CN111739481A - A kalimba playing aid device - Google Patents

Abstract

The invention discloses a karinba playing auxiliary device which comprises a shell, a circuit board, a power supply, a loudspeaker and a touch key. The shell is embedded into the clip pressing structure through the U-shaped groove. The circuit board consists of a microprocessor and necessary peripheral capacitance resistance inductance elements thereof, an LED dot matrix display screen, a power management chip and a power switch. The LED dot matrix display screen is used for displaying keys corresponding to current musical notes to be played and keys corresponding to the musical notes to be played in the music score from top to bottom like running water in the display screen above the keys when the Carlin bar is played. The system integrates a complete human-computer interaction interface, can finish human-computer interaction operation of all functions by independent use, can realize human-computer interaction of all functions without external human-computer interaction equipment such as a mobile phone, a tablet personal computer and the like, and can download and update a music score library through a network, so that available music scores are not limited to the number of built-in limited music scores when leaving a factory, and the coverage range of the music scores is greatly improved. Meanwhile, the built-in program, data and the like can be updated through the network, so that the built-in program can be continuously upgraded. It can also automatically convert music into music scores and add the converted music scores to its own music score library. It can also score the player's playing level.

Description

A kalimba playing aid device

technical field

The present invention relates to the technical field of musical instrument equipment named kalimba, in particular to an auxiliary device for playing kalimba.

Background technique

Kalimba (transliteration of the English name Kalimba) is an ancient musical instrument originating from Africa. done) named after it. The sounding body part of the Kalimba is the elastic metal strips of different lengths on the top, and the wood or gourd melon is used as a resonance box on the bottom. Kalimba is becoming more and more popular with young people due to its ethereal, melodious voice. However, as an instrument, players usually need to have a certain knowledge of music theory in order to play meaningful repertoires, which makes it difficult for non-professionals to master this instrument; even professionals, when playing a piece for the first time When playing, the eyes frequently switch between the score and the keys, which is prone to errors. If there is a playing aid that can be installed on the keys, it can guide the player step by step through the display screen to play the corresponding notes of the score, which will greatly reduce the difficulty of getting started with the kalimba.

The purpose of the present invention is to provide a kalimba playing auxiliary device, which has built-in several music scores, and can display the keys to be played and the keys to be played in the music score from top to bottom like flowing water in the display screen above the keys. This display enables the player to play the entire piece of music as long as the player plays the corresponding keys in sequence according to the key positions indicated on the display screen, thereby reducing the learning difficulty of Kalimba.

SUMMARY OF THE INVENTION

The technical scheme adopted in the present invention is as follows: an auxiliary device for kalimba playing, comprising a casing, a circuit board, a power supply, a speaker and a touch key.

There is a U-shaped groove at the bottom of the casing, viewed from the side, and the Kalimba playing auxiliary device is embedded into the Kalimba shrapnel pressing structure through the U-shaped groove on the casing. The arrangement of the U-shaped groove enables the kalimba to be easily installed on the kalimba and can be quickly removed from the kalimba without affecting the performance and structure of the kalimba.

The circuit board is composed of a microprocessor and its necessary peripheral capacitance, resistance and inductance elements, an LED dot matrix display screen, an LED driver, an OLED display screen, a microphone, an audio amplifier, a power management chip and a power switch.

Preferably, the microprocessor is a single-chip wireless system-on-a-chip (SoC) integrated with Wi-Fi, and has the ability to connect to the Internet through a WIFI wireless local area network, so that the kalimba playing auxiliary device has a built-in update through the network. Program, data, and library capabilities.

The power source is 2 AAA dry batteries or a lithium battery, one of which can be selected according to needs.

The said LED dot matrix display screen is used for kalimba playing auxiliary prompts.

The LED driver is used for driving the LED dot matrix display screen.

The OLED display screen is used to display human-computer interaction interfaces such as menu options, tracks, and status.

The audio amplifier and the loudspeaker are used to play the music corresponding to the score, so that the player can know what the score should look like before playing, so as to serve as a reference.

