CN112634839A - Digital piano electroacoustic device with string striking mechanism and sound production control method thereof - Google Patents
Digital piano electroacoustic device with string striking mechanism and sound production control method thereof Download PDFInfo
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- 230000009471 action Effects 0.000 claims description 9
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- 238000004458 analytical method Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
- G10C3/16—Actions
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
- G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
Abstract
A digital piano electroacoustic device with a string striking mechanism and a sound production control method thereof comprise a keyboard chassis (1), and are characterized in that: the mechanical piano keyboard is characterized in that a conductive rubber block (6) is installed below the bottom of each keyboard key (2), a keyboard circuit board (7) is arranged on each conductive rubber block (6), a keyboard tail end sensor (23) is arranged at the keyboard tail end of each conductive rubber block (6), a keyboard front end sensor (24) is arranged at the keyboard front end of each conductive rubber block (6), an ejector rod (11) is installed on a linkage (9) through an ejector rod articulated shaft (10), and a simulated string striking hammer (15) is arranged on one side of the upper end of a keyboard rear support (3) close to the top end of the ejector rod (11).
Description
Technical Field
The invention relates to a digital piano electroacoustic device and a sound production control method thereof, in particular to a digital piano electroacoustic device with a string striking mechanism and a sound production control method thereof, belonging to the technical field of piano musical instruments.
Background
The digital piano in the existing market is favored by mass music enthusiasts with excellent timbre and rich multimedia functions, and has the advantages of convenient maintenance, high quality and low price, and the like. However, with the improvement of the player on the playing requirement and the leap of the electronic technology, the defect of poor hand feeling of the existing digital piano is slowly highlighted, and compared with the traditional piano, the keyboard has poor hand feeling, light strength, poor player experience and insufficient expressive force. The sound production control can only be simulated through digital piano control system to current digital piano, what adopt is electronic switch formula piano key structure, sound through the stereo set broadcast, can only simulate the sound production, unable accurate play traditional mechanical type piano's musical instrument sound loudness and intensity, the musical instrument sound production effect is not good, and the fidelity is not high, is unfavorable for player to play horizontally full play, can not reach traditional mechanical type piano's result of use far away in the result of use.
Disclosure of Invention
The invention aims to overcome the defects and defects that the conventional digital piano has a simple structure, and the structural form of an electronic switch adopted by the piano keys has poorer keyboard hand feeling, light dynamics, poor experience of players and poor expressive force compared with the conventional piano.
The second purpose of the invention is to provide a sound control method of digital piano with a string-striking mechanism, which is reasonable in method, simple and convenient in algorithm, high in response speed, good in sound production effect and high in fidelity, can accurately simulate the loudness and strength of the piano sound of the traditional mechanical piano, is beneficial to the full play of the playing level of players, and aims at solving the defects and defects that the existing sound production device of digital piano can only carry out sound simulation and produce sound through sound playing, cannot accurately simulate the loudness and strength of the piano sound of the traditional mechanical piano, is not good in piano sound production effect and low in fidelity, and is not beneficial to the full play of the playing level of players.
In order to achieve the purpose, the technical solution of the invention is as follows: the utility model provides a digital piano electroacoustic device with action mechanism, includes the keyboard chassis, installs the keyboard button on the keyboard chassis, and the rear of keyboard button is provided with keyboard after-poppet, its characterized in that: the keyboard comprises a keyboard rear support and is characterized in that a conductive rubber block is installed below the bottom of a keyboard key, a keyboard circuit board is arranged on the conductive rubber block, a keyboard tail end sensor is arranged at the keyboard tail end on the conductive rubber block, a keyboard front end sensor is arranged at the keyboard front end on the conductive rubber block, a linkage device is installed at one side, close to the keyboard key, of the middle of the keyboard rear support through a connecting shaft, a push rod is installed on the linkage device through a push rod hinged shaft, a simulation string striking hammer is arranged at the top end, close to the push rod, of one side of the upper end of the keyboard rear support, the simulation string striking hammer is installed on the keyboard rear support through a swinging shaft, a keyboard top end sensor is arranged on the outer side of the upper end of.
