CN203232601U - A DSP-Based Piano Electronic Teaching Device - Google Patents

Abstract

The utility model discloses a piano electronic-teaching device based on DSP, and relates to music teaching aids. The piano electronic-teaching device comprises a piano body and a microcomputer control system. Not only the piano body is provided with the structure of a common piano, but also a piano baffle plate on a housing of the piano is provided with a DSP control box, a touch screen, a USB2.0 interface, a female joint of a serial port, a mode-switching switch. The microcomputer control system comprises a DSP control module, a power control module, a music transmission module, a detection alarm module, and a touch-screen man-machine interaction module. The above modules of the microcomputer control system are integrated into the DSP control box. The piano electronic-teaching device has two operating modes of teaching and self-determination exercise, which overcomes the shortcomings of high cost of the modes of one-to-one face-to-face teaching and distance teaching in conventional piano teaching, and tendency to bring inconvenience to piano learners.

Description

A DSP-Based Piano Electronic Teaching Device

technical field

The technical scheme of the utility model relates to music teaching aids, in particular to a DSP-based piano electronic teaching device.

Background technique

The piano is known as the king of musical instruments because of its wide range, rich expressiveness and excellent solo effect. It plays an irreplaceable role in modern music education and music creation.

However, as far as piano teaching is concerned, one-to-one face-to-face teaching is still mostly used at home and abroad, but this teaching method is not only costly, but also often brings a lot of inconvenience to piano learners. CN101145288A discloses a kind of electronic piano teaching system, is a kind of distance teaching system, can bring certain convenience to the piano learner, but its technology is complicated, and cost is too high; CN1218294C discloses a kind of piano automatic performance system, but not It has the function of piano electronic teaching.

Utility model content

The technical problem to be solved by this utility model is: provide a kind of piano electronic teaching device based on DSP, be to introduce microcomputer control system on the basis of traditional piano, have teaching mode and independent practice mode two kinds of work modes, in teaching mode, Piano learners can practice piano playing according to the prompts on the touch screen, so as to quickly and accurately master the piano playing skills, which overcomes the high cost of the existing one-to-one face-to-face teaching and distance teaching methods of piano teaching, and often Can bring the shortcoming of a lot of inconveniences to the piano learner.

The technical scheme adopted by the utility model to solve the technical problem is: a piano electronic teaching device based on DSP, including a piano body and a microcomputer control system; The board is also equipped with DSP control box, touch screen, USB2.0 interface, serial port female, mode switching switch; the microcomputer control system includes DSP control module, power control module, music transmission module, detection alarm module and touch screen human-computer interaction module; Wherein said DSP control module includes DSP control chip and its peripheral circuit, music transmission module includes USB2. , the touch screen human-computer interaction module is the working interface of the touch screen, which includes the start button, the file management button, the music information display area, the pause button, the actual force display bar, the playback status display area, the standard force display bar, the error prompt area and Virtual keyboard area; the connection method of the above modules is: the power control module provides DC voltages of different sizes to the DSP control module, the music transmission module and the touch screen human-computer interaction module, and the music transmission module and the detection and alarm module pass through the pins on the DSP. It is connected with the DSP control module, and the touch screen human-computer interaction module communicates with the DSP control module through a serial port communication circuit; each module of the above-mentioned microcomputer control system is integrated in the DSP control box.

Above-mentioned a kind of piano electronic teaching device based on DSP, the layout mode of the DSP control box, touch screen, USB2.0 interface, serial port female head, mode switching switch that is set on the piano baffle of its shell is that the touch screen is inlaid and fixed on In the center of the piano baffle, the DSP control box is fixed on the lower right side of the piano baffle, the USB2.0 interface and the serial port female head are located on the right side of the DSP control box, and the mode switching switch is located on the upper left of the DSP control box. corner position.

In the aforementioned DSP-based piano electronic teaching device, the DSP control chip is a TMS320F2808DSP chip.

