阅读说明：本技术 一种键盘乐器数字化输入系统 (Keyboard musical instrument digital input system ) 是由 徐璟 宋晓勇 于 2021-08-19 设计创作，主要内容包括：本申请涉及一种键盘乐器数字化输入系统,其包括琴架和设在琴架上的黑键和白键,黑键的上表面设有黑键手指施压区,白键的上表面设有白键手指施压区,黑键和白键的下表面设有磁力发生器,琴架位于磁力发生器的下设有传感器采集板,传感器采集板面向磁力发生器的一侧设置有与磁力发生器一一对应的磁力传感器,磁力传感器与传感器采集板电连接,琴架上设有主控制板,主控制板与传感器采集板电连接,主控制板与后端设备电连接。本系统将极大提高磁力发生器移动到磁力传感器位置的精准度,从而可以有效提高磁力发生器运动速度的测量精度,进而提高本系统中,琴键按下时按键力度的测量精度,即对应琴键按下时钢琴发声的响度的测量精度。(The utility model relates to a keyboard instrument digital input system, it includes the musical instrument frame and establishes black key and white key on the musical instrument frame, the upper surface of black key is equipped with black key finger and applies the nip, the upper surface of white key is equipped with white key finger and applies the nip, the lower surface of black key and white key is equipped with the magnetic force generator, the musical instrument frame is located having the sensor acquisition board of magnetic force generator, one side that the sensor acquisition board was provided with to the magnetic force generator is provided with the magnetic force sensor with the magnetic force generator one-to-one, magnetic force sensor is connected with sensor acquisition board electricity, be equipped with the main control board on the musical instrument frame, the main control board is connected with sensor acquisition board electricity, the main control board is connected with rear end equipment electricity. This system will greatly improve the magnetic force generator and remove the precision to the magnetic force sensor position to can effectively improve the measurement accuracy of magnetic force generator velocity of motion, and then improve this system, the measurement accuracy of button dynamics when the key is pressed, the measurement accuracy of the loudness of piano sound production when corresponding the key promptly and pressing down.)

1. A keyboard musical instrument digital input system comprising a frame (10) and black keys (11) and white keys (12) provided on the frame (10), the upper surfaces of the black keys (11) being provided with black key finger pressing areas (111), and the upper surfaces of the white keys (12) being provided with white key finger pressing areas (121), characterized in that: the lower surface of black key (11) and white key (12) is equipped with magnetic force generator (2), is located magnetic force generator (2) on black key (11) is close to the back setting in black key finger pressure application district (111), is located magnetic force generator (2) on white key (12) is close to the back setting in white key finger pressure application district (121), bearing board (3) are installed to the below that musical instrument frame (10) is located magnetic force generator (2), sensor acquisition board (4) is installed to one side that bearing board (3) deviate from musical instrument frame (10), sensor acquisition board (4) are provided with magnetic force sensor (5) with magnetic force generator (2) one-to-one towards one side of magnetic force generator (2), magnetic force sensor (5) are connected with sensor acquisition board (4) electricity, be equipped with main control board (6) on musical instrument frame (10), main control board (6) is connected with sensor acquisition board (4) electricity, the main control board (6) is electrically connected with the rear-end equipment.

2. The keyboard musical instrument digital input system according to claim 1, wherein: the magnetic sensors (5) are positioned on the same sensor acquisition board (4), and the magnetic sensors (5) are arranged in a staggered mode.

3. The keyboard musical instrument digital input system according to claim 1, wherein: the magnetic force sensor (5) corresponding to the magnetic force generator (2) on the black key (11) is located on one sensor collecting plate (4), and the magnetic force sensor (5) corresponding to the magnetic force generator (2) on the white key (12) is located on the other sensor collecting plate (4).

4. The keyboard musical instrument digital input system according to claim 1, wherein: the upper surface of the piano frame (10) is provided with a black key flat pin (112) connected with a black key (11) and a white key flat pin (122) connected with a white key (12), the distance from a magnetic force generator (2) on the black key (11) to the center point of the black key flat pin (112) is L1, L1 is 60mm-62mm, the distance from the magnetic force generator (2) on the white key (12) to the center point of the white key flat pin (122) is L2, and L2 is 80mm-82 mm.

5. The keyboard musical instrument digital input system according to claim 4, wherein: the L1 is 60mm, and the L2 is 80 mm.

