CN203192385U - Mechanical piano playing information acquisition device - Google Patents
Mechanical piano playing information acquisition device Download PDFInfo
- Publication number
- CN203192385U CN203192385U CN 201320103724 CN201320103724U CN203192385U CN 203192385 U CN203192385 U CN 203192385U CN 201320103724 CN201320103724 CN 201320103724 CN 201320103724 U CN201320103724 U CN 201320103724U CN 203192385 U CN203192385 U CN 203192385U
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- key
- photoelectric reflection
- reflection switch
- piano
- microprocessor
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Abstract
The utility model discloses a mechanical piano playing information acquisition device. The mechanical piano playing information acquisition device comprises photoelectric reflection switches and microprocessors, wherein the photoelectric reflection switch comprises an emission head and a reception head, the photoelectric reflection switch realizes converting a distance between the photoelectric reflection switch and an outer surface of a key or an outer surface of a key linkage part into an electrical signal, the microprocessors are connected with the photoelectric reflection switches, each microprocessor is preset with a threshold value, the microprocessor detects electrical signal intensity change of the photoelectric reflection switches and calculates a difference value between electrical signal intensity after change and electrical signal intensity under an non-pressed state, and the microprocessor logically determines the key to change from an upspring state to a pressed state when the difference value is equal to or greater than the threshold value. The mechanical piano playing information acquisition device can accurately convert mechanical motions in a mechanical piano playing process into electrical signals while a mechanical piano in the prior art is not reconstructed, and thereby playing information acquisition of a traditional mechanical piano is realized.
Description
Technical field
The utility model relates to mechanical piano study aid, relates in particular to the harvester that a kind of mechanical piano is played information.
Background technology
Piano is a kind of keyboard instrument that is derived from the western classicality music, is made up of 88 keys and metallic cord soundboard, generally is used for performances such as solo, ensemble, accompaniment, and composition and rehearsal music are very convenient.The player affects the piano the inside wrapping the gavel of carpet by pressing the key on the lower keyboard, knocks the steel wire string then and sounds.Piano is called as the king of musical instrument.This is not only because its volume maximum, inner structure is the most complicated, main still because its good comprehensive performance and widely purposes all be that other any musical instruments can't be intended by comparison.
Present piano kind is divided into pianotron and mechanical piano substantially, and pianotron is electrophonic musical instrument, and mechanical piano then is pure mechanical-physical sounding, the string vibrations, and the qin boominess resonance produces.Though at present pianotron relatively is subjected to user's favor with its practicality and superiority of effectiveness, mechanical piano is with its real voice effect and perfectly to play feel be that pianotron can't replace.When particularly accepting the piano study of system, mechanical piano remains difficult point and the emphasis of study.
There is a difficult point in traditional mechanical piano study, the playing information that is exactly mechanical piano can't objectively be gathered, usually all need teacher's continual listening to aside, judge whether bullet mistake of student by the sound that sends, then point out faults timely and and guide corrigendum.This has just brought several problems, and the first, the counselor can not accompany the student at one's side always, and the student practises alone in the process of mechanical piano, and its mistake of playing just unmanned in time the discovery is pointed out.The second, counselor's memory is limited, possibly can't remember the student play the action of playing of each mistake in the process, may miss many unconspicuous mistakes, be disadvantageous to the study of the sturdy system of student.
If in time find to play the problem that occurs in the process, will gather the information of playing, the error correction of then again the information of gathering and correct information being compared, mechanical piano does not have the output of electric signal, so can't gather the information of playing.This just needs a kind of device and method on the basis of not destructive mechanical piano structure, can gather accurately the mechanical piano information of playing.
Summary of the invention
The utility model provides a kind of can accurately gather the device of mechanical piano playing information.
For achieving the above object, the harvester that the utility model mechanical piano is played information comprises photoelectric reflection switch and microprocessor, the photoelectric reflection switch comprises emitting head and receives head, the emitting head of a described photoelectric reflection switch and reception head are towards the outside surface of a key or the outside surface of a key linkage part, the photoelectric reflection switch is converted into electric signal with the distance between the outside surface of the outside surface of this photoelectric reflection switch and a key or a key linkage part, this electrical signal intensity becomes positive correlation or negative correlation with distance, microprocessor connects the photoelectric reflection switch, be preset with threshold value in the microprocessor, at each key, electrical signal intensity and the logic of this key of microprocessor records photoelectric reflection switch when down state not judge that this key is in the state of upspringing, the electrical signal intensity that microprocessor detects the photoelectric reflection switch changes and calculates electrical signal intensity and the difference between the electrical signal intensity during down state not after changing, electrical signal intensity after changing and not the absolute difference between the electrical signal intensity during down state reach or during greater than threshold value, microprocessor logic judges that this key is down state by the state-transition of upspringing, electrical signal intensity after changing and when the absolute difference between the electrical signal intensity during down state is not less than threshold value, microprocessor logic judges that this key continues to keep the state of upspringing or changes the state of upspringing into by down state, and microprocessor sends this key of reflection and is in down state or the digital signal of the state of upspringing.
