore prone to false detection of vibrations caused by the impact on the drumhead 7.

[0082] Therefore, in the electronic drum of the comparative example, the threshold T1a (the inclination of the straight line T1a) used to determine whether only the drumhead or the drum rim was struck must be set relatively large. As a result, even if the drum rim was struck, the cases determined to be only the drumhead are more frequent, and the frequency of musical notes not corresponding to the player's playing style increases.

[0083] On the other hand, as shown in FIG4(b), in the electronic drum 1 of this embodiment, the distribution of the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" when the drum edge is struck becomes biased upward (in the direction where the output value of drum edge sensor 5 increases) compared with the electronic drum of the comparative example.

[0084] The reason for this can be attributed to the fact that, in the electronic drum 1 of this embodiment, the drumhead sensor 4 is positioned on the imaginary circle C2 (refer to...). Figure 3 On the inner side of the drumhead, specifically at a distance from the center O of the striking surface 60a that is less than 75% of the radius R of the striking surface 60a, the drumhead sensor 4 becomes less likely to falsely detect vibrations from striking the drum rim 7. Consequently, the threshold T1b (the inclination of the straight line T1b) used to determine whether only the drumhead or the drum rim was struck is smaller than the threshold T1a of the comparative example electronic drum. Therefore, the difference between striking only the drumhead and striking the drum rim can be determined with high precision, thus enabling the generation of musical tones corresponding to the performer's playing style with high accuracy.

[0085] Furthermore, as shown in Figure 4(a), in the electronic drum of the comparative example, the distribution of the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" when only the drum edge is hit tends to be biased downwards (in the direction where the output value of drumhead sensor 4 increases). This can be attributed to the fact that in the electronic drum of the comparative example, the drumhead sensor 4 is positioned on an imaginary circle C2 (refer to...). Figure 3 The outer side of the drumhead sensor 4 is therefore prone to false detection of vibrations caused by the impact on the drumhead 7.

[0086] Therefore, in the electronic drum of the comparative example, the threshold T2a (the inclination of the straight line T2a) used to determine whether only the drum rim was struck or the drum rim was struck must be set relatively small. As a result, even though the drum rim was struck, the number of cases where it was determined to be only the drum rim was struck increases, and the frequency of musical notes not corresponding to the player's playing style increases.

[0087] On the other hand, as shown in FIG4(b), in the electronic drum 1 of this embodiment, the distribution of the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" when only the drum edge is hit becomes biased upward (in the direction where the output value of drum edge sensor 5 increases) compared with the electronic drum of the comparative example.

[0088] The reason for this can be attributed to the fact that, in the electronic drum 1 of this embodiment, the drumhead sensor 4 is positioned on the imaginary circle C2 (refer to...). Figure 3 The drumhead sensor 4 is located on the inner side of the drumhead 7, at a distance of less than 75% of the radius R of the drumhead 60a from the center O of the drumhead 60a. Therefore, it becomes difficult for the drumhead sensor 4 to falsely detect a strike to the drumhead 7. Consequently, the values ​​of thresholds T2b and T3b (the inclination of lines T2b and T3b) used to determine whether only the drumhead was struck or the drumhead was struck are larger than the threshold T2a of the comparative example electronic drum (the reasons for using these two values ​​will be explained later). Therefore, the difference between striking only the drumhead and striking the drumhead can be determined with high precision, thus enabling the generation of musical tones corresponding to the performer's playing style with high accuracy.

[0089] Furthermore, although the illustration is omitted, when the drumhead sensor 4 is positioned inside the imaginary circle C1 (at a distance of 50% of the radius R of the incomplete striking surface 60a from the center O of the striking surface 60a), a deviation is easily observed in the distribution of the output ratio of "output value of drumhead sensor 5 / output value of drumhead sensor 4" when the drumhead is struck. This can be attributed to either an uneven sensitivity distribution of the drumhead sensor 4 or an increased tendency for the drumhead sensor 5 to falsely detect strikes to the striking surface 60a of the drumhead 6.