Further, a key tail balancing weight is arranged at the rear part of the keyboard key, a key tail positioning pin is arranged between the bottom of the key tail balancing weight and the keyboard chassis of the keyboard key, and the key tail positioning pin is fixedly arranged at the bottom of the keyboard key or at the upper end of the keyboard chassis.
Furthermore, a top rod limiting block corresponding to one side of the top rod is fixedly arranged on the side surface, close to the top rod, of the keyboard rear support, and a lower limiting block corresponding to the other side of the top rod is arranged on the other side of the top rod.
Furthermore, a wood supporting rod extending upwards is fixed on one side of the upper surface of the linkage device, and a wood supporting rod is fixedly arranged at the top end of the wood supporting rod.
Furthermore, the ejector rod is of an L-shaped structure, an ejector rod spring is installed between the lower portion of the ejector rod and the linkage device, and a staple bolt is vertically fixed on a keyboard key at the lower end of the linkage device.
Furthermore, a limiting block is arranged between the ejector rod and the wood supporting rod, and the limiting block is fixed with the keyboard rear support through a limiting block connecting rod.
Further, keyboard tail end sensor, keyboard front end sensor and keyboard top end sensor are connected with the input of digital piano treater respectively, and the output of digital piano treater is connected with digital piano sound production control system, and digital piano sound production control system is connected with sound generating mechanism.
In order to achieve the second object, the technical solution of the present invention is: a sound production control method for a digital piano with a string striking mechanism is characterized by comprising the following steps:
a. when a piano user strikes a keyboard key, the keyboard key moves downwards to sequentially trigger a keyboard tail end sensor, a keyboard front end sensor and a keyboard top end sensor on the conductive rubber block, the keyboard tail end sensor, the keyboard front end sensor and the keyboard top end sensor are respectively conducted and have time difference, the conduction time node of the keyboard tail end sensor is t1, and the conduction time node of the keyboard front end sensor is t 2;
b. the keyboard keys move downwards to drive the linkage device and the ejector rod to act, so that the simulated string striking hammer is driven to swing to one side of the keyboard rear support by a certain angle around the swinging shaft, the back surface of the simulated string striking hammer is in contact with a keyboard top end sensor embedded on the surface of the keyboard rear support, the keyboard top end sensor is triggered, the conduction time is t3, and the conduction time node of the keyboard top end sensor is t 3;
c. respectively calculating the conduction time difference of a keyboard front end sensor and a keyboard tail end sensor as a Δ t1= t2-t1 and the conduction time difference of a keyboard top end sensor and a keyboard tail end sensor as a Δ t2= t3-t1 by the digital piano processor;
d. then, the average value of the key time difference is obtained according to the time difference, and the specific algorithm formula is as follows: Δ t = √ Δ t1 2+∆t2 2) Obtaining an accurate key time average value;
e. then comparing the average value of the key time difference with a digital piano key time difference and force value corresponding table obtained through intensive sampling analysis to obtain a corresponding force value;
f. and finally, calculating and matching the style and the strength of the current sound according to the force value of the keyboard by using the digital piano processor, calling a sound production file in the ROM or the FLASH through a system bus port, and finally transmitting the loudness and the strength value of the piano sound to a digital piano sound production control system to produce the piano sound with corresponding loudness and strength.
The invention has the beneficial effects that:
1. the novel string striking mechanism formed by the linkage device, the simulated string striking hammer, the string striking hammer counter weight, the limiting blocks and the like is adopted, so that the keyboard structure has good mechanical performance, the playing hand feeling of the traditional mechanical piano is achieved when the novel string striking mechanism is applied to the digital piano, and the outstanding problem of poor hand feeling of the keyboard of the traditional digital piano is effectively solved.
