Fingerboard and stringless guitar

Abstract

The application discloses a fretboard and a stringless guitar. The fretboard comprises a body, a pressure-sensitive button, a sampling circuit and a microcontroller. The pressure-sensitive button is arranged on the body and is configured to have a resistance decreasing with an increase of pressing force of a user. The sampling circuit is connected with the pressure-sensitive button and is configured to collect a resistance value of the resistance of the pressure-sensitive button. The microcontroller is connected with the sampling circuit and is configured to control a volume of the stringless guitar according to the resistance value. The fretboard provided by the application can sense the pressing force of the user by using the pressure-sensitive button, and can reflect the change of the pressing force of the user by measuring the voltage of the sampling resistance, so as to control the volume of the guitar according to the voltage, so that the volume of the stringless guitar can be dynamically controlled, the traditional guitar can be more realistically simulated, and more playing requirements can be met.

Description

Technical Field

[0001] This application relates to the field of electronic musical instrument technology, and more specifically, to a fingerboard and a stringless guitar. Background Technology

[0002] A stringless guitar is a type of guitar that produces sound without traditional strings. Users can create different chords by pressing different positions on the fretboard. However, in this technology, the volume of a stringless guitar needs to be controlled individually. Therefore, unlike a traditional guitar, the volume cannot be dynamically controlled by adjusting the force of plucking the strings, thus limiting its ability to meet a wider range of performance needs. Utility Model Content

[0003] This application provides a fingerboard and a stringless guitar to solve at least one of the aforementioned technical problems.

[0004] The fingerboard of this application embodiment, used for a stringless guitar, includes:

[0005] ontology;

[0006] A pressure-sensitive button is disposed on the body, and the pressure-sensitive button is configured such that its resistance decreases as the user presses the button harder.

[0007] A sampling circuit is connected to the pressure-sensitive button and configured to acquire the resistance value of the pressure-sensitive button.

[0008] A microcontroller is connected to the sampling circuit, and the microcontroller controls the volume of the stringless guitar according to the resistance value.

[0009] The fingerboard provided in this application uses pressure-sensitive buttons to sense the pressure applied by the user and measures the voltage drop across the sampling resistor to reflect changes in the pressure applied by the user. The volume of the guitar is controlled based on the magnitude of the voltage drop, enabling dynamic control of the volume of a stringless guitar. This more realistically simulates a traditional guitar and meets a wider range of performance needs.

[0010] In some embodiments, the pressure-sensitive button includes a circuit board and an elastic diaphragm. The circuit board is provided with a plurality of first connecting pieces and a plurality of second connecting pieces, which are alternately spaced apart. The elastic diaphragm is provided corresponding to the first connecting pieces and the plurality of second connecting pieces and is spaced apart from the circuit board. The elastic diaphragm is configured such that when a user presses the elastic diaphragm, the first connecting pieces and the second connecting pieces become conductive, and as the force of the user pressing the elastic diaphragm increases, the number of first connecting pieces and the second connecting pieces that become conductive increases, thereby reducing the resistance of the pressure-sensitive button.

[0011] Thus, purely mechanical pressure-sensitive buttons help reduce production costs.

[0012] In some embodiments, the body is provided with multiple button areas, and each button area is provided with at least one pressure-sensitive button; the multiple button areas include a first button area and a second button area, both the first button area and the second button area include multiple large button combinations and multiple small button combinations, each of the large button combinations and the small button combinations includes multiple pressure-sensitive buttons, the large button combinations and the small button combinations in the first button area are arranged alternately, and the large button combinations and the small button combinations in the second button area are arranged alternately.

[0013] Thus, setting up multiple key areas allows the stringless guitar to achieve more functions; the alternating arrangement of large and small key combinations makes it easier for users to accurately identify and press the required keys.

[0014] In some embodiments, each major key combination includes 2-3 major keys, and each minor key combination includes 2-3 minor keys.

[0015] In this way, setting up multiple large and small keys for each large and small key combination is beneficial for expanding the number of keys and providing more functions.

[0016] In some embodiments, the plurality of button areas further include a third button area and a fourth button area, wherein the fourth button area includes a plurality of arpeggio button areas.

[0017] Thus, the arpeggio keys in the third and fourth button areas allow for more varied arrangements of the multiple button areas, meeting the needs of more users.