Adopt above design, the photoelectric reflection switch can be converted to the motion of mechanical piano key the variation of electrical signal intensity, such as the variation that is magnitude of voltage.At each key, the electrical signal intensity of this key of microprocessor records photoelectric reflection switch when down state not and the logic of acquiescence judge that this key is in the state of upspringing; The electrical signal intensity that microprocessor detects the photoelectric reflection switch changes and calculates electrical signal intensity and the difference between the electrical signal intensity during down state not after changing, and this difference can reflect the key back move distance from initial position that is pressed.When the move distance of key does not reach certain numerical value, can think that this key still keeps the state of upspringing; When the move distance of key meets or exceeds certain numerical value, can think that this key is pressed; When the move distance of key during again less than certain numerical value, can think that this key is returned to the state of upspringing; Therefore the threshold value that is preset with in the microprocessor is for reflecting this key at down state or the distance of upspringing and changing between the state.The absolute difference and the threshold value that calculate the electrical signal intensity variation are compared, electrical signal intensity after changing and not the absolute difference between the electrical signal intensity during down state reach or during greater than threshold value, microprocessor logic judges that this key is down state by the state-transition of upspringing, and microprocessor sends the digital signal that this key is in down state; Electrical signal intensity after changing and when the absolute difference between the electrical signal intensity during down state is not less than threshold value, microprocessor logic judges that this key continues to keep the state of upspringing or changes the state of upspringing into by down state, and microprocessor sends the digital signal that this key is in the state of upspringing.Thereby the process that realization is played information digitalization with mechanical piano.Simultaneously, can the default different threshold value in position specifically be set according to mechanical piano and the photoelectric reflection switch of different model, to adapt to the piano of different model.Also can define a plurality of different threshold values for different keys simultaneously.Because what calculate is the difference of change in electric, rather than single-point value, even the photoelectric reflection switch takes place aging, the electrical signal intensity that causes detecting changes, therefore the difference that calculates still can not change, and still can not make a mistake by the difference accuracy that state and down state logic judge of upspringing.
The harvester that mechanical piano of the present utility model is played information also comprises back up pad, back up pad is dismountable to be fixed in casing of piano or the piano qin case, the photoelectric reflection switch is fixed on the back up pad, and the emitting head of each photoelectric reflection switch and reception head are towards the outside surface of each key or the outside surface of key linkage part after back up pad is fixing.Whole photoelectric reflection switches is arranged on the back up pad, only need directly back up pad to be fixed in casing of piano or the piano qin case when using, can realize that like this harvester is independent of the fast assembling-disassembling of mechanical piano and the photoelectric reflection position of the switch is stable in use.
The top that is fixed on key linkage part in the qin case of the dismountable level of back up pad of the present utility model, photoelectric reflection switch emitting head and reception head are towards the upper surface of key linkage part.When using, open the qin case, put into back up pad, the one side of feasible band photoelectric reflection switch is towards the key linkage part, and each photoelectric reflection switch emitting head and the corresponding key linkage part of reception head difference.Suppose that electric signal is that magnitude of voltage illustrates, after the user has set up equipment, when not pressing key, at each key, magnitude of voltage (being defined as initial voltage value) and the logic of microprocessor records photoelectric reflection switch at this moment judge that this key is in the state of upspringing; When the user presses key, the key linkage part moves upward and relies on the photoelectric reflection switch, along with reducing of distance between key linkage part and the photoelectric reflection switch, the photoelectric reflection switch increases to the magnitude of voltage that microprocessor sends, difference between microprocessor calculating magnitude of voltage this moment and the initial voltage value, when the absolute value of difference less than threshold value the time, judge that then this key still is in the state of upspringing, when the absolute value of difference is equal to or greater than threshold value, judge that then this key is down state by the state-transition of upspringing.When the user decontrols key, key is upspring, and the key linkage part moves downward away from the photoelectric reflection switch, and the photoelectric reflection switch reduces to the magnitude of voltage that microprocessor sends, when difference again less than threshold value the time, judge that then this key changes the state of upspringing into by down state.
