CN103794199A - Piano keyboard motion detection device - Google Patents
Piano keyboard motion detection device Download PDFInfo
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- CN103794199A CN103794199A CN201410044762.1A CN201410044762A CN103794199A CN 103794199 A CN103794199 A CN 103794199A CN 201410044762 A CN201410044762 A CN 201410044762A CN 103794199 A CN103794199 A CN 103794199A
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Abstract
The invention discloses a piano keyboard motion detection device and belongs to the field of music teaching equipment. A magnet is arranged on a keyboard and moves along with the keyboard; the magnetic field intensity of the position where a Hall sensor is located is made to change by changing the relative position of the magnet and the fixed Hall sensor, and the serial number and motion parameter of each active key are transmitted to a piano key detection main control circuit by the Hall sensor through a Hall sensor state detection circuit in the form of Hall output signals. Hall sensor digital signal acquiring and processing, standard MIDI stream generation and wireless data output are achieved due to the adoption of a high-cost-performance STM32 processor. The piano keyboard motion detection device has the basic function of automatically detecting motion of piano keys in real time, solves the problem that a piano learning device is not convenient to install and is convenient to operate, and hardware cost is reduced.
Description
Technical field
The present invention relates to a kind of fingerboard action detection device, belong to music teaching apparatus field.
Background technology
What use in the world at present is the signal pickup assembly of optoelectronic switch form.Signal acquisition device is light emitting devices, light receiving element.Between described photoemissive device and light receiving element, settle the grating that can move in contrast.In the time of playing piano, light emitting devices, light receiving element will be because of the relative qin frame motion of keyboard relative motions with grating, the photosignal that result light emitting devices sends by the grating of relative motion after be photoelectric receiving device receive, to play the various keyboard action parameters such as dynamics, direction, state, keystroke speed and be converted to corresponding pulse digital signal, so that subsequent conditioning circuit and software processing, and testing result is exported.The shortcoming of this device mainly contains following 2 points: the one, complexity is installed, and very high to installation accuracy requirement, need professional person to spend a lot of time Installation and Debugging, be unfavorable for promoting; The 2nd, in the time having extraneous light, the collection of meeting jammer signal, has a strong impact on the accuracy of signal.
Summary of the invention
The problem existing in order to solve above-mentioned signal pickup assembly, the invention provides a kind of fingerboard action detection device, and this device can convenient, fast and accurately be realized the motion detection of piano key, and in real time with the wireless host computer that is uploaded to of standard midi format.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of fingerboard action detection device, it comprises key, detects sensor and the piano key detection governor circuit of key action, it also comprises magnet and Hall element state detection circuit, described sensor adopts Hall element, on key, be provided with magnet, the Hall element coordinating with magnet detects governor circuit through Hall element state detection circuit and piano key and is electrically connected; Described magnet moves with key, change the position between magnet and fixing Hall element, the magnetic field intensity of Hall element present position is changed, and Hall element is uploaded to piano key in Hall output signal mode by Hall element state detection circuit with action parameter by the key key number that action occurs and detects governor circuit.
The quantity of described key is 88, and each key is provided with a magnet, and Hall element of relative set.
Described Hall element state detection circuit and piano key detect that governor circuit is integrated to be arranged on circuit board.
Adopt above-mentioned technical scheme, its principal feature is:
(1) fingerboard action detection device adopts STM32 processor based on high performance-price ratio to realize generation and the wireless data output of the obtaining of Hall element digital signal, processing, standard MIDI stream;
(2) described magnetic signal obtains and change-over circuit employing magnet and Hall element cooperation realization.Magnet is followed key and is moved accordingly, action and relevant parameter that Hall element can Real-time Obtaining magnet, and the data parameters of obtaining flows to CPU processor and judges processing after analog to digital conversion;
(3) the magnet action data that described data processing circuit obtains according to magnetic signal and change-over circuit provides, the manner of execution of the each key of real-time judge, and produce in real time accordingly corresponding MIDI data stream;
(4) the standard MIDI data flow data that described data transmission circuit produces data processing circuit is real-time transmitted to host computer with wireless mode and is further processed.
