CN104835485A - Piano sampling and playing device, and key calibration method thereof, and key signal sampling method - Google Patents
Piano sampling and playing device, and key calibration method thereof, and key signal sampling method Download PDFInfo
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- CN104835485A CN104835485A CN201510163688.XA CN201510163688A CN104835485A CN 104835485 A CN104835485 A CN 104835485A CN 201510163688 A CN201510163688 A CN 201510163688A CN 104835485 A CN104835485 A CN 104835485A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B15/00—Teaching music
- G09B15/08—Practice keyboards
Abstract
The invention provides a piano sampling and playing device, and a key calibration method thereof, and a key signal sampling method. The device comprises a test rod, and a master control unit. The test rod is internally provided with a plurality of key detection units which are connected in a communication manner. Each piano key is divided into a plurality of parts. Each key detection unit is corresponding to one part. The key detection unit comprises first sensors adhered to each key in a one-to-one correspondence manner and used to detect displacement of each key in playing and generate a corresponding key sampling signal, a key signal processor connected with the first sensors in a communication manner, a plurality of LED indicating lamps exposed out of the housing of the test rod. The LED indicating lamps are arranged respectively corresponding to each key, and are connected with the key signal processor in a communication manner. The master control unit is connected with at least a key detection unit in a communication manner and is connected with a network terminal in a communication manner. The piano sampling and playing device accurately recognizes key pressing positions of a player, and realizes through an external device, and the device can be used for a conventional piano. The device can connect with a network to obtain resources.
Description
Technical field
The present invention relates to music teaching technical field, particularly relate to a kind of piano and adopt broadcasting device and key calibration steps thereof and key signal sampling method.
Background technology
Present promotion all things on earth is all networked, and network technology more gos deep into each corner of our life, and traditional piano lacks a bridge connected to the network.Although and at present fender has on the market had certain mode in interconnection network, fender has been that pure electroacoustic occurs, thus on the fidelity of feel and tonequality and traditional piano still have very large gap.In addition for piano, dynamics scoring product external at present does not also have, to the photoelectric sensor being built in the use of piano inspecting force product, but when installing, existing piano system must be taken apart, and need to have measured detecting distance and screw is fixed, relative complex is installed, have certain structural failure to piano, a lot of user cannot accept.If be placed on outermost sensors due to the environment detected inconsistent, and changeable, unstable, be subject to the interference of sunray, finally cause the dynamics that gathers inaccurate or do not collect dynamics.In addition, owing to installing line more complicated, the detection of pedal signal is often left in the basket, and the collection that the information causing user to play the musical instrument like this cannot be complete retains.
Summary of the invention
The shortcoming of prior art in view of the above, a kind of piano is the object of the present invention is to provide to adopt broadcasting device and key calibration steps thereof and key signal sampling method, be arranged at traditional piano and can realize teaching, overcome the many disadvantages that in prior art, fender exists.
For realizing above-mentioned target and other related objectives, the invention provides a kind of piano and adopt broadcasting device, comprise: be erected at the reference test bar above piano key, inside be provided with multiple key detecting units that communication is connected, wherein, each described piano key is divided into multiple part, and each key detecting unit correspondence is wherein a part of; Described key detecting unit, it comprises: the first sensor be arranged on each key of fitting correspondingly, generates corresponding button sampled signal for detecting the displacement of each key when playing; Communicate to connect the key signal processor of each first sensor; Expose to multiple LED light that described reference test bar housing is arranged, correspond respectively to each described position of piano key and arrange, and being communicatively connected to described key detecting unit; Main control unit, is communicatively coupled to wherein at least one key detecting unit and be communicatively coupled to the network terminal.
Optionally, described first sensor is non-contacting sensor, comprising: the one in photoelectric sensor and magnetoelectric transducer; Or described first sensor is touch sensor, by be located at the contact conducting resinl that arranges of conducting resinl key surface and obtain described button sampled signal.