The touch button is used for human-computer interaction, so that the kalimba playing auxiliary device can realize human-computer interaction of all functions without external human-computer interaction devices such as mobile phones and tablet computers.

The microphone is used for recognizing and feeding back the sound played, so that the kalimba playing auxiliary device is capable of performing pitch calibration for the kalimba, scoring the played track, or automatically Advanced features for converting to sheet music.

The power management chip is used to convert the unstable voltage of the battery into a stable 3.3V voltage for use in other circuits such as microprocessors.

The power switch button is the main power switch of the kalimba playing auxiliary device.

The present invention has the following outstanding innovations: 1. The Kalimba playing auxiliary device integrates a complete human-computer interaction interface, which can complete the human-computer interaction operation of all functions when used alone, and does not need to interact with external human-computer interaction through a wireless communication module Devices (such as mobile phones, tablets, etc.) are connected, thereby reducing costs and improving ease of use.

2. The kalimba playing auxiliary device uses a dot-matrix LED display, which can display the current note to be played and several single notes to be played on the same screen, and these notes can follow like flowing water. The time rhythm moves from top to bottom, allowing the player to predict the notes that will be played, thereby improving the accuracy and reducing the difficulty of playing.

3. The Kalimba playing auxiliary device is installed on the shrapnel pressing structure of the Kalimba using a U-shaped slot, and can be firmly connected to the Kalimba without any changes to the structure of the Kalimba itself, and When the kalimba playing aid is not in use, it can be easily removed from the kalimba by sliding it sideways.

4. Preferably, the kalimba playing auxiliary device can download and update the music score library through the network, so that the available music scores are no longer limited to the limited number of music scores built in the factory, and the coverage of the music scores is greatly improved. At the same time, the built-in program and data can be updated through the network, so that the built-in program can be continuously upgraded.

5. Preferably, the kalimba playing assistant device can automatically convert music into scores, and add the converted scores to its own score library.

6. Preferably, the kalimba playing aid device can also score the player's playing level.

Description of drawings

Figure 1 is a front view of the Kalimba structure.

Figure 2 is a front view and a right side view of the present kalimba playing auxiliary device.

Fig. 3 is a front view and a right side view of the present kalimba playing auxiliary device installed on the kalimba.

Figure 4, Figure 5, and Figure 6 are descriptions of the running water note prompt.

FIG. 7 is a block diagram of the circuit system of the present kalimba playing auxiliary device.

Figure 8 is a circuit schematic diagram of the present kalimba playing auxiliary device.

Fig. 9 is a flow chart of the internal program of the microprocessor of the present kalimba playing aid device.

Detailed ways

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described technical solution is not the only embodiment of the present invention, and all other embodiments obtained by those of ordinary skill in the art from the embodiments of the present invention without creative work belong to The scope of protection of the present invention.

As shown in FIG. 1 , a kalimba is generally composed of a body 1 , keys 2 , key support bases 3 and 6 , a key depression structure 4 , a key pillow 5 and a sound hole 7 .

The appearance structure of the Kalimba playing aid device is shown in Figure 2, which is composed of an OLED display screen 7, a touch button 8, an LED dot matrix display screen 9, a casing 10 and a U-shaped groove 11 on the casing.

FIG. 3 shows how the embodiment of the kalimba playing aid device is installed and fixed to the key pressing structure 4 of the kalimba through the U-shaped groove 11 on the casing.

Figure 4, Figure 5, and Figure 6 illustrate the concept of flowing note cues. The LED dot-matrix display is used to indicate the current notes to be played and the number of notes to be played. The bottom row of LEDs indicates the position of the keys corresponding to the notes currently to be played, and the positions of the keys corresponding to the notes to be played are displayed in sequence upwards. . Whenever the current note is played, all the notes indicated on the LED dot matrix display move down one line, and the first note to be played becomes the current note to be played, and so on and so forth until all the notes in the score are played. Taking the seven notes of "1", "2", "3", "4", "5", "6" and "7" played in sequence as an example, the LED dot matrix display in Figure 4 goes from the bottom to the top The first row of the count indicates that the current note to be played is "1", the second row indicates that the first note to be played is "2", the third row indicates that the second note to be played is "3", and so on analogy……. When the note "1" is played, the content displayed on the LED dot matrix display moves down one line as a whole, as shown in Figure 5, the current note to be played becomes "2", and the second line indicates the first to be played The note is "3", the third line indicates the second note to be played is "4", and so on…. When the note "2" is played, the content displayed on the LED dot matrix display will move down one line again, as shown in Figure 6, the current note to be played becomes "3", and the second line indicates the first line to be played. The first note is "4", the third line indicates that the second note to be played is "5", and so on...and so on until the last note "7" is played. This is the concept of the flowing note prompt.