The quantity of photoelectric reflection switch of the present utility model is consistent with the quantity of piano key, the outside surface of the corresponding key of each photoelectric reflection switch or the outside surface of a key linkage part.For traditional mechanical piano, generally by 88 keys, can adopt 88 photoelectric reflection switches to aim at each key respectively and gather.Can play information acquisition to whole keys like this.
Microprocessor of the present utility model is single-chip microcomputer.
Microprocessor of the present utility model externally sends this key of reflection in the mode of serial ports and is in down state or the digital signal of the state of upspringing.Can directly be connected with the USB interface of panel computer or desktop computer, analyze for related software.
Compared with prior art, the utility model mechanical piano is played the harvester of information on the basis of the existing machinery piano not being transformed, only need simple device of dismountable use, just the mechanical motion that mechanical piano can be played in the process is transformed into electric signal accurately, thereby realize the collection of information that traditional mechanical piano is played, these information can offer subsequent treatment software and carry out analyzing and processing, and instruction analysis is used such as carrying out.
Description of drawingsBelow in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 plays the mounting structure synoptic diagram of the harvester of information for the utility model mechanical piano;
Fig. 2 plays the structural representation of the harvester of information for the utility model mechanical piano;
Fig. 3 plays the partial structurtes synoptic diagram of the harvester of information for the utility model mechanical piano;
Below each unit number in the utility model Figure of description is described:
1---the photoelectric reflection switch;
11---emitting head;
12---receive head;
2---microprocessor;
3---key;
4---back up pad.
EmbodimentAs Fig. 1,2, shown in 3, the harvester that the utility model mechanical piano is played information comprises photoelectric reflection switch 1 and microprocessor 2, photoelectric reflection switch 1 comprises emitting head 11 and receives 12, the emitting head 11 of a described photoelectric reflection switch 1 and receive head towards 12 to the outside surface of a key 3 or the outside surface of a key linkage part, the photoelectric reflection switch is converted into electric signal with the distance between the outside surface of the outside surface of this photoelectric reflection switch and a key or a key linkage part, this electrical signal intensity becomes positive correlation or negative correlation with distance, microprocessor 2 connects photoelectric reflection switch 1, be preset with threshold value in the microprocessor 2, at each key 3, electrical signal intensity and the logic of these keys of microprocessor 2 record photoelectric reflection switch 1 when down state not judge that this key is in the state of upspringing, the electrical signal intensity that microprocessor 2 detects photoelectric reflection switches 1 changes and calculates electrical signal intensity and the difference between the electrical signal intensity during down state not after changing, electrical signal intensity after changing and not the absolute difference between the electrical signal intensity during down state reach or during greater than threshold value, microprocessor 2 logics judge that this key 3 is down state by the state-transition of upspringing, electrical signal intensity after changing and when the absolute difference between the electrical signal intensity during down state is not less than threshold value, microprocessor 2 logics judge that this key continues to keep the state of upspringing or changes the state of upspringing into by down state, and microprocessor 2 sends this key of reflection and is in down state or the digital signal of the state of upspringing.
Adopt above design, the photoelectric reflection switch can be converted to the motion of mechanical piano key the variation of electrical signal intensity, such as the variation that is magnitude of voltage.At each key, the electrical signal intensity of this key of microprocessor records photoelectric reflection switch when down state not and the logic of acquiescence judge that this key is in the state of upspringing;
The electrical signal intensity that microprocessor detects the photoelectric reflection switch changes and calculates electrical signal intensity and the difference between the electrical signal intensity during down state not after changing, and this difference can reflect the key back move distance from initial position that is pressed.When the move distance of key does not reach certain numerical value, can think that this key still keeps the state of upspringing; When the move distance of key meets or exceeds certain numerical value, can think that this key is pressed; When the move distance of key during again less than certain numerical value, can think that this key is returned to the state of upspringing; Therefore the threshold value that is preset with in the microprocessor is for reflecting this key at down state or the distance of upspringing and changing between the state.The absolute difference and the threshold value that calculate the electrical signal intensity variation are compared, electrical signal intensity after changing and not the absolute difference between the electrical signal intensity during down state reach or during greater than threshold value, microprocessor logic judges that this key is down state by the state-transition of upspringing, and microprocessor sends the digital signal that this key is in down state; Electrical signal intensity after changing and when the absolute difference between the electrical signal intensity during down state is not less than threshold value, microprocessor logic judges that this key continues to keep the state of upspringing or changes the state of upspringing into by down state, and microprocessor sends the digital signal that this key is in the state of upspringing.Thereby the process that realization is played information digitalization with mechanical piano.Simultaneously, can the default different threshold value in position specifically be set according to mechanical piano and the photoelectric reflection switch of different model, to adapt to the piano of different model.Also can define a plurality of different threshold values for different keys simultaneously.Because what calculate is the difference of change in electric, rather than single-point value, even the photoelectric reflection switch takes place aging, the electrical signal intensity that causes detecting changes, therefore the difference that calculates still can not change, and still can not make a mistake by the difference accuracy that state and down state logic judge of upspringing.