The invention has the beneficial effects as follows: this fingerboard action detection device is provided with magnet on key, magnet moves with key, change the position between magnet and fixing Hall element, the magnetic field intensity of Hall element present position is changed, and Hall element is uploaded to piano key in Hall output signal mode by Hall element state detection circuit with action parameter by the key key number that action occurs and detects governor circuit.This pick-up unit adopts the STM32 processor based on high performance-price ratio to realize generation and the wireless data output of the obtaining of Hall element digital signal, processing, standard MIDI stream.Possess the basic function of the real time automatic detection of piano key action, solved piano study device the problems such as inconvenient are installed, reduce hardware cost, and easy to operate.
Accompanying drawing explanation
Fig. 1 is a kind of mechanical schematic diagram of fingerboard action detection device.
Fig. 2 is Hall element state detection circuit figure.
Fig. 3 is that piano key detects governor circuit figure.
In figure: 1, piano key, 2, magnet, 3, Hall element, 4, circuit board, 5, key fulcrum, 6, Qin Gai.
embodiment
Fig. 1 shows a kind of mechanical schematic diagram of fingerboard action detection device.In figure, fingerboard action detection device comprises key 1, detects sensor, piano key detection governor circuit and Hall element state detection circuit that key 1 moves, sensor adopts Hall element 3, on key 1, be provided with magnet 2, the Hall element 3 coordinating with magnet 2 detects governor circuit through Hall element state detection circuit and piano key and is electrically connected.Magnet 2 moves with key 1, change the position between magnet 2 and fixing Hall element 3, the magnetic field intensity of Hall element 3 present positions is changed, and Hall element 3 is uploaded to piano key in Hall output signal mode by Hall element state detection circuit with action parameter by the key key number that action occurs and detects governor circuit.Fingerboard action detection device comprises 88 keys 1, is placed in 88 magnet 2 on 88 keys, 88 Hall elements 3 of detection magnet positions.Hall element state detection circuit and piano key detect that governor circuit is integrated to be arranged on circuit board 4.
Fig. 2 shows Hall element state detection circuit.Be responsible for detection and conversion and the work for the treatment of of 11 road signals.Circuit comprises Hall element circuit, LED MIDI condition indication circuit, reset circuit, power circuit etc. take STM32 CPU as core.8 same testing circuit collaborative works can complete the state-detection to 88 piano keys.In the time having key that action occurs, for example lift or by inferior, between the magnet that key is corresponding and Hall element by corresponding generation change of distance, whether testing circuit has key to move according to the amplitude of variation automatic discrimination of each Hall element, and the key key number that action occurs is uploaded to piano key detection governor circuit with action parameter.
Fig. 3 shows piano key and detects governor circuit.Be responsible for generation and the wireless transmission control etc. of standard MIDI stream.Circuit, take STM32 CPU as core, comprises power circuit, reset circuit, EEPROM memory circuit, Bluetooth wireless transmission circuit etc.Governor circuit receives by private communication interface the key state that Hall element testing circuit is uploaded in real time, presses or upsprings etc., and being converted in real time standard midi format, is uploaded to host computer is further processed by radio transmission control module.Eeprom circuit is the key parameter in real-time storage circuit operational process as required, guarantees system reliability service.
Claims (3)
1. a fingerboard action detection device, it comprises key (1), detects sensor and the piano key detection governor circuit of key (1) action, it is characterized in that: further comprising magnet (2) and Hall element state detection circuit, described sensor adopts Hall element (3), on key (1), be provided with magnet (2), the Hall element (3) coordinating with magnet (2) detects governor circuit through Hall element state detection circuit and piano key and is electrically connected; Described magnet (2) moves with key (1), change the position between magnet (2) and fixing Hall element (3), the magnetic field intensity of Hall element (3) present position is changed, and Hall element (3) is uploaded to piano key in Hall output signal mode by Hall element state detection circuit with action parameter by the key key number that action occurs and detects governor circuit.