[0018] In some embodiments, the sampling circuit further includes a sampling resistor and an analog switch. The sampling resistor is connected in series with the pressure-sensitive button. The sampling circuit is connected to the microcontroller through the analog switch. The analog switch is connected between the sampling resistor and the pressure-sensitive button to acquire the voltage drop across the sampling resistor. The microcontroller controls the volume of the stringless guitar based on the magnitude of the voltage drop.

[0019] Therefore, instead of directly sampling the resistance value of the pressure-sensitive button, sampling the voltage divider of the sampling resistor helps to reduce the difficulty of controlling the volume of a stringless guitar.

[0020] In some embodiments, there are multiple analog switches, and each analog switch is connected to multiple sampling circuits.

[0021] Therefore, compared to using a single analog switch to connect the entire sampling circuit, using multiple analog switches with smaller channels helps reduce costs and maintenance costs.

[0022] In some embodiments, the sampling circuit further includes a protection resistor connected in series with the pressure-sensitive button and the sampling resistor.

[0023] Thus, setting a protective resistor can divide the voltage and limit the current, thereby protecting other components in the circuit and ensuring the safe, stable and reliable operation of the circuit.

[0024] In some embodiments, the resistance value of the pressure-sensitive button is in the range of 200 to 1000 Ω.

[0025] In this way, while ensuring that the pressure-sensitive button has a sufficient adjustment range, it can also prevent the pressure-sensitive button from having too small a resistance value, which would lead to excessive current and damage the analog switch.

[0026] Another embodiment of the stringless guitar of this application includes the fretboard described in any of the above claims.

[0027] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the finger plate according to an embodiment of this application;

[0030] Figure 2 This is a circuit diagram of the microcontroller of the fingerboard according to an embodiment of this application;

[0031] Figure 3 This is a cross-sectional view of the pressure-sensitive button on the finger plate according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the circuit board structure of the finger plate according to an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the structure of the main body of the finger plate according to an embodiment of this application;

[0034] Figure 6 This is a circuit diagram of the sampling circuit of the finger plate according to an embodiment of this application;

[0035] Figure 7 This is a circuit diagram of the analog switch of the fingerboard according to an embodiment of this application.

[0036] Key component symbols: Finger plate 100, Body 10, First button area 11, Large button combination 111, First button 1111, Second button 1112, Small button combination 112, Second button area 12, Third button area 13, Fourth button area 14, Pressure-sensitive button 20, Circuit board 21, First connecting piece 211, Second connecting piece 212, Elastic diaphragm 22, Sampling circuit 30, Sampling resistor 31, Analog switch 32, Power supply terminal 33, Grounding terminal 34, Protection resistor 35, Filter capacitor 36, Microcontroller 40. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] This disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] A stringless guitar is a type of guitar that produces sound without traditional strings. Users can create different chords by pressing different positions on the fretboard. However, in this technology, the volume of a stringless guitar needs to be controlled individually. Therefore, unlike a traditional guitar, the volume cannot be dynamically controlled by adjusting the force of plucking the strings, thus limiting its ability to meet a wider range of performance needs.

[0042] Please see Figure 1 This application provides a stringless guitar, including a fretboard 100. The fretboard 100 includes a body 10, a pressure-sensitive button 20, a sampling circuit 30, and a microcontroller 40. The pressure-sensitive button 20 is disposed on the body 10 and is configured such that its resistance decreases as the user presses the button. The sampling circuit 30 is connected to the pressure-sensitive button 20 and is configured to collect the resistance value of the pressure-sensitive button 20. The microcontroller 40 is connected to the sampling circuit 30 and controls the volume of the stringless guitar according to the resistance value.

[0043] The fretboard 100 provided in this application uses pressure-sensitive button 20 to sense the pressure applied by the user, and measures the voltage divider of sampling resistor 31 to reflect the change in the pressure applied by the user. The volume of the guitar is controlled according to the magnitude of the voltage divider, so as to realize dynamic control of the volume of the stringless guitar, more realistically simulate the traditional guitar, and meet more performance needs.

[0044] Specifically, in this embodiment, the stringless guitar is the same as a traditional guitar, typically including a connected body and neck. The fingerboard 100 is located on the neck, the pressure-sensitive button 20 is located on the body 10 of the fingerboard 100, and the sampling circuit 30 and the microcontroller 40 are also located on the body 10.

[0045] In some embodiments, the sampling circuit 30 and the microcontroller 40 may also be located inside the neck.

[0046] Furthermore, there are multiple pressure-sensitive buttons 20, which are spaced apart on the fingerboard 100 along the length of the neck.