The harvester that mechanical piano of the present utility model is played information also comprises back up pad 4, back up pad 4 dismountable being fixed in casing of piano or the piano qin case, photoelectric reflection switch 1 is fixed on the back up pad 4, when the emitting head 11 of the fixing back of back up pad 4 photoelectric reflection switch 1 and reception 12 towards the outside surface of a key 3 or the outside surface of a key linkage part.Whole photoelectric reflection switches 1 is arranged on the back up pad 4, only need directly back up pad 4 to be fixed in casing of piano or the piano qin case when using, can realize that like this harvester is independent of the fast assembling-disassembling of mechanical piano and the photoelectric reflection position of the switch is stable in use.
The top that is fixed on key linkage part in the qin case of back up pad 4 dismountable levels of the present utility model, photoelectric reflection switch 1 emitting head 11 and reception 12 upper surface towards the key linkage part.When using, open the qin case, put into back up pad, the one side of feasible band photoelectric reflection switch is towards the key linkage part, and each photoelectric reflection switch emitting head and the corresponding key linkage part of reception head difference.Suppose that electric signal is that magnitude of voltage illustrates, after the user has set up equipment, when not pressing key, at each key, magnitude of voltage (being defined as initial voltage value) and the logic of microprocessor records photoelectric reflection switch at this moment judge that this key is in the state of upspringing; When the user presses key, the key linkage part moves upward and relies on the photoelectric reflection switch, along with reducing of distance between key linkage part and the photoelectric reflection switch, the photoelectric reflection switch increases to the magnitude of voltage that microprocessor sends, difference between microprocessor calculating magnitude of voltage this moment and the initial voltage value, when the absolute value of difference less than threshold value the time, judge that then this key still is in the state of upspringing, when the absolute value of difference is equal to or greater than threshold value, judge that then this key is down state by the state-transition of upspringing.When the user decontrols key, key is upspring, and the key linkage part moves downward away from the photoelectric reflection switch, and the photoelectric reflection switch reduces to the magnitude of voltage that microprocessor sends, when difference again less than threshold value the time, judge that then this key changes the state of upspringing into by down state.
The quantity of photoelectric reflection switch 1 of the present utility model is consistent with the quantity of piano key 3, the outside surface of each photoelectric reflection switch 1 corresponding key 3 or the outside surface of a key linkage part.For traditional mechanical piano, generally by 88 keys, can adopt 88 photoelectric reflection switches to aim at each key respectively and gather.Can play information acquisition to whole keys like this.The number of photoelectric reflection switch can be determined by the key number of mechanical piano.
Use the utility model to carry out the acquisition method that mechanical piano is played information, comprise the steps step 1: piano key number that need to determine collection; Step 2: will aim at the outside surface of each key or the outside surface of key linkage part respectively with the photoelectric reflection switch that the piano key number of needs collection equates; Step 3: each photoelectric reflection switch is aimed at this photoelectric reflection switch with it key outside surface or the distance between the key linkage part outside surface are converted into electric signal, according to photoelectric reflection switch installation site, this electrical signal intensity becomes positive correlation or negative correlation with distance; Step 4: key is when down state not, and each photoelectric reflection switch sends to microprocessor with electric signal, and the electrical signal intensity of each photoelectric reflection switch of microprocessor records and logic judge that key is in the state of upspringing; Step 5: be preset with threshold value in the microprocessor, the electrical signal intensity that microprocessor detects the photoelectric reflection switch at each key changes and calculates electrical signal intensity and the difference between the electrical signal intensity during down state not after changing, electrical signal intensity after changing and not the absolute difference between the electrical signal intensity during down state reach or during greater than threshold value, microprocessor logic judges that this key is down state by the state-transition of upspringing, electrical signal intensity after changing and when the absolute difference between the electrical signal intensity during down state is not less than threshold value, microprocessor logic judges that this key continues to keep the state of upspringing or changes the state of upspringing into by down state; Step 6: microprocessor sends each key of reflection and is in down state or the digital signal of the state of upspringing.
