CN105702241A - Four-foot-operated digital piano and accent strengthening method - Google Patents
Four-foot-operated digital piano and accent strengthening method Download PDFInfo
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- CN105702241A CN105702241A CN201610136417.XA CN201610136417A CN105702241A CN 105702241 A CN105702241 A CN 105702241A CN 201610136417 A CN201610136417 A CN 201610136417A CN 105702241 A CN105702241 A CN 105702241A
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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
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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
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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
- G10H1/46—Volume control
Abstract
The present invention discloses a four-foot-operated digital piano, which comprises a piano body, keys, a piano control panel, a piano side plate, piano feet, a power supply and a pedal box. The pedal box is sequentially provided with an off-beat pedal, a selection sostenuto pedal and a sostenuto pedal. The off-beat pedal, the selection sostenuto pedal and the sostenuto pedal are connected with a sound source module through a pedal interface circuit. The keys, the piano control panel and the sound source module are connected. The power supply powers on a power amplifier module and the sound source module. The pedal box is further provided with an accent pedal. The accent pedal is connected with the sound source module via the pedal interface circuit. According to the technical scheme of the invention, on the basis of an original three-foot-operated digital piano, the accent pedal is additionally arranged. Therefore, the recording having the accent strengthening function is additionally realized by a memory in an original sound source module. As a result, the accent outputting effect of the digital piano is realized. The problem in the prior art that when a music score varies greatly and especially has strong accents, the music score cannot be played by existing digital pianos can be solved.
Description
Technical field
The present invention relates to a kind of digital piano, be specifically related to a kind of four foot-operated digital pianos and the method adding levant stress。
Background technology
In China, digital piano is referred to as " fender "。Digital piano digital technology (pulse code modulation scheme) replaces analogue technique, it is made not only to realize the imitation true to nature to tradition piano, there is the repertoire of mechanical piano, also there is the multiple tone color of uniqueness, storage memory, modified tone, audio mixing, beat function, and have midi interface, earphone (surrounding is not caused when playing after connecting sound pollution, is particularly suitable for practitioner), microphone interface etc., it is achieved that the combination of piano conventional art and modern high technology。
Digital piano, for traditional musical instrument, functionally has following feature:
1, source of sound is different
Traditional instrument is by mean of the means sounding such as object vibration, cavity resonance。Such as, stringed musical instrument, by pulling out string, string pulling or hitting string so as to vibrate, encourages organ for resonance sounding；Wind instrument is then by the air sounding of actuating cavity body；Various percussion instruments are excitation object sounding。The source of sound of all above traditional instrument all can be attributed to mechanical vibration sounding。Traditional instrument is unicity source of sound, and digital musical instrument is compound source of sound, and their principle of sound is essentially different。Traditional instrument, such as violin, flute etc., inherently a source of sound；And the repeating transmission of the multiple sound equipment of digital piano is all served as by speaker。
2, tone color is enriched
Digital piano is the product that modern digital electronic technology combines with act of music, and tone color and acoustics that it is abundant are decided by electronic technology means。Traditional instrument can only send single distinctive sound equipment, and digital piano then can produce the sound equipment of multiple music。One digital piano of good performance, has tens kinds to hundreds of analog sound, is equivalent to a no small band of battle array。
3, range is broad
Digital piano has very wide frequency spectrum, it is possible to the gamut of audition covered。Electronic percussion Frequency spectrum ratio conventional attack is happy wants width, it is possible to the requirement according to different class, produces the digital piano that range is different。
4, playing function is versatile and flexible