2. According to the invention, a plurality of sensors are arranged at a plurality of key parts on the basis of a string striking machine mechanism, so that the triggering time of keys during piano playing is skillfully monitored and captured, the pressing value or the keystroke strength is matched through the average value of the conduction time difference among the sensors, and then the digital piano processor is used for controlling the emission of the piano sound with corresponding loudness and strength.
3. The invention has reasonable structure, simple and convenient control algorithm, can accurately simulate the volume and the strength of the piano sound of the traditional mechanical piano, has good piano sound production effect and high fidelity, is beneficial to the full play of the playing level of players, has good playing hand feeling, beautiful piano sound and good expressive force compared with the traditional digital piano, integrates partial advantages of the traditional mechanical piano, and further improves the grade of the digital piano.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: the keyboard comprises a keyboard underframe 1, keyboard keys 2, a keyboard rear support 3, a key tail balancing weight 4, a key tail positioning pin 5, a conductive rubber block 6, a keyboard circuit board 7, a connecting shaft 8, a linkage device 9, an ejector rod articulated shaft 10, an ejector rod 11, an ejector rod spring 12, an ejector rod limiting block 13, a lower limiting block 14, a simulated string striking hammer 15, a swinging shaft 16, a string striking hammer counter weight 17, a limiting block connecting rod 18, a limiting block 19, a wood supporting rod 20, a wood supporting 21, a staple bolt 22, a keyboard tail end sensor 23, a keyboard front end sensor 24 and a keyboard top end sensor 25.
Detailed Description
The invention is described in further detail below with reference to the following description of the drawings and the detailed description.
Referring to fig. 1, the invention relates to an electroacoustic device of a digital piano with a string striking mechanism, which comprises a keyboard chassis 1, wherein keyboard keys 2 are arranged on the keyboard chassis 1, and a keyboard rear support 3 is arranged behind the keyboard keys 2, and is characterized in that: the keyboard is characterized in that a conductive rubber block 6 is installed below the bottom of each keyboard key 2, a keyboard circuit board 7 is arranged on each conductive rubber block 6, a keyboard tail end sensor 23 is arranged at the keyboard tail end of each conductive rubber block 6, a keyboard front end sensor 24 is arranged at the keyboard front end of each conductive rubber block 6, a linkage 9 is installed at one side, close to each keyboard key 2, of the middle of each keyboard rear support 3 through a connecting shaft 8, a push rod 11 is installed on each linkage 9 through a push rod hinged shaft 10, a simulation string striking hammer 15 is arranged at the top end, close to each push rod 11, of one side of the upper end of each keyboard rear support 3, the simulation string striking hammer 15 is installed on each keyboard rear support 3 through a swinging shaft 16, a keyboard top end sensor 25 is arranged at the outer side of the upper end of each keyboard rear support 3 corresponding to the simulation string striking.
The rear part of the keyboard key 2 is provided with a key tail balancing weight 4, a key tail positioning pin 5 is arranged between the bottom of the key tail balancing weight 4 of the keyboard key 2 and the keyboard chassis 1, and the key tail positioning pin 5 is fixedly arranged at the bottom of the keyboard key 2 or the upper end of the keyboard chassis 1.
A top rod limiting block 13 corresponding to one side of the top rod 11 is fixedly arranged on the side surface of the keyboard rear support 3 close to the top rod 11, and a lower limiting block 14 corresponding to the other side of the top rod 11 is arranged on the other side of the top rod 11.
A wood supporting rod 20 extending upwards is fixed on one side of the upper surface of the linkage 9, and a wood supporting 21 is fixedly arranged at the top end of the wood supporting rod 20.
The ejector rod 11 is of an L-shaped structure, an ejector rod spring 12 is arranged between the lower part of the ejector rod 11 and the linkage device 9, and a staple bolt 22 is vertically fixed on the keyboard key 2 at the lower end of the linkage device 9.
