Hand disc automatic playing device and method based on multi-channel electromagnetic pulse

Abstract

The invention relates to an automatic hand disc playing device and method based on multi-channel electromagnetic pulses. The automatic hand disc playing device comprises a tool bottom plate, a playing support, a plurality of driving elements and a controller. A tool hole is formed in the tool bottom plate, the tool bottom plate is used for containing the hand disc, and one end of the hand disc is located in the tool hole. The playing support is arranged on the tool bottom plate, and the hand disc is located in the playing support. The driving element is arranged on the playing support and comprises a pulse current transmitting assembly and a driving coil. The playing method is implemented based on the hand disc automatic playing device, and comprises the steps of receiving a music score file and generating a plurality of note information arranged in sequence; and according to the note information arranged in sequence, discharging to the corresponding driving coil so as to enable the sounding area to sound. The hand disc is knocked through the electromagnetic effect to achieve sound production, more, more flexible and more accurate control capacity is achieved based on electromagnetic driving, and the structure is light.

Description

Technical Field

[0001] The present invention relates to the field of musical instruments, and particularly to an automatic playing device and method for a hang drum based on multi-channel electromagnetic pulses. Background Art

[0002] Automatic playing devices have a history of more than a hundred years. For example, an automatic playing piano controls multiple electromagnetic components to attract each key to move, driving the hammers to strike strings of different lengths to produce sounds.

[0003] As a percussion instrument, most of the existing automatic playing of percussion instruments controls the striking components to strike the vibrating components in the instrument through mechanical structures. The mechanical structure simulation and control generally have a complex composition. The hang drum is a metal structure sounding instrument that is easy to play. Therefore, there is an urgent need for an automatic playing device with a simple structure and easy to control the hang drum. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] The present invention provides an automatic playing device for a hang drum based on multi-channel electromagnetic pulses, aiming to solve the problem that the automatic playing device for controlling the hang drum in the prior art is too complex.

[0006] (2) Technical Solutions

[0007] To solve the above problems, the present invention provides an automatic playing device for a hang drum based on multi-channel electromagnetic pulses. The automatic playing device for the hang drum includes: a tooling base plate, a playing bracket, a driving element, and a controller;

[0008] Tooling holes are provided on the tooling base plate. The tooling base plate is used for placing the hang drum, and one end of the hang drum is located in the tooling holes;

[0009] The playing bracket is arranged on the tooling base plate, and the hang drum is located inside the playing bracket;

[0010] The driving element is arranged on the playing bracket. The driving element includes a pulse current emitting component and a driving coil;

[0011] The pulse current emitting component is connected to the driving coil, and the pulse current emitting component can provide pulse current into the driving coil;

[0012] The controller is connected to the pulse current emitting component, and the controller can control the pulse current emitting component to emit pulse current to the driving coil;

[0013] The driving coil is arranged close to the sounding area of the hang drum, and the sounding area of the hang drum can vibrate under the action of the driving coil.

[0014] Preferably, the playing support includes: a first ring, a second ring, a disc, and an angle adjustment member;

[0015] The first ring is arranged on the tooling bottom plate, and the handpan is located inside the first ring;

[0016] The second ring is located above the first ring, and a plurality of vertical connecting members are arranged between the first ring and the second ring;

[0017] The disc and the second ring are in the same horizontal plane, and the disc is located inside the second ring. A plurality of horizontal connecting members are arranged between the second ring and the disc;

[0018] The horizontal connecting members correspond to the vertical connecting members one by one. One end of the angle adjustment member is installed on the horizontal connecting member, the other end of the angle adjustment member is installed on the corresponding vertical connecting member, and the drive coil is installed on the angle adjustment member.

[0019] Preferably, the drive element further includes a drive housing, and the drive coil is installed inside the drive housing;

[0020] The vertical connecting member includes a pair of vertical rods, the horizontal connecting member includes a pair of horizontal rods, the angle adjustment member includes a pair of mounting rods, and the mounting rods are used to connect the vertical rods and the horizontal rods;

[0021] The drive housing is installed on a pair of the mounting rods.