[0090] In contrast, in the electronic drum 1 of this embodiment, a smaller deviation in the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" is achieved when only the drumhead is struck. This can be attributed to the fact that by positioning the drumhead sensor 4 outside the imaginary circle C1, specifically at a distance from the center O of the striking surface 60a that is at least 50% of the radius R of the striking surface 60a, the sensitivity distribution of the drumhead sensor 4 becomes more uniform, and the drum edge sensor 5 is less likely to falsely detect strikes to the striking surface 60a.

[0091] As described above, in the electronic drum 1 according to this embodiment, by arranging the drumhead sensor 4 between the imaginary circles C1 and C2, the sensitivity distribution of the drumhead sensor 4 can be made uniform, and vibrations when the drumhead sensor 4 mistakenly detects that the drum rim 7 has been struck can be suppressed. Furthermore, by arranging the drum rim sensor 5 on the central side of the frame 3, and arranging multiple drumhead sensors 4 closer to the outer edge of the frame 3 than the drum rim sensor 5 (arranging the drumhead sensor 4 and the drum rim sensor 5 in separate positions), vibrations when the drum rim sensor 5 mistakenly detects a strike to the striking surface 60a of the drumhead 6 can be suppressed. Therefore, the detection accuracy of the striking position can be improved, and thus, musical tones specific to the strike (the player's playing technique) can be generated with high precision.

[0092] Then, referring to Figure 5 and Figure 6 The details of the detection method for striking using the electronic drum 1 and the control device 100 are explained. Figure 5 This is a schematic functional block diagram illustrating the processing (functions) in the electronic drum 1 and the control device 100. Figure 6 This is a flowchart representing the process of determining the playing method.

[0093] like Figure 5 As shown, the output values ​​of the drumhead sensor 4 and the drum edge sensor 5 of the electronic drum 1 are output to an external control device 100. The control device 100 and the substrate 8 (see reference) Figure 2 The control device 100 includes: a strike determination unit 101 for determining the presence or absence of a strike, a playing technique determination unit 102 for determining the position (playing technique) of the strike, and a strike force calculation unit 103 for determining the strike force. Each of the strike determination unit 101, the playing technique determination unit 102, and the strike force calculation unit 103 is controlled by the central processing unit (CPU) (computing unit) of the control device 100.

[0094] The output value of the drumhead sensor 4 is output to the strike determination unit 101. That is, the strike determination unit 101 determines the impact on the drumhead 6 and the drum rim 7 (both referenced to the drumhead sensor 4) solely based on the output value of the drumhead sensor 4. Figure 2 The existence or absence of such a strike. The reasons are explained below.

[0095] As described above, the vibration of the drum edge 7 when it has been struck is transmitted to the drum edge sensor 5 with great force. When the drum edge 7 has been struck, the output value of the drum edge sensor 5 becomes larger than the output value of the drumhead sensor 4, but the deviation of the output value of the drumhead sensor 4 when the drum edge 7 has been struck becomes smaller than the deviation of the output value of the drum edge sensor 5.

[0096] The reason for this can be attributed to the fact that the drum edge sensor 5 is located in the center of the frame 3, while the drumhead sensor 4 is located on the outer edge of the frame 3 (see reference). Figure 2 The vibration transmission path from the drum rim 7 to the drumhead sensor 4 is shorter than the vibration transmission path from the drum rim 7 to the drum rim sensor 5 (vibration is transmitted through fewer components). That is, due to the structure of the electronic drum 1, the absolute value of the output value of the drum rim sensor 5 when the drum rim 7 has been struck becomes larger, but the stability of the output value of the drumhead sensor 4 becomes higher.

[0097] Therefore, as Figure 5 As shown, the output value of the drumhead sensor 4 is output to the strike determination unit 101. The presence or absence of a strike on the drumhead 6 and the drum edge 7 is determined solely based on the output value of the drumhead sensor 4, thereby enabling high-precision determination of the presence or absence of a strike.

[0098] If the strike determination unit 101 determines that the drumhead 6 or drum rim 7 has been struck (the drumhead sensor 4 detects an output value exceeding a predetermined value), the strike determination unit 101 outputs a signal containing information about the presence or absence of the strike (information of a strike) to the playing technique determination unit 102. Furthermore, the playing technique determination unit 102 identifies the type of playing technique of the strike.