2. a kind of fingerboard action detection device according to claim 1, is characterized in that: the quantity of described key (1) is 88, each key (1) is provided with a magnet (2), and a Hall element of relative set (3).
3. a kind of fingerboard action detection device according to claim 1, is characterized in that: described Hall element state detection circuit and piano key detect that governor circuit is integrated to be arranged on circuit board (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410044762.1A CN103794199A (en) | 2014-02-07 | 2014-02-07 | Piano keyboard motion detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410044762.1A CN103794199A (en) | 2014-02-07 | 2014-02-07 | Piano keyboard motion detection device |
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| CN103794199A true CN103794199A (en) | 2014-05-14 |
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| CN201410044762.1A Pending CN103794199A (en) | 2014-02-07 | 2014-02-07 | Piano keyboard motion detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157276A (en) * | 2014-08-27 | 2014-11-19 | 大连佳音科技有限公司 | Photoelectric detection device and detection method for motions of piano keyboard |
| CN106033667A (en) * | 2016-06-06 | 2016-10-19 | 附点信息科技（上海）有限公司 | Keyboard instrument digital input system |
| CN107393508A (en) * | 2017-08-15 | 2017-11-24 | 北京库客音乐股份有限公司 | A kind of intelligent piano and its assemble method |
| CN113611270A (en) * | 2021-08-19 | 2021-11-05 | 雅弦信息科技(深圳)有限公司 | Keyboard musical instrument digital input system |
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| CN1624758A (en) * | 2003-12-05 | 2005-06-08 | 深圳市桑海为实业发展有限公司 | Radio remote control automatic playing system of piano |
| CN201191498Y (en) * | 2008-04-23 | 2009-02-04 | 蔡冬冬 | Electronic device connecting piano and computer |
| CN102445670A (en) * | 2010-10-13 | 2012-05-09 | 北京中科信电子装备有限公司 | Alternating current Hall system |
| CN203338616U (en) * | 2013-06-19 | 2013-12-11 | 上海渐华科技发展有限公司 | Range sensor-based intelligent piano teaching apparatus |
| CN203839026U (en) * | 2014-02-07 | 2014-09-17 | 大连佳音科技有限公司 | Piano keyboard motion detection apparatus |
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2014
- 2014-02-07 CN CN201410044762.1A patent/CN103794199A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1624758A (en) * | 2003-12-05 | 2005-06-08 | 深圳市桑海为实业发展有限公司 | Radio remote control automatic playing system of piano |
| CN201191498Y (en) * | 2008-04-23 | 2009-02-04 | 蔡冬冬 | Electronic device connecting piano and computer |
| CN102445670A (en) * | 2010-10-13 | 2012-05-09 | 北京中科信电子装备有限公司 | Alternating current Hall system |
| CN203338616U (en) * | 2013-06-19 | 2013-12-11 | 上海渐华科技发展有限公司 | Range sensor-based intelligent piano teaching apparatus |
| CN203839026U (en) * | 2014-02-07 | 2014-09-17 | 大连佳音科技有限公司 | Piano keyboard motion detection apparatus |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157276A (en) * | 2014-08-27 | 2014-11-19 | 大连佳音科技有限公司 | Photoelectric detection device and detection method for motions of piano keyboard |
| CN104157276B (en) * | 2014-08-27 | 2017-05-31 | 大连佳音科技有限公司 | The photoelectric detection system and its detection method of a kind of fingerboard action |
| CN106033667A (en) * | 2016-06-06 | 2016-10-19 | 附点信息科技（上海）有限公司 | Keyboard instrument digital input system |
| CN107393508A (en) * | 2017-08-15 | 2017-11-24 | 北京库客音乐股份有限公司 | A kind of intelligent piano and its assemble method |
| CN107393508B (en) * | 2017-08-15 | 2021-05-18 | 北京库客音乐股份有限公司 | A kind of intelligent piano and its assembly method |
| CN113611270A (en) * | 2021-08-19 | 2021-11-05 | 雅弦信息科技(深圳)有限公司 | Keyboard musical instrument digital input system |
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Application publication date: 20140514 |