[0022] Preferably,

[0023] A plurality of vertical strip-shaped holes are arranged in an array on the vertical rod, and a vertical connecting block is arranged on the vertical rod. The vertical connecting block can be installed at different positions on the vertical rod through the vertical strip-shaped holes;

[0024] A plurality of horizontal strip-shaped holes are arranged in an array on the horizontal rod, and a horizontal connecting block is arranged on the horizontal rod. The horizontal connecting block can be installed at different positions on the horizontal rod through the horizontal strip-shaped holes;

[0025] One side of the mounting rod is connected to the horizontal connecting block, and the other side of the mounting rod is connected to the vertical connecting block.

[0026] Preferably, a plurality of connecting strip-shaped holes for the drive housing are arranged in an array on the mounting rod.

[0027] Preferably, the cross-sections of the vertical connecting block and the horizontal connecting block are both L-shaped.

[0028] Preferably, the disc is located at the top of the hang, and the driving coil is provided on one side of the disc facing the hang.

[0029] Preferably, the hang automatic playing device further includes a driving power supply, and the pulsed current emitting assembly includes a driving capacitor and a thyristor;

[0030] The driving power supply is used to charge the driving capacitor. The thyristor is arranged on the circuit connecting the driving capacitor and the driving coil. The control end of the thyristor is connected to the controller, and the controller can control the on-off of the thyristor.

[0031] Preferably, a groove for accommodating the playing bracket is provided on the tooling base plate.

[0032] Preferably, the present invention also provides a hang automatic playing method based on multi-channel electromagnetic pulses. The playing method is implemented based on the above-mentioned hang automatic playing device, and the hang automatic playing method includes:

[0033] Receiving a score file, parsing the score file and obtaining score data, where the score data includes a plurality of note information arranged in sequence;

[0034] According to the plurality of note information arranged in sequence, controlling the corresponding pulsed current emitting assembly to discharge to the corresponding driving coil, so that the sounding area makes a sound.

[0035] (III) Beneficial effects

[0036] By passing a pulsed current through the driving coil, a changing magnetic field is generated on the driving coil, and the hang is struck by electromagnetic action to make a sound and thus complete automatic playing. Based on electromagnetic drive, there are more, more flexible and more accurate control capabilities. It avoids direct physical contact with the hang, reduces most of the transmission mechanisms, and simplifies the knocking structure. Description of the drawings

[0037] Figure 1 is a schematic structural diagram of the hang automatic playing device of the present invention;

[0038] Figure 2 is a schematic structural diagram of another perspective of the hang automatic playing device of the present invention;

[0039] Figure 3 is Figure 2 an enlarged view at A;

[0040] Figure 4 is a schematic diagram of the hang automatic playing system;

[0041] Figure 5 is a signal conversion flow chart of subsystem 2;

[0042] Figure 6 This is the circuit connection diagram of the drive coil and drive capacitor in the present invention;

[0043] Figure 7 This is the connection diagram between the controller and the drive coil in the present invention.

[0044]

Explanation of the attached drawing reference numerals

[0045] 1: Tooling base plate; 10: Tooling hole; 11: Groove;

[0046] 2: Performance bracket; 21: First ring; 22: Second ring; 23: Disc; 24: Vertical connecting member; 241: Vertical rod; 242: Vertical strip hole; 243: Vertical connecting block; 25: Horizontal connecting member; 251: Horizontal rod; 252: Horizontal strip hole; 253: Horizontal connecting block; 26: Angle adjustment member; 261: Mounting rod; 262: Connecting strip hole;

[0047] 3: Driving element; 31: Driving housing; 32: Drive coil; 33: Drive capacitor; 34: Thyristor;

[0048] 4: Hang drum; 40: Sounding area. Detailed implementation manners

[0049] In order to better explain the present invention for easy understanding, the present invention will be described in detail below with reference to the attached drawings through specific implementation manners.

[0050] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0051] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The handpan 4 is an easy-to-play metal-structured sounding instrument, which is composed of two hemispherical steel molds combined through nitriding treatment. This device combines electromagnetic pulse drive with the handpan 4 and utilizes the advantage that electromagnetic drive can precisely control the percussion time and intensity to automatically perform sequential pulse excitation on each sounding area of the handpan 4, thereby forming a sequential sound signal consistent with the music score and completing the automatic performance of music. The performance bracket 2 is arranged on the tooling base plate 1, and the handpan 4 is located inside the performance bracket 2. The electromagnetic pulse-driven sound source is a sounding technology. It discharges through a coil, and then induces an electric current in the adjacent metal plate, so that the metal plate is excited by the electromagnetic pulse force to produce sound. The intensity of its sound production depends on the magnitude of the coil current, and the sounding frequency is related to the structure of the metal plate.