Above-mentioned a kind of piano electronic teaching device based on DSP, the composition of described USB2.0 communication circuit is: its core part is the PDIUSBDI2 chip of special-purpose USB2.0 drive chip PHILIPS company, and the connection mode of circuit is, pin VCC receives After the +5V power supply is grounded through the 100nF capacitor C6, the pin RST is connected to the +5V power supply through the 100nF capacitor C10, and the pin V3 is connected to GND in parallel with the ground through the 100nF capacitor C9, and the X0 and X1 terminals are connected in parallel to the quartz crystal oscillator Y1 And through the 22pF capacitor C7 and the 22pF capacitor C8 to ground, the pin D0~pin D7 is connected with the DSP pin GPIO6~pin GPIO13 correspondingly connected, the pin INT, the pin WR, the pin RD and the pin A0 The pins are respectively connected to the pin GPIO15, pin GPIO16, pin GPIO17 and pin GPIO18 of the DSP. The USB is a USB2.0 interface. The capacitor C5 of the capacitor is grounded, pin 2 and pin 3 are respectively connected to the pin VD+ and pin VD- of U7, and pin 4 is grounded. The above pins are the pins of the PDIUSBDI2 chip.

Above-mentioned a kind of piano electronic teaching device based on DSP, the composition of described bluetooth transceiver circuit is: its core part is special-purpose bluetooth transceiver chip RF2968, and the connection mode of circuit is, pin RESET receives +3.3V by the electric capacity C22 of 100nF Power supply, pin ANI is connected to an external Bluetooth transceiver, pin VCC, pin ON and pin VCCIO are connected to +3.3V power supply in parallel and grounded through 100nF capacitor C20 and 100nF capacitor C21, pin GND1, pin GND2, pin Pin GND3, pin GND4 and pin GND5 are connected to ground in parallel, and pin TXD, pin RXD, pin RTS and pin CTS are respectively connected to DSP pin GPIO20, pin GPIO21, pin GPIO22 and pin GPIO23. The above pins are the pins of the Bluetooth transceiver chip RF2968.

In the above-mentioned DSP-based piano electronic teaching device, the USB communication method is realized by using a dedicated USB2.0 driver chip PDIUSBDI2; the Bluetooth communication method is realized by using the Bluetooth transceiver chip RF2968 as the core.

Above-mentioned a kind of piano electronic teaching device based on DSP, the composition of the sensor feedback circuit of described detection alarm module is: its core part is two-way amplifier integrated chip LM358, and the connection mode of circuit is, the capacitance C23 of sound sensor L1 and 1 μ F is connected in parallel The other end of the sound sensor L1 is connected to the pin INB-, the pin INB+ is connected to the ground in parallel with GND, the pin OUTB is connected to the DSP pin ADCIN0, the pin VCC is grounded through a 10nF capacitor C24, and connected to the ground +5V power supply connected. Unless otherwise specified, the above pins are the pins of the two-way amplifier integrated chip LM358.

Above-mentioned a kind of piano electronic teaching device based on DSP, the composition of the alarm circuit of described detection alarm module is: one end of buzzer LS1 is connected to +5V voltage, the other end is connected to the collector of triode Q1, and the emitter level of triode Q1 is grounded , the base of the transistor Q1 is connected to the pin GPIO24 of the DSP through the resistor R10.

Above-mentioned a kind of piano electronic teaching device based on DSP, the composition of described serial port communication circuit is: its core part is the level conversion chip SP3232EBEN of special-purpose TTL to RS232, and the connection mode of circuit is, pin C1+ and pin C1- Connected through 100nF capacitor C15, pin C2+ and pin C2- are connected through 100nF capacitor C16, pin V1+ is connected to +3.3V power supply through 100nF capacitor C17, pin V- is grounded; pin Vcc is connected in parallel with 100nF Capacitor C18 and 100nF capacitor C19 are connected to pin GND, and pin T1out and pin R1in are grounded through 100pF capacitor C14 and 100pF capacitor C13 respectively, and connected to pin 2 and pin of 9-pin serial port DB9 at the same time 3. The pin R1out and the pin T1in are respectively connected to the SCI serial communication multiplexing pin GPIO28 and the pin GPIO29 of the DSP, and the pin T2in and the pin R2out are connected to the ground in parallel. Unless otherwise specified, the above pins are the pins of the level conversion chip SP3232EBEN.