Digital piano passes through electrical switching apparatus, it is possible to play out blow, draw, bullet, pull out, the multiple sound equipment such as percussion instrument, humming。One digital piano of good performance, has tens kinds of playing functions。These functions are collocated with each other, it is possible to derive more sound equipment, it is possible to the acoustics of Zou Chu band。
5, sound equipment dynamic range is big
The audifier power of digital piano from tens milliwatts to tens watts, can carry out solo, accompaniment without public address equipment or add band performance in large-scale theater, dance hall。There are enough margins of power and sizable dynamic range due to digital piano, it is possible to describe effect softly fine and smoothly, the musical theme that imposing manner is magnificent can be represented again。
6, simulation creates multiple sound equipment
Digital piano can simulate the sound equipment of the traditional instrument such as wind instrument, string music, percussion music。Sound in all right natural imitation circle, as voice, chirping of birds, wind and rain sound, the report of a gun, train sound, blister sound, the frog cry etc., too numerous to enumerate。The peculiar sound equipment of illusion that modern digital piano also can not have in natural imitation circle, such as space sound equipment, describes the sound equipment of flying saucer, rocket, illusory fairyland, dreamland and dimly discernible, terrified sound equipment etc.。These sound equipments are immanent in art performance and video display sound equipment are recorded。
Current mechanical piano and digital piano are all three foot-operated pianos, and three foot-operated are respectively as follows: that off beat is foot-operated, select tenuto foot-operated and tenuto is ridden。Its function is: off beat is ridden, and after stepping on this pedal, sound can become softness, and volume diminishes。Selection tenuto is ridden, and only carries out desired sound using this pedal when lingering musical sound processes, during performance, steps on this pedal before finger does not leave pressed key, makes this sound produce lingering musical sound, after the sound played, after finger leaves keyboard, sound disappears immediately。Tenuto is ridden, and it is to make voice strip have lingering musical sound after than pedal stepping on。Although above-mentioned three foot-operated provide very big act skill to piano performance, but, when happy allusion quotation changed width very greatly time, when particularly stress is very strong, just cannot play, affect playing effect。
Summary of the invention
It is an object of the invention to provide a kind of four foot-operated digital pianos and the method adding levant stress, this digital piano can play out very strong stress effect, adopts the method can play out very strong stress effect。
The technical solution adopted for the present invention to solve the technical problems is: a kind of four foot-operated digital pianos, including body, key, qin control panel, the other plate of qin, qin foot, power supply, foot-operated box, described foot-operated box is sequentially provided with off beat foot step on, tenuto foot is selected to step on, tenuto foot is stepped on, described off beat foot is stepped on, tenuto foot is selected to step on, tenuto is foot-operated to be connected with sound source module by foot-operated interface circuit, described key, qin control panel is connected with sound source module, described power supply is power amplifier module and sound source module is powered, described foot-operated box is additionally provided with stress foot step on, described stress is foot-operated to be connected with sound source module by foot-operated interface circuit。
Further scheme is, described off beat is foot-operated, select tenuto to ride, tenuto is foot-operated, stress is foot-operated includes foot pedals respectively, foot pedals is connected with foot-operated base by foot-operated fore-stock, foot-operated after-poppet, between foot-operated fore-stock, foot-operated after-poppet, it is provided with foot switch circuit board, and foot switch circuit board is placed in below foot pedals；Described foot pedals has back-moving spring and foot switch is struck the post, and described back-moving spring is placed in foot-operated fore-stock；Described foot switch is struck the post and is placed in foot switch circuit board；The front end of foot pedals is connected with foot-operated after-poppet by rotating axle；
Foot switch circuit on foot switch circuit board is connected with foot-operated interface circuit。
Further scheme is, described foot switch is struck the post and is connected with the foot switch of foot switch circuit, and described foot switch is connected with foot-operated socket；