A limiting block 19 is arranged between the ejector rod 11 and the wood supporting rod 20, and the limiting block 19 is fixed with the keyboard rear support 3 through a limiting block connecting rod 18.
The keyboard tail end sensor 23, the keyboard front end sensor 24 and the keyboard top end sensor 25 are respectively connected with the input end of the digital piano processor, the output end of the digital piano processor is connected with the digital piano sounding control system, and the digital piano sounding control system is connected with the sounding device.
A sound production control method for a digital piano with a string striking mechanism is characterized by comprising the following steps:
a. when a piano user strikes the keyboard key 2, the keyboard key 2 moves downwards to sequentially trigger the keyboard tail end sensor 23, the keyboard front end sensor 24 and the keyboard top end sensor 25 on the conductive rubber block 6, the keyboard tail end sensor 23, the keyboard front end sensor 24 and the keyboard top end sensor 25 are respectively conducted and have time difference, the conduction time node of the keyboard tail end sensor 23 is t1, and the conduction time node of the keyboard front end sensor 24 is t 2;
b. the keyboard keys 2 move downwards to drive the linkage device 9 and the ejector rod 11 to act, so that the simulation hammer 15 is driven to swing to one side of the keyboard rear support 3 by a certain angle around the swing shaft 16, the back surface of the simulation hammer 15 is in contact with a keyboard top end sensor 25 embedded on the surface of the keyboard rear support 3, the keyboard top end sensor 25 is triggered, the conduction time is t3, and the conduction time node of the keyboard top end sensor 25 is t 3;
c. respectively calculating the conducting time difference of the keyboard front end sensor 24 and the keyboard tail end sensor 23 as t1= t2-t1 and the conducting time difference of the keyboard top end sensor 25 and the keyboard tail end sensor 23 as t2= t3-t1 by the digital piano processor;
d. then, the average value of the key time difference is obtained according to the time difference, and the specific algorithm formula is as follows: Δ t = √ Δ t1 2+∆t2 2) Obtaining an accurate key time average value;
e. then comparing the average value of the key time difference with a digital piano key time difference and force value corresponding table obtained through intensive sampling analysis to obtain a corresponding force value;
f. and finally, calculating and matching the style and the strength of the current sound according to the force value of the keyboard by using the digital piano processor, calling a sound production file in the ROM or the FLASH through a system bus port, and finally transmitting the loudness and the strength value of the piano sound to a digital piano sound production control system to produce the piano sound with corresponding loudness and strength.
As shown in fig. 1, a keyboard key 2 is mounted on a keyboard chassis 1, a conductive rubber block 6 is mounted below the bottom of the keyboard key 2, the conductive rubber block 6 is arranged corresponding to a keyboard circuit board 7, and the conductive rubber block 6 can be connected with a corresponding circuit on the keyboard circuit board 7 when the keyboard key 2 is pressed down. Meanwhile, the invention is provided with sensors at the lower end contact part of the keyboard key 2 or the lower end contact part of the conductive rubber block 6, such as: the keyboard tail end sensor 23 is arranged at the keyboard tail end of the conductive rubber block 6, the keyboard front end sensor 24 is arranged at the keyboard front end of the conductive rubber block 6, when a user strikes the keyboard keys 2, the keyboard keys 2 move downwards to sequentially trigger the keyboard tail end sensor 23 and the keyboard front end sensor 24 on the conductive rubber block 6, and corresponding electric signals are generated.
The rear part of the keyboard key 2 is provided with a key tail balancing weight 4 for increasing the weight of the key tail part, a key tail positioning pin 5 is arranged between the bottom of the key tail balancing weight 4 of the keyboard key 2 and the keyboard chassis 1, and the key tail positioning pin 5 is fixedly arranged at the bottom of the keyboard key 2 or at the upper end of the keyboard chassis 1.