Optionally, described main control unit comprises: primary processor, is communicatively coupled to a wherein key detecting unit, generates midi signal according to the button sampled signal that each described key detecting unit sends; Sound source module, connects described primary processor and is connected with digital to analog converter, generates I2S sound source signal and change into simulated audio signal through described digital to analog converter to export according to described midi signal; Display screen, is communicatively coupled to described primary processor; Touch key-press module, is communicatively coupled to described primary processor; Power supply adaptor, is connected to external power source; Wireless communication module, with described network terminal wireless connections.
Optionally, described main control unit also comprises: be connected to described sound source module and be connected with the Bluetooth audio frequency transmitter module of antenna.
Optionally, broadcasting device adopted by described piano, comprising: the second sensor being located at piano step, and the signal wireless of described second sensor collection transfers to described main control unit.
Optionally, described second sensor is angular transducer; Described second sensor is positioned in piano step and arranges to balance pivot both sides each other with foot-operated position.
Optionally, the communication connection between described main control unit and key detecting unit is wired connection, comprising: the one during midi interface connection and midi interface connect; Or the communication connection between described main control unit and key detecting unit is wireless connections, comprising: blue tooth interface connects.
Optionally, the described network terminal comprises: one or more combinations in the mobile phone of accessing Internet, panel computer, notebook computer and desktop computer.
Optionally, each described LED light one_to_one corresponding is in each key, and each described LED light is double-colored.
Optionally, described main control processor according to the educational instruction from the described network terminal to control the instruction of described LED light.
For realizing above-mentioned target and other related objectives, the invention provides and be a kind ofly applied to the key calibration steps that broadcasting device adopted by described piano, comprise: respectively the first sensor that it comprises is calibrated by key detecting unit, described calibration comprises: step 11: when pressing each key, the transmitting terminal of enable each first sensor also regulates the PWM value of transmitting terminal by predetermined manner, obtain the current button sampled signal values of the receiving end of described first sensor after adjustment; Step 12: judge whether key is pressed to bottom; Step 13: if so, current button sampled signal values is saved as by bottom standard value, and judge whether described current button sampled signal values is greater than a setting value, and when result is for being, regulated PWM value is saved as PWM standard value; Described method also comprises: circulation performs step 11 ~ 13, until each described first sensor all saves by when to bottom standard value and PWM standard value, what the button sampled signal values obtained after time delay Preset Time is saved as corresponding key lifts lifts standard value.
For realizing above-mentioned target and other related objectives, the invention provides and be a kind ofly applied to the key signal sampling method that broadcasting device adopted by described piano, comprise: step 21: the current button sampled signal obtaining described key detecting unit, and when being provided with the first ident value that corresponding key presses and pressing standard value, judge current button sampled signal values presses standard value to judge whether key is pressed described in whether being greater than; Step 22: press key if be judged as, first ident value is composed true value, and when being set with corresponding key and being pressed to the second ident value of bottom and being pressed to bottom standard value, judge currently whether to meet the key preset and be pressed to bottom condition, wherein, described key is pressed to bottom condition and comprises: be pressed to bottom standard value and the first ident value is true described in current button sampled signal values is greater than; Step 23: if meet key to be pressed to bottom condition, send key by key detecting unit and press signal to described main control unit, and described second ident value is composed true value, wherein, described key is pressed signal and is comprised: the key assignments of key and key are from the representative value being pressed to the time arriving bottom; Step 24: do not press key if be judged as, when be set with that corresponding key lifts lift standard value, judge currently whether to meet the key preset and lift condition, wherein, described key lifts condition and comprises: described first ident value and the second ident value for true and current button sampled signal values be less than described in lift standard value; Step 25: if meet key to lift condition, be then sent to described main control unit by the key assignments of the corresponding key of key detecting unit transmission key, and described first ident value and the second ident value reset; Described method also comprises: circulation performs described step 21 ~ step 25 until receive circulation stop signal.
In sum, the invention provides a kind of piano and adopt broadcasting device and key calibration steps thereof and key signal sampling method, comprise: be erected at the reference test bar above piano key, inside be provided with multiple key detecting units that communication is connected, wherein, each described piano key is divided into multiple part, and each key detecting unit correspondence is wherein a part of; Described key detecting unit, it comprises: the first sensor be arranged on each key of fitting correspondingly, generates corresponding button sampled signal for detecting the displacement of each key when playing; Communicate to connect the key signal processor of each first sensor; Expose to multiple LED light that described reference test bar housing is arranged, correspond respectively to each described position of piano key and arrange, and being communicatively connected to described key detecting unit; Main control unit, is communicatively coupled to wherein at least one key detecting unit and be communicatively coupled to the network terminal; The present invention can identify the chain shot position of the person of playing the musical instrument accurately, and is realized by the external device not changing the structure of existing piano as far as possible, and can be connected to network, and whole system seems more succinct; And the digital audio processor of high-quality can be adopted, also original sound that can be true to nature, with in the process of playing user, provides the accompaniment of a high-quality, to improve the interest that user plays melody.
Accompanying drawing explanation
Fig. 1 is shown as the module diagram that broadcasting device adopted by piano in one embodiment of the invention,
Fig. 2 is shown as the module diagram of key detecting unit in one embodiment of the invention.
Fig. 3 is shown as the structural representation of reference test bar in one embodiment of the invention.
Fig. 4 is shown as the partial circuit principle schematic of key detecting unit in one embodiment of the invention.
Fig. 5 is shown as the module diagram of main control unit in one embodiment of the invention.
Fig. 6 is shown as the structural representation of main control unit in one embodiment of the invention.
Fig. 7 is shown as in one embodiment of the invention and is applied to the schematic flow sheet that the key calibration steps of broadcasting device adopted by piano.
Fig. 8 is shown as in one embodiment of the invention and is applied to the schematic flow sheet that the key signal sampling method of broadcasting device adopted by piano.
Element numbers explanation
1 key
2 reference test bars
21 key detecting units
211 first sensors
212 key signal processors
22 LED light
3 main control units
31 primary processors
32 sound source module
33 digital to analog converters
34 display screens
35 touch key-press modules
36 power supply adaptors
37 wireless communication modules
38 Bluetooth audio frequency transmitter modules
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Broadcasting device adopted by piano provided by the present invention, can be applicable to traditional piano, use when not affecting traditional piano original structure as far as possible, there is the marketable value of widespread use, and jump out the thinking that can only be realized communications in idea in the past by these class substitute products of fender.
As shown in Figure 1, broadcasting device adopted by piano provided by the present invention, comprising: be set up in reference test bar 2 on piano key 1 and main control unit 3 etc., is provided with multiple key detecting units 21 that communication is connected in described reference test bar 2.
As shown in Figure 2, each described key detecting unit 21, comprising: multiple first sensor 211, key signal processor 212 and LED light 22; In one embodiment, piano key comprises black and white two kinds of buttons and amounts to 88, then corresponding first sensor 211 also one_to_one corresponding has 88, and each described first sensor 211 is for detecting the displacement of each key when playing (press and lift action produce) the corresponding button sampled signal of generation; Preferably, described first sensor 211 comprises signal transmitting terminal and receiving end, and each described first sensor 211 can be set to fit correspondingly and be arranged on each key 1, ensures that signal can not by external interference like this, if photoelectric sensor, then can greatly reduce extraneous light interference.
See also Fig. 3, described first sensor 211 can be embedded in reference test bar 2 and to arrange towards key, and its transmitting terminal transmits to corresponding key, delivers to receiving end and receives, produce transducing signal and button sampled signal according to distance after key reflection; As shown in the figure, for distinguishing black, white key, correspondence is black, the position of the first sensor 211 of Bai Jian can be different, the first sensor 211 of all corresponding black keys is positioned at same plane, the first sensor 211 of the white key of all correspondences is positioned at same plane, have range difference between two planes (A, B plane such as shown in Fig. 2), then button sampled signal values also has larger difference, can be used for distinguishing black key or white key.
In one embodiment, preferably, described first sensor 211 is non-contacting sensor, comprising: the one in photoelectric sensor and magnetoelectric transducer, and the design of non-contacting sensor can retain the feel of traditional piano to greatest extent; Or described first sensor 211 is touch sensor, by be located at the contact conducting resinl that arranges of conducting resinl key surface and obtain described button sampled signal.
Described key signal processor 212, communicate to connect each first sensor 211, it can be single-chip microprocessor MCU, and it can realize comprising: control the display etc. that first sensor 211 scans key (i.e. push button signalling sampling) and described LED light 22.
Again as shown in Figure 3, described LED light 22 has multiple set by each described position of piano key of one_to_one corresponding, and exposes to described reference test bar 2 housing, and each described LED light 22 is communicatively connected to described key signal processor 212; Preferably, each described LED light 22 can be double-colored, is used to indicate corresponding key and such as left hand or the right hand should be adopted to play, and this can in follow-up explanation.
In one embodiment, preferably, each described piano key is divided into multiple part, and each key detecting unit 21 correspondence is wherein a part of, greatly can improve the precise degrees of scanning like this; For example, piano has 88 keys, and preferred key detecting unit 21 can arrange 4, and wherein 3 control signals collecting or the instruction transmitting-receiving of 24 keys separately, other 1 then corresponding signals collecting or instruction transmitting-receiving controlling remaining 16 keys, controls compared to a key detecting unit 21; , connected by the Serial Communication at High Speed on MS such as such as USB3.0 between each key detecting unit 21 meanwhile, also solve the problem of sensor consistency problem between each key detecting unit 21 and high-speed transfer demand; It should be noted that, the quantity that piano key divides multiple part is not limited with above-mentioned.
As shown in Figure 4, illustrate the circuit realiration of each key detecting unit 21, in the present embodiment, first sensor 211 is one group with 4, show only two groups in figure, but this type of can be pushed into the circuit structure of the key detecting unit 21 comprising 16 or 24 first sensors 211.
In the present embodiment, U6 is the chip containing 2 2-4 code translators, for the control of first sensor transmitting terminal; U24 contains the analog switch that 24 are selected 1, for the switching of first sensor 211 receiving end signal; First sensor 4 one group, U15 ~ U18 mono-group, corresponding A IN6; U19 ~ U22 mono-group, corresponding A IN7; U6 control end A and U24 control end 2A is connected to ROW0, and U6 control end B and U24 control end 2B is connected to ROW1.
Concrete, in 2 groups, the first sensor of correspondence position switches simultaneously, and AIN6, AIN7 are outputed signal simultaneously; Suppose, RPOUT_EN=0, ROW0=0, ROW1=0, so sensor U18, U22 transmitting terminal is effective, and sensor is started working, and receiving end has corresponding signal; As RPIN_EN=0, AIN6, AIN7 signal is the ohmically signal of corresponding U18, U22 receiving end respectively; In the present embodiment, U24 adopts and 4 selects 1 analog switch, can adopt 2 tunnel independence AD controllers in U6 chip, and the time delay of AD controller switching time can be avoided like this on the impact of whole sweep time as far as possible.
Described main control unit 3, is communicatively coupled to wherein at least one key detecting unit 21 and be communicatively coupled to the network terminal.In one embodiment, the described network terminal comprises: the mobile phone of accessing Internet, panel computer, notebook computer, and one or more combinations in desktop computer, described main control processor according to the educational instruction from the described network terminal to control the instruction of described LED light 22, illustrate, the described network terminal can run Piano Teaching software, and send educational instruction to main control unit 3, main control unit 3 may correspond to and generates educational instruction to key detecting unit 21, to control the corresponding light instruction key mapping of LED light 22 and left or right hand is played, study for reference, so just can by the Piano Teaching resource of Network Capture magnanimity, and more traditional mode of learning obtains huge improved efficiency, and add interest for uninteresting piano study.