6. The keyboard musical instrument digital input system according to claim 1, wherein: the magnetic force generator (2) is adhered to the lower surface of the black key (11) or the white key (12) by an adhesive member.

7. The keyboard musical instrument digital input system according to claim 1, wherein: a threaded column (72) is fixed on one side face of the magnetic force generator (2), and the threaded column (72) is in threaded connection with the bottom of the black key (11) or the white key (12).

8. The keyboard musical instrument digital input system according to claim 1, wherein: the lower surface of black key (11) or white key (12) is detachable installs fixing base (73), magnetic force generator (2) is detachable installs in fixing base (73).

9. The keyboard musical instrument digital input system according to claim 1, wherein: the main control board (6) is electrically connected with the rear-end equipment through a peripheral interface, and the peripheral interface is a standard MIDI interface, a USB interface or a Bluetooth interface.

10. A loudness judging method based on a keyboard musical instrument digitalized input system, which adopts a keyboard musical instrument digitalized input system according to any one of claims 1-9, characterized by comprising the steps of:

s1, calculating the relative position relation between the magnetic force sensor (5) and the magnetic force generator (2) according to the magnetic induction intensity measured by the magnetic force sensor (5) arranged on the key corresponding position acquisition sensor acquisition board (4) for any black key (11) or white key (12) on the piano;

s2, continuously sampling the magnetic induction B measured on each magnetic sensor (5) by the main control board (6) according to a specific sampling rate;

s3, when the distance D between a certain key and the magnetic sensor (5) reaches a threshold value D1, recording the time T1;

s4, when the distance D between a certain key and the magnetic sensor (5) reaches a threshold value D2, recording the time T2;

s5, converting corresponding force data according to the result of V = (D2-D1)/(T2-T1), and coding and sending MIDI data by combining the serial number of the pressed key;

and S6, when the distance D between a certain key and the magnetic force sensor (5) reaches a threshold value D3, the key is considered to be released, and corresponding MIDI data is coded and transmitted.

Technical Field

The application relates to the field of musical instrument equipment, in particular to a keyboard musical instrument digital input system.

Background

The sounding principle of the traditional piano is that the piano produces sound through physical knocking, so that the traditional piano has the great advantage that different timbres can be played through different knocking strengths, and beautiful music can be created. The sounding principle of the electronic organ is that keys are used as control switches, sound is synthesized by various audio chips, and music is played and played through a loudspeaker unit.

The traditional piano has the advantages that the traditional piano has fixed tone and single function, sound cannot be eliminated during playing, people are easy to disturb people, and the advantage of the electronic organ can complement the disadvantage of the traditional piano, so that the advantage of the electronic organ is endowed to the traditional piano, and the electronic organ has great research significance.

Disclosure of Invention

To help improve the functionality of a conventional piano, the present application provides a keyboard musical instrument digitizing input system.

The application provides a keyboard instrument digital input system adopts following technical scheme:

in a first aspect, the keyboard musical instrument digital input system comprises a musical instrument frame, a black key and a white key which are arranged on the musical instrument frame, wherein a black key finger pressing area is arranged on the upper surface of the black key, a white key finger pressing area is arranged on the upper surface of the white key, magnetic force generators are arranged on the lower surfaces of the black key and the white key, the magnetic force generators on the black key are arranged close to the back surface of the black key finger pressing area, the magnetic force generators on the white key are arranged close to the back surface of the white key finger pressing area, a supporting plate is arranged below the magnetic force generators on the musical instrument frame, a sensor acquisition plate is arranged on one side of the supporting plate, which is far away from the musical instrument frame, magnetic force sensors which are in one-to-one correspondence with the magnetic force generators are arranged on one side, of the sensor acquisition plate, the magnetic force sensors are electrically connected with the sensor acquisition plate, and a main control plate is arranged on the musical instrument frame, the main control panel is electrically connected with the sensor acquisition board and is electrically connected with the rear-end equipment.