Described foot-operated interface circuit includes chip 4051, X5, X6, X7, X4 foot of chip 4051 foot-operated socket foot-operated with off beat, that selection tenuto is foot-operated, tenuto is foot-operated, stress is foot-operated respectively is connected, X4, X5, X6, X7 foot of chip 4051 is connected with power supply vcc respectively through resistance, and X, A, B, C foot of chip 4051 is connected with sound source module respectively；Power supply vcc is connected with the GND foot of chip 4051 by electric capacity C1, the GND foot ground connection of chip 4051, power supply vcc is connected with the Vcc foot of chip 4051, and the INH foot of chip 4051 is connected with X4, X5, X6, X7 foot of chip 4051 respectively through electric capacity C2, C3, C4, C5。
The present invention also provides for a kind of adopting above-mentioned four foot-operated digital pianos to carry out the method adding levant stress, and concrete operations are:
Pressing digital piano key, the source of sound processor chips of sound source module calculate the time difference pressing key；
Simultaneously, depress the foot pedals that stress is foot-operated, foot pedals is to rotate axle for the center of circle, move downward, the foot switch that foot switch under foot pedals is struck the post with foot switch circuit contacts, making foot switch close, foot switch closure signal passes sequentially through foot-operated socket, signal is passed to sound source module by foot-operated interface circuit；
Sound source module receives after stress rides the signal transmitted, and by time difference except 2, makes the key sound of key strengthen one times, and sound source module reads the true piano corresponding with key sound enhancing signal and records；Real piano stress recording data in the memorizer of sound source module extraction sound source module, and this recording data is combined with the recording of above-mentioned true piano, then the data of this combination are passed to power amplifier module to play out, power amplifier module broadcasts with the audio strengthening stress, what make that the sound that digital piano exports becomes is powerful and vigorous, truly interesting to listen to；
Unclamp the foot pedals that stress is foot-operated, back-moving spring is by foot pedals foot-operated for jack-up stress, the foot pedals that stress is ridden is to rotate axle for the center of circle, the foot-operated fore-stock of the arrival that moves up stops, return to original position, at this moment the foot switch that stress is foot-operated disconnects, and cut-off signal passes to sound source module by foot-operated socket, foot-operated interface circuit。Sound source module cancels stress acoustics signal, makes the acoustics that digital piano sends return to ortho states, and stress is strengthened terminating。
The pronunciation principle of digital piano is: several conductive rubber contacts arranged below in the centre of digital piano key。The plane of key and conductive rubber contact has an angle, and the height of these conductive rubber contacts is different, more high the closer to the conductive rubber contact of key rotating shaft。This angle and difference in height cause when key is pressed, and can first be pressed generation point cantact near the conductive rubber contact of key rotating shaft side, and the contact of the other end then can just can be pressed generation point cantact after a while。In the process that key is pressed, the electrical contact of two contacts can produce a time difference, and the most important thing is that the speed of the motion of this time difference and key is inversely proportional to, and the movement velocity of key is directly proportional to the dynamics (intensity of stress) of key sound。So, the point cantact time difference of two contacts is actually inversely proportional to the dynamics (intensity of stress) of key sound。Thus this physical quantity of the power being difficult to measure is become this physical quantity of time of easily measurement, thus the dynamics completing key sound is measured。The source of sound digital signal processor that time difference is sent into sound source module just can be used to control volume and the tone color of the pronunciation of the piano relevant with dynamics。Sound source module takes out the recording data of the true piano corresponding with this dynamics according to the dynamics signal that this time difference represents from memorizer, and this recording data is broadcasted by power amplifier module, it is possible to simulate audio very true to nature。Existing digital piano connects in mechanical piano the faint resonance that a key presses other string caused and can simulate out。Because those resonance are also all recorded really in the Recording Process of source of sound, all leave in the memorizer of sound source module。
