CN109065009A

CN109065009A - A kind of built-in piano key action detection device

Info

Publication number: CN109065009A
Application number: CN201811212722.8A
Authority: CN
Inventors: 曾延寿
Original assignee: Flying Education Technology (shenzhen) Co Ltd
Current assignee: Flying Education Technology (shenzhen) Co Ltd
Priority date: 2018-10-18
Filing date: 2018-10-18
Publication date: 2018-12-21

Abstract

The invention discloses a kind of built-in piano key action detection devices, are installed below keys and keyboard；Including shell, it is equipped with pcb board in shell, multiple photoelectric sensors, multiple groups switch module, a single-chip microcontroller, detection circuit and bluetooth module are provided on pcb board, every group of switch module is correspondingly connected with multiple photoelectric sensors, the corresponding key of a photoelectric sensor；Shell is equipped with window, window is provided with lens, photoelectric sensor includes photoemitter and photelectric receiver, photoemitter transmitting light passes through lens and is received across lens by photelectric receiver in key bottom reflection, photelectric receiver converts electric signal for the optical signal received and generates midi signal by being transmitted to single-chip microcontroller, single-chip microcontroller after detection circuit amplification detection and be uploaded to terminal through bluetooth module.The present invention uses reflective photoelectric sensor completely, using single channel single-chip microcontroller scheme, it is only necessary to write one SCM program of burning, control 11 groups of multiplex switch movements and detect.Circuit is simple and efficient, and element cost and production cost are all relatively low.

Description

A kind of built-in piano key action detection device

Technical field

The present invention relates to Piano Fittings technical field, especially a kind of built-in piano key action detection device.

Background technique

According to the difference of internal structure and principle of sound, piano in the market can be divided into two classes: one kind is traditional piano (also known as mechanical piano perhaps primary sound piano) one kind is pianotron (also known as fender or digital piano).

Traditional piano is finger tapping key, transmitted by lever, affects to hit tumtum and tap string and makes a sound.Tradition Piano construction is complicated, and purchase and maintenance cost are high, and function expansibility is poor, but tone color soft handle, and profession is suitble to play.

Pianotron, is finger tapping key, and internal circuitry senses entry and simulating makes a sound.Pianotron structure is simple, Purchase is low with maintenance cost, and tone color feel is poorer than traditional piano, is suitble to the common learners to Price Sensitive.Pianotron one Very prominent advantage is that function expansibility is strong, can store memory, modified tone, audio mixing etc., and has midi interface (can connect computer Or mobile phone), earphone, microphone etc., the combination of piano and modern science and technology may be implemented.

Currently on the market there are mainly two types of traditional piano key detection scheme, it is all based on photoelectric sensor and multichannel monolithic There are many machine technology, disadvantage.

One of which is located on fingerboard, by bottom male and fomale(M&F), is fixed on black and white key.Mainly The disadvantage is that: key space, especially black key (inherently shorter) are occupied, influences normally to play；Structure fixation is unstable, easily produces Raw noise, interferes sound of musical instrument；Device is external, influences beauty；White key uses retroreflective photoelectric sensor, and black key is used to penetrating photoelectric sensing Device, structure is complicated, and can only detect key switch movement, can not detect the more information such as the dynamics of playing；Multichannel SCM system, Circuit is complicated, at high cost；

Another kind is built-in suspension at the top of piano, is acquired by optical flame detector and identifies that hitting tumtum hits the movement of string, to reach Detect the purpose of piano key movement.Major defect is: compatibility is poor.The fingerboard of various models is typically all unified rule Lattice, but internal structure is multifarious.The height and position of different piano struck string devices, arrangement, angle are all variant, although can lead to Adjustment optical flame detector position is crossed, but generally compatible poor；Infrastructure cost is expensive but stability is poor, variable because of gravity Shape damage；It is difficult to accurately detect and plays the more information such as dynamics；Multichannel SCM system, circuit is complicated, at high cost.

Summary of the invention

The technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of built-in piano key Action detection device.