[0054] The present invention provides a handpan 4 automatic performance device based on multi-channel electromagnetic pulses. The handpan 4 automatic performance device includes: a tooling base plate 1, a performance bracket 2, and a plurality of driving elements 3. A tooling hole 10 is arranged on the tooling base plate 1. The tooling base plate 1 is used to place the handpan 4, and one end of the handpan 4 is located inside the tooling hole 10. The driving elements 3 are arranged on the performance bracket 2. The driving elements 3 include a pulse current emission component and a driving coil 32. The pulse current emission component is connected to the driving coil 32, and the pulse current emission component can provide a pulse current into the driving coil 32. The driving coil 32 is arranged close to the sounding area 40 of the handpan 4, and the sounding area 40 of the handpan 4 can vibrate under the action of the driving coil 32. Specifically, eight driving elements 3 are arranged on the performance bracket 2, that is, eight driving coils 32 are arranged. Each driving coil 32 corresponds to a sounding area 40 on the handpan 4 respectively. The eight sounding areas on the handpan correspond to eight notes. By independently controlling the excitation of the sounding area 40 on the handpan 4 by the eight driving coils 32 respectively, the performance is completed.

[0055] The present invention provides a tooling base plate 1 under the playing bracket 2, and tooling holes 10 are provided on the tooling base plate 1 for placing the handpan 4, facilitating the fixation of the handpan 4. In addition, the handpan 4 is placed under the playing bracket 2, and then the drive coil 32 on the playing bracket 2 is aligned with the sounding area 40 on the handpan 4. When the pulse current emitting component emits a pulse current to the drive coil 32, when the pulse current passes through the drive coil 32, according to the principle of electromagnetic induction, a changing electromagnetic field is generated around the drive coil 32. The metal structure of the sounding area 40 on the handpan 4 induces an electromotive force and current due to this electromagnetic field. The induced current is affected by the changing magnetic force. Since the direction of the magnetic force continuously changes, the metal structure of the sounding area 40 on the handpan 4 is subjected to a periodically changing force, and then vibrates and emits sound in the corresponding sound area, completing the process from the input of the musical score signal to the final sounding of the handpan 4. By passing a pulse current through the drive coil 32, a changing magnetic field is generated on the drive coil 32, and the handpan 4 is struck by electromagnetic action to achieve sounding and thus complete automatic playing. Based on electromagnetic drive, it has more, more flexible and more precise control capabilities. Using the drive coil 32 to strike the handpan 4 avoids direct physical contact with the handpan 4, reduces most of the transmission mechanisms, and simplifies the striking structure. A groove 11 for accommodating the playing bracket 2 is provided on the tooling base plate 1.

[0056] Further, the playing bracket 2 includes: a first ring 21, a second ring 22, a disc 23, and an angle adjustment member 26. The first ring 21 is provided on the tooling base plate 1, and the handpan 4 is located inside the first ring 21. The second ring 22 is located above the first ring 21, and a plurality of vertical connecting members 24 are provided between the first ring 21 and the second ring 22. The disc 23 and the second ring 22 are in the same horizontal plane, and the disc 23 is located inside the second ring 22. A plurality of horizontal connecting members 25 are provided between the second ring 22 and the disc 23. The horizontal connecting members 25 correspond to the vertical connecting members 24 one by one. One end of the angle adjustment member 26 is installed on the horizontal connecting member 25, the other end of the angle adjustment member 26 is installed on the corresponding vertical connecting member 24, and the drive coil 32 is installed on the angle adjustment member 26.

[0057] In this embodiment, there is an included angle (preferably 90 degrees) between the vertical connecting member 24 and the horizontal connecting member 25. By adjusting the positions of both ends of the angle adjustment member 26 on the vertical connecting member 24 and the horizontal connecting member 25, the relative angle between the drive coil 32 and the handpan 4 can be adjusted, facilitating the drive coil 32 to better strike the sounding area 40 on the handpan 4.