In the aforementioned DSP-based piano electronic teaching device, the mode switching switch is used to select whether the piano electronic teaching device is in the teaching mode or the independent practice mode.

Above-mentioned a kind of piano electronic teaching device based on DSP, wherein the components and parts involved are all obtained by commercial purchase, and the peripheral circuit of described DSP control chip is well known to those skilled in the art, and the connection of components in all circuits Methods are within the grasp of those skilled in the art.

DSP is the English abbreviation of digital signal processing, and it is an internationally common technical term in this technical field.

The beneficial effects of the utility model are: the utility model electronic piano teaching device overcomes the shortcomings of the existing one-to-one face-to-face teaching and distance teaching methods of piano teaching, which are high in cost and often bring a lot of inconvenience to piano learners, It also has the following advantages:

(1) This utility model is a DSP-based piano electronic teaching device, which opens up a brand-new piano learning method, which is convenient for piano learners to master piano playing skills economically, quickly and conveniently, and can be conveniently used in teaching mode and Switch between independent practice modes, suitable for the needs of learners of different levels.

(2) The utility model is a DSP-based piano electronic teaching device, which adopts touch screen technology and is easy to operate. It can not only provide learners with rich touch methods, but also facilitate learners to manage music files.

(3) A DSP-based piano electronic teaching device of the utility model has sound feedback link and self-adjustment ability. The self-adjustment ability of the device can set different high and low pitch levels according to the playback effect of different music, and serve as DSP tone information The standard is conducive to learners to grasp the touch strength of the piano, so as to play a perfect sound quality.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a schematic diagram of the overall appearance of a DSP-based electronic piano teaching device of the present invention.

Fig. 2 is a schematic block diagram of the microcomputer control system of a DSP-based piano electronic teaching device of the present invention.

Fig. 3 is a schematic diagram of an external connection interface of a TMS320F2808DSP chip used in a DSP-based piano electronic teaching device of the present invention.

Fig. 4 is a USB2.0 communication circuit diagram of a DSP-based electronic piano teaching device of the present invention.

Fig. 5 is a bluetooth transceiver circuit diagram of a DSP-based piano electronic teaching device of the present invention.

Fig. 6 is a circuit diagram of the serial port communication between the touch screen human-computer interaction module and the DSP control module of a DSP-based piano electronic teaching device of the present invention.

7 is a circuit diagram of a detection and alarm module of a DSP-based electronic piano teaching device of the present invention.

Fig. 8 is a schematic diagram of the composition of the touch screen working interface of a DSP-based electronic piano teaching device of the present invention.

In the figure, 1. Piano bezel, 2. Touch screen, 3. DSP control box, 4. USB2.0 interface, 5. Serial port female, 6. Mode switching switch, 7. Start button, 8. File management button, 9 .Music information display area, 10. Pause button, 11. Actual strength display light bar, 12. Playing status display area, 13. Standard strength display light bar, 14. Error prompt area, 15. Virtual keyboard area.

Detailed ways

The embodiment shown in Figure 1 shows that from the overall appearance of a DSP-based piano electronic teaching device of the present invention, the piano body has the composition of an ordinary piano, and the piano baffle (1) of its shell is also provided with a DSP Control box (3), touch screen (2), USB2.0 interface (4), serial port female (5) and mode switch 6. The touch screen (2) is inlaid and fixed at the center of the piano bezel (1), the DSP control box (3) is fixed at the bottom right of the piano bezel (1), the USB2.0 interface (4) and the serial port female connector (5) They are all located on the right side of the DSP control box (3). Learners can import the music files they need through the USB2.0 interface (4), and the serial port female (5) is used for communication between the touch screen (2) and the DSP control box (3); the mode switching switch 6 is located in the DSP control box ( 3) The upper left corner of the box is convenient for learners to choose the working mode of the piano.