Through adopting above-mentioned technical scheme, when magnetic force generator and magnetic force sensor's position takes place relative change, magnetic force sensor can detect near magnetic induction intensity change numerical value, and magnetic force sensor can feed back the numerical value that records to sensor acquisition board to finally feed back rear end equipment, judge the state of key and feed back corresponding loudness through the numerical value that records, realize that mechanical action converts digital signal's process into. The advantage of this scheme lies in, the magnetic force generator staggered arrangement of the magnetic force generator of black key department and white key department, and all be close to the back in respective finger pressure area, the finger is when pressing the key, the magnetic force generator removes the precision that magnetic force sensor position can greatly improve, thereby can effectively improve the monitoring precision that the magnetic induction intensity changes, and then improve the judgment precision to the key state, and simultaneously, such setting up can make the numerical value precision that the black key detected keep unanimous with the numerical value precision that the white key detected, so that follow-up analysis improves the feedback precision.

Optionally, the magnetic sensors are located on the same sensor collecting plate, and the magnetic sensors are arranged in a staggered manner.

Through adopting above-mentioned technical scheme, same piece sensor acquisition board can carry all magnetic sensor's data, and the unified management of being convenient for simplifies mounting structure simultaneously.

Alternatively, the magnetic force sensor corresponding to the magnetic force generator on the black key is located on one sensor collecting plate, and the magnetic force sensor corresponding to the magnetic force generator on the white key is located on the other sensor collecting plate.

By adopting the technical scheme, the two different sensor acquisition boards are separately managed, the convenience of subsequent maintenance can be improved, the structure of the sensor acquisition board can be simplified, and the production efficiency of the sensor acquisition board is improved.

Optionally, the upper surface of the piano frame is provided with a black key flat pin connected with a black key and a white key flat pin connected with a white key, the distance from the magnetic force generator on the black key to the center point of the black key flat pin is L1, L1 is 60mm-62mm, the distance from the magnetic force generator on the white key to the center point of the white key flat pin is L2, and L2 is 80mm-82 mm.

Through adopting above-mentioned technical scheme, confirm the mounted position of magnetic force generator on the key, in the mounted position department of this scope, the magnetic force generator moves magnetic force sensor's detection precision higher, and magnetic force sensor is more reasonable with magnetic force generator's design mounted position, and the dynamics of black and white key detects more balanced science, and does not disturb the musical instrument body structure.

Optionally, the L1 is 60mm, and the L2 is 80 mm.

Through adopting above-mentioned technical scheme, the magnetic force generator is in this mounted position department, and the magnetic force generator moves magnetic force sensor's detection precision is the highest to can effectively improve magnetic force generator movement speed's measurement accuracy, magnetic force generator movement speed's measurement accuracy is higher, and the measurement accuracy of the loudness of piano sound production is higher when the key is pressed, and follow-up through the conversion, make the key can accurately send corresponding tone.

Optionally, the magnetic force generator is adhered to the lower surface of the black or white key by an adhesive member.

Through adopting above-mentioned technical scheme, conveniently regulate and control the mounted position of magnetic force generator, reduce the influence to magnetic force generator magnetism simultaneously, make things convenient for the debugging personnel to install magnetic force generator fast, reduce overall installation time.

Optionally, a threaded column is fixed on one side of the magnetic force generator, and the threaded column is in threaded connection with the bottom of the black key or the white key.

Through adopting above-mentioned technical scheme, the magnetic force generator is laminated with the bottom of black key or white key, utilizes the screw thread post to fix the magnetic force generator, has improved the stability of magnetic force generator installation, also is favorable to the dismouting of follow-up maintenance.

Optionally, a fixing seat is installed on the lower surface of the black key or the white key, and a magnetic force generator is detachably installed on the fixing seat.

Through adopting above-mentioned technical scheme, when follow-up maintenance needs dismouting magnetic force generator, can follow dismouting magnetic force generator on the fixing base, avoid magnetic force generator and key contact to lead to the follow-up key that damages when the dismouting of magnetic force generator, and then improve the life of key.

Optionally, the main control board is electrically connected to the back-end device through a peripheral interface, where the peripheral interface is a standard MIDI interface, a USB interface, or a bluetooth interface.

Through adopting above-mentioned technical scheme, the data that record transmit the rear end equipment through the peripheral hardware interface, and after these data conversion become loudness data, the loudness data can supply other people to look over, and then can be applied to distance education, and the setting of peripheral hardware interface has improved its suitability.