[0047] Please refer to Figure 2 The microcontroller 40 is a highly integrated microcomputer system. The microcontroller 40 integrates a processor core, memory, input / output interfaces, and possibly other peripheral devices (such as timers, analog-to-digital converters, etc.) onto a single integrated circuit chip. This highly integrated design makes the microcontroller 40 small in size, low in power consumption, and highly efficient. In this embodiment, the microcontroller 40 is used to control the volume of a stringless guitar based on the resistance value of the varistor provided by the sampling circuit 30.

[0048] Please see Figure 3 and Figure 4 In some embodiments, the pressure-sensitive button 20 includes a circuit board 21 and an elastic diaphragm 22. The circuit board 21 is provided with a plurality of first connecting pieces 211 and a plurality of second connecting pieces 212, which are alternately spaced. The elastic diaphragm 22 is provided corresponding to the first connecting pieces 211 and the plurality of second connecting pieces 212 and is spaced apart from the circuit board 21. The elastic diaphragm 22 is configured such that when a user presses the elastic diaphragm 22, the first connecting pieces 211 and the second connecting pieces 212 become conductive. As the force of the user pressing the elastic diaphragm 22 increases, the number of first connecting pieces 211 and the second connecting pieces 212 that are conductive increases, thereby reducing the resistance of the pressure-sensitive button 20.

[0049] Thus, the purely mechanical pressure-sensitive button 20 helps reduce production costs.

[0050] Specifically, in this embodiment, the circuit board 21 is disposed on the body 10 of the finger plate 100. Each pressure-sensitive button 20 includes a plurality of first connecting pieces 211 and a plurality of second connecting pieces 212. The plurality of first connecting pieces 211 are connected at one end and arranged in a comb-like interval at the other end. The plurality of second connecting pieces 212 are also connected at one end and arranged in a comb-like interval at the other end. Each second connecting piece 212 is at least partially disposed at the interval between two adjacent first connecting pieces 211, and the second connecting piece 212 is also arranged at a distance from the two adjacent first connecting pieces 211.

[0051] Furthermore, the elastic diaphragm 22 is disposed on the circuit board 21 and spaced apart from the circuit board 21. In this embodiment, the elastic diaphragm 22 is made of an elastic conductor material. When the elastic diaphragm 22 is pressed, the pressed part of the elastic diaphragm 22 will deform and stick to the circuit board 21, and conduct the first connecting piece 211 and the second connecting piece 212 of the pressure-sensitive button 20, thereby making the pressure-sensitive button 20 conductive. As the force of the user pressing the elastic diaphragm 22 increases, the area of ​​the elastic diaphragm 22 that is pressed and deformed also increases, resulting in an increase in the number of connected first connecting pieces 211 and second connecting pieces 212. Since the resistance of each first connecting piece 211 and second connecting piece 212 is fixed, the conduction of multiple first connecting pieces 211 and multiple second connecting pieces 212 is equivalent to multiple sets of first connecting pieces 211 and second connecting pieces 212 connected in parallel. Therefore, the greater the force of pressing the elastic diaphragm 22, the smaller the resistance of the pressure-sensitive button 20.

[0052] Furthermore, multiple pressure-sensitive buttons 20 can use the same circuit board 21. That is, the first connecting piece 211 and the second connecting piece 212 of multiple pressure-sensitive buttons 20 can be set in different areas of the same circuit board 21. Similarly, multiple pressure-sensitive buttons 20 can use the same elastic diaphragm 22. That is, the first connecting piece 211 and the second connecting piece 212 of multiple pressure-sensitive buttons 20 can be set in different areas of the same elastic diaphragm 22.

[0053] In some embodiments, the elastic diaphragm 22 may not be made entirely of a conductive material; the elastic diaphragm 22 may be made of a conductor only in the area corresponding to the pressure-sensitive button 20.

[0054] Please refer to Figure 5 In some embodiments, the body 10 is provided with multiple button areas, and each button area is provided with at least one pressure-sensitive button 20.

[0055] Therefore, having multiple button areas allows the stringless guitar to perform more functions.

[0056] Specifically, in this embodiment, the main body 10 is provided with four button areas, each button area is provided with a number of pressure-sensitive buttons 20, and all pressure-sensitive buttons 20 located in the same area share the same circuit board 21.