The present invention adds a stress to ride on the basis of three original foot-operated digital pianos。Added stress foot-operated after, the principle being implemented in combination with stress effect with current existing digital piano ridden in stress: after the source of sound processor chips (process chip) of sound source module receive the foot-operated signal of stress from foot-operated interface circuit, first, the time difference pressing key is removed 2, thus the key sound of equivalence key pronunciation enhances one times, and namely the dynamics (intensity of stress) of this key enhances one times。Sound source module extracts true piano recording data corresponding with key sound enhancing signal in memorizer, sound source module extracts the true piano stress sound effects recording data corresponding with the foot-operated signal of stress simultaneously, and true piano recording data and true piano stress sound effects recording data are combined, then the data of this combination are passed to power amplifier module to play out, power amplifier module broadcasts with the audio strengthening stress, thus can realize truly interesting to listen to stress effect。And key its effect of each key has difference。The tens kinds of source of sound processor chips applied in the market can be easily achieved stress moveable endless。
The main reason adopting four foot-operated digital pianos is as follows:
1, up to the present, the foot-operated of digital piano still adopts mechanical piano pattern, i.e. three foot-operated patterns, and this pattern limits the development of digital piano。Four foot-operated digital pianos have broken the restriction of three foot-operated patterns, add the 4th for digital piano and ride, and the development for digital piano provides new interface；
2, four foot-operated digital pianos make increase and decrease stress more convenient operation, and when playing, stress changes with music change, and only foot coordinates finger manipulation, and each different note just can be made to send different stress acoustics；
3, four foot-operated digital pianos are played to digital piano and are provided very big act skill, and what make that performance audio becomes is powerful and vigorous, and sound equipment becomes more truly interesting to listen to；
4, four foot-operated digital pianos provide very big motility to musical composition, it is possible to make a width of music and weight change more greatly, make the creation of happy allusion quotation by the restriction of current musical instrument performance；
5, four foot-operated digital pianos provide new approach to the programming of digital piano source of sound and performance development。Can pass through to update the control mode of digital piano, create generation by generation new digital piano。
The beneficial effects of the present invention is:
The basis of original three foot-operated digital pianos adds a stress ride, the memorizer of former sound source module increases the recording of stress effect, digital piano is enable to export stress effect, solve existing digital piano when happy allusion quotation changed width very greatly time, when particularly stress is very strong, the problem just cannot played；
Adding stress effect, the audio making digital piano is more true to nature, more interesting to listen to；When using drum and number carrying out accompaniment and when double-tone plays, what can make that performance audio becomes is powerful and vigorous, and sound equipment becomes more truly interesting to listen to。
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the foot-operated digital piano of the present invention four；
Fig. 2 is the foot pedal structure front view of the foot-operated digital piano of the present invention four；
Fig. 3 is the foot pedal structure upward view of the foot-operated digital piano of the present invention four；
Fig. 4 is the foot pedal structure top view of the foot-operated digital piano of the present invention four；
Fig. 5 is the foot pedal structure side view of the foot-operated digital piano of the present invention four；
Fig. 6 is the foot-operated digital piano schematic block circuit diagram of the present invention four；
Fig. 7 is the foot switch circuit connection diagram with foot-operated interface circuit of the foot-operated digital piano of the present invention four。
In above-mentioned figure:
1, foot-operated base, 2, foot-operated after-poppet, 3, rotate axle, 4, foot-operated fore-stock, 5, foot pedals, 6, foot pedals set, 7, foot switch circuit board, 8, foot switch, 9, foot-operated socket, 10, back-moving spring, 11, pedal support fixes screw, 12, foot-operated adjustment Luo rod aperture, 13, Luo hole fixed by pedal, 14, screw fixed by foot switch circuit board, 15, foot switch is struck the post, 16, body, 17, key, 18, qin control panel, 19, the other plate of qin, 20, qin foot, 21, foot-operated box shell, 22, off beat foot is stepped on, 23, tenuto foot is selected to step on, 24, tenuto foot is stepped on, 25, stress foot is stepped on, 26, qin cover plate, 27, qin spectrum plate。