[0058] Specifically, the driving element 3 further includes a driving housing 31, and the driving coil 32 is installed inside the driving housing 31. The vertical connecting member 24 includes a pair of vertical rods 241, the horizontal connecting member 25 includes a pair of horizontal rods 251, and the angle adjusting member 26 includes a pair of mounting rods 261. The mounting rods 261 are used to connect the vertical rods 241 and the horizontal rods 251. The driving housing 31 is installed on the pair of mounting rods 261.

[0059] Furthermore, a plurality of vertical strip-shaped holes 242 are arranged in an array on the vertical rod 241, and a vertical connecting block 243 is arranged on the vertical rod 241. The vertical connecting block 243 can be installed at different positions on the vertical rod 241 through the vertical strip-shaped holes 242. A plurality of horizontal strip-shaped holes 252 are arranged in an array on the horizontal rod 251, and a horizontal connecting block 253 is arranged on the horizontal rod 251. The horizontal connecting block 253 can be installed at different positions on the horizontal rod 251 through the horizontal strip-shaped holes 252. One side of the mounting rod 261 is connected to the horizontal connecting block 253, and the other side of the mounting rod 261 is connected to the vertical connecting block 243.

[0060] In a preferred embodiment, a plurality of connecting strip-shaped holes 262 for connecting with the driving housing 31 are arranged in an array on the mounting rod 261. By installing the driving housing 31 at different positions on the mounting rod 261, the distance between the driving coil 32 and the handpan 4 can be adjusted, thereby realizing the adjustment of the force of the driving coil 32 hitting the handpan 4.

[0061] The cross-sections of both the vertical connecting block 243 and the horizontal connecting block 253 are L-shaped. Setting the cross-sections of both the vertical connecting block 243 and the horizontal connecting block 253 to be L-shaped facilitates the connection between the mounting rod 261 and the vertical rod 241 and the horizontal rod 251. The disc 23 is located at the top of the handpan 4, and the driving coil 32 is arranged on the side of the disc 23 facing the handpan 4.

[0062] The handpan automatic playing device further includes a driving power supply. The pulse current emitting component includes a driving capacitor 33 and a MOS transistor. The driving power supply is used to charge the driving capacitor 33. The MOS transistor is arranged on the circuit connecting the driving capacitor 33 and the driving coil 32. The control end of the MOS transistor is connected to the controller, and the controller can control the on / off of the MOS transistor. Specifically, as Figure 4As shown in the figure, the reference numeral SW in the figure is a switch, the reference numeral L is the drive coil 32, and the capacitor in the figure is the drive capacitor 33. The switch SW can be set as a thyristor 34 or a MOS transistor. The drive power supply can be 220V alternating current, which is transformed and rectified by a rectifier bridge to be converted into direct current. The drive capacitor 33 is charged with the direct current. The drive capacitor 33 is connected to the drive coil 32 through the thyristor 34. The control port on the thyristor 34 or the MOS transistor is connected to a controller. By using the controller to control the on / off of the thyristor 34 or the MOS transistor, it is possible to use the controller to control the drive power supply to discharge the drive capacitor 33, thereby realizing the automatic performance of the handpan.

[0063] Finally, the present invention also provides a handpan automatic performance method based on multi-channel electromagnetic pulses, and the performance method is implemented based on the above-mentioned handpan automatic performance device.

[0064] The handpan automatic performance method includes:

[0065] Receiving a music score file, parsing the music score file and obtaining music score data, where the music score data includes note information arranged in sequence. The music score file can be a simplified music score picture containing the music score. Specifically, parsing the music score file and obtaining the music score data can be as follows: First, use image recognition technology to preprocess the simplified music score picture, accurately locate and remove text content such as the song name, key signature, song lyrics author, etc. to facilitate subsequent processing; then perform binarization processing, adapt the threshold to divide the pixel value categories to make the notes clearer and improve the recognition accuracy; then cut each note by virtue of computer vision algorithms, separate and arrange them into independent pictures according to features and positions, and also standardize their sizes and resolutions to ensure quality; then construct a convolutional neural network model, adjust the intercepted pixel values for different notes, and through multiple rounds of training, the recognition accuracy of notes and beats reaches 100%; finally, convert the extracted simplified music score notes and beat information into note information arranged in sequence, that is, the corresponding relationship between time and notes. Among them, eight notes correspond to eight drive coils 32, and the eight coils correspond to eight sound-producing areas on the handpan. The note information arranged in sequence determines the knocking order of the eight sound-producing areas on the handpan.