The embodiment shown in Fig. 2 shows that the microcomputer control system of a kind of DSP-based piano electronic teaching device of the present utility model comprises a DSP control module, a power supply control module, a music transmission module, a detection alarm module and a touch screen human-computer interaction module; The connection method is: the power supply control module provides DC voltages of different sizes to the DSP control module, the music transmission module and the touch screen human-computer interaction module. The music transmission module and the detection alarm module are connected to the DSP control module through the pins on the DSP. The human-computer interaction module communicates with the DSP control module through the serial port communication circuit; the DSP control module is the core of the entire microcomputer control system and the carrier of the program software, which controls and coordinates the entire device; the music transmission module is provided for learners to import The music files you need; the monitoring and alarm module is used to detect whether the learner's key touch strength is correct, and when an error is detected, the buzzer will alarm to remind the learner to adjust the key touch strength; the touch screen human-computer interaction module is convenient for learners Directly manage and control music files and their playing status, and remind learners of specific key touches and strengths at all times; the power control module is used to provide different voltages to power other modules.

The embodiment shown in Fig. 3 shows the situation of the external connection interface of the used TMS320F2808DSP chip of a kind of DSP-based piano electronic teaching device of the present invention and other each function module, the network label on the DSP chip pin shows that this pin is connected to other each function on the same pins of the core chip of the module. The rest of the control pins and related peripheral circuits are conventional choices of those skilled in the art.

The embodiment shown in Fig. 4 shows that the USB2.0 communication circuit of a kind of DSP-based piano electronic teaching device of the present invention constitutes, wherein U7 is the core part, which is the PDIUSBDI2 chip of the dedicated USB2.0 driver chip PHILIPS company, and the circuit The connection method is that the pin VCC is connected to the +5V power supply and grounded through the 100nF capacitor C6, the pin RST is connected to the +5V power supply through the 100nF capacitor C10, and the pin V3 is connected to the ground in parallel with the GND through the 100nF capacitor C9. The X0 and X1 terminals are connected in parallel with the quartz crystal oscillator Y1 and grounded through the 22pF capacitor C7 and the 22pF capacitor C8, and the pins D0~D7 are connected to the DSP pin GPIO6~pin GPIO13 correspondingly, and the pins INT, pin Pin WR, pin RD and pin A0 are respectively connected to DSP pin GPIO15, pin GPIO16, pin GPIO17 and pin GPIO18. R15 is connected to +5V power supply and grounded through 100nF capacitor C5. Pin 2 and pin 3 are connected to pin VD+ and pin VD- of U7 respectively, and pin 4 is grounded. The above pins are the pins of PDIUSBDI2 chip. foot.

The embodiment shown in Figure 5 shows that the composition of the bluetooth transceiver circuit of a kind of DSP-based piano electronic teaching device of the present utility model is: wherein U9 is the core part, which is a special-purpose bluetooth transceiver chip RF2968, and the connection mode of the circuit is, the pin RESET is connected to +3.3V power supply through 100nF capacitor C22, pin ANI is connected to external Bluetooth transceiver, pin VCC, pin ON and pin VCCIO are connected to +3.3V power supply in parallel through 100nF capacitor C20 and 100nF capacitor C21 Ground, pin GND1, pin GND2, pin GND3, pin GND4 and pin GND5 are connected to ground in parallel, pin TXD, pin RXD, pin RTS and pin CTS are respectively connected to DSP pin GPIO20, pin GPIO21, pin GPIO22 and pin GPIO23, the above-mentioned pins are the pins of the Bluetooth transceiver chip RF2968.