Communication connection between described main control unit 3 and key detecting unit 21 is wired connection, comprising: the one during midi interface connection and midi interface connect; Or, communication connection between described main control unit 3 and key detecting unit 21 is wireless connections, comprise: bluetooth connection, WIFI, Zigbee or other connections etc., if wireless connections, then described key detecting unit 21 also needs to comprise the wireless module being electrically connected described key signal processor 212, preferably works in 433Mhz frequency range.
In one embodiment, as shown in Figure 5, described main control unit 3 comprises:
Primary processor 31, is communicatively coupled to a wherein key detecting unit 21 by such as communication module etc., generates midi signal according to the button sampled signal that each described key detecting unit 21 sends.
Sound source module 32, connect described primary processor 31 and be connected with digital to analog converter 33 (DAC), generate I2S sound source signal according to described midi signal and change into simulated audio signal through described digital to analog converter 33 and export, listen to for loudspeaker broadcasting or earphone, the digital audio processor of high-quality can be adopted, also original sound that can be true to nature, by this audio frequency process, in the process can played user, provide the accompaniment of a high-quality, to improve the interest that user plays melody.
Display screen 34, is communicatively coupled to described primary processor 31, and be preferably 8bit transmission line, described display screen 34 is preferably color LCD or LED screen.
Touch key-press module 35, is communicatively coupled to described primary processor 31 by such as I/O interface etc.; The button that described touch key-press module 35 connects can be close to described display screen 34 and be arranged at the shell of main control unit 3.
Power supply adaptor 36, is connected to external power source and transforms such as 12V and power to main control unit 3.
Wireless communication module 37, with described network terminal wireless connections; Described wireless communication module 37 is such as bluetooth, WiFi or other wireless modules, is preferably bluetooth BLE4.0 module.
In one embodiment, described main control unit 3 also comprises: be connected to described sound source module and be connected with the Bluetooth audio frequency transmitter module 38 of antenna, facilitating user to use bluetooth earphone listening to audio, and be not limited only to wired connection.The main control unit 3 provided in the embodiment of composition graphs 5, as shown in Figure 6, be the schematic top plan view of Fig. 3, main control unit 3 can be made panel-form and be fixed on the side of reference test bar 2, and the setting that faces up, the setting of functional parameter is carried out for user.
In one embodiment, broadcasting device adopted by described piano, also comprises: the second sensor being located at piano step, and the signal wireless of described second sensor collection transfers to described main control unit 3.In one embodiment, described second sensor is angular transducer; Described second sensor is positioned in piano step and arranges to balance pivot both sides each other with foot-operated position, specifically, piano step is that lever realizes, if pin leaves after depressing, can resilience, therefore the opposite side that can be lever both sides at the foot-operated end of relative piano step arranges angular transducer, in order to gather the angle of the current relative reference plane of step, thus judge whether step depresses, and also the wireless module be electrically connected with described angular transducer can be arranged at step simultaneously, send transducing signal to main control unit 3 by wireless module.
In order to use more accurately, when user uses first time, keyboard calibration can be carried out, so that signals collecting afterwards can be more accurate.
As shown in Figure 7, the invention provides and be a kind ofly applied to the key calibration steps that broadcasting device adopted by described piano, comprise: respectively the first sensor that it comprises is calibrated by key detecting unit, in one embodiment, described calibration can send enabled instruction by main control unit and complete by key detecting unit, and described calibration comprises:
Step S11: judge whether to reach the pre-determined number performing described key calibration steps; If not, then step S12 is proceeded to; If so, then step S17. is proceeded to
In one embodiment, key quantity is calibrated below execution the cycle index of content, that is, the complete then first sensor that all keys are corresponding that circulates calibration is complete; For example, as previously mentioned, 88 keys, divide by 24,24,24 and 16 four parts, wherein control the key detecting unit of 24 keys sampling then containing 24 first sensors, if be the division of a group by 4 first sensors in earlier figures 4, then have 6 groups, described key detecting unit can be calibrated 6 groups of 4 first sensors simultaneously, then 4 times namely adjustable is complete only to need circulation; Certainly this is preferred parallel detecting method, in other embodiments, also can adopt one by one to the mode that first sensor is calibrated, therefore the key quantity etc. that described pre-determined number can be divided in multiple group with the quantity of key quantity, key detecting unit institute control section key or key detecting unit institute control section key is associated, but not as limit; Further, each key detecting unit separately also can executed in parallel to the operation of comprised first sensor calibration, and for example, 3 key detecting units of corresponding scanning 24 keys can calibrate complete 72 first sensors simultaneously.