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated。Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention。
Referring to Fig. 1-Fig. 7, a kind of four foot-operated digital pianos, including body 16, key 17, qin control panel 18, the other plate 19 of qin, qin foot 20, power supply, foot-operated box shell 21；Body 16 is provided with qin cover plate 26 and qin spectrum plate 27, foot-operated box shell 21 be sequentially provided with off beat is foot-operated 22, select that tenuto is foot-operated 23, tenuto foot-operated 24 and stress foot-operated 25, off beat is foot-operated 22, select that tenuto is foot-operated 23, tenuto foot-operated 24 and stress foot-operated 25 are connected with sound source module with foot-operated interface circuit by foot switch circuit, key 17, qin control panel 18 are connected with sound source module, power supply is power amplifier module and sound source module is powered, and sound source module is connected with power amplifier module；
Off beat is foot-operated 22, select that tenuto is foot-operated 23, tenuto foot-operated 24 and stress foot-operated 25 include respectively overlapping with foot pedals 6 foot pedals 5, foot pedals 5 is connected (foot-operated fore-stock 4, foot-operated after-poppet 2 are connected by the fixing screw of pedal support 11 is fixing) with foot-operated base 1 by foot-operated fore-stock 4, foot-operated after-poppet 2 with foot-operated base 1, foot-operated base 1 is provided with the fixing Luo hole 13 of pedal and foot-operated adjustment Luo rod aperture 12, and foot-operated base 1 is fixed with foot-operated box shell 21 by screw rod through the fixing Luo hole 13 of pedal；The foot-operated Luo bar that regulates is contained in foot-operated adjustment Luo rod aperture 12, for regulating that off beat is foot-operated 22, select that tenuto is foot-operated 23, tenuto foot-operated 24 and stress foot-operated 25 be to the distance between ground, so that digital piano is applicable to all ages and classes layer, the use of different heights, improve the comfort of digital piano；Being provided with foot switch circuit board 7 between foot-operated fore-stock 4, foot-operated after-poppet 2, the fixing screw 14 of foot switch circuit board is connected through the bolt hole of foot switch circuit board 7 with foot-operated base 1, and foot switch circuit board 7 is placed in below foot pedals 5；Foot pedals 5 has back-moving spring 10 and foot switch strikes the post 15, and back-moving spring 10 is placed in foot-operated fore-stock 4；Foot switch is struck the post and 15 is placed in above foot switch circuit board 7, foot switch is struck the post 15 foot switchs 8 being connected with foot switch circuit, foot switch 8 is connected with foot-operated interface circuit by foot-operated socket 9, and foot switch 8 and foot-operated socket 9 are located on foot switch circuit board 7；The front end of foot pedals 5 is connected with foot-operated after-poppet 2 by rotating axle 3。After selecting off beat foot-operated, sound can become softness, and volume diminishes。Selection tenuto is ridden, and only desired sound is carried out lingering musical sound process, during performance, steps on this pedal before finger does not leave pressed key, makes this sound produce lingering musical sound, after the sound played, after finger leaves keyboard, sound disappears immediately。Voice strip is made to have lingering musical sound after selecting tenuto foot-operated。Selecting sound after stress pedal to become, strong tone becomes weight effectively, and volume becomes big, makes sound have stress effect。
Referring to Fig. 7, foot-operated interface circuit includes chip 4051, X5, X6, X7, X4, INH foot of chip 4051 respectively foot-operated with off beat, select the foot-operated socket CH1 that tenuto is foot-operated, tenuto is foot-operated, stress is foot-operated to be connected (foot-operated socket foot-operated with stress 25, off beat respectively is foot-operated 22, select that tenuto is foot-operated 23, tenuto is ridden foot switch K1, K2, K3, K4 of 24 and is connected), X4, X5, X6, X7 foot of chip 4051 is connected with power supply vcc respectively through resistance R1, R2, R3, R4, and X, A, B, C foot of chip 4051 is connected with sound source module respectively；Power supply vcc is connected with the GND foot of chip 4051 by electric capacity C1, the GND foot ground connection of chip 4051, power supply vcc is connected with the Vcc foot of chip 4051, and the INH foot of chip 4051 is connected with X4, X5, X6, X7 foot of chip 4051 respectively through electric capacity C2, C3, C4, C5。In figure, corresponding stress is foot-operated respectively, off beat is foot-operated, select tenuto foot-operated and tenuto is ridden for K1, K2, K3, K4。When depressing corresponding riding, inductive switch being closed, its closure signal gives the chip 4051 of foot-operated interface circuit by foot-operated socket。Giving source of sound processor chips by chip 4051 after being encoded again, source of sound processor chips call corresponding acoustics subprogram, complete the corresponding foot-operated acoustics sent。