Using the utility model to carry out mechanical piano plays the photoelectric reflection switch described in the acquisition method step 2 of information and is arranged on the back up pad, to have dismountable being fixed in the piano qin case of back up pad of photoelectric reflection switch, the photoelectric reflection switch that equates with the piano key number of needs collection is aimed at the outside surface of each key or the outside surface of key linkage part respectively.
Use the utility model to carry out the top that is fixed on key linkage part in the qin case that mechanical piano is played the dismountable level of the described back up pad of acquisition method of information, photoelectric reflection switch emitting head and reception head are towards the upper surface of key linkage part.
Using the utility model to carry out mechanical piano plays the described microprocessor of acquisition method of information and is single-chip microcomputer.
Reflected light electric switch in the utility model can use commercially available TCRT5000 reflected light electric switch to realize that this infrared sensor has noncontact, convenient welding, stable performance, moderate cost.This reflected light electric switch can carry out being sent to microprocessor after shaping and the filtering to the voltage of gathering.
Microprocessor can use the STC12C5608AD single-chip microcomputer of commercially available Nantong state core Microtronic A/S.
The signal that the electric signal that the utility model reflected light electric switch is gathered can reflect the distance between the outside surface of the outside surface of reflected light electric switch and a key or a key linkage part for voltage, electric current or other.The intensity of this electric signal becomes positive correlation with the distance that reflects still be that negative correlation is mainly determined by reflected light electric switch installation site and computing function, and distance is monotonic quantity with the function of electrical signal intensity.
Key linkage part described in the utility model is parts of mechanical piano, requires direct or indirect being in transmission connection of these parts and key, and it can move along with the motion of key, thus the motion state of reflection key.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure transformation that utilizes the utility model instructions and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (6)
1. mechanical piano is played the harvester of information, it is characterized in that: it comprises photoelectric reflection switch and microprocessor, the photoelectric reflection switch comprises emitting head and receives head, the emitting head of a described photoelectric reflection switch and reception head are towards the outside surface of a key or the outside surface of a key linkage part, the photoelectric reflection switch is converted into electric signal with the distance between the outside surface of the outside surface of this photoelectric reflection switch and a key or a key linkage part, this electrical signal intensity becomes positive correlation or negative correlation with distance, and microprocessor connects the photoelectric reflection switch.
2. mechanical piano according to claim 1 is played the harvester of information, it is characterized in that: the harvester that described mechanical piano is played information also comprises back up pad, back up pad is dismountable to be fixed in casing of piano or the piano qin case, the photoelectric reflection switch is fixed on the back up pad, and the emitting head of a photoelectric reflection switch and reception head are towards the outside surface of a key or the outside surface of a key linkage part after back up pad is fixing.
3. mechanical piano according to claim 2 is played the harvester of information, it is characterized in that: the top that is fixed on key linkage part in the qin case of the dismountable level of described back up pad, photoelectric reflection switch emitting head and reception head are towards the upper surface of key linkage part.
4. play the harvester of information according to each described mechanical piano of claim 1-3, it is characterized in that: the quantity of described photoelectric reflection switch is consistent with the quantity of piano key, the outside surface of the corresponding key of each photoelectric reflection switch or the outside surface of a key linkage part.
5. play the harvester of information according to each described mechanical piano of claim 1-3, it is characterized in that: described microprocessor is single-chip microcomputer.
6. play the harvester of information according to each described mechanical piano of claim 1-3, it is characterized in that: described microprocessor externally sends this key of reflection in the mode of serial ports and is in down state or the digital signal of the state of upspringing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103724 CN203192385U (en) | 2013-03-07 | 2013-03-07 | Mechanical piano playing information acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103724 CN203192385U (en) | 2013-03-07 | 2013-03-07 | Mechanical piano playing information acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203192385U true CN203192385U (en) | 2013-09-11 |
Family
ID=49109224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320103724 Expired - Lifetime CN203192385U (en) | 2013-03-07 | 2013-03-07 | Mechanical piano playing information acquisition device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203192385U (en) |
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2013
- 2013-03-07 CN CN 201320103724 patent/CN203192385U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130911 |