In a second aspect, a loudness determination method based on a keyboard instrument digital input system includes the following steps: s1, for any black key or white key on the piano, according to the magnetic induction intensity measured by the magnetic sensor arranged on the collecting plate of the collecting sensor corresponding to the key, the relative position relationship between the magnetic sensor and the magnetic generator can be calculated; s2, continuously sampling the magnetic induction B measured on each magnetic sensor by the main control board according to a specific sampling rate; s3, when the distance D between a certain key and the magnetic force sensor reaches a threshold value D1, recording the time T1; s4, when the distance D between a certain key and the magnetic force sensor reaches a threshold value D2, recording the time T2; s5, converting corresponding force data according to the result of V = (D2-D1)/(T2-T1), and coding and sending MIDI data by combining the serial number of the pressed key; and S6, when the distance D between a certain key and the magnetic force sensor reaches a threshold value D3, the key is considered to be released, and corresponding MIDI data is coded and transmitted.

Through adopting above-mentioned technical scheme, adopt contact sensor's principle with traditional electronic organ and compare, the magnetic force generator in this scheme and magnetic force sensor's design mounted position is more reasonable, and the dynamics of black and white key is gathered more accurately, and job stabilization does not basically receive the influence that light, temperature, humidity and musical instrument body structure warp.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the system greatly improves the accuracy of the magnetic force generator moving to the position of the magnetic force sensor, so that the measurement accuracy of the movement speed of the magnetic force generator can be effectively improved, and further, the measurement accuracy of the key dynamics when a key is pressed down in the system is improved, namely, the measurement accuracy of the loudness of the sound produced by the piano when the corresponding key is pressed down is improved;

2. the magnetic force generator is detachably connected with the keys, so that the installation position of the magnetic force generator can be conveniently regulated, the influence on the magnetism of the magnetic force generator is reduced, and the installation convenience of the magnetic force generator is improved;

3. compare with traditional electronic organ adopts contact sensor's principle, sensor mounted position is more reasonable in this scheme, and the dynamics is gathered more accurately, and job stabilization does not receive external influence basically.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present application.

Fig. 2 is a plan view of the entire structure of embodiment 1 of the present application.

Fig. 3 is a side view of embodiment 1 of the present application.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Fig. 5 is a plan view of the entire structure of embodiment 2 of the present application.

Fig. 6 is a side view mainly showing the connection of the magnetic force generator to the key in embodiment 3 of the present application.

Fig. 7 is a side view mainly showing the connection of the magnetic force generator to the key in embodiment 4 of the present application.

Fig. 8 is a side view mainly showing the connection of the magnetic force generator to the key in embodiment 5 of the present application.

Fig. 9 is a side view mainly showing the connection of the magnetic force generator to the key in embodiment 6 of the present application.

Description of reference numerals: 10. a musical instrument frame; 11. a black bond; 111. a black key finger pressure application area; 112. a black key flat pin; 12. a white bond; 121. a white key finger pressing area; 122. a white key flat pin; 13. a groove; 2. a magnetic force generator; 3. a support plate; 4. a sensor acquisition board; 5. a magnetic force sensor; 6. a main control panel; 71. rubberized fabric; 72. a threaded post; 73. a fixed seat; 731. mounting grooves; 74. locking the screw; 75. and (3) an adhesive.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

In a first aspect, embodiments of the present application disclose a keyboard musical instrument digital input system.

Example 1

Referring to fig. 1 and 2, the input system includes a frame 10, and black keys 11 and white keys 12 alternately provided on the frame 10, the black keys 11 having black key finger pressing regions 111 on the upper surface thereof, the white keys 12 having white key finger pressing regions 121 on the upper surface thereof, and the black keys 11 and the white keys 12 having magnetic force generators 2 on the lower surfaces thereof, in this embodiment, the magnetic force generators 2 are magnets.

Meanwhile, the support plate 3 is installed below the magnetic force generator 2 through screws on the piano frame 10, the sensor collecting plate 4 is installed on the top side of the support plate 3 through screws, the magnetic force sensors 5 are electrically connected to one side of the sensor collecting plate 4 facing the magnetic force generator 2, and the magnetic force sensors 5 correspond to the magnetic force generator 2 one to one. Wherein, still be equipped with the main control panel 6 on the musical instrument frame 10, the main control panel 6 is connected with sensor acquisition board 4 electricity through data bus, and the main control panel 6 is connected with the rear end equipment electricity through the peripheral hardware interface, and the peripheral hardware interface is standard MIDI interface, USB interface or bluetooth interface to improve its suitability.

Among them, the magnetic force generator 2 located on the black key 11 is disposed near the back side of the black key finger pressing region 111, and the magnetic force generator 2 located on the white key 12 is disposed near the back side of the white key finger pressing region 121.