[0057] In some embodiments, the multiple button areas include a first button area 11 and a second button area 12. Both the first button area 11 and the second button area 12 include multiple large key combinations 111 and multiple small key combinations 112. Both the large key combinations 111 and the small key combinations 112 include multiple pressure-sensitive buttons 20. The large key combinations 111 and the small key combinations 112 in the first button area 11 are arranged alternately, and the large key combinations 111 and the small key combinations 112 in the second button area 12 are arranged alternately.

[0058] In this way, the large key combination 111 and the small key combination 112 are alternately arranged, making it easier for users to more accurately identify and press the required keys.

[0059] Specifically, the first button area 11 includes three large button combinations 111 and two small button combinations 112. The three large button combinations 111 and the two small button combinations 112 are arranged alternately, and the two small button combinations 112 have equal or similar areas.

[0060] The second button area 12 includes four large button combinations 111 and three small button combinations 112. The four large button combinations 111 and the three small button combinations 112 are arranged alternately, and the areas of the small button combinations 112 are equal or close.

[0061] In some embodiments, each large key combination 111 may include 2-3 large keys, and each small key combination 112 may also include 2-3 small keys. It should be noted that the large keys and small keys are pressure-sensitive buttons 20 with different functions. The size is only a distinction in name and does not mean that the size of the large key is necessarily larger than that of the small key.

[0062] Furthermore, each major key combination 111 and minor key combination 112 includes a first key 1111 with the largest area and two second keys 1112 with equal areas. The area of ​​the first key 1111 in all major key combinations can be equal or gradually increase from left to right, and the area of ​​the second key 1112 can be equal or gradually increase from left to right. The same applies to all minor key combinations 112.

[0063] In some embodiments, the multiple button areas also include a third button area 13 and a fourth button area 14, wherein the fourth button area 14 may include multiple arpeggio keys, and the positions of the third button area 13 and the fourth button area 14 may be interchanged.

[0064] In this way, the positions of the third button area 13 and the fourth button area 14 can be interchanged, which facilitates more ways of arranging multiple button areas and meets the needs of more users.

[0065] Specifically, in this embodiment, the third button area 13 and the fourth button area 14 are typically functional areas. The third button area 13 has only one key, and its key area is greater than or equal to the total area of ​​a large key combination 111. The fourth button area 14 may include six arpeggio keys, each with an equal area. The positions of the third button area 13 and the fourth button area 14 can be interchanged.

[0066] Please see Figure 1 and 6 In some embodiments, the sampling circuit 30 further includes a sampling resistor 31 and an analog switch 32. The sampling resistor 31 is connected in series with the pressure-sensitive button 20. The sampling circuit 30 is connected to the microcontroller 40 through the analog switch 32. The analog switch 32 is connected between the sampling resistor 31 and the pressure-sensitive button 20 to collect the voltage division voltage of the sampling resistor 31. The microcontroller 40 controls the volume of the stringless guitar according to the magnitude of the voltage division voltage.

[0067] In this way, instead of directly sampling the resistance value of the pressure-sensitive button 20, the voltage divider of the sampling resistor 31 is used to reduce the difficulty of controlling the volume of the stringless guitar.

[0068] Specifically, the analog switch 32 mainly utilizes the characteristics of analog devices (such as JFETs or MOS) to switch the control signal path, primarily used to complete the switching function of connecting or disconnecting signal links. It is typically composed of semiconductor devices such as MOSFETs or bidirectional diodes, capable of performing tasks such as switching, selecting, and processing analog signals.

[0069] In this embodiment, the sampling circuit 30 further includes a power supply terminal 33 and a ground terminal 34. The power supply terminal 33 is connected to the sampling resistor 31, the other end of the sampling resistor 31 is connected to the pressure-sensitive button 20, and the other end of the pressure-sensitive button 20 is grounded. One channel of the analog switch 32 is connected between the sampling resistor 31 and the pressure-sensitive button 20 to acquire the voltage divider voltage of the sampling resistor 31. The microcontroller 40 controls the volume of the stringless guitar according to the magnitude of the voltage divider voltage.

[0070] Furthermore, the voltage divider voltage of sampling resistor 31 is:

[0071]

[0072] Among them, V out V is the voltage divided by the sampling resistor 31. oc R1 is the input voltage of power supply terminal 33, R2 is the fixed resistor of sampling circuit 30, and R2 is the resistance of pressure-sensitive button 20 that changes with pressure.

[0073] As can be seen from the above calculation formula, as the resistance of the pressure-sensitive button 20 increases, the voltage divided by the sampling resistor 31 will also increase. In this embodiment, when the voltage divided by the sampling resistor 31 increases, the volume of the stringless guitar will also increase. That is, the greater the force of the user's press, the greater the volume of the stringless guitar.