The embodiment shown in Figure 6 shows that the composition of the serial port communication circuit between the touch screen human-computer interaction module of the DSP-based piano electronic teaching device of the utility model and the serial port communication circuit of the DSP control module is: wherein U2 is the core part, which is a dedicated TTL converter RS232 level conversion chip SP3232EBEN, the circuit connection method is that pin C1+ and pin C1- are connected through 100nF capacitor C15, pin C2+ and pin C2- are connected through 100nF capacitor C16, and pin V1+ is connected through 100nF capacitor C16. Capacitor C17 is connected to +3.3V power supply, pin V- is grounded; pin Vcc is connected to pin GND through parallel connection of 100nF capacitor C18 and 100nF capacitor C19, pin T1out and pin R1in are respectively connected to 100pF capacitor C14 and The 100pF C13 capacitor is grounded and connected to pin 2 and pin 3 of the 9-pin serial port DB9 at the same time, and the pin R1out and pin T1in are respectively connected to the SCI serial communication multiplexing pin GPIO28 and pin GPIO29 of the DSP , the pin T2in is connected to the ground in parallel with the pin R2out. Unless otherwise specified, the above pins are the pins of the level conversion chip SP3232EBEN.

The embodiment shown in Fig. 7 shows that the detection alarm module circuit of a kind of DSP-based piano electronic teaching device of the present invention comprises the formation of sensor feedback circuit and alarm circuit, wherein the sensor feedback circuit is on the left, and the alarm circuit is on the right.

The composition of the above-mentioned sensor feedback circuit is: where U10 is the core part, which is a two-way amplifier integrated chip LM358. The connection mode of the circuit is that one end of the parallel connection between the sound sensor L1 and the 1μF capacitor C23 is grounded, and the other end of the sound sensor L1 is connected to Pin INB-, pin INB+ are connected to GND in parallel, pin OUTB is connected to DSP pin ADCIN0, pin VCC is grounded through 10nF capacitor C24, and connected to +5V power supply, the above pins are not specified otherwise In addition, they are the pins of the two-way amplifier integrated chip LM358.

The composition of the above alarm circuit is: one end of the buzzer LS1 is connected to +5V voltage, the other end is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, and the base of the transistor Q1 is connected to the DSP pin GPIO24 through the resistor R10 superior.

The embodiment shown in Fig. 8 shows that a kind of touch screen work interface composition of the piano electronic teaching device based on DSP of the present utility model is: comprise start button 7, file management button 8, music information display area 9, pause button 10, Actual force display bar 11 , playing state display area 12 , standard force display bar 13 , error prompt area 14 and virtual keyboard area 15 . Wherein the function of each button all has mark; Music information display area 9 is used for displaying information such as title and author of the music played; Indicate its error type when the key is wrong; the virtual key area 15 is composed of virtual keys corresponding to the keys one by one. Prompt the learner to press the key. The standard force shows that the height of the beam 13 is the standard force for the learner's reference. If the device has an alarm sound, the learner can adjust his key force according to it.

Example 1

According to the device configuration and modulation of the embodiments shown in the above-mentioned Figures 1 to 9, a DSP-based piano electronic teaching device in this embodiment, wherein the DSP control module is the core of the entire control part, and is also the operating carrier of the program algorithm. The selection should ensure the real-time and accuracy of the control part; the music transmission module is used to receive the music to be played, and then send it to the DSP control module, and decode the received music into a series of data containing note information, among which The note information includes note, volume, and beat; the volume feedback device and alarm device of the detection alarm module are used to collect the volume emitted by the piano, and feed back to the DSP, and compare it with the standard volume level given by this device, so as to judge learning If the intensity of the touch keys is appropriate, the corresponding alarm device will send out an alarm sound to remind the learners to adjust the intensity of the keys; the touch screen human-computer interaction module adopts touch screen control technology. On the one hand, relevant display and control buttons are set. It is used to manage music files and display the playback status. On the other hand, virtual keys corresponding to the piano keys and two light beams are set up. The virtual keys are used to remind learners of the keys to be pressed, and the light beams are used to indicate the touch of the keys. One of the light beams represents the standard volume given by the device, and the other light beam represents the actual volume produced by the learner due to the different strength of the key. DSP analyzes the decoded note information and calculates the key to be pressed in real time. and the strength of the touch key, and drive the corresponding virtual key to emit light, and at the same time make the above-mentioned standard strength display light column reach the corresponding height; the touch screen human-machine interface program is written for the human-computer interaction interface, aiming to realize the interaction between the learner and the device. The information is fed back to each other to guide the learners to complete the piano playing exercises.