And in order to distinguish each key, the equal correspondence of each key has " key assignments " of its uniqueness of mark.
Step S12: if do not reach, when pressing each key, the transmitting terminal of enable each first sensor also regulates the PWM value of transmitting terminal by predetermined manner, obtain the current button sampled signal values of the receiving end of described first sensor after adjustment.
In one embodiment, described adjustment can be such as regulate PWM value (current value) step by step by present count value gear, and the current button sampled signal values after the adjustment of each detection receiving end, preferably, think when can reach an enough large predetermined value between the black key obtained and the button sampled signal values of Bai Jian and regulate complete, being also used for of presetting can be identified the PWM home position whether PWM identified is true value (1); Described button sampled signal values can be AD value, i.e. analog to digital conversion, represents the current value of corresponding mimic channel or the size of magnitude of voltage by digital quantity.
Step S13: judge whether key is pressed to bottom; If so, then step S14 is proceeded to; If not, then step S11 is got back to
In one embodiment, the change in displacement of relative first sensor can be produced when key is pressed, the button sampled signal values that then first sensor receiving end exports changes equally, when the button sampled signal values gathered when displacement reaches maximum reaches a ultimate value (maximum or minimum value), then can think that button is to bottom.
Step S14: current button sampled signal values is saved as by bottom standard value;
Step S15: judge whether described current button sampled signal values is greater than a setting value; If so, then step S16 is performed; If not then, then step S11 is got back to;
Step S16: regulated PWM value is saved as PWM standard value and jump procedure S11.Preferably, in one embodiment, now, being also used for of presetting can be identified the PWM home position whether PWM identified is true value (1).
Step 17: if step S11 judges to reach preset times, then represent that each described first sensor all saves by bottom standard value and PWM standard value, then what the button sampled signal values obtained after time delay Preset Time is saved as that corresponding key lifts lifts standard value.
In one embodiment, described Preset Time is such as 2 seconds; And it is preferred, each standard value of preserving in step S11 ~ S17 all can only be written in buffer memory, when the standard value that all keys are corresponding is all stored in buffer memory, then be stored in Flash, use for system calibration next time (being namely equivalent to initialization).
Preferred in addition, when do not receive jump out cycle signal (break), step S11 ~ S17 is in circulation always, jumps out cycle signal until receive, then jumping out circulation and terminating calibration process.
As shown in Figure 8, the present invention also provides a kind of and is applied to the key signal sampling method that broadcasting device adopted by described piano, namely the push button signalling sampling under the normal service condition of piano is applied to, specifically, preferably, signal acquisition method in Fig. 7 embodiment can hookup 6 embodiment signal key calibration steps use, certainly, in other embodiments, described signal acquisition method also can be applied separately, only need each standard value pre-set, not as limit.
Described key signal sampling method comprises:
Step S21: the current button sampled signal obtaining described key detecting unit;
Step S22: when being provided with the first ident value that corresponding key presses and pressing standard value, judge current button sampled signal values presses standard value to judge whether key is pressed described in whether being greater than; If so, then step S23 is proceeded to; If not, then step S25 is proceeded to
Step S23: if be greater than, then be judged as pressing key, first ident value is composed true value (1), and when being set with corresponding key and being pressed to the second ident value of bottom and being pressed to bottom standard value, judge currently whether to meet the key preset and be pressed to bottom condition, wherein, described key is pressed to bottom condition and comprises: be pressed to bottom standard value and the first ident value is true described in current button sampled signal values is greater than; If meet, then proceed to step S24; If do not meet, then proceed to step S25;
Step S24: send key by key detecting unit and press signal to described main control unit, and described second ident value is composed true value, wherein, described key is pressed signal and comprised: the key assignments of key and key are from the representative value being pressed to the time arriving bottom.
