CN203839026U - Piano keyboard motion detection apparatus - Google Patents
Piano keyboard motion detection apparatus Download PDFInfo
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- CN203839026U CN203839026U CN201420058311.9U CN201420058311U CN203839026U CN 203839026 U CN203839026 U CN 203839026U CN 201420058311 U CN201420058311 U CN 201420058311U CN 203839026 U CN203839026 U CN 203839026U
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- key
- hall element
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- magnet
- piano
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- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 230000033001 locomotion Effects 0.000 title abstract description 10
- 230000006870 function Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- Electrophonic Musical Instruments (AREA)
Abstract
A piano keyboard motion detection apparatus belongs to the field of music teaching equipment. The piano keyboard motion detection apparatus has a magnet arranged on each key. The magnet moves with the key. The position of the magnet relative to a fixed Hall sensor is then changed. The magnetic field intensity of the Hall sensor position also changes. The Hall sensor uploads the number of the key in motion and the motion parameters to a piano key detection main control circuit through a Hall sensor state detection circuit in a Hall output signal means. By adopting a high-cost-performance STM 32 processor, the detection apparatus achieves acquisition and processing of Hall sensor digital signals, standard MIDI flow generation and wireless data output. The detection apparatus has a basic function of automatically detecting the piano key motion in a real-time manner. Problems that a piano learning device is inconvenient to install are solved. The hardware cost is lowered. Convenient operations are further achieved.
Description
Technical field
The utility model relates to a kind of fingerboard action detection device, belongs 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 utility model provides a kind of fingerboard action detection device, 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 utility model 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 beneficial effects of the utility model are: 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.
Brief description of the drawings
Fig. 1 is a kind of mechanical schematic diagram of fingerboard action detection device.
Fig. 2 is the first circuit diagram of Hall element state-detection.
Fig. 3 is the second circuit figure of Hall element state-detection.
Fig. 4 is the tertiary circuit figure of Hall element state-detection.
Fig. 5 is the 4th circuit diagram of Hall element state-detection.
Fig. 6 is the first circuit diagram that piano key detects master control.
Fig. 7 is the second circuit figure that piano key detects master control.
Fig. 8 is the tertiary circuit figure that piano key detects master control
?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. 2-5 show 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. taking 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. 6-8 show piano key and detect governor circuit.Be responsible for generation and the wireless transmission control etc. of standard MIDI stream.Circuit, taking 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, ensures 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 |
|---|---|---|---|
| CN201420058311.9U CN203839026U (en) | 2014-02-07 | 2014-02-07 | Piano keyboard motion detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420058311.9U CN203839026U (en) | 2014-02-07 | 2014-02-07 | Piano keyboard motion detection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203839026U true CN203839026U (en) | 2014-09-17 |
Family
ID=51516839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420058311.9U Expired - Lifetime CN203839026U (en) | 2014-02-07 | 2014-02-07 | Piano keyboard motion detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203839026U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794199A (en) * | 2014-02-07 | 2014-05-14 | 大连佳音科技有限公司 | Piano keyboard motion detection device |
| CN105679142A (en) * | 2016-03-02 | 2016-06-15 | 大连佳音科技有限公司 | Piano playing motion detection apparatus with adaptive installation characteristic |
-
2014
- 2014-02-07 CN CN201420058311.9U patent/CN203839026U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794199A (en) * | 2014-02-07 | 2014-05-14 | 大连佳音科技有限公司 | Piano keyboard motion detection device |
| CN105679142A (en) * | 2016-03-02 | 2016-06-15 | 大连佳音科技有限公司 | Piano playing motion detection apparatus with adaptive installation characteristic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140917 |