The rear side of the keyboard key 2 is provided with a keyboard rear support 3, one side of the middle part of the keyboard rear support 3, which is close to the keyboard key 2, is provided with a linkage device 9 through a connecting shaft 8, the linkage device 9 is provided with a mandril 11 through a mandril articulated shaft 10, the mandril 11 is of an L-shaped structure, a mandril spring 12 is arranged between the lower part of the mandril 11 and the linkage device 9, spring guide holes are respectively arranged on the mandril 11 and the mandril spring 12, and the mandril spring 12 plays a role in resetting the mandril 11. The lower end of the linkage device 9 is vertically fixed with a staple bolt 22 on the keyboard key 2, and the lower end of the linkage device 9 is connected with the keyboard key 2 through the staple bolt 22. A wood supporting rod 20 extending upwards is fixed on one side of the upper surface of the linkage 9, and a wood supporting 21 is fixed at the top end of the wood supporting rod 20.
A top rod limiting block 13 corresponding to one side of the top rod 11 is fixedly arranged on the side surface, close to the top rod 11, of the keyboard rear support 3, and the top rod limiting block 13 is used for limiting the top rod 11 when swinging towards one side of the keyboard rear support 3. The other side of the ejector rod 11 is provided with a lower limiting block 14 corresponding to the other side of the ejector rod 11, the lower limiting block 14 is fixed on the keyboard rear support 3 through a connecting rod, the height of the lower limiting block 14 is lower than that of the ejector rod limiting block 13, and the lower limiting block 14 is used for limiting the ejector rod 11 when swinging towards one side of the support wood 21.
A limiting block 19 is arranged between the ejector rod 11 and the wood supporting rod 20, the limiting block 19 is fixed with the keyboard rear support 3 through a limiting block connecting rod 18, and the limiting block connecting rod 18 is located under the ejector rod limiting block 13. A simulation hammer 15 is arranged on one side of the upper end of the keyboard rear support 3 close to the top end of the ejector rod 11, a hammer counter weight 17 is fixedly arranged at the tail end of the simulation hammer 15, the simulation hammer 15 is installed on the keyboard rear support 3 through a swinging shaft 16, the swinging shaft 16 adopts a Shendao structure, the arc surface of the lower edge of the simulation hammer 15 is placed at the top end of the ejector rod 11, and a felt pad is arranged at the contact part of the outer surface of the simulation hammer 15 and the ejector rod 11. Felt pads are also provided at the contact portions between the simulated hammer 15 and the both ends of the back timber 21 to reduce hitting noise.
The upper end outer side of the keyboard rear bracket 3 is provided with a keyboard top end sensor 25 corresponding to the simulation hammer 15, and after the simulation hammer 15 rotates upwards for a certain angle around the swinging shaft 16, the keyboard top end sensor 25 is triggered to generate a corresponding electric signal. Keyboard tail end sensor 23, keyboard front end sensor 24 and keyboard top end sensor 25 are connected with the input of digital piano treater respectively, and the output of digital piano treater is connected with digital piano sound production control system, and digital piano sound production control system is connected with sound generating mechanism, simulates the loudness and the intensity of the musical instrument of traditional mechanical piano through sound generating mechanism, has reached fine musical instrument sound production effect.
Number with action mechanism of the inventionThe sound production control method and process of the grand piano are as follows: the piano user strikes the keyboard afterbody when striking keyboard button 2, keyboard button 2 downstream can trigger keyboard tail end sensor 23, keyboard front end sensor 24 and keyboard top end sensor 25 on the conductive rubber piece 6 in proper order, and keyboard tail end sensor 23, keyboard front end sensor 24 and keyboard top end sensor 25 can switch on respectively and have the time difference, and the time node that switches on of keyboard tail end sensor 23 is t1, and the time node that switches on of keyboard front end sensor 24 is t 2. The keyboard keys 2 move downwards to drive the linkage device 9 and the ejector rod 11 to move, so that the simulation hammer 15 is driven to swing by a certain angle around the swing shaft 16 towards one side of the keyboard rear support 3, the back surface of the simulation hammer 15 is in contact with the keyboard top end sensor 25 embedded on the surface of the keyboard rear support 3, the keyboard top end sensor 25 is triggered, the conduction time is t3, and the conduction time node of the keyboard top end sensor 25 is t3, and the unit is millisecond. The digital piano processor calculates the conduction time difference between the keyboard front sensor 24 and the keyboard rear sensor 23 as Δ t1= t2-t1, and the conduction time difference between the keyboard top sensor 25 and the keyboard rear sensor 23 as Δ t2= t3-t 1. Then, the average value of the key time difference is obtained according to the time difference, and the specific algorithm formula is as follows: Δ t = √ Δ t1 2+∆t2 2) And summing the square of the Δ t1 and the square of the t2 and then opening the square to obtain the accurate key time average value.