[0066] According to multiple pieces of note information arranged in sequence, control the corresponding pulse current emission component to discharge to the corresponding drive coil 32, thereby making the sound-producing area produce sound. Specifically, the controller determines the discharge order of the corresponding drive coil 32 according to the note information arranged in sequence (the eight sound-producing areas on the handpan correspond to eight drive coils 32 and the corresponding eight notes. Therefore, knowing the note information arranged in sequence, the discharge order of the eight coils is known). The controller sequentially controls the on / off of the corresponding MOS transistor or thyristor 34, so that the drive capacitor 33 can emit pulse current to the drive coil 32 to achieve the purpose of automatic performance.

[0067] This process can control parameters such as voltage magnitude, frequency, and waveform, and control the music loudness by adjusting the voltage magnitude. At the same time, the controller can also control the playing interval time between every two notes, thereby controlling the beats per minute of the music. The present invention sets the circuit signal in the form of a sine wave. The sine wave has the characteristics of stability and periodicity, and can provide a stable current signal for music performance. Its frequency is set to 10 Hz. At the level of the eight-channel excitation drive coil 32, each channel is independent and does not interfere with each other. Different channels can independently set parameters such as the capacitance of the drive capacitor 33, current magnitude, number of coil turns, and material in the channel. These parameters can affect the strength and duration of the electromagnetic pulse excitation, so as to achieve different excitation effects when each channel drives the corresponding sound area of the handpan to vibrate. When the system stops playing, turn off the chassis power supply and turn on the resistance switch, and the capacitor can quickly discharge and end the work.

[0068] In summary, the specific composition of the handpan automatic performance system of the present invention is as Figure 4 shown. The present invention realizes the conversion of the numbered musical notation into tabular data that can be read by the NI program through the machine learning of subsystem 1 for import into subsystem 2. Subsystem 2 can convert the tabular data into a current signal. Subsystem 3 converts the electrical signal in subsystem 2 into an optical signal through a drive board, and controls the charging and discharging of the channel capacitor by controlling the opening and closing of the thyristor in subsystem 3 through the signal. In subsystem 4, the coil generates a changing electromagnetic field through charging, so that the metal structure of the handpan in the corresponding channel vibrates and makes a sound under the action of a periodically changing force, realizing music performance.

[0069] Subsystem 1: Computer program

[0070] A computer program method based on Python machine learning that converts numbered musical notation into tabular data that can be read by the NI program. When the program operates, it first preprocesses the numbered musical notation picture using image recognition technology, accurately locates and removes text content such as song names, key signatures, songwriters, etc. to facilitate subsequent processing; then performs binarization processing, adapts the threshold to divide pixel value categories, makes the notes clearer, and improves the recognition accuracy; then cuts each note using computer vision algorithms, separates and arranges them into independent pictures according to features and positions, and also standardizes their sizes and resolutions to ensure quality; then constructs a convolutional neural network model with the MNIST handwritten digit library as the training set, adjusts the intercepted pixel values for different notes, and after multiple rounds of training, the recognition accuracy of notes and beats reaches 100%; finally, converts the extracted numbered musical notation note and beat information into a standardized and complete csv tabular data (where the csv tabular data is the musical score data) for the NI program to import.

[0071] Subsystem 2: Control signal generation circuit

[0072] The control signal generation circuit can convert the tabular data processed by the computer program into a specific current signal. Specifically, the NI program, as the core control unit, is responsible for importing the CSV data format file generated by subsystem 1. The NI program converts the data into sub-arrays, where different numbered musical notations in the sub-arrays correspond to different channels, and each channel is controlled separately through independent lines. When the numbers in the sub-array are read in sequence, pulsed currents are generated in the corresponding channels. This process can control parameters such as voltage magnitude, frequency, and waveform, and control the music loudness by adjusting the voltage magnitude. At the same time, the NI program can also control the playing interval time between every two notes, thereby controlling the beats per minute of the music. Finally, the multi-channel current signal generated by the NI program is transmitted to the drive board through the NI card slot. The NI card slot ensures accurate signal transmission and efficient conversion, providing stable and reliable current signal support for subsequent handpan playing. The process can be as Figure 5 shown.