FIG. 7 shows a block diagram of the circuit system of an embodiment of the present kalimba playing aid. The circuit system of this embodiment is composed of a power supply, a power switch, a power management chip, a microprocessor, an LED driver, an LED dot matrix display screen, an OLED display screen, a microphone, an audio amplifier, a speaker and a corner touch button. The specific implementation of this embodiment will be described in detail below with reference to the circuit schematic diagram shown in FIG. 8 .

In this embodiment, a single-chip wireless system-on-chip (SoC) ESP32 is selected as the microprocessor, which integrates a high-performance RISC core, an I2C interface, an SPI interface, a touch key interface, an analog-to-digital converter ADC, and a digital-to-analog converter. Rich peripherals such as DAC, as well as WIFI wireless network and FLASH memory.

In FIG. 8 , the battery is used as the power supply of this embodiment, and its positive pole is connected to pins 5 and 8 of the power management chip SR1545, and its negative pole is connected to pins 3, 9 and 11 of SR1545. The ON/OFF ends of the power switch are respectively connected to the enable pin EN (pin 6) of the SR1545 and the positive electrode of the battery. When the power switch ON/OFF is pressed, the power management chip SR1545 starts to work and stabilizes the unstable battery voltage to 3.3V together with the inductor L1, capacitors C2, C3 and resistors R1, R2. Among them, R1 and R2 are output voltage feedback voltage divider resistors, which are used to set the size of the output voltage. In this embodiment, the output voltage is set to 3.3V. C2 is the input decoupling capacitor, C3 is the output filter capacitor, and L1 is the Buck-Boost inductor. The 3.3V voltage output by the power management chip is connected to the EN pin and 3V3 pin of the microprocessor ESP32, the VDD and VCOMH pins of the OLED display, the VCC pin of the LED driver chip XM1232, the microphone MIC1 and VDD pins, and the audio The VCC pin of the amplifier DP1325 is used as the working power supply of these parts. As the general controller of the circuit system, the microprocessor realizes all the logic functions of the circuit system through its internal program. C1 is the decoupling capacitor of the microprocessor ESP32. The OUT pin of the microphone MIC1 is connected to the IO35 pin of the microprocessor ESP32. In the ESP32 internal program, configure the IO35 pin as the input pin of the ESP32 internal analog-to-digital converter ADC, so that after the microphone converts the sound signal into a voltage signal, the ESP32 samples through its internal ADC, converts it into a digital signal and stores it in in its internal RAM memory for further processing by internal programs. The OLED display is connected to the I2C bus of the ESP32 through the SCL and SDA pins, so the program inside the ESP32 can control the content displayed on the OLED through the I2C bus. C5 is the decoupling capacitor of the OLED display, and R5 is the brightness adjustment resistor of the OLED. Changing the resistance of R5 can change the display brightness of the OLED display. The ROW0-ROWn and COM0-COM8 pins of the LED driver XM1232 are respectively connected to the ROW0-ROWn and COM0-COM8 pins of the LED dot matrix display, thereby driving the LED dot matrix display. The LED driver XM1232 is connected to the I2C bus of the ESP32 through the SCL and SDA pins like the OLED, where R3 and R4 are the pull-up resistors of the I2C bus. C6 is the decoupling capacitor of the LED driver XM1232. After the digital sound signal generated by the internal program of ESP32 is converted into an analog voltage signal by its internal digital-to-analog converter DAC1, it is output through the IO25 pin, and is coupled to the non-inverting input terminal INP of the audio amplifier DP1325 through the capacitor C8 and the resistor R6. After the amplifier DP1325 is amplified, it pushes the speaker LS1 to sound through the low-pass filter network composed of the inductors L2, L3 and the capacitors C7 and C10. Among them, C9 and R7 are the inverting input coupling capacitor resistors of the audio amplifier, and C11 is the decoupling capacitor of the audio amplifier. TPAD1 and TPAD2 are touch buttons, which are connected to the capacitive touch input pins IO15, IO16, IO17 and IO18 of ESP32 through network labels T1, T, T3 and T4 respectively.