The specific workflow of applying the DSP-based piano electronic teaching device of this embodiment to carry out piano learning and teaching is as follows:

(1) Start a DSP-based piano electronic teaching device of the present invention, and learners play the standard performance of the music file they want to practice near the piano. During this process, the DSP control module reads and stores the volume information detected by the sound sensor in real time, extracts the lowest volume and the highest volume from it, and divides the volume interval it constructs into ten different volume intervals according to the decibel numbers of the two. Level, and then determine the level corresponding to each note in the music one by one, and express this level with the height of the standard strength display light beam. The higher level indicates higher volume, and the lower level indicates lower volume. As a reference standard for learners to press the keys, the device has self-learning ability in setting the key touch level, so as to set its unique volume level for different melodies.

(2) Learners choose a way to import music files according to their needs, and select the working mode of the device through the switch. If they choose the independent practice mode, that is, the switch cuts off the microcomputer control part, and the device works in the normal piano mode; if they choose to teach mode, then cooperate with the file management button on the touch screen to select music files and send them to the DSP control module for processing.

(3) The learner presses the start button 7 on the touch screen (2) to start the learning process, and practice according to the key prompts and volume prompts on the touch screen (2).

(4) During the whole learning process of the learner, the sound sensor continuously detects the actual sound of the piano keys, and sends it to the DSP control module to compare with the corresponding standard volume level, so as to judge whether the learner's key touch is moderate, if not Then the alarm device reports to the police, and now the learner can temporarily stop the playing process by the pause button 10 on the touch screen, and adjust the key-touch strength.

Claims (9)