In one embodiment, described representative value replaces by count value, and this is conventional means, for example, the counting of predetermined time interval is carried out when the described method of sampling starts, when being judged as pressing key in described step S22, record the first count value Count1, and when step S23 be judged as pressing key on earth, record the second count value Count2, the time that button presses can be indicated according to the difference (Count=Count2-Count1) of the second count value and the first count value, and further, if the time is shorter, illustrate that keystroke dynamics is stronger, therefore, in other embodiments, the key signal sampling method that present patent application provides also can continue and judges or calculate the step of keystroke dynamics.
Step S25: when be set with that corresponding key lifts lift standard value, judge currently whether to meet the key preset and lift condition, wherein, described key lifts condition and comprises: described first ident value and the second ident value for true and current button sampled signal values be less than described in lift standard value; If meet, then proceed to step S26; If do not meet, then terminate this sampling.
Step S26: the key assignments being sent the corresponding key of key by key detecting unit is sent to described main control unit, and described first ident value and the second ident value is reset.
In one embodiment, preferably, now also the clearing of Count value can be sent to main control unit.
Preferably, the same execution capable of circulation of described step S21 ~ S26, until stop after receiving circulation stop signal.
In sum, the invention provides a kind of piano and adopt broadcasting device and key calibration steps thereof and key signal sampling method, comprise: be erected at the reference test bar above piano key, inside be provided with multiple key detecting units that communication is connected, wherein, each described piano key is divided into multiple part, and each key detecting unit correspondence is wherein a part of; Described key detecting unit, it comprises: the first sensor be arranged on each key of fitting correspondingly, generates corresponding button sampled signal for detecting the displacement of each key when playing; Communicate to connect the key signal processor of each first sensor; Expose to multiple LED light that described reference test bar housing is arranged, correspond respectively to each described position of piano key and arrange, and being communicatively connected to described key detecting unit; Main control unit, is communicatively coupled to wherein at least one key detecting unit and be communicatively coupled to the network terminal; The present invention can identify the chain shot position of the person of playing the musical instrument accurately, and is realized by the external device not changing the structure of existing piano as far as possible, and can be connected to network, and whole system seems more succinct; And the digital audio processor of high-quality can be adopted, also original sound that can be true to nature, with in the process of playing user, provides the accompaniment of a high-quality, to improve the interest that user plays melody.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (12)
1. a broadcasting device adopted by piano, it is characterized in that, comprising:
Be erected at the reference test bar above piano key, be inside provided with multiple key detecting units that communication is connected, wherein, each described piano key is divided into multiple part, and each key detecting unit correspondence is wherein a part of;
Described key detecting unit, it comprises:
The first sensor that laminating is correspondingly arranged on each key, generates corresponding button sampled signal for detecting the displacement of each key when playing;
Communicate to connect the key signal processor of each first sensor;
Expose to multiple LED light that described reference test bar housing is arranged, correspond respectively to each described position of piano key and arrange, and being communicatively connected to described key detecting unit;
Main control unit, is communicatively coupled to wherein at least one key detecting unit and be communicatively coupled to the network terminal.
2. broadcasting device adopted by piano according to claim 1, it is characterized in that, described first sensor is non-contacting sensor, comprising: the one in photoelectric sensor and magnetoelectric transducer; Or described first sensor is touch sensor, by be located at the contact conducting resinl that arranges of conducting resinl key surface and obtain described button sampled signal.
3. broadcasting device adopted by piano according to claim 1, it is characterized in that, described main control unit comprises:
Primary processor, is communicatively coupled to a wherein key detecting unit, generates midi signal according to the button sampled signal that each described key detecting unit sends;
Sound source module, connects described primary processor and is connected with digital to analog converter, generates I2S sound source signal and change into simulated audio signal through described digital to analog converter to export according to described midi signal;
Display screen, is communicatively coupled to described primary processor;
Touch key-press module, is communicatively coupled to described primary processor;
Power supply adaptor, is connected to external power source;
Wireless communication module, with described network terminal wireless connections.