FIG. 9 shows a flowchart of the built-in program of the microprocessor of this embodiment. When the power switch is pressed, the microprocessor powers on reset and begins the hardware initialization process. After the hardware is initialized, the OLED display displays the human-computer interaction menu options and starts to detect whether the touch button is pressed. If the corresponding touch key press is detected, the menu cursor is moved to select the corresponding option.

If the option "Select Score" is selected, the sub-menu of score selection is entered. After the user selects the corresponding score by touching the keys, the LED dot matrix display starts to display the corresponding note prompts of the score. At the same time, the microphone starts to work. When the microprocessor detects that the current note is played through the microphone, it updates the display content of the LED dot matrix display and moves down one line. If the song is played, the program will return to the main menu option interface, otherwise it will return to the main menu option interface. Continue to detect whether the current note is played. If it is played, update the display content of the LED dot matrix display and move down one line until the track is played. After the repertoire is played, it will prompt whether to score the level you just played. If you choose yes, score and display the score, and then return to the main menu option interface, otherwise return directly to the main menu option interface.

If the option "Download and update music library via wireless network" is selected, the program will download and update the music library, and then return to the main menu interface.

If the option "Download and update the built-in program via wireless network" is selected, the program will download and update the built-in program of the microprocessor, and then return to the main menu interface.

If the option "Convert music to score" is selected, the program will record the music with a microphone and run the score conversion program. After the conversion is completed, the new score will be saved to the score library, and then return to the main menu interface.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. The utility model provides a karinba auxiliary device that plays which characterized in that: the loudspeaker comprises a shell, a circuit board, a power supply, a loudspeaker and a touch key; the shell is embedded into the clip pressing structure through the U-shaped groove;

the circuit board consists of a microprocessor and necessary peripheral capacitance resistance inductance elements thereof, an LED dot matrix display screen, a power management chip and a power switch;

the LED dot matrix display screen is used for displaying keys corresponding to current musical notes to be played in a music score and keys corresponding to the musical notes to be played in the display screen above the keys from top to bottom like flowing water when the Carlin bar is played.

2. The karinba playing aid of claim 1, wherein: the circuit board and the elements connected with the circuit board also comprise an OLED display screen, a microphone, an audio amplifier and a loudspeaker connected to the audio amplifier; the signal output end of the microphone is connected to the input end of an analog-digital converter (ADC) arranged in the microprocessor, and a sound signal is converted into a digital signal through the ADC and then is stored in a RAM in the microprocessor for program use.

3. The karinba playing assisting device according to claim 1, characterized in that the device has a complete human-computer interaction interface, and can complete human-computer interaction of all functions without being connected with external human-computer interaction equipment in a wired or wireless communication mode.

4. Preferably, the kalinba playing assisting device according to claim 1, wherein the download and update of the music library are performed through a wireless connection to the internet.

5. Preferably, the kalinba playing assisting device according to claim 1, is characterized in that the device is provided with a function of updating and upgrading self programs and data through a wireless connection with the internet.

6. Preferably, the kalinba playing assisting device according to claim 1, which is characterized by having a function of automatically converting music into music score, and as long as a piece of music is recorded by a microphone, the built-in program can automatically convert the piece of music into music score and store the music score in the music score library.

7. Preferably, the kalinba playing assisting device according to claim 1 is characterized by having a function of scoring the playing level of the kalinba player, so that the player can objectively judge his own playing technology, thereby helping the player to continuously improve his own playing level.

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