Referring to fig. 3, the black key paddle 112 is mounted on the upper surface of the frame 10 at a position corresponding to the black key 11, the black key paddle 112 is connected to the front pin of the black key 11, the white key paddle 122 is mounted on the upper surface of the frame 10 at a position corresponding to the white key 12, and the white key paddle 122 is connected to the front pin of the white key 12.

Specifically, the distance from the magnetic force generator 2 on the black key 11 to the center point of the black key paddle 112 was L1, and L1 was 60mm to 62mm, at which position the detection accuracy of the movement of the magnetic force generator 2 to the position of the magnetic force sensor 5 was 0.02 mm. The distance from the magnetic force generator 2 on the white key 12 to the center point of the white key paddle 122 was L2, and L2 was 80mm-82mm, at which position the detection accuracy of the movement of the magnetic force generator 2 to the position of the magnetic force sensor 5 was 0.02 mm.

More specifically, when L1 is 60mm and L2 is 80mm, the detection precision is best, and the detection precision can reach 0.01 mm.

Referring to fig. 2, the magnetic force sensor 5 corresponding to the magnetic force generator 2 on the black key 11 and the magnetic force sensor 5 corresponding to the magnetic force generator 2 on the white key 12 are both located on the same sensor collecting plate 4, so that the position of the magnetic force sensor 5 can be set on the sensor collecting plate 4 in advance, and after the sensor collecting plate 4 is fixed, the magnetic force generator 2 is debugged later.

Referring to fig. 4, in order to adjust the position of the magnetic force generator 2, the magnetic force generator 2 is attached to the lower surface of the black key 11 or the white key 12 by an adhesive member, in this embodiment, the adhesive member is a tape 71, the tape 71 covers the circumferential surface of the magnetic force generator 2, and the uniformity of the magnetic force is ensured by accurately adjusting the position of the magnetic force generator 2.

The implementation principle of the keyboard instrument digital input system in the embodiment of the application is as follows: when pressing black key 11 or white key 12, magnetic force generator 2 and magnetic force sensor 5's position takes place relative change, and magnetic force sensor 5 can detect near magnetic induction numerical value to feed back the numerical value that measures to sensor acquisition board 4, finally feed back to the rear end equipment by main control board 6, judge the state of key and feed back corresponding loudness through the numerical value that measures, realize the process that mechanical action converts into digital signal.

The advantage of this scheme lies in, the magnetic force generator 2 of black key 11 department and the magnetic force generator 2 staggered arrangement of white key 12 department, and all be close to the back in respective finger pressure area, the finger is when pressing the key, the precision that magnetic force generator 2 moved 5 positions of magnetic force sensor can greatly be improved, thereby can effectively improve the monitoring precision that the magnetic induction intensity changes, and then improve the judgement precision to the key state, and simultaneously, such setting up can make the numerical value that black key 11 detected keep unanimous with the numerical value that white key 12 detected, so that follow-up analysis and improvement feedback precision.

Example 2

The present embodiment is different from embodiment 1 in that the structure of the sensor collecting plate 4 is different. Referring to fig. 5, in the present embodiment, the sensor collecting plates 4 are provided in two, the magnetic force sensors 5 corresponding to the magnetic force generators 2 on the black keys 11 are located on one sensor collecting plate 4, the magnetic force sensors 5 corresponding to the magnetic force generators 2 on the white keys 12 are located on the other sensor collecting plate 4, and the two sensor collecting plates 4 are located on the same plane and are electrically connected to the main control board 6.

Therefore, the magnetic force generator 2 can be fixed in advance, and the positions of the two sensor acquisition plates 4 are respectively adjusted, so that the convenience of debugging and installation is improved.

Example 3

The present embodiment is different from embodiment 1 in the way in which the magnetic force generator 2 is fixed to the black key 11 or white key 12. Referring to fig. 6, in the present embodiment, a threaded column 72 is vertically fixed to one side surface of the magnetic force generator 2, the threaded column 72 penetrates into the black key 11 or the white key 12 from bottom to top in the vertical direction, the threaded column 72 is screwed with the black key 11 or the white key 12, and the upper surface of the magnetic force generator 2 is attached to the lower surface of the black key 11 or the white key 12.

The present embodiment has an advantage over embodiment 1 in that the magnetic force generator 2 is more stably mounted and is easily disassembled and replaced.