[0073] Subsystem 3: Multi-channel excitation circuit

[0074] As the core component of the handpan automatic playing device, the multi-channel excitation circuit undertakes the important task of converting the current signal into an excitation signal that drives the handpan to vibrate. This device has eight independently operating channels with the same working principle, and the chassis power supply inputs current to charge the capacitors corresponding to the eight channels for energy storage. First, one of the channels will be described as an example. When this channel responds, the current signal generated by subsystem 2 is converted into an optical signal by the drive board in subsystem 3, and subsystem 3 and subsystem 4 are connected through an optical fiber. Subsequently, the capacitor discharge circuit starts to play a key role. At this time, the optical signal reaches the thyristor through the optical fiber, and the thyristor controls its opening and closing according to the intensity and frequency of the optical signal. When the thyristor closes, the charged capacitor and the coil form a closed loop and release pulsed current into the coil carried by the playing bracket in subsystem 4.

[0075] At the level of the multi-channel excitation circuit, each channel is independent and does not interfere with each other. After the pulsed signal of one channel causes the thyristor to close, there will quickly be a pulsed signal of another channel for the reset of the thyristor. These two pulsed signals together serve as the basic period of the system to play a note. Different channels can separately set parameters such as the capacitance of the capacitor, current magnitude, number of turns of the coil, and its material inside the channel. These parameters can affect the strength and duration of the electromagnetic pulse excitation, so as to achieve different excitation effects when each channel drives the corresponding sound area of the handpan to vibrate. When the system stops playing, turn off the chassis power supply and turn on the resistance switch, and the capacitor can quickly discharge to end the work.

[0076] In a specific embodiment, as Figure 5 shown, there are eight drive boards set in the controller in this application, each drive board is correspondingly connected to a corresponding drive capacitor 33, and one drive capacitor 33 corresponds to one drive coil 32( Figure 5Only the connection relationship between one driving coil 32 and the driving board is shown, and the connection relationships between the other seven driving coils 32 and the driving board are the same as the above, so they are omitted. And Figure 5 the rectifying circuit elements of the driving capacitor 33 are not shown). After the controller parses the music score file and obtains the music score data, according to the multiple note information arranged in sequence, the controller controls the corresponding driving board to send a control signal to the thyristor 34, and then controls the on / off of the corresponding thyristor 34, so that the corresponding driving capacitor 33 discharges to the driving coil 32, and then makes the sounding area sound. Specifically, the thyristor 34 is an optically controlled thyristor 34 or an opto-coupled thyristor 34. The controller emits a conduction electrical signal to the corresponding driving board according to the multiple note information arranged in sequence. The driving board converts the corresponding electrical signal into a conduction optical signal and transmits the conduction optical signal to the thyristor 34. After receiving the conduction optical signal, the thyristor 34 conducts, so that the corresponding driving capacitor 33 emits a pulsed current to the driving coil 32.

[0077] In this application, after the thyristor 34 conducts, in order to reset and turn off the thyristor 34, a turn-off electrical signal will be sent to the corresponding driving board after a set time after the controller sends the conduction electrical signal to the driving board. After receiving the turn-off electrical signal, the driving board converts the turn-off electrical signal into a turn-off optical signal and transmits the turn-off optical signal to the optoelectronic converter provided on the corresponding thyristor 34. The thyristor 34 receives the electrical signal converted by the optoelectronic converter to achieve reset turn-off. That is, in the specific embodiment of this application, the controller and each driving board can transmit conduction electrical signals and turn-off electrical signals. Two optical fibers are also provided between the driving board and the driving coil 32 (one is used to transmit the conduction optical signal, and the other is used to transmit the turn-off optical signal). Using optical signals to control the on / off of the thyristor 34 has strong anti-interference ability and can respond quickly.

[0078] In summary, this device is provided with eight driving coils 32, eight thyristors 34 and eight driving boards. One thyristor 34 can correspondingly control the energization and de-energization of one driving coil 32, and one driving board can correspondingly control the closing and opening of one thyristor 34. The eight coils can operate independently to track and realize the automatic performance of the handpan.