[0099] Furthermore, in the following description, when the techniques of striking only the drum rim (first technique), striking only the drum rim (second technique), and striking only the drumhead (third technique) are collectively referred to as "each technique," they will be described as such. In order for the technique determination unit 102 to identify each technique, the output values ​​of the drumhead sensor 4 and the drum rim sensor 5 are each output to the technique determination unit 102. Here, refer to... Figure 6 The playing technique determination process in the playing technique determination unit 102 will be explained.

[0100] like Figure 6 As shown, in the playing technique determination process, firstly, when the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" is set, it is confirmed whether the output ratio is lower than 0.2 (a specified threshold) (S1). If the output ratio is lower than 0.2 (S1: Yes), the output value of drumhead sensor 4 is relatively large, and only the drumhead 6 (refer to...) Figure 2 The possibility of being hit is high, so it is determined that only the drumhead (S2) was hit, thus ending the series of processes.

[0101] On the other hand, when the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" is 0.2 or higher (S1: No), the output value of drum rim sensor 5 is relatively large, and the drum rim 7 is more likely to be struck. In this case, it is necessary to distinguish whether the playing technique of striking only the drum rim or striking the drum rim was performed. In this embodiment, the structure can perform the discrimination with high accuracy.

[0102] The structure will be explained with reference to FIG4(b). As shown in FIG4(b), it can be seen that the distribution of the output value when only the drumhead is struck has a small width in the vertical axis direction, making it difficult to produce deviation. This can be attributed to the fact that the drumhead sensor 4 directly contacts the diaphragm 60 of the drumhead 6 (see FIG4). Figure 2 When the drumhead 6 has been struck, the output value of the drumhead sensor 4 is stable.

[0103] Therefore, even if the threshold T1b (0.2 in this embodiment) for distinguishing between striking only the drumhead and striking only the drum rim is a constant, the distinction can be made with relatively high accuracy. Furthermore, since the threshold T1b is a constant, the processing time for distinguishing between striking only the drumhead and striking only the drum rim can be shortened compared to setting the threshold T1b as a variable or multiple constants. Therefore, the time from striking to sound production can be shortened, thus giving the performer a more natural playing feel.

[0104] On the other hand, it can be seen that the distribution of output values ​​when only the drum rim is struck has a relatively large width along the horizontal axis (which makes it prone to deviation). More specifically, when only the drum rim is struck with a strong strike, and the output value of the drum rim sensor 5 is large, the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" tends to be larger. In contrast, when only the drum rim is struck with a weak strike, and the output value of the drum rim sensor 5 is small, the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" tends to be smaller compared to the case of a strong strike.

[0105] The reason for this can be attributed to the relatively long vibration transmission path from the drum rim 7 to the drum rim sensor 5. Therefore, when only the drum rim is struck with a weak strike, the output value of the drum rim sensor 5 is particularly prone to becoming smaller compared to a strong strike. In this case, if only the threshold T2b (0.3 in this embodiment) is used to distinguish between striking only the drum rim and striking the drum rim (refer to the dotted line in Figure 4(b)), it becomes easy to misjudge as striking only the drum rim when the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" is relatively large.

[0106] In contrast, in this embodiment, when distinguishing between striking only the drum rim and striking the drum rim, if the output value of the drumhead sensor 4 is less than 0.4V (less than a predetermined value), a threshold T2b (0.3 in this embodiment) is used for distinction; if the output value of the drumhead sensor 4 is 0.4V or higher, a threshold T3b (0.5 in this embodiment), which is larger than the threshold T2b, is used for distinction. Therefore, when striking the drum rim results in a relatively large output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4," it becomes less likely to be mistakenly determined as striking only the drum rim. Thus, it is possible to distinguish between striking only the drum rim and striking the drum rim with high accuracy.

[0107] Back Figure 6 Please provide an explanation. For example... Figure 6 As shown, if the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" is 0.2 or higher (S1: No), it is confirmed whether the output value of drumhead sensor 4 is less than 0.4 (V) (S3). The processing in S3 is to distinguish between striking only the drum edge and striking the drum edge, using two thresholds based on whether the output value of drumhead sensor 4 is less than 0.4 (V).

[0108] If the output value of drumhead sensor 4 is less than 0.4 (V) (S3: Yes), check if the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" is less than 0.3 (first value) (S4). If the output ratio is less than 0.3 (S4: Yes), it is determined that the drum rim has been struck (S5), and the series of processes ends.

[0109] On the other hand, if the output ratio of "output value of drum edge sensor 5 / output value of drum skin sensor 4" is 0.3 (first value) or higher (S4: no), it is determined that only the drum edge was struck (S6), and the series of processes ends.

[0110] In the S3 process, if the output value of the drumhead sensor 4 is 0.4 (V) or higher (S3: No), it is checked whether the output ratio of "output value of drum rim sensor 5 / output value of drumhead sensor 4" is less than 0.5 (second value) (S7). If the output ratio is less than 0.5 (S7: Yes), it is determined that the drum rim has been struck (S5), and the series of processes ends.

[0111] On the other hand, if the output ratio of "output value of drum edge sensor 5 / output value of drumhead sensor 4" is 0.5 (second value) or higher (S7: no), it is determined that only the drum edge was struck (S6), and the series of processes ends.

[0112] Thus, in the playing method determination process of this embodiment, when distinguishing between striking only the drum edge and striking the drum edge, different thresholds are used (the thresholds are changed) according to the magnitude of the output value of the drumhead sensor 4, so that striking only the drum edge and striking the drum edge can be distinguished with high accuracy.

[0113] Here, in order to change the threshold according to the output value of the drumhead sensor 4 as in this embodiment, for example, the threshold could be set as a variable (the threshold increases as the output value of the drumhead sensor 4 increases). However, in this structure, the processing time for distinguishing between striking only the drum rim and striking the drum rim becomes longer, thus easily generating a delay time from the strike to the sound.

[0114] In contrast, according to the playing technique determination process of this embodiment, the threshold for distinguishing between striking only the drum rim and striking the drum rim is two constants. Therefore, compared to setting the threshold as a variable or three or more constants, the processing time for distinguishing between striking only the drum rim and striking the drum rim can be shortened. As a result, the time from striking to producing sound can be shortened, thus giving the performer a more natural playing feel.

[0115] After the above playing technique determination process is performed by the playing technique determination unit 102, as follows: Figure 5 As shown, the playing technique determination unit 102 outputs a signal containing information about the type of playing technique to the impact force calculation unit 103. In the impact force calculation unit 103, the impact force of each playing technique is calculated. In the impact force calculation unit 103, the impact force of striking only the drumhead is calculated based on the output value of the drumhead sensor 4, which has been output to the impact force calculation unit 103. As described above, the output value of the drumhead sensor 4 is easier to stabilize than that of the drum rim sensor 5; therefore, by using only the output value of the drumhead sensor 4 to calculate the impact force, the impact force of striking only the drumhead can be calculated with high accuracy.

[0116] On the other hand, in the impact force calculation unit 103, the impact force of striking only the drum edge and the impact force of striking the drum edge are calculated based on the output value of the drumhead sensor 4 and the output value of the drum rim sensor 5, which have been output to the impact force calculation unit 103. By using the output value of the drumhead sensor 4, whose output value is easy to stabilize, and the output value of the drum rim sensor 5, which represents the intensity of the strike to the drum rim 7, the impact force can be calculated with high accuracy for striking only the drum edge and the impact force of striking the drum rim.

[0117] Furthermore, a signal containing information including the impact force calculated by the impact force calculation unit 103 and the type of playing method identified by the playing method determination unit 102 is output to an external sound source device 200. In the sound source device 200, a musical tone signal based on the determination result of the control device 100 is generated, and the musical tone signal is output from the sound source device 200 to an amplifier or a loudspeaker (neither shown). Thus, electronic musical tones corresponding to each playing method are emitted from the loudspeaker.

[0118] Thus, in this embodiment, the structure is designed to calculate the force of striking only the drum rim based on the output values ​​of the drumhead sensor 4 and the drum rim sensor 5. In this structure, for example, the force of striking only the drum rim can also be calculated using the average of the output values ​​of the drumhead sensor 4 and the drum rim sensor 5, which is "(output value of drumhead sensor 4 + output value of drum rim sensor 5) / 2". However, this calculation method cannot impart a natural playing feel to the performer.