1. a kind of piano electronic teaching device based on DSP, it is characterized in that: comprise piano body and microcomputer control system; Wherein, piano body is also provided with DSP control box on the piano baffle plate of its shell except having the composition of common piano , touch screen, USB2.0 interface, serial port female head, mode switching switch; the microcomputer control system includes DSP control module, power supply control module, music transmission module, detection alarm module and touch screen human-computer interaction module; wherein said DSP control module includes DSP Control chip and its peripheral circuits, music transmission module includes USB2.0 communication circuit and Bluetooth transceiver circuit, and adopts USB communication mode and Bluetooth communication mode, detection alarm module is composed of sensor feedback circuit and alarm circuit, touch screen human-computer interaction module is touch screen The interface includes the start button, the file management button, the music information display area, the pause button, the actual strength display light column, the playback status display area, the standard force display light column, the error prompt area and the virtual keyboard area; the connection of the above modules The method is: the power supply control module provides DC voltages of different sizes to the DSP control module, the music transmission module and the touch screen human-computer interaction module. The music transmission module and the detection alarm module are connected to the DSP control module through the pins on the DSP. The computer interaction module communicates with the DSP control module through a serial port communication circuit; each module of the above-mentioned microcomputer control system is integrated in the DSP control box. 2. according to claim 1 said a kind of piano electronic teaching device based on DSP, it is characterized in that: the DSP control box, touch screen, USB2.0 interface, serial port female head, mode switch that are arranged on the piano baffle of described its shell The layout of the switch is that the touch screen is inlaid and fixed in the center of the piano baffle, the DSP control box is fixed at the bottom right of the piano baffle, the USB2.0 interface and serial port female are located on the right side of the DSP control box, the mode The toggle switch is located at the upper left corner of the box surface of the DSP control box. 3. according to the said a kind of DSP-based piano electronic teaching device according to claim 1, it is characterized in that: said DSP control chip selects TMS320F2808DSP chip for use. 4. according to claim 1 said a kind of piano electronic teaching device based on DSP, it is characterized in that: the composition of described USB2.0 communication circuit is: its core part is the PDIUSBDI2 chip of special-purpose USB2.0 drive chip PHILIPS company, The connection method of the circuit is that the pin VCC is connected to the +5V power supply and grounded through the 100nF capacitor C6, the pin RST is connected to the +5V power supply through the 100nF capacitor C10, and the pin V3 is connected to GND in parallel with the ground through the 100nF capacitor C9 , the X0 and X1 terminals are connected in parallel with the quartz crystal oscillator Y1 and grounded through the 22pF capacitor C7 and the 22pF capacitor C8, and the pins D0~D7 are connected with the DSP pin GPIO6~pin GPIO13 correspondingly, and the pins INT, Pin WR, pin RD and pin A0 are respectively connected to DSP pin GPIO15, pin GPIO16, pin GPIO17 and pin GPIO18, USB is USB2.0 interface, and its connection method is that pin 1 passes Resistor R15 is connected to +5V power supply, and grounded through 100nF capacitor C5, pin 2 and pin 3 are respectively connected to pin VD+ and pin VD- of U7, pin 4 is grounded, and the above pins are PDIUSBDI2 chip pin. 5. said a kind of piano electronic teaching device based on DSP according to claim 1, it is characterized in that: the composition of described bluetooth transceiver circuit is: its core part is special-purpose bluetooth transceiver chip RF2968, and the connection mode of circuit is, pin RESET is connected to +3.3V power supply through 100nF capacitor C22, pin ANI is connected to external Bluetooth transceiver, pin VCC, pin ON and pin VCCIO are connected to +3.3V power supply in parallel through 100nF capacitor C20 and 100nF capacitor C21 Ground, pin GND1, pin GND2, pin GND3, pin GND4 and pin GND5 are connected to ground in parallel, pin TXD, pin RXD, pin RTS and pin CTS are respectively connected to DSP pin GPIO20, pin GPIO21, pin GPIO22 and pin GPIO23, the above-mentioned pins are the pins of the Bluetooth transceiver chip RF2968. 6. according to claim 1 said a kind of piano electronic teaching device based on DSP, it is characterized in that: described USB communication mode adopts special-purpose USB2.0 driver chip PDIUSBDI2 to realize; core to achieve. 7. according to claim 1 said a kind of piano electronic teaching device based on DSP, it is characterized in that: the composition of the sensor feedback circuit of described detection alarm module is: its core part is two-way amplifier integrated chip LM358, the connection mode of circuit Yes, one end of the parallel connection between the sound sensor L1 and the 1μF capacitor C23 is grounded, the other end of the sound sensor L1 is connected to the pin INB-, the pin INB+ is connected to the ground in parallel, and the pin OUTB is connected to the DSP pin ADCIN0. The pin VCC is grounded through a 10nF capacitor C24 and connected to the +5V power supply. Unless otherwise specified, the above pins are the pins of the two-way amplifier integrated chip LM358. 8. said a kind of piano electronic teaching device based on DSP according to claim 1, it is characterized in that: the formation of the alarm circuit of described detection alarm module is: one end of buzzer LS1 is connected to +5V voltage, and the other end is connected to triode The collector of Q1 and the emitter of the triode Q1 are grounded, and the base of the triode Q1 is connected to the pin GPIO24 of the DSP through the resistor R10. 9. Said a kind of piano electronic teaching device based on DSP according to claim 1, it is characterized in that: the composition of described serial port communication circuit is: its core part is the level conversion chip SP3232EBEN of special-purpose TTL to RS232, the connection of circuit The method is that pin C1+ and pin C1- are connected through 100nF capacitor C15, pin C2+ and pin C2- are connected through 100nF capacitor C16, pin V1+ is connected to +3.3V power supply through 100nF capacitor C17, pin V-ground; pin Vcc is connected to pin GND through parallel connection of 100nF capacitor C18 and 100nF capacitor C19, pin T1out and pin R1in are respectively grounded through 100pF capacitor C14 and 100pF capacitor C13, and are respectively connected to The pin 2 and pin 3 of the 9-pin serial port DB9, the pin R1out and the pin T1in are respectively connected to the SCI serial communication multiplexing pin GPIO28 and the pin GPIO29 of the DSP, and the pin T2in and the pin R2out are connected in parallel to the ground. Unless otherwise specified, the above pins are the pins of the level conversion chip SP3232EBEN.

Images