[0074] Please see Figure 6 In some embodiments, the sampling circuit 30 further includes a protection resistor 35, which is connected in series with the pressure-sensitive button 20 and the sampling resistor 31.

[0075] Thus, setting a protective resistor of 35 can divide the voltage and limit the current, thereby protecting other components in the circuit and ensuring the safe, stable and reliable operation of the circuit.

[0076] Specifically, in this embodiment, the protection resistor 35 is connected between the pressure-sensitive button and the ground terminal 34. The main function of the protection resistor 35 in the circuit is to protect other components from damage caused by excessive voltage or current. Specifically, when the power supply terminal 33 is too high, the protection resistor 35, connected in series in the circuit, can share part of the voltage, thereby preventing other components from being damaged due to excessive voltage. When the current in the circuit is too large, the protection resistor 35 can limit the magnitude of the current to protect the sampling circuit 30 from damage.

[0077] It is important to note that the resistance value of the protection resistor 35 needs to be selected based on the specific circuit requirements to ensure it can effectively perform its voltage division or current limiting function. A resistance value that is too high or too low may affect the normal operation of the circuit. Furthermore, the protection resistor 35 consumes a certain amount of power during operation, so a resistor capable of handling this power must be selected to prevent damage due to overheating.

[0078] In some embodiments, the sampling circuit 30 further includes a filter capacitor 36 connected in parallel across the protection resistor 35.

[0079] Therefore, setting the filter capacitor to 36 helps reduce noise.

[0080] Specifically, the filter capacitor 36 has a higher impedance to high-frequency signals and a lower impedance to low-frequency signals. Therefore, when the user accidentally touches the pressure-sensitive button 20 on the fingerboard 100, the high-frequency signal generated will be attenuated, while the low-frequency signal from normal playing can pass through smoothly, thus achieving a filtering effect.

[0081] It is important to note that the capacitance value of the filter capacitor 36 must be selected appropriately, as the capacitance value directly affects the filtering effect. A larger capacitance value results in better filtering, but it also increases the size and cost of the circuit. Therefore, when selecting the filter capacitor 36, the appropriate capacitance value must be chosen based on the specific circuit requirements and the desired filtering effect.

[0082] Please see Figure 6 and Figure 7 In some embodiments, there are multiple analog switches 32, and each analog switch 32 is connected to multiple sampling circuits 30.

[0083] Therefore, compared to using a single analog switch 32 to connect all the sampling circuits 30, using multiple smaller channels of analog switches 32 is beneficial for reducing costs and maintenance costs.

[0084] Specifically, in this embodiment, 43 pressure-sensitive buttons 20 are required, that is, the analog switch 32 is connected to 43 sampling circuits 30.

[0085] Furthermore, in this embodiment, there are three analog switches 32, which are connected to the microcontroller 40 via ADC0, ADC1, and ADC2 paths, respectively. Each of the three analog switches 32 is a 16-channel switch, with the 16 channels of each switch numbered KEY_0 to KEY_15. 43 sampling circuits 30 are evenly connected to the three analog switches 32, with each sampling circuit 30 connected to at most one channel of the analog switch 32. For example, ... Figure 5 The sampling circuit 30 shown has a branch at KEY_0 that is conveniently connected to the KEY_1 path of one of the analog switches 32.

[0086] In other embodiments, other numbers of analog switches 32 and other numbers of channels of analog switches 32 may also be selected. The specific number of analog switches 32 and the number of channels of analog switches 32 can be selected according to actual needs, which will not be elaborated here.

[0087] In some embodiments, the microcontroller 40 is provided with a key-value polling scanning program, which can be used to determine whether the pressure-sensitive buttons 20 of each sampling circuit 30 are connected.

[0088] In this way, by using key value polling to scan the signals of all pressure-sensitive buttons, it is beneficial to ensure that all pressure-sensitive buttons can be correctly identified by the microcontroller 40, without causing signal conflicts due to multiple pressure-sensitive buttons being pressed in combination.

[0089] Specifically, key-value polling scanning is a commonly used keyboard input detection technique that continuously checks the state of each key on the keyboard to determine if a key has been pressed and obtains the corresponding key value. The steps of key-value polling scanning include: initializing the keyboard interface, polling scanning, debouncing, key value acquisition and processing, and key release detection.