[0119] In other words, even when striking only the drum rim and only the drumhead with the same force, the output value of the drum rim sensor 5 is smaller when only the drum rim is struck than the output value of the drumhead sensor 4 when only the drumhead is struck. Therefore, if the striking force of striking only the drum rim is calculated using the average of the output values ​​of the drumhead sensor 4 and the drum rim sensor 5, the calculated striking force of striking only the drum rim is smaller than the striking force of striking only the drumhead, even with the same force applied. Therefore, when only the drum rim is struck, an appropriate electronic sound corresponding to the actual striking force cannot be emitted from the speaker.

[0120] In contrast, in this embodiment, when the playing technique determination unit 102 determines that only the drumhead has been struck, the striking force calculation unit 103 directly calculates the striking force using the output value of the drumhead sensor 4 (without amplification). On the other hand, when the playing technique determination unit 102 determines that only the drum rim has been struck (drum rim strike), the striking force calculation unit 103 calculates the striking force using the average of the output value of the drumhead sensor 4 and the output value of the drum rim sensor 5, which has been amplified by a predetermined amount (e.g., amplified three times), which is "(output value of drumhead sensor 4 + output value of drum rim sensor 5 × 3) / 2".

[0121] A signal containing information about the amplified striking force (intensity of the strike), as described above, is output to the sound source device 200. Therefore, when only the drum rim is struck (drum rim striking), the musical tone signal output from the sound source device 200 to the amplifier or speaker is also amplified. Thus, an appropriate electronic musical tone corresponding to the actual striking force in each playing technique can be emitted from the speaker, thereby giving the performer a natural playing feel.

[0122] The above description is based on the embodiments described, but the present invention is not limited to any of the embodiments described, and it is easy to deduce that various modifications and variations can be made without departing from the spirit of the present invention.

[0123] In the described embodiment, the case where the drumhead sensor 4 is arranged outside the imaginary circle C1 and inside the imaginary circle C2 has been described, but it is not necessarily limited to this. For example, the structure where the drumhead sensor 4 is arranged inside the imaginary circle C1 or outside the imaginary circle C2 is also possible.

[0124] In the described embodiment, a drum edge sensor 5 is arranged at the center of the frame 3 (the center O of the striking surface 60a), but it is not necessarily limited to this. For example, one or more drum edge sensors 5 may be arranged on the outer edge of the frame 3 (e.g., further outward than the imaginary circle C1).

[0125] In the described embodiment, the case where the outer peripheral edge of the frame 3 is attached to the edge of the opening of the drum cavity 2 is explained, but it is not necessarily limited to this. For example, it is also possible to have a structure in which the outer peripheral edge of the frame 3 is fixed to the inner peripheral surface of the drum cavity 2. That is, as long as at least a portion of the frame 3 is connected to the drum cavity 2, the method of fixing the frame 3 to the drum cavity 2 is not limited to the described form.

[0126] In the described embodiment, the drumhead sensor 4 and the drum rim sensor 5 are supported on the frame 3 via the first plate P1 and the second plate P2, but this is not a limitation. For example, the drumhead sensor 4 or the drum rim sensor 5 may be directly supported on the frame 3 (drooping portion 30 or bottom 31) without being supported via the first plate P1 and the second plate P2. In this case, the first fixing portion 32 or the second fixing portion 33 may be omitted.

[0127] In the described embodiment, the drum edge sensor 5 is supported on the frame 3 by a second plate P2, which has a higher rigidity than the first plate P1 supporting the drumhead sensor 4, but this is not a limitation. The rigidity of the second plate P2 supporting the drum edge sensor 5 may also be set to be the same as (or lower than) the rigidity of the first plate P1 supporting the drumhead sensor 4.

[0128] In the described embodiment, the case where rigidity is improved by increasing the thickness of the second plate P2 supporting the drum edge sensor 5 is explained, but it is not necessarily limited to this. For example, the rigidity of the second plate P2 can be improved compared to the first plate P1 by changing the material of the plate or increasing the number of plates.

[0129] In the described embodiment, the second plate P2 supporting the drum edge sensor 5 is fixed to the frame 3 without the use of an elastic member, but this is not a limitation. For example, the second plate P2 supporting the drum edge sensor 5 may also be fixed to the frame 3 via an elastic member (rubber or cushioning double-sided tape, etc.).