In order to solve the above technical problems, the technical solution used in the present invention is: a kind of built-in piano key movement inspection Device is surveyed, is installed below keys and keyboard；Including shell, it is equipped with pcb board in shell, is provided with multiple photoelectric transfers on pcb board Sensor, multiple groups switch module, a single-chip microcontroller, detection circuit and bluetooth module, every group of switch module are correspondingly connected with multiple photoelectric transfers Sensor, the corresponding key of a photoelectric sensor；Shell is equipped with window, and window is provided with lens, and photoelectric sensor includes photoelectricity Transmitter and photelectric receiver, photoemitter emit light and pass through lens by opto-electronic receiver in key bottom reflection across lens Device receives, and photelectric receiver converts electric signal by being transmitted to monolithic after detection circuit amplification detection for the optical signal received Machine, single-chip microcontroller generate midi signal and are uploaded to terminal through bluetooth module.

In above-mentioned technical proposal, the shell includes bottom plate and shell, and pcb board is fixed on bottom plate, and shell is by pcb board lid It closes.

In above-mentioned technical proposal, the bottom plate is metal plate.

In above-mentioned technical proposal, the top shell is plastic shell.

In above-mentioned technical proposal, the key bottom surface is provided with reflective layer, and photoemitter emits light and passes through across lens Reflective layer reflection is received across lens by photelectric receiver.

In above-mentioned technical proposal, the reflective layer is metal reflective paper, is attached to the bottom surface of key.

In above-mentioned technical proposal, the switch module is multiplexer switch or analog switch.

The beneficial effects of the present invention are:

1) it is built in below fingerboard, does not account for key space, do not influence to play, concealed design does not influence the original shape of piano State；

2) built-in to be fixed below fingerboard, using photoelectric sensor detection technique, key contact of getting along well will not cause any Noise；

3) the device back side thickeies aluminium sheet by integration and forms, and multi-point support is fixed when bottom is installed, and infrastructure cost is low, but stablizes Height is unlikely to deform.

4) reflective photoelectric sensor technology is used completely, can detecte out the more information such as the dynamics of playing, duration；

5) multiplexer switch technology is added using single channel single-chip microcontroller, circuit and system are simple, and at low cost, stability is high；

6) piano key is detected, various brands fingerboard consistency is fine, so compatibility is out of question.

Detailed description of the invention

Fig. 1 is overall structure diagram of the invention (before pressing key)；

Fig. 2 is overall structure diagram of the invention (after pressing key)；

Fig. 3 is the schematic illustration of power circuit part of the present invention；

Fig. 4 is the schematic illustration of single chip circuit part of the present invention；

Fig. 5 is the schematic illustration of multiplexing switch circuit part of the present invention；

Fig. 6 is the schematic illustration of inventive sensor circuit part；

Fig. 7 is the schematic illustration of detection circuit part of the present invention；

Fig. 8 is the schematic illustration of Bluetooth circuit part of the present invention.

In figure, 1, bottom plate；2, shell；3, pcb board；4, key；5, photoelectric sensor；51, photoemitter；52, photoelectricity Receiver；6, reflective layer；7, lens.

Specific embodiment

The invention will now be described in further detail with reference to the accompanying drawings.

As shown in Figs. 1-2, a kind of built-in piano key action detection device is installed below 4 keyboard of key；Including Shell, shell is interior to be equipped with pcb board 3, and multiple photoelectric sensors 5, multiple groups switch module, a single-chip microcontroller, inspection are provided on pcb board 3 Slowdown monitoring circuit and bluetooth module, every group of switch module are correspondingly connected with multiple photoelectric sensors 5, the corresponding key of a photoelectric sensor 5 4；Shell is equipped with window, and window is provided with lens 7, and photoelectric sensor 5 includes photoemitter 51 and photelectric receiver 52.Shell Body includes bottom plate 1 and shell 2, and pcb board 3 is fixed on bottom plate 1, and pcb board 3 is covered and closed by shell 2.Bottom plate 1 is metal plate.Top shell is ABS plastic shell 2.4 bottom surface of key is provided with reflective layer 6, and it is anti-through reflective layer 6 across lens 7 that photoemitter 51 emits light Lens 7 were shot through to be received by photelectric receiver 52.Reflective layer 6 is aluminium reflective sheeting, is attached to the bottom surface of key 4, can reinforce light letter Number transmission.Switch module is multiplexer switch or analog switch, is switched in the present embodiment using 11 group of 8 bit multiplex, often Corresponding 8 photoelectric sensors 5 of group multiplex switch.Terminal can be the electronic equipments such as mobile phone or computer, check convenient for user.