The present invention adds on the basis of former three foot-operated digital pianos that a stress is foot-operated, stress input control signal, digital piano stress sound effects recording data, and change the sound source module acoustic program of control, allow digital piano send controlled stress acoustics。Its operation principle is: when depressing stress and being foot-operated, the foot pedals that stress is ridden is to rotate axle for the center of circle, move down, at this moment the foot switch under foot pedals is struck the post the foot switch being pressed onto on foot switch circuit board, foot switch is made to close, foot switch closure signal delivers to foot-operated interface circuit by the foot-operated socket on foot switch circuit board, this signal is passed to the sound source module of digital piano by foot-operated interface circuit, sound source module is made to send stress acoustics signal to power amplifier module, strengthen the sound equipment sound simultaneously, make the sound that digital piano exports, what become is powerful and vigorous, truly interesting to listen to。When unclamping stress and being foot-operated, back-moving spring is by jack-up foot pedals, and foot pedals is to rotate axle for the center of circle, and the foot-operated fore-stock of the arrival that moves up stops, and returns to original position。At this moment foot switch disconnects, and cut-off signal passes to the sound source module of digital piano。Sound source module cancels stress acoustics signal, makes the acoustics that digital piano sends return to ortho states。
The foot-operated i.e. off beat of other three of digital piano is foot-operated, select the foot-operated operation principle foot-operated with tenuto of tenuto and work process the same with three original foot-operated digital pianos, retaining original structure, former workflow, mode of operation, it is constant that its acoustics retains ortho states。
The present invention also provides for a kind of adopting above-mentioned four foot-operated digital pianos to carry out the method adding levant stress, and concrete operations are:
Pressing digital piano key, the source of sound processor chips (sound source chip) of sound source module calculate the time difference pressing key；
Simultaneously, depress the foot pedals that stress is foot-operated, foot pedals is to rotate axle for the center of circle, move downward, the foot switch that foot switch under foot pedals is struck the post with foot switch circuit contacts, making foot switch close, foot switch closure signal passes sequentially through foot-operated socket, signal is passed to sound source module by foot-operated interface circuit；
Sound source module receives after stress rides the signal transmitted, and by time difference except 2, makes the key sound of key strengthen one times, and sound source module reads the true piano corresponding with key sound enhancing signal and records；Real piano stress recording data in the memorizer of sound source module extraction sound source module, and this recording data is combined with the recording of above-mentioned true piano, then the data of this combination are passed to power amplifier module to play out, power amplifier module broadcasts with the audio strengthening stress, what make that the sound that digital piano exports becomes is powerful and vigorous, truly interesting to listen to；
Unclamp the foot pedals that stress is foot-operated, back-moving spring is by foot pedals foot-operated for jack-up stress, the foot pedals that stress is ridden is to rotate axle for the center of circle, the foot-operated fore-stock of the arrival that moves up stops, return to original position, at this moment the foot switch that stress is foot-operated disconnects, and cut-off signal passes to sound source module by foot-operated socket, foot-operated interface circuit。Sound source module cancels stress acoustics signal, makes the acoustics that digital piano sends return to ortho states, and stress is strengthened terminating。
In the present invention, sound source module is actually a microcomputer, and it, by receiving keyboard signal, control signal and foot-operated signal, calculates and synthesize corresponding acoustics, give power amplifier module, then sent the sound by the loudspeaker of power amplifier module。The stress acoustics that digital piano stress is foot-operated, can arbitrarily can set in one to five times。