Example 4

The present embodiment is different from embodiment 1 in the way in which the magnetic force generator 2 is fixed to the black key 11 or white key 12. Referring to fig. 7, in the embodiment, the recess 13 is formed on the lower surface of the black key 11 or the white key 12, the fixing seat 73 is fixed in the recess 13 by a screw, the lower surface of the black key 11 or the white key 12 extends from one side of the fixing seat 73 away from the recess 13, the mounting groove 731 is formed on one side of the fixing seat 73 away from the recess 13, and the magnetic force generator 2 is embedded in the mounting groove 731.

Meanwhile, a locking screw 74 is connected to the side wall of the fixing base 73 in a threaded manner, and a head end of the locking screw 74 penetrates through the side wall of the fixing base 73 along the radial direction of the fixing base 73 and abuts against the side wall of the magnetic force generator 2, so that the magnetic force generator 2 is fixed.

The advantage of this embodiment compared with embodiment 1 is that, when the magnetic force generator 2 needs to be disassembled for subsequent maintenance, the magnetic force generator 2 can be disassembled from the fixing base 73, thereby avoiding the direct contact between the magnetic force generator 2 and the black key 11 or the white key 12, which causes the damage to the black key 11 or the white key 12 when the magnetic force generator 2 is disassembled for subsequent times, and further improving the service life of the key.

Example 5

The present embodiment is different from embodiment 4 in the way of mounting the magnetic force generator 2 and the holder 73. Referring to fig. 8, in the present embodiment, a threaded column 72 is fixed to one side surface of the magnetic force generator 2, the threaded column 72 penetrates into the fixing base 73 in the vertical direction and is in threaded connection with the fixing base 73, and one side of the magnetic force generator 2 facing the threaded column 72 is flush with one side of the fixing base 73 away from the recess 13.

Compared with embodiment 4, the present embodiment has the advantages that the magnetic force generator 2 can be disassembled and assembled on the fixing base 73 by rotating the magnetic force generator 2, so that the disassembling and assembling convenience is improved, the direct contact between the magnetic force generator 2 and the black key 11 or the white key 12 is avoided, and the influence of the repeated disassembling and assembling of the magnetic force generator 2 on the service life of the black key 11 or the white key 12 is reduced.

Example 6

The present embodiment is different from embodiment 1 in the way in which the magnetic force generator 2 is fixed to the black key 11 or white key 12. Referring to fig. 9, in the present embodiment, the adhesive 75 is used as the adhesive member, the adhesive 75 is located between the magnetic force generator 2 and the lower surface of the black key 11 or white key 12, and the magnetic force generator 2 is adhered to the lower surface of the black key 11 or white key 12 through the adhesive 75.

The present embodiment has an advantage over embodiment 1 in that the installation speed of the magnetic force generator 2 is faster.

In a second aspect, the embodiment of the present application further discloses a loudness determination method based on a keyboard instrument digital input system, including the following steps:

s1, for any black key 11 or white key 12 on the piano, the relative position relationship between the magnetic sensor 5 and the magnetic generator 2 can be calculated according to the magnetic induction intensity measured by the magnetic sensor 5 mounted on the key corresponding position acquisition sensor acquisition board 4.

And S2, continuously sampling the magnetic induction B measured on each magnetic sensor 5 by the main control board 6 according to a specific sampling rate.

S3, when the distance D between the magnetic force generator 2 and the magnetic force sensor 5 on a certain key reaches the threshold D1, the time T1 is recorded.

S4, when the distance D between the magnetic force generator 2 and the magnetic force sensor 5 on a certain key reaches the threshold D2, the time T2 is recorded.

And S5, converting corresponding force data according to the result of V = D2-D1/(T2-T1), and coding and transmitting MIDI data by combining the serial number of the pressed key.

S6, when the distance D between the magnetic force generator 2 and the magnetic force sensor 5 on a certain key reaches the threshold value D3, it is considered that the key is released, and the corresponding MIDI data is encoded and transmitted.

Further, the loudness of the whole piano can be adjusted according to actual conditions, that is, the loudness adjustability is improved by adjusting a look-up table of the key velocity V and the key dynamics, for example, when the time V =0.1m/s, the key dynamics can be 64 (the dynamics value specified in the MIDI standard should be between 0 and 127 and is an integer) or other values.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.