[0090] It's important to note that the debouncing time should be adjusted based on the specific key characteristics and application scenario. Additionally, the impact of keyboard scanning on power supply needs to be considered; timed wake-up or interrupt triggering can be used to reduce unnecessary scanning operations.

[0091] Furthermore, the microcontroller 40 can perform multiple samplings through key-value polling and improve signal stability through a mean filtering algorithm. Specifically, the mean filtering algorithm is a typical linear filtering algorithm, also known as linear filtering. Its main method is the neighborhood averaging method, which involves selecting a template (composed of several of its nearest neighbors) for the current pixel to be processed, calculating the mean of all pixels in the template, and then assigning this mean to the current pixel as the grayscale value of that point in the processed image.

[0092] In other embodiments, the key-value polling scan, multiple sampling, and mean filtering algorithms can be implemented entirely or partially through software, hardware, firmware, or any other combination. When implemented in software, it can be implemented entirely or partially as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0093] In some embodiments, the resistance value of the pressure-sensitive button 20 is in the range of 200 to 1000 Ω.

[0094] In this way, while ensuring that the pressure-sensitive button 20 has a sufficient adjustment range, it can also prevent the pressure-sensitive button 20 from having too small a resistance value, which would lead to excessive current and thus damage the analog switch 32.

[0095] Specifically, the pressure-sensitive button 20 should be selected with an appropriate resistance value range to ensure that the force sensing range matches the ADC resolution. In this embodiment, the resistance value range of the pressure-sensitive button 20 is 200 to 1000 Ω.

[0096] In other embodiments, the resistance value of the pressure-sensitive button 20 can also be selected from other ranges, which can be selected according to actual needs, and will not be elaborated on here.

[0097] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0099] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A fingerboard for a stringless guitar, characterized in that, include: ontology; A pressure-sensitive button is disposed on the body, and the pressure-sensitive button is configured such that its resistance decreases as the user presses the button harder. A sampling circuit is connected to the pressure-sensitive button and configured to acquire the resistance value of the pressure-sensitive button. A microcontroller is connected to the sampling circuit, and the microcontroller controls the volume of the stringless guitar according to the resistance value.

2. The finger plate according to claim 1, characterized in that, The pressure-sensitive button includes a circuit board and an elastic diaphragm. The circuit board has a plurality of first connecting pieces and a plurality of second connecting pieces, which are alternately spaced. The elastic diaphragm is positioned corresponding to the first connecting pieces and the plurality of second connecting pieces and is spaced apart from the circuit board. The elastic diaphragm is configured such that when a user presses the elastic diaphragm, the first connecting pieces and the second connecting pieces become conductive. As the user presses the elastic diaphragm with increasing force, the number of first connecting pieces and the second connecting pieces that become conductive increases, thereby reducing the resistance of the pressure-sensitive button.

3. The finger plate according to claim 1, characterized in that, The main body is provided with multiple button areas, and each button area is provided with at least one pressure-sensitive button; the multiple button areas include a first button area and a second button area, both the first button area and the second button area include multiple large button combinations and multiple small button combinations, each of the large button combinations and the small button combinations includes multiple pressure-sensitive buttons, the large button combinations and small button combinations in the first button area are arranged alternately, and the large button combinations and small button combinations in the second button area are arranged alternately.

4. The finger plate according to claim 3, characterized in that, Each of the major key combinations includes 2-3 major keys, and each of the minor key combinations includes 2-3 minor keys.

5. The finger plate according to claim 3, characterized in that, The multiple button areas also include a third button area and a fourth button area, wherein the fourth button area includes multiple arpeggio keys.

6. The finger plate according to claim 1, characterized in that, The sampling circuit also includes a sampling resistor and an analog switch. The sampling resistor is connected in series with the pressure-sensitive button. The sampling circuit is connected to the microcontroller through the analog switch. The analog switch is connected between the sampling resistor and the pressure-sensitive button to acquire the voltage drop across the sampling resistor. The microcontroller controls the volume of the stringless guitar based on the magnitude of the voltage drop.

7. The finger plate according to claim 6, characterized in that, The number of analog switches is multiple, and each analog switch is connected to multiple sampling circuits.

8. The finger plate according to claim 6, characterized in that, The sampling circuit also includes a protection resistor, which is connected in series with the pressure-sensitive button and the sampling resistor.

9. The finger plate according to claim 1, characterized in that, The resistance value of the pressure-sensitive button ranges from 200 to 1000 Ω.

10. A stringless guitar, characterized in that, Includes the fingerboard as described in any one of claims 1-9.

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