[0079] Subsystem 4: Music performance part

[0080] The music performance part, as the core link of the handpan automatic performance device, is the key to realizing music production. It is composed of a multi-channel electromagnetic pulse source and a handpan.

[0081] The multi-channel electromagnetic pulse source has eight drive coils mounted on the playing bracket. These drive coils are connected and controlled to subsystem 3 by sixteen optical fibers (each channel is connected between subsystem 3 and subsystem 4 by two optical fibers). The high-precision signal transmission ability of the optical fiber drive channels can precisely control the current state of the drive coils, thereby highly sensitively controlling the vibration of the handpan.

[0082] As a percussion instrument with a metal structure, the handpan has unique physical properties. It has eight sound-producing areas on its top, which correspond one-to-one with the eight channels of the present invention. Each sound-producing area has differences in parameters such as thickness and diameter. The thickness and diameter of the sound-producing area affect its vibration frequency and amplitude, and thus affect the timbre and pitch of the sound. When the sound-producing area vibrates, it causes the vibration of the surrounding air, and these vibrations interact with each other in space to form a reverberation effect. It is this reverberation that enables the handpan to produce rich, unique in timbre and long in sustain sounds.

[0083] During the music performance, the optical fiber transmission signal of subsystem 3 plays a key role. When there is a signal transmission in the optical fiber connected to this channel, the thyristor controlling this channel closes, and the drive capacitor switches from charging to discharging, releasing a pulsed current. This current is transmitted to the drive coil corresponding to the channel on the playing bracket of subsystem 4. After receiving the pulsed current, a changing electromagnetic field is generated around the drive coil. The intensity and direction of the magnetic field are closely related to the magnitude and change of the current. An induced electromotive force and current are generated in the handpan metal structure under the action of the changing electromagnetic field. Due to the continuously changing direction of the magnetic force, the handpan metal structure is subjected to a periodically changing force, and this periodically changing force prompts the sound-producing area of the handpan corresponding to the channel to vibrate and produce sound.

[0084] The working process of the entire system: The computer program of Subsystem 1 processes the numbered musical notation based on machine learning. First, it uses image recognition technology to remove text content such as song names, key signatures, songwriters, etc. from the numbered musical notation. Then, it performs binarization processing to make the musical notes clearer. Next, it uses computer vision algorithms to cut the musical notes and standardize their sizes and resolutions. After that, it constructs a convolutional neural network model with the MNIST handwritten digit database as the training set. Finally, it converts the extracted numbered musical notation notes and beat information into a standardized and complete csv table data and provides it to the NI program in the control signal generation circuit of Subsystem 2. The NI program converts the table data into sub-arrays. Different numbered musical notation digits correspond to different channels. When reading the digits in the sub-array in sequence, pulse currents will be generated in the corresponding channels. During this process, parameters such as voltage magnitude, frequency, and waveform can be controlled. Subsequently, the multi-channel current signal generated by the NI program is transmitted through the NI card slot to the driver board in the multi-channel excitation circuit of Subsystem 3 and converted into an optical signal. The driver board is connected to the drive coil mounted on the playing bracket in Subsystem 4 through an optical fiber. The thyristor controls the opening and closing of the circuit according to the intensity and frequency of the optical signal, determining the timing and magnitude of the charging and discharging current of the driving capacitor. When the thyristor in the channel closes, the driving capacitor discharges and releases a pulse current to the drive coil corresponding to the channel. The drive coil generates a changing electromagnetic field, causing an induced electromotive force and current in the metal structure of the corresponding sounding area of the handpan in Subsystem 4. The sounding area of the handpan in this channel is subjected to a periodically changing force, prompting the sounding area of the handpan corresponding to the channel to vibrate and produce sound, thus realizing the automatic playing of the handpan.

[0085] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and features of the present invention. Its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. A handpan automatic playing device based on multi-channel electromagnetic pulses, characterized in that: The automatic handpan playing device comprises: a tooling base plate (1), a playing support (2), a plurality of driving elements (3) and a controller; The tooling bottom plate (1) is provided with a tooling hole (10), the tooling bottom plate (1) is used to place a handpan (4), and one end of the handpan (4) is located in the tooling hole (10); The performance support (2) is arranged on the tooling bottom plate (1), and the handpan (4) is located inside the performance support (2); The driving element (3) is arranged on the performance support (2), and the driving element (3) comprises a pulse current emission component and a driving coil (32); The pulse current emission component is connected to the driving coil (32), and the pulse current emission component can provide a pulse current into the driving coil (32); The controller is connected to the pulse current emission component, and the controller can control the pulse current emission component to emit a pulse current to the drive coil (32); The driving coil (32) is arranged close to the sound producing area (40) of the handpan (4), and the sound producing area (40) of the handpan (4) can vibrate under the action of the driving coil (32).

2. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in claim 1, characterized in that: The performance support (2) comprises: a first circular ring (21), a second circular ring (22), a circular disc (23) and an angle adjustment member (26); The first circular ring (21) is arranged on the tooling base plate (1), and the hand disk (4) is located inside the first circular ring (21); The second circular ring (22) is located above the first circular ring (21), and a plurality of vertical connecting members (24) are provided between the first circular ring (21) and the second circular ring (22); The disc (23) and the second circular ring (22) are in the same horizontal plane, and the disc (23) is located inside the second circular ring (22), and a plurality of transverse connecting members (25) are provided between the second circular ring (22) and the disc (23); The transverse connecting member (25) corresponds to the vertical connecting member (24) one by one, one end of the angle adjusting member (26) is mounted on the transverse connecting member (25), the other end of the angle adjusting member (26) is mounted on the corresponding vertical connecting member (24), and the driving coil (32) is mounted on the angle adjusting member (26).

3. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in claim 2, characterized in that: The driving element (3) further comprises a driving housing (31), and the driving coil (32) is installed in the driving housing (31); The vertical connecting member (24) includes a pair of vertical rods (241), the transverse connecting member (25) includes a pair of transverse rods (251), and the angle adjusting member (26) includes a pair of mounting rods (261), wherein the mounting rods (261) are used to connect the vertical rods (241) and the transverse rods (251); The drive housing (31) is mounted on a pair of mounting rods (261).

4. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in claim 3, characterized in that: A plurality of vertical strip-shaped holes (242) are arranged in an array on the vertical rod (241), and a vertical connection block (243) is arranged on the vertical rod (241). The vertical connection block (243) can be installed at different positions on the vertical rod (241) through the vertical strip-shaped holes (242); The transverse rod (251) is provided with a plurality of transverse strip-shaped holes (252) in an array, and the transverse rod (251) is provided with a transverse connecting block (253), and the transverse connecting block (253) can be installed at different positions of the transverse rod (251) through the transverse strip-shaped holes (252); One side of the mounting rod (261) is connected to the transverse connection block (253), and the other side of the mounting rod (261) is connected to the vertical connection block (243).

5. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in claim 4, characterized in that: The mounting rod (261) is provided with a plurality of strip-shaped holes (262) in an array for connecting with the drive housing (31).

6. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in claim 4, characterized in that: The cross sections of the vertical connection block (243) and the horizontal connection block (253) are both L-shaped.

7. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in claim 2, characterized in that: The circular disk (23) is located on the top of the hand plate (4), and the driving coil (32) is arranged on a side of the circular disk (23) facing the hand plate (4).

8. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in any one of claims 1 to 7, characterized in that: The handpan automatic playing device also includes a driving power supply, and the pulse current emission component includes a driving capacitor (33) and a thyristor (34); The driving power supply is used to charge the driving capacitor (33); the thyristor (34) is arranged on a circuit connecting the driving capacitor (33) and the driving coil (32); a control end of the thyristor (34) is connected to the controller; and the controller is capable of controlling the on and off of the thyristor (34).

9. The automatic handpan playing device based on multi-channel electromagnetic pulses as claimed in any one of claims 1 to 7, characterized in that: The tooling bottom plate (1) is provided with a groove (11) for accommodating the performance support (2).

10. A handpan automatic playing method based on multi-channel electromagnetic pulses, the playing method is implemented based on the handpan automatic playing device according to any one of claims 1 to 7, characterized in that: The automatic handpan playing method comprises: Receiving a music score file, parsing the music score file and obtaining music score data, wherein the music score data includes a plurality of note information arranged in sequence; According to the plurality of note information arranged in sequence, the corresponding pulse current emission component is controlled to discharge to the corresponding driving coil (32) so as to make the sound producing area (40) produce sound.

Images