And then comparing the average value of the key time difference with a digital piano key time difference and force value corresponding table obtained through intensive sampling analysis to obtain a corresponding force value, wherein the unit of the force value is Newton. The key time difference and force value corresponding table is obtained by obtaining a large amount of playing data of the traditional mechanical piano and then summarizing and sorting the playing data in practice through repeated verification. And finally, calculating and matching the style and the strength of the current sound according to the force value of the keyboard by using the digital piano processor, calling a sound production file in the ROM or the FLASH through a system bus port, and finally transmitting the loudness and the strength value of the piano sound to a digital piano sound production control system to produce the piano sound with corresponding loudness and strength.
The invention adopts the structures of the linkage device, the simulated string striking hammer, the string striking hammer counter weight, the plurality of limiting blocks and the like, so that the keyboard structure has good mechanical performance, the playing hand feeling of the traditional mechanical piano is achieved, and the experience of a player is improved. Compared with the existing digital piano, the piano has good playing hand feeling, beautiful piano sound and good expressive force, combines partial advantages of the traditional mechanical piano and further improves the grade of the digital piano. Meanwhile, signals are collected through the sensor, the problem of accurate determination according to force values is creatively solved, the control algorithm is simple, the response speed is high, the loudness and the strength of the piano sound of the traditional mechanical piano can be completely and truly matched and simulated, the good piano sound production effect is achieved, the fidelity is high, and the playing performance level is high.
While the invention has been described in detail with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit of the invention.
Claims (8)
1. The utility model provides a digital piano electroacoustic device with action mechanism, includes keyboard chassis (1), installs keyboard button (2) on keyboard chassis (1), and the rear of keyboard button (2) is provided with keyboard after-poppet (3), its characterized in that: a conductive rubber block (6) is installed below the bottom of the keyboard key (2), a keyboard circuit board (7) is arranged on the conductive rubber block (6), a keyboard tail end sensor (23) is arranged at the keyboard tail end on the conductive rubber block (6), a keyboard front end sensor (24) is arranged at the keyboard front end on the conductive rubber block (6), a linkage device (9) is installed at one side of the middle part of the keyboard rear support (3) close to the keyboard key (2) through a connecting shaft (8), a mandril (11) is installed on the linkage device (9) through a mandril articulated shaft (10), a simulation string striking hammer (15) is arranged at one side of the upper end of the keyboard rear support (3) close to the top end of the mandril (11), the simulation string striking hammer (15) is installed on the keyboard rear support (3) through a swinging shaft (16), a keyboard top end sensor (25) is arranged at the outer side of the upper end of the keyboard rear support (3, the tail end of the simulated string-striking hammer (15) is fixedly provided with a string-striking hammer counterweight (17).
2. The digital piano electroacoustic device with action mechanism of claim 1, wherein: the keyboard is characterized in that a key tail balancing weight (4) is arranged at the rear part of the keyboard key (2), a key tail positioning pin (5) is arranged between the bottom of the key tail balancing weight (4) and the keyboard chassis (1) of the keyboard key (2), and the key tail positioning pin (5) is fixedly arranged at the bottom of the keyboard key (2) or at the upper end of the keyboard chassis (1).