It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to claims of the present invention。
Claims (4)
1. a foot-operated digital piano, including body, key, qin control panel, the other plate of qin, qin foot, power supply, foot-operated box, described foot-operated box is sequentially provided with off beat foot step on, tenuto foot is selected to step on, tenuto foot is stepped on, described off beat foot is stepped on, tenuto foot is selected to step on, tenuto is foot-operated to be connected with sound source module by foot-operated interface circuit, described key, qin control panel is connected with sound source module, described power supply is power amplifier module and sound source module is powered, it is characterized in that: described foot-operated box is additionally provided with stress foot and steps on, described stress is foot-operated to be connected with sound source module by foot-operated interface circuit。
2. four foot-operated digital pianos according to claim 1, it is characterized in that: described off beat is foot-operated, select tenuto to ride, tenuto is foot-operated, stress is foot-operated includes foot pedals respectively, foot pedals is connected with foot-operated base by foot-operated fore-stock, foot-operated after-poppet, between foot-operated fore-stock, foot-operated after-poppet, it is provided with foot switch circuit board, and foot switch circuit board is placed in below foot pedals；Described foot pedals has back-moving spring and foot switch is struck the post, and described back-moving spring is placed in foot-operated fore-stock；Described foot switch is struck the post and is placed in foot switch circuit board；The front end of foot pedals is connected with foot-operated after-poppet by rotating axle；
Foot switch circuit on foot switch circuit board is connected with foot-operated interface circuit。
3. four foot-operated digital pianos according to claim 2, it is characterised in that: described foot switch is struck the post and is connected with the foot switch of foot switch circuit, and described foot switch is connected with foot-operated socket；
Described foot-operated interface circuit includes chip 4051, X5, X6, X7, X4 foot of chip 4051 foot-operated socket foot-operated with off beat, that selection tenuto is foot-operated, tenuto is foot-operated, stress is foot-operated respectively is connected, the X4 of chip 4051,5, X6, X7 foot be connected with power supply vcc respectively through resistance, X, A, B, C foot of chip 4051 is connected with sound source module respectively；Power supply vcc is connected with the GND foot of chip 4051 by electric capacity C1, the GND foot ground connection of chip 4051, power supply vcc is connected with the Vcc foot of chip 4051, the INH foot of chip 4051 respectively through electric capacity C2, C3, C4, C5 and the X4 of chip 4051,5, X6, X7 foot is connected。
4. one kind adopts the method that in claim 1-3, arbitrary four described foot-operated digital pianos carry out adding levant stress, it is characterised in that comprising the steps: to press digital piano key, the source of sound processor chips of sound source module calculate the time difference pressing key；
Simultaneously, depress the foot pedals that stress is foot-operated, the foot pedals moving axis that rotates moves downward, the foot switch that foot switch under foot pedals is struck the post with foot switch circuit contacts, making foot switch close, foot switch closure signal passes sequentially through foot-operated socket, signal is passed to sound source module by foot-operated interface circuit；
Sound source module receives after stress rides the signal transmitted, and by time difference except 2, makes the key sound of key strengthen one times, and sound source module reads the true piano corresponding with key sound enhancing signal and records；Real piano stress recording data in the memorizer of sound source module extraction sound source module, and this recording data is combined with the recording of above-mentioned true piano, then the data of this combination being passed to power amplifier module to play out, power amplifier module broadcasts with the audio strengthening stress；
Unclamping the foot pedals that stress is foot-operated, foot pedals is homing under the effect of back-moving spring, and stress is strengthened terminating。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108873095A (en) * | 2018-07-26 | 2018-11-23 | 广州市雅迪数码科技有限公司 | Piano key acts self-adapting detecting circuit |
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| CN110618601A (en) * | 2019-09-27 | 2019-12-27 | 郑州工程技术学院 | Metronome is used in music teaching |
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