4. broadcasting device adopted by piano according to claim 3, it is characterized in that, described main control unit also comprises: be connected to described sound source module and be connected with the Bluetooth audio frequency transmitter module of antenna.
5. broadcasting device adopted by piano according to claim 3, it is characterized in that, comprising: the second sensor being located at piano step, and the signal wireless of described second sensor collection transfers to described main control unit.
6. broadcasting device adopted by piano according to claim 5, it is characterized in that, described second sensor is angular transducer; Described second sensor is positioned in piano step and arranges to balance pivot both sides each other with foot-operated position.
7. broadcasting device adopted by piano according to claim 1, it is characterized in that, the communication connection between described main control unit and key detecting unit is wired connection, comprising: the one during midi interface connection and midi interface connect; Or the communication connection between described main control unit and key detecting unit is wireless connections, comprising: blue tooth interface connects.
8. broadcasting device adopted by piano according to claim 1, it is characterized in that, the described network terminal comprises: one or more combinations in the mobile phone of accessing Internet, panel computer, notebook computer and desktop computer.
9. broadcasting device adopted by piano according to claim 1, it is characterized in that, each described LED light one_to_one corresponding is in each key, and each described LED light is double-colored.
10. broadcasting device adopted by piano according to claim 9, it is characterized in that, described main control processor according to the educational instruction from the described network terminal to control the instruction of described LED light.
11. 1 kinds are applied to the key calibration steps that broadcasting device adopted by piano according to any one of claim 1 to 10, and it is characterized in that, comprising: calibrated the first sensor that it comprises respectively by key detecting unit, described calibration comprises:
Step 11: when pressing each key, the transmitting terminal of enable each first sensor also regulates the PWM value of transmitting terminal by predetermined manner, obtain the current button sampled signal values of the receiving end of described first sensor after adjustment;
Step 12: judge whether key is pressed to bottom;
Step 13: if so, current button sampled signal values is saved as by bottom standard value, and judge whether described current button sampled signal values is greater than a setting value, and when result is for being, regulated PWM value is saved as PWM standard value;
Described method also comprises: circulation performs step 11 ~ 13, until each described first sensor all saves by when to bottom standard value and PWM standard value, what the button sampled signal values obtained after time delay Preset Time is saved as corresponding key lifts lifts standard value.
12. 1 kinds are applied to the key signal sampling method that broadcasting device adopted by piano according to any one of claim 1 to 10, it is characterized in that, comprising:
Step 21: the current button sampled signal obtaining described key detecting unit, and when being provided with the first ident value that corresponding key presses and pressing standard value, judge current button sampled signal values presses standard value to judge whether key is pressed described in whether being greater than;
Step 22: press key if be judged as, first ident value is composed true value, and when being set with corresponding key and being pressed to the second ident value of bottom and being pressed to bottom standard value, judge currently whether to meet the key preset and be pressed to bottom condition, wherein, described key is pressed to bottom condition and comprises: be pressed to bottom standard value and the first ident value is true described in current button sampled signal values is greater than;
Step 23: if meet key to be pressed to bottom condition, send key by key detecting unit and press signal to described main control unit, and described second ident value is composed true value, wherein, described key is pressed signal and is comprised: the key assignments of key and key are from the representative value being pressed to the time arriving bottom;
Step 24: do not press key if be judged as, when be set with that corresponding key lifts lift standard value, judge currently whether to meet the key preset and lift condition, wherein, described key lifts condition and comprises: described first ident value and the second ident value for true and current button sampled signal values be less than described in lift standard value;
Step 25: if meet key to lift condition, be then sent to described main control unit by the key assignments of the corresponding key of key detecting unit transmission key, and described first ident value and the second ident value reset;
Described method also comprises: circulation performs described step 21 ~ step 25 until receive circulation stop signal.
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| CN201610213505.5A CN105702120A (en) | 2015-04-08 | 2016-04-07 | Piano sound collecting and broadcasting device and key calibration method |
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