Be illustrated in figure 3 power circuit part: USB inputs 5V voltage, exports 3.3V by LDO, gives main board power supply.

It is illustrated in figure 4 single chip circuit part: single-chip microcontroller and peripheral circuit, mainly control reset switch and detection passes Sensor signal variation.

Be illustrated in figure 5 multiplexing switch circuit part: 11 8 bit multiplexs switches, each 8 bit multiplex switch corresponding 8 light Electric transducer 5, corresponding 1 key 4 of each sensor.Single-chip microcontroller chooses single multiplex switch by piece every time, and passes through Address decoding is individually chosen open 1 sensor every time, to individually detect 1 key 4.

It is illustrated in figure 6 sensor circuit part: corresponding 84 keys 4 of 84 sensors.

It is illustrated in figure 7 detection circuit part: when key 4 acts, the enhancing of sensor receiving end received signal, detection electricity Road amplifies signal, and single-chip microcontroller detects the variation of ADC value, so as to detect that key 4 acts.

Be illustrated in figure 8 Bluetooth circuit part: 4 action state of key is sent to bluetooth mould group by serial ports by single-chip microcontroller, It is converted into bluetooth MIDI and uploads to terminal.

Photoemitter 51 emits light and is connect across lens 7 by photelectric receiver 52 across lens 7 in 4 bottom reflection of key It receives, photelectric receiver 52 converts electric signal by passing after detection circuit amplification detection through switch module for the optical signal received Single-chip microcontroller is transported to, single-chip microcontroller generates midi signal and is uploaded to terminal through bluetooth module.

The above embodiments are merely illustrative and not limiting of the invention, therefore all according to described in present patent application range The equivalent change or modification done of method, be included in the scope of the patent application of the present invention.

Claims

1. a kind of built-in piano key action detection device, it is characterised in that: be installed below keys and keyboard；Including shell, Pcb board is equipped in shell, be provided on pcb board multiple photoelectric sensors, multiple groups switch module, a single-chip microcontroller, detection circuit and Bluetooth module, every group of switch module are correspondingly connected with multiple photoelectric sensors, the corresponding key of a photoelectric sensor；Shell is equipped with Window, window are provided with lens, and photoelectric sensor includes photoemitter and photelectric receiver, and photoemitter transmitting light is worn It crosses lens to be received across lens by photelectric receiver in key bottom reflection, photelectric receiver converts the optical signal received to Electric signal is transmitted to single-chip microcontroller after passing through detection circuit amplification detection, and single-chip microcontroller generates midi signal and is uploaded to end through bluetooth module End.

2. a kind of built-in piano key action detection device according to claim 1, it is characterised in that: the shell packet Bottom plate and shell are included, pcb board is fixed on bottom plate, and shell closes pcb board lid.

3. a kind of built-in piano key action detection device according to claim 2, it is characterised in that: the bottom plate is Metal plate.

4. a kind of built-in piano key action detection device according to claim 2, it is characterised in that: the top shell is Plastic shell.

5. a kind of built-in piano key action detection device according to claim 1, it is characterised in that: the key bottom Face is provided with reflective layer, and photoemitter transmitting light passes through lens and connect across lens by photelectric receiver through reflective layer reflection It receives.

6. a kind of built-in piano key action detection device according to claim 5, it is characterised in that: the reflective layer For metal reflective paper, it is attached to the bottom surface of key.

7. a kind of built-in piano key action detection device according to claim 1, it is characterised in that: the switching molding Block is multiplexer switch or analog switch.