CN204045198U - A kind of photoelectric detection system of fingerboard action - Google Patents
A kind of photoelectric detection system of fingerboard action Download PDFInfo
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- CN204045198U CN204045198U CN201420486847.0U CN201420486847U CN204045198U CN 204045198 U CN204045198 U CN 204045198U CN 201420486847 U CN201420486847 U CN 201420486847U CN 204045198 U CN204045198 U CN 204045198U
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Abstract
A photoelectric detection system for fingerboard action, belongs to music teaching equipment technical field.This photoelectric detection system is arranged on correlation infrared electro device, reflective infrared photoelectric device and Photoelectric Detection data processing unit on opto-electronic sensor support, and Photoelectric Detection data processing unit comprises the photoelectric sensor state detection unit and piano key detection main control unit carrying out being electrically connected.This photoelectric detection system adopts and realizes the acquisition of photoelectric figure signal, process, the generation of standard MIDI stream and wireless data based on the STM8 processor of high performance-price ratio and export.Possess the basic function of the self-adaptation setting of key state and the real time automatic detection of piano key action, solve piano study device and the problems such as inconvenient are installed, reduce hardware cost, and easy to operate.
Description
Technical field
The utility model relates to a kind of photoelectric detection system of fingerboard action, belongs to music teaching equipment technical field.
Background technology
Use the signal pickup assembly of the correlation Photoelectric infrared switch form be positioned over below key at present in the world.Signal acquisition device is light emitting devices, light receiving element, the shade that is connected with key.The shade that can be synchronized with the movement with key is settled between described photoemissive device and light receiving element.When playing piano, light emitting devices, light receiving element will produce break-make because the relative qin frame of keyboard moves with shade, the photosignal that result light emitting devices sends or received by photoelectric receiving device or stopped, to play the various keyboard action such as state, duration Parameter Switch is 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: one is install complexity, requires very high, need professional person to spend a lot of time Installation and Debugging to installation accuracy, is unfavorable for promoting; Two is destroy piano integrity because will be arranged on below fingerboard, need to punch on piano cabling and screw fixing etc.
Summary of the invention
In order to solve above-mentioned signal pickup assembly Problems existing, the utility model provides a kind of photoelectric detection system of fingerboard action, this device convenient, fast and accurately can realize the motion detection of piano key, and is uploaded to host computer so that standard MIDI format is wireless in real time.
The technical solution adopted in the utility model is: a kind of photoelectric detection system of fingerboard action, it comprises the correlation infrared electro device matched with black key, the reflective infrared photoelectric device matched with white key and Photoelectric Detection data processing unit, infrared light supply and the infrared light receiver of described correlation infrared electro device are fixedly installed on the opto-electronic sensor support of black key both sides respectively, described reflective infrared photoelectric device is fixedly installed on the opto-electronic sensor support above white key, described Photoelectric Detection data processing unit is fixedly installed on the support above correlation infrared electro device and reflective infrared photoelectric device, and be electrically connected with correlation infrared electro device and reflective infrared photoelectric device, described Photoelectric Detection data processing unit comprises the photoelectric sensor state detection unit and piano key detection main control unit carrying out being electrically connected.
Described photoelectric sensor state detection unit adopts the correlation phototube circuit of the main control singlechip circuit of the power circuit of photoelectric device, photoelectric device, the LED indicating circuit of photoelectric device, the reflection phototube circuit of photoelectric device and photoelectric device to be electrically connected.
The interface board power circuit that described piano key detection main control unit adopts piano key to detect, interface board main control MCU circuit, the interface board MIDI input circuit of piano key detection and the interface board MIDI output circuit of piano key detection that piano key detects are electrically connected.
The beneficial effects of the utility model are: this photoelectric detection system is arranged on correlation infrared electro device, reflective infrared photoelectric device and Photoelectric Detection data processing unit on opto-electronic sensor support, and Photoelectric Detection data processing unit comprises the photoelectric sensor state detection unit and piano key detection main control unit carrying out being electrically connected.This photoelectric detection system adopts and realizes the acquisition of photoelectric figure signal, process, the generation of standard MIDI stream and wireless data based on the STM8 processor of high performance-price ratio and export.Possess the basic function of the self-adaptation setting of key state and the real time automatic detection of piano key action, solve piano study device and 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 photoelectric detection system of fingerboard action.
Fig. 2 is the A-A view in Fig. 1.
Fig. 3 is the B enlarged drawing in Fig. 2.
Fig. 4 is the power circuit diagram of photoelectric device.
Fig. 5 is the main control singlechip circuit diagram of photoelectric device.
Fig. 6 is the LED indicating circuit figure of photoelectric device.
Fig. 7 is the reflected light fulgurite circuit diagram of photoelectric device.
Fig. 8 is the correlation phototube circuit figure of photoelectric device.
Fig. 9 is the interface board power circuit diagram that piano key detects.
Figure 10 is the interface board main control MCU circuit diagram that piano key detects.
Figure 11 is the interface board MIDI input circuit figure that piano key detects.
Figure 12 is the interface board MIDI output circuit figure that piano key detects.