[0130] In the described embodiment, the drum edge sensor 5 is supported on the second plate P2 via a cushioning double-sided adhesive 50 (elastic material), but this is not a limitation. For example, other elastic materials (e.g., rubber) besides double-sided adhesive 50 can be used as long as the drum edge sensor 5 can be elastically supported.

[0131] In the described embodiment, the rib 34 protruding upward from the bottom surface of the frame 3 is provided in a manner that extends radially in the frame 3, but this is not necessarily the case. For example, the direction in which the rib 34 is formed can be appropriately set, or the structure may omit the rib 34.

[0132] In the described embodiment, the case where the first plate P1 supporting the drumhead sensor 4 is fixed to the frame 3 at a position avoiding the rib 34 has been described, but it is not necessarily limited to this. For example, it is also possible to have a structure in which the first plate P1 is fixed to the rib 34 (with the portion corresponding to the second fixing part 33 set at a position overlapping the rib 34).

[0133] In the described embodiment, the case where the radially inner end of the rib 34 is connected to the first fixing part 32 for fixing the drum edge sensor 5 has been described, but it is not necessarily limited to this. For example, the structure may not be such that the rib 34 is connected to the first fixing part 32.

[0134] In the described embodiment, when distinguishing between striking only the drum rim and striking the drum rim, a threshold T2b (first value) is used for distinction when the output value of the drumhead sensor 4 is less than 0.4V (less than a predetermined value), and a threshold T3b (second value), which is larger than the threshold T2b, is used for distinction when the output value of the drumhead sensor 4 is 0.4V or greater. However, this is not a limitation. For example, it is also possible to use a variable (a value proportional to the output value of the drumhead sensor 4) or three or more constants for the threshold when distinguishing between striking only the drum rim and striking the drum rim. In any structure, as long as the output value of the drumhead sensor 4 increases, the threshold becomes larger.

[0135] Alternatively, the structure could be as follows: the threshold value is not based on the output value of the drumhead sensor 4. For example, in distinguishing between striking only the drum rim and striking the drum rim, when the output value of the drum rim sensor 5 is less than 0.4V (less than the specified value), the threshold T2b is used for distinction, and when the output value of the drum rim sensor 5 is greater than or equal to 0.4V (greater than the specified value), the threshold T3b is used for distinction.

[0136] In the described embodiment, the distinction between different playing techniques is explained based on the ratio of the output value of the drumhead sensor 4 (the composite value of the output values ​​of multiple drumhead sensors 4) to the output value of the drum rim sensor 5, but this is not necessarily the case. For example, it is also possible to distinguish different playing techniques based on the difference between the output value of the drumhead sensor 4 (the composite value of the output values ​​of multiple drumhead sensors 4) and the output value of the drum rim sensor 5, or to provide the component for distinguishing different playing techniques (equivalent to the structure of the control device 100) on the substrate 8.

[0137] Alternatively, the structure could distinguish between different playing techniques based on the ratio of "drumhead sensor 4 output value / drum rim sensor 5 output value" or the difference between "drumhead sensor 4 output value - drum rim sensor 5 output value". When distinguishing between striking only the drum rim and striking the drum rim using this structure, the threshold can be set as a variable or as two or more constants, such that the larger the output value of drumhead sensor 4, the smaller the threshold becomes. This allows for high-precision distinction between striking only the drum rim and striking the drum rim.

[0138] In the described embodiment, the case where the impact force of striking only the drum rim (striking the drum rim) is calculated by the impact force calculation unit 103 using the output values ​​of the drumhead sensor 4 and the drum rim sensor 5 is explained, but it is not necessarily limited to this. For example, the impact force of striking only the drum rim (striking the drum rim) may be calculated using only the output value of the drumhead sensor 4, and the impact force of striking only the drum rim (striking the drum rim) may be calculated using only the output value of the drum rim sensor 5.

[0139] In the described embodiment, the impact force is calculated directly using the output value of the drumhead sensor 4 (without amplification) when only the drumhead is struck, but it is not necessarily limited to this. For example, it is also possible to calculate the impact force by amplifying the output value of the drumhead sensor 4 by a predetermined amount when only the drumhead is struck.

[0140] Furthermore, in the described embodiment, the striking force is calculated by averaging the output value of the drumhead sensor 4 and the amplified output value of the drum rim sensor 5 when only the drum rim is struck (drum rim striking), but this is not necessarily the case. For example, the structure could be as follows: when only the drum rim is struck (drum rim striking), the striking force is calculated by averaging the output value of the drumhead sensor 4 and the output value of the drum rim sensor 5 (without amplifying the output value of the drum rim sensor 5), and based on the calculated striking force, a musical sound signal amplified by a predetermined amount is generated by the sound source device 200.

[0141] That is, as long as the structure can emit electronic musical sounds from the loudspeaker that correspond to the actual percussion force in each playing method, the degree to which the output value of the drumhead sensor 4 or the drum rim sensor 5 is amplified in each playing method (how to perform weighted correction) or the timing of signal amplification (through which component amplifies the signal) can be appropriately set.

Claims

1. An electronic percussion instrument, characterized by, include: The drumhead, with its upper surface forming the striking surface; The cylindrical main body has an opening at the upper end covered by the drum skin; The frame is fixed to the inner circumference of the main body and faces the lower surface of the drumhead; A drum edge sensor, supported by the frame, detects impacts to the edge of the main body. as well as Multiple drumhead sensors, supported in the frame, contact the lower surface of the drumhead to detect impacts on the striking surface; The drum edge sensor is positioned on the central side of the frame. Multiple drumhead sensors are positioned closer to the outer edge of the frame than the drum rim sensors. The frame includes ribs that project upwards from the bottom surface of the frame and extend radially thereafter; and The drumhead sensor is supported by the frame in a position that avoids the ribs.

2. The electronic percussion instrument of claim 1, wherein, Multiple drumhead sensors contact the lower surface of the drumhead in an area where the distance from the center of the striking surface is more than 50% and less than 75% of the radius of the striking surface.

3. The electronic percussion instrument of claim 1 or 2, wherein, The outer peripheral edge of the frame hangs on the edge of the opening in the main body. The drum edge sensor is supported in the frame by a plate with a thickness of 2 mm or more.

4. The electronic percussion instrument according to claim 3, characterized in that, The framework includes: A fixing part protrudes upward from the bottom surface of the frame to fix the plate; The radially inner end of the rib is connected to the fixing part.

5. A percussion detection method, which is the percussion detection method for the electronic percussion instrument as described in claim 1, characterized in that, The method includes a first determination step, in which the ratio or difference between the output value of the drum edge sensor and the output value of the drumhead sensor is compared with a first threshold to distinguish between a first playing technique in which only the edge of the main body is struck, and a second playing technique in which both the striking surface and the edge of the main body are struck.

6. The strike detection method according to claim 5, characterized in that, The plurality of drumhead sensors are made to contact the lower surface of the drumhead in an area where the distance from the center of the striking surface is more than 50% and less than 75% of the radius of the striking surface.

7. The impact detection method according to claim 5 or 6, characterized in that, The first determination step compares the ratio or difference between the output value of the drum edge sensor and the output value of the drumhead sensor with a second threshold to distinguish between the second playing method and the third playing method in which only the striking surface is struck.

8. The impact detection method according to claim 5 or 6, characterized in that, The first threshold is a value that varies depending on the magnitude of the output value of the drumhead sensor or the drum edge sensor.

9. The strike detection method according to claim 8, characterized in that, The first threshold includes two constants: a first value and a second value. The first value is used when the output value of the drumhead sensor or the drum edge sensor is less than a specified value, and the second value is used when the output value of the drumhead sensor or the drum edge sensor is greater than or equal to a specified value.

10. The impact detection method according to claim 5 or 6, characterized in that, It also includes a second determination step, which determines whether the first playing technique and the second playing technique are used for striking based on the output value of the drumhead sensor.

11. The impact detection method according to claim 5 or 6, characterized in that, It also includes a third determination step, which determines the striking force of the first playing method or the second playing method based on the output value of the drumhead sensor and the output value of the drum edge sensor.

12. The strike detection method according to claim 11, characterized in that, Output a musical tone signal based on the impact force determined by the third determination step. The third determination step further determines the striking force of the third playing technique, where only the striking surface is struck, based on the output value of the drumhead sensor. If the first or second playing method is performed, the striking force determined by the third determination step will be amplified and output.

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