3. The digital piano electroacoustic device with action mechanism of claim 1, wherein: the side surface of the keyboard rear support (3) close to the ejector rod (11) is fixedly provided with an ejector rod limiting block (13) corresponding to one side of the ejector rod (11), and the other side of the ejector rod (11) is provided with a lower limiting block (14) corresponding to the other side of the ejector rod (11).
4. The digital piano keyboard structure with action mechanism according to claim 1, wherein: a wood supporting rod (20) extending upwards is fixed on one side of the upper surface of the linkage device (9), and a wood supporting rod (21) is fixedly arranged at the top end of the wood supporting rod (20).
5. The digital piano electroacoustic device with action mechanism of claim 1, wherein: the ejector rod (11) is of an L-shaped structure, an ejector rod spring (12) is installed between the lower portion of the ejector rod (11) and the linkage device (9), and a staple bolt (22) is vertically fixed on a keyboard key (2) at the lower end of the linkage device (9).
6. The digital piano electroacoustic device with action mechanism of claim 1, wherein: a limiting block (19) is arranged between the ejector rod (11) and the wood supporting rod (20), and the limiting block (19) is fixed with the keyboard rear support (3) through a limiting block connecting rod (18).
7. The digital piano electroacoustic device with action mechanism of claim 1, wherein: the keyboard tail end sensor (23), the keyboard front end sensor (24) and the keyboard top end sensor (25) are respectively connected with the input end of the digital piano processor, the output end of the digital piano processor is connected with the digital piano sounding control system, and the digital piano sounding control system is connected with the sounding device.
8. A sound production control method for a digital piano with a string striking mechanism is characterized by comprising the following steps:
a. a piano user strikes the tail of a keyboard when striking the keyboard key (2), the keyboard key (2) moves downwards to sequentially trigger a keyboard tail end sensor (23), a keyboard front end sensor (24) and a keyboard top end sensor (25) on a conductive rubber block (6), the keyboard tail end sensor (23), the keyboard front end sensor (24) and the keyboard top end sensor (25) are respectively conducted and have time difference, the conduction time node of the keyboard tail end sensor (23) is t1, and the conduction time node of the keyboard front end sensor (24) is t 2;
b. the keyboard key (2) moves downwards to drive the linkage device (9) and the ejector rod (11) to act, further drive the simulation string striking hammer (15) to swing for a certain angle around the swinging shaft (16) towards one side of the keyboard rear support (3), the back of the simulation string striking hammer (15) is in contact with a keyboard top end sensor (25) embedded on the surface of the keyboard rear support (3), the keyboard top end sensor (25) is triggered, the conduction time is t3, and the conduction time node of the keyboard top end sensor (25) is t 3;
c. respectively calculating the conduction time difference of the keyboard front end sensor (24) and the keyboard tail end sensor (23) as Δ t1= t2-t1 and the conduction time difference of the keyboard top end sensor (25) and the keyboard tail end sensor (23) as t2= t3-t1 by the digital piano processor;
d. then, the average value of the key time difference is obtained according to the time difference, and the specific algorithm formula is as follows: Δ t = √ Δ t1 2+∆t2 2) Obtaining an accurate key time average value;
e. then comparing the average value of the key time difference with a digital piano key time difference and force value corresponding table obtained through intensive sampling analysis to obtain a corresponding force value;
f. and finally, calculating and matching the style and the strength of the current sound according to the force value of the keyboard by using the digital piano processor, calling a sound production file in the ROM or the FLASH through a system bus port, and finally transmitting the loudness and the strength value of the piano sound to a digital piano sound production control system to produce the piano sound with corresponding loudness and strength.
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| CN110431617A (en) * | 2017-03-15 | 2019-11-08 | 雅马哈株式会社 | Signal supply device, key board unit and program |
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2020
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| CN105845117A (en) * | 2015-02-04 | 2016-08-10 | 雅马哈株式会社 | Keyboard unit |
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