In figure: 1, black key, 2, correlation infrared electro device, 3, white key, 4, reflective infrared photoelectric device, 5, Photoelectric Detection data processing unit, 6, Qin Gai, 7, key fulcrum.
embodiment
Fig. 1,2,3 shows a kind of mechanical schematic diagram of photoelectric detection system of fingerboard action.The photoelectric detection system of fingerboard action comprises the correlation infrared electro device 2 matched with black key 1, the reflective infrared photoelectric device 4 matched with white key 3 and Photoelectric Detection data processing unit 5.Infrared light supply and the infrared light receiver of correlation infrared electro device 2 are fixedly installed on the opto-electronic sensor support of black key 1 both sides respectively.Reflective infrared photoelectric device 4 is fixedly installed on the opto-electronic sensor support above white key 3.Photoelectric Detection data processing unit 5 is fixedly installed on the support above correlation infrared electro device 2 and reflective infrared photoelectric device 4, and is electrically connected with correlation infrared electro device 2 and reflective infrared photoelectric device 4.
84 keys and 84 infrared electro devices have relation one to one, and the infrared device not action with the action with key, but the change in location with corresponding key changes by photosignal, this relation had both reflected rhythm of action, the information such as responsiveness and action dynamics of key.
Fig. 4,5,6,7,8 shows the circuit diagram of photoelectric sensor state detection unit.Photoelectric sensor state detection unit adopts the correlation phototube circuit of the main control singlechip circuit of the power circuit of photoelectric device, photoelectric device, the LED indicating circuit of photoelectric device, the reflection phototube circuit of photoelectric device and photoelectric device to be electrically connected.Photoelectric sensor state detection unit is responsible for the detection of 12 road signals and conversion and work for the treatment of.Circuit with STM8 CPU for core comprises photoelectric sensor circuit, LED MIDI condition indication circuit, reset circuit, power circuit etc.7 same testing circuit collaborative works can complete the state-detection to 84 piano keys.When there being key generation action, such as to lift or by inferior, the infrared device not action with the action with key, but the change in location with corresponding key changes by photosignal, photoelectric device can the action of Real-time Obtaining key and relevant parameter, and the data parameters obtained flows to CPU processor and carries out judgement process after analog to digital conversion.
Fig. 9,10,11,12 shows the circuit diagram that piano key detects main control unit.The interface board MIDI output circuit of the interface board MIDI input circuit that the interface board main control MCU circuit that the interface board power circuit that piano key detection main control unit adopts piano key to detect, piano key detect, piano key detect and piano key detection is electrically connected.Piano key detects generation and the wireless transmission control etc. that main control unit is responsible for standard MIDI stream.Circuit for core, comprises power circuit, reset circuit, EEPROM memory circuit, Bluetooth wireless transmission circuit etc. with STM8 CPU.The key state that governor circuit is uploaded by private communication interface real-time reception photoelectric sensor testing circuit, namely presses or upsprings, and being converted to standard MIDI format in real time, being uploaded to host computer being further processed by radio transmission control module.EEPROM memory circuit can key parameter as required in real-time storage circuit operational process, ensures system reliability service.
Adopt the photoelectric detection system of technique scheme, when piano, when white key is pressed, because the distance of white key and photoelectric device changes, the infrared electro signal power that photoelectric device receives changes, and sends this analog electrical signal changed to plate and carries CPU and carry out subsequent treatment.When black key is pressed, correlation infrared electro signal changes, and the simulating signal of change is sent to plate and carries CPU and carry out subsequent treatment.Send host computer to through the plate key status number information after CPU process of carrying to be further processed.The reflection of this pick-up unit is sensitive, result accurate, be convenient to digitizing, and cost is low, is convenient to promote on a large scale.
Claims (3)
1. the photoelectric detection system of a fingerboard action, it comprises the correlation infrared electro device (2) matched with black key (1), the reflective infrared photoelectric device (4) matched with white key (3) and Photoelectric Detection data processing unit (5), it is characterized in that: the infrared light supply of described correlation infrared electro device (2) and infrared light receiver are fixedly installed on the opto-electronic sensor support of black key (1) both sides respectively, described reflective infrared photoelectric device (4) is fixedly installed on the opto-electronic sensor support of white key (3) top, described Photoelectric Detection data processing unit (5) is fixedly installed on the support of correlation infrared electro device (2) and reflective infrared photoelectric device (4) top, and be electrically connected with correlation infrared electro device (2) and reflective infrared photoelectric device (4), described Photoelectric Detection data processing unit (5) comprises the photoelectric sensor state detection unit and piano key detection main control unit carrying out being electrically connected.
2. the photoelectric detection system of a kind of fingerboard action according to claim 1, is characterized in that: described photoelectric sensor state detection unit adopts the correlation phototube circuit of the main control singlechip circuit of the power circuit of photoelectric device, photoelectric device, the LED indicating circuit of photoelectric device, the reflection phototube circuit of photoelectric device and photoelectric device to be electrically connected.
3. the photoelectric detection system of a kind of fingerboard action according to claim 1, is characterized in that: the interface board power circuit that described piano key detection main control unit adopts piano key to detect, interface board main control MCU circuit, the interface board MIDI input circuit of piano key detection and the interface board MIDI output circuit of piano key detection that piano key detects are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486847.0U CN204045198U (en) | 2014-08-27 | 2014-08-27 | A kind of photoelectric detection system of fingerboard action |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420486847.0U CN204045198U (en) | 2014-08-27 | 2014-08-27 | A kind of photoelectric detection system of fingerboard action |
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| CN204045198U true CN204045198U (en) | 2014-12-24 |
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Cited By (1)
| 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 |
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2014
- 2014-08-27 CN CN201420486847.0U patent/CN204045198U/en not_active Expired - Fee Related
Cited By (2)
| 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 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |