Music interactive display teaching equipment

Abstract

The invention relates to the field of science popularization teaching equipment, and discloses music interaction display teaching equipment which comprises a transmitting coil assembly, the transmitting coil assembly comprises a signal generator and a transmitting coil, the signal generator generates alternating current electric signals with different frequencies in a manual triggering mode, and the alternating current electric signals are loaded to the transmitting coil to enable the transmitting coil to generate an alternating magnetic field; the receiving coil assembly is arranged corresponding to the transmitting coil assembly and comprises a receiving coil, and when the transmitting coil assembly generates an alternating magnetic field, the receiving coil assembly generates induced electromotive force in the alternating magnetic field; and the audio processing module is used for filtering and amplifying the induced electromotive force signal generated by the receiving coil assembly. More complex and diversified induced electromotive force signal combinations are achieved through different coil arrangement modes, selection of various states is provided for equipment, and more innovation possibilities are provided for students or professionals pursuing unique music creation effects.

Description

Technical Field

[0001] The present invention relates to the field of popular science teaching equipment, in particular to music interactive display teaching equipment. Background Art

[0002] In current education, there's a growing demand for integrated interdisciplinary teaching, particularly in the integration of physical electromagnetism with music and art. Traditional teaching equipment and methods are often limited to imparting knowledge from a single subject, failing to effectively stimulate students' interest in and desire to explore interdisciplinary knowledge. In electromagnetism instruction, students struggle to grasp the abstract principles of electromagnetic induction and connect them to practical applications.

[0003] However, in music teaching, students lack a deep understanding of the physical principles behind music and are unable to understand the fundamental mechanism of music generation and change. Existing teaching tools cannot provide students with a platform where they can intuitively feel the close connection between electromagnetic induction and music creation, nor can they meet the diverse and personalized teaching needs. Therefore, there is an urgent need for an innovative teaching device that can break down disciplinary barriers and help students understand and master the knowledge related to electromagnetism and music in a vivid, interesting and interactive way. Summary of the Invention

[0004] In view of the deficiencies of the existing technology, the present invention provides a music interactive display teaching device, which solves the problem that the existing teaching tools have a single function.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a music interactive display teaching device, comprising:

[0006] A transmitting coil assembly, comprising a signal generator and a transmitting coil. The signal generator is manually triggered to generate alternating current signals of different frequencies, which are then applied to the transmitting coil to generate an alternating magnetic field.

[0007] A receiving coil assembly, which is arranged corresponding to the transmitting coil assembly and includes a receiving coil. When the transmitting coil assembly generates an alternating magnetic field, the receiving coil assembly generates an induced electromotive force in the alternating magnetic field;

[0008] An audio processing module, which is used to filter and amplify the induced electromotive force signal generated by the receiving coil assembly, further analyze the signal after amplification, convert the time-domain audio signal into the frequency domain through the mathematical algorithm of Fourier transform, obtain the frequency components and amplitude information of the signal, and convert this frequency and amplitude information into visual elements of the image according to preset mapping rules;

[0009] A speaker is driven by the amplified signal and emits a sound corresponding to the signal;

[0010] The visualization module is used to receive visual element signals and display them in the form of images.

[0011] Preferably, the signal generator includes a multi-contact resistor, one contact of the multi-contact resistor is connected to a pin of the transmitting coil, and corresponding manual trigger devices are provided above the remaining contacts, the manual trigger device is connected to one electrode of the power supply, and the other electrode of the power supply is connected to the other pin of the transmitting coil.

[0012] Preferably, the manual trigger device includes a guide plate, which is connected to an electrode of the power supply, and a plurality of probes are passed through and slidably connected to the plate body of the guide plate, and the plurality of probes correspond one-to-one to the remaining contacts of the multi-contact resistor. A button is fixedly connected to the top of the probe, and a spring is provided on the outer wall of the probe. One end of the spring is fixedly connected to the upper surface of the guide plate, and the other end is fixedly connected to the lower wall of the button. The lower wall of the button is also fixedly connected to a contact piece, and the contact piece is connected to the probe. When the button is pressed down to make the contact piece contact with the guide plate, the probe and the guide plate are conductive.

[0013] Preferably, the audio processing module includes a filtering circuit, an amplifying circuit, a shaping circuit and a conversion circuit, wherein the filtering circuit is based on a specific circuit structure formed by electronic components, and based on the different impedance characteristics presented by different frequency signals in the circuit, it filters the signal and removes high-frequency noise and low-frequency interference in the signal. The amplifying circuit is based on an operational amplifier, and amplifies the input induced electromotive force signal to an amplitude sufficient to drive the speaker. The shaping circuit shapes and modulates the amplified signal so that its waveform better meets the requirements of the audio signal. The conversion circuit is used to convert the shaped and modulated signal into an image signal.

[0014] Preferably, there are multiple transmitting coils and receiving coils, which are arranged in a matrix, forming a rectangular grid, and are evenly spaced in the horizontal and vertical directions.

[0015] Preferably, there are multiple transmitting coils and receiving coils, which are arranged in concentric circles. With the center point as the reference, the number of induction coils increases gradually from the inside to the outside or remains unchanged.

[0016] Preferably, there are multiple transmitting coils and receiving coils, which are arranged in a staggered manner, and coils in adjacent rows on a plane are staggered by half a coil spacing.

[0017] Preferably, there are multiple transmitting coils and receiving coils, and they are arranged in layers, with multiple layers provided in a three-dimensional space, and each layer is provided with an adjustment device for adjusting the spacing between the layers.

[0018] The present invention provides a music interactive display teaching device with the following beneficial effects:

[0019] By converting electromagnetic induction signals into audible music and visual images, the present invention enables students to understand abstract electromagnetic principles more intuitively and improve learning outcomes. This intuitive teaching experience helps students better master knowledge and stimulates their interest in science and art. Different coil arrangements achieve more complex and diverse combinations of induced electromotive force signals, providing the device with a variety of state options, and providing more innovative possibilities for students or professionals pursuing unique music creation effects. The use of a manually triggered signal generator and an adjustable layer spacing scheme greatly improves student participation and enthusiasm. Students can observe changes in music and images in real time through their own operations, which enhances the fun and exploratory nature of learning. The organic combination of electromagnetism and music art provides students with a platform for interdisciplinary learning. Through practical operation and observation, students can deeply understand the application of electromagnetic induction principles in music creation and presentation, break down disciplinary barriers, and cultivate students' interdisciplinary thinking ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a music interactive display teaching equipment system of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection between the transmitting coil, the receiving coil and the multi-contact resistor in the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 Schematic diagram of the arrangement of the transmitting coil 1 and the receiving coil 2 in the second embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the arrangement of the transmitting coil 1 and the receiving coil 2 in the third embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the arrangement of the transmitting coil 1 and the receiving coil 2 in the fourth embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the arrangement of the transmitting coil 1 and the receiving coil 2 in the fifth embodiment of the present invention.

[0027] Among them, 1. Transmitting coil; 2. Receiving coil; 3. Multi-contact resistor; 4. Power supply; 5. Guide plate; 6. Probe; 7. Button; 8. Spring; 9. Contact piece. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1:

[0030] Please see the attached Figure 1 -Attached Figure 3 The embodiment of the present invention provides a music interactive display teaching device, comprising:

[0031] The transmitting coil assembly includes a signal generator and a transmitting coil 1. The signal generator uses manual triggering to generate alternating current signals of different frequencies, which are loaded onto the transmitting coil 1 to generate an alternating magnetic field. The signal generator includes a multi-contact resistor 3. One contact of the multi-contact resistor 3 is connected to a pin of the transmitting coil 1, and corresponding manual trigger devices are provided above the remaining contacts. The manual trigger device is connected to one electrode of the power supply 4, and the other electrode of the power supply 4 is connected to another pin of the transmitting coil 1. The manual trigger device includes a guide plate 5, which is connected to an electrode of the power supply 4. A plurality of probes 6 are penetrated and slidably connected to the plate body of the guide plate 5. The plurality of probes 6 correspond one to one with the remaining contacts of the multi-contact resistor 3. A button 7 is fixedly connected to the top of the probe 6. A spring 8 is sleeved on the outer wall of the probe 6. One end of the spring 8 is fixedly connected to the upper surface of the guide plate 5, and the other end is fixedly connected to the lower wall of the button 7. The spring 8 plays a resetting role. A contact piece 9 is also fixedly connected to the lower wall of the button 7. The contact piece 9 is connected to the probe 6. When the button 7 is pressed down to make the contact piece 9 contact with the guide plate 5, the probe 6 is connected to the guide plate 5, thereby changing the resistance value of the multi-contact resistor 3 connected to the circuit, and then changing the AC frequency output by the signal generator, so that students can intuitively feel the impact of different operations on the magnetic field.

[0032] The signal generator generates alternating current signals of different frequencies by manual triggering and loads them onto the transmitting coil 1 to generate an alternating magnetic field.

[0033] When the transmitting coil assembly generates an alternating magnetic field, the receiving coil assembly generates an induced electromotive force within the alternating magnetic field. The design of the receiving coil 2 utilizes highly sensitive materials and winding techniques, accurately capturing even subtle magnetic field changes and generating a stable induced electromotive force signal, providing a reliable signal source for subsequent audio processing and image conversion.

[0034] The receiving coil assembly is arranged corresponding to the transmitting coil assembly and includes a receiving coil 2. When the transmitting coil assembly generates an alternating magnetic field, the receiving coil assembly generates an induced electromotive force in the alternating magnetic field;

[0035] The audio processing module filters and amplifies the induced electromotive force signal generated by the receiving coil assembly. After amplification, the signal is further analyzed. Using the mathematical algorithm of Fourier transform, the time-domain audio signal is converted to the frequency domain, obtaining the signal's frequency components and amplitude information. This information is then converted into visual elements of an image based on pre-set mapping rules. The audio processing module includes a filtering circuit, an amplifying circuit, a shaping circuit, and a conversion circuit. The filtering circuit utilizes a specific circuit structure constructed with electronic components. Based on the different impedance characteristics presented by signals of different frequencies in the circuit, it filters the signal and removes high-frequency noise and low-frequency interference. The amplifying circuit, based on an operational amplifier, effectively removes noise and interference, ensuring signal purity. The input induced electromotive force signal is amplified to an amplitude sufficient to drive the speaker, employing multi-stage amplification technology to ensure the stability and reliability of the amplification effect. The shaping circuit modulates the amplified signal to better meet audio signal requirements, for example, transforming an irregular waveform into a common audio waveform such as a sine wave or square wave. The conversion circuit is used to convert the shaped and modulated signal into an image signal. Through the mathematical algorithm of Fourier transform, the time domain audio signal is converted into the frequency domain, the frequency component and amplitude information of the signal are obtained, and according to the preset mapping rules, these frequency and amplitude information are converted into the visual elements of the image, such as mapping low-frequency signals to darker colors or larger shapes, and mapping high-frequency signals to brighter colors or smaller shapes.

[0036] The induced electromotive force signal generated by the receiving coil often contains various noise and unwanted frequency components. The filter in the audio processing module uses electronic components such as capacitors, inductors, and resistors to form a specific circuit structure. It filters the signal based on the different impedance characteristics presented by different frequency signals in the circuit. For example, a low-pass filter allows low-frequency signals to pass while attenuating high-frequency signals; a high-pass filter does the opposite, allowing high-frequency signals to pass while attenuating low-frequency signals. A bandpass filter only allows signals within a specific frequency range to pass, significantly attenuating other frequency signals. Through filtering, high-frequency noise, such as high-frequency clutter generated by electromagnetic interference from surrounding electronic devices, and low-frequency interference, such as low-frequency ripple from the power supply, are removed from the signal, ensuring the purity of the signal for subsequent processing and laying the foundation for accurate music signal generation.

[0037] The induced electromotive force signal is typically too weak to directly drive a speaker. The amplifier in the audio processing module, based on electronic devices such as transistors or operational amplifiers, utilizes their current or voltage amplification properties to amplify the input induced electromotive force signal. For example, a common-emitter amplifier circuit uses the appropriate setting of transistor component parameters, such as the bias resistor, to cause the input signal to generate a varying current between the base and emitter of the transistor. This amplification effect of the transistor outputs the amplified current signal at the collector, which is then converted to an amplified voltage signal via a load resistor. This amplifies the weak induced electromotive force signal to a sufficient amplitude to drive the speaker, enabling the speaker to produce clear, loud sound.

[0038] The amplified signal is shaped to better match the waveform of the audio signal. For example, the irregular waveform of the induced electromotive force signal can be shaped into a waveform closer to common audio waveforms such as a sine wave or square wave. Modulation processing may also be performed, such as adjusting the signal's amplitude or frequency according to a specific pattern to achieve different musical effects. For example, frequency modulation can be used to precisely adjust the frequency of the induced electromotive force signal to the required frequency of musical notes. This optimizes the signal's quality and characteristics so that it accurately corresponds to different musical notes and melodies, enhancing the expressiveness and accuracy of the music.

[0039] The speakers are driven by the amplified signal and emit sounds corresponding to the signal. The speakers use high-fidelity audio technology to accurately restore the details and timbre of the audio signal, providing students with a high-quality listening experience and allowing them to clearly hear the changes in music caused by different operations;

[0040] The visualization module is used to receive visual element signals and display them in the form of images. The visualization module uses a high-resolution display screen and a fast image processing chip, which can display images converted from audio signals in real time and smoothly, allowing students to intuitively see how changes in audio signals are converted into changes in visual images, and enhance their understanding of the relationship between electromagnetic induction and music.

[0041] After completing the aforementioned processing of the induced electromotive force signal, the audio processing module further analyzes the signal. Using mathematical algorithms such as the Fourier transform, the time-domain audio signal is converted to the frequency domain, obtaining the signal's frequency components and amplitude information. Then, based on preset mapping rules, this frequency and amplitude information is converted into visual elements of the image, such as color, brightness, and shape. For example, low-frequency signals can be mapped to darker colors or larger shapes, while high-frequency signals can be mapped to brighter colors or smaller shapes. By converting audio signal features at different moments into corresponding visual elements and arranging them in chronological order, a dynamic visual image can be generated. This visual presentation provides students with another intuitive way to understand the relationship between music and electromagnetic induction. Students can simultaneously observe the changes in the audio signal over time and the corresponding changes in the visual image, gaining a deeper understanding of the inherent connection between the rhythm and melody of music and its signal characteristics, enhancing teaching effectiveness and the student learning experience.

[0042] Among them, the Fourier transform algorithm uses discrete Fourier transform (DFT):

[0043] Audio signals are essentially continuous analog signals that vary over time, but for digital processing, they need to be discretely sampled. Assume the audio signal sampling sequence we obtain is x[n], (n = 0, 1, 2, \cdots, N-1), where N is the number of sampling points. The discrete Fourier transform converts this discrete signal in the time domain into a discrete signal in the frequency domain, X[k]. The calculation formula is:

[0044] X[k]=\sum_{n=0}^{N-1}x[n]e^{-j\frac{2\pi}{N}kn}

[0045] Here, (k = 0, 1, 2, \cdots, N-1), (j) is an imaginary unit. Using this formula, we can calculate the frequency domain component X[k] corresponding to each frequency point (k), which contains the amplitude and phase information of that frequency point. For example, when k = 0, X[0] represents the DC component of the signal; when k takes different non-zero values, it corresponds to AC components of different frequencies.

[0046] The discrete Fourier transform (DFT) is computationally intensive, and for longer signal sequences, the calculation time can be very long. The Fast Fourier Transform (FFT) is an efficient algorithm for computing the DFT. By cleverly exploiting the symmetry and periodicity of rotation factors, it reduces the computational complexity from O(N^2) to O(NlogN). In practical applications, audio processing modules often employ the Fast Fourier Transform (FFT) algorithm to improve computational efficiency. For example, for an audio signal consisting of 1024 samples, the FFT algorithm can complete the frequency domain conversion in a very short time, significantly improving the real-time performance of signal processing.

[0047] Mapping rule formulation algorithm:

[0048] Frequency color mapping divides the audio signal into multiple frequency bands according to its frequency range. For example, for the 20Hz-20kHz frequency range audible to the human ear, it can be divided into 100 frequency bands. Then, a specific color is assigned to each frequency band. A hue-based mapping method can be used, such as gradually transitioning from red (low frequency) to purple (high frequency). The specific mapping formula can be determined based on the color space model (such as the HSV color space). Assuming that we linearly map the frequency range to the hue value range [0,360) of the HSV color space, the hue value h corresponding to the frequency f can be calculated by the following formula:

[0049] h=\frac{f-f_{min}}{f_{max}-f_{min}}\times 360

[0050] Here, f_{min} is the lowest frequency of 20Hz, and f_{max} is the highest frequency of 20kHz. In this way, audio signals of different frequencies are mapped to different colors, with low-frequency signals corresponding to red and high-frequency signals corresponding to blue-purple.

[0051] Amplitude-brightness mapping: The amplitude of an audio signal reflects the strength of the sound. To map the amplitude information to the brightness of the image, the amplitude of the audio signal can be normalized to a range between [0, 1]. Then, the normalized amplitude value is directly mapped to the brightness value of the image. For example, in an 8-bit grayscale image, the brightness value range is [0, 255]. The brightness value l corresponding to the amplitude value a can be calculated using the following formula:

[0052] l = a times 255

[0053] In this way, the image area corresponding to the audio signal with a larger amplitude has a higher brightness, and the image area corresponding to the audio signal with a smaller amplitude has a lower brightness.

[0054] Dynamic image generation algorithm:

[0055] Time series processing: Audio signals change over time. To generate dynamic visual images, the audio signal needs to be segmented and processed chronologically. For example, the audio signal can be divided into 100-millisecond segments. For each audio segment, a Fourier transform is first performed to obtain its frequency domain information. This information is then converted into visual elements according to mapping rules.

[0056] Image updating and display arranges the visual elements corresponding to each audio signal in chronological order, forming frames of images. Video encoding can be used to combine these image frames into a video stream and play it in real time on the display. For example, playing at a frame rate of 30 frames per second allows students to see continuous dynamic visual images, intuitively experiencing the changes in the audio signal over time and its corresponding relationship with the music. During the image update process, double buffering technology can be used, creating two image buffers: one for the current display and the other for generating and processing the next frame. When the new frame is generated, the buffers are quickly switched to avoid image flickering and lag, ensuring the smooth display of dynamic images.

[0057] Example 2:

[0058] Please see the attached Figure 4 Based on the above embodiment, this embodiment provides an arrangement scheme of the transmitting coil 1 and the receiving coil 2:

[0059] There are multiple transmitting coils 1 and receiving coils 2, which are arranged in a matrix, forming a rectangular grid, and are evenly spaced in the horizontal and vertical directions.

[0060] This arrangement makes the sensing area more uniform, and the setting of multiple transmitting coils 1 and receiving coils 2 causes mutual interference between them, increasing the diversity and complexity of the signal, and can produce richer musical effects and visual image changes.

[0061] Example 3:

[0062] Please see the attached Figure 5 Based on the first embodiment, this embodiment provides another arrangement of the transmitting coil 1 and the receiving coil 2:

[0063] There are multiple transmitting coils 1 and receiving coils 2, which are arranged in concentric circles. With the center point as the reference, the number of induction coils increases gradually from the inside to the outside or remains unchanged.

[0064] For example, the innermost layer consists of one coil, the second layer has three coils, the third layer has five coils, and so on. This arrangement creates a radial distribution of the induction area centered on the center of the circle. This arrangement creates another pattern of mutual interference between the multiple transmitting coils 1 and receiving coils 2, resulting in varying degrees of induced electromotive force, thus providing a richer dimension of variation for music generation.

[0065] Example 4:

[0066] Please see the attached Figure 6Based on the first embodiment, this embodiment provides another arrangement of the transmitting coil 1 and the receiving coil 2:

[0067] There are multiple transmitting coils 1 and receiving coils 2, which are arranged in a staggered manner, with coils in adjacent rows on a plane being staggered by half a coil spacing.

[0068] For example, on a plane, some coils are first arranged in a row with a fixed spacing. Then, in adjacent rows, the induction coils are staggered by half the coil spacing. This arrangement increases mutual induction and interference between the coils, but also produces more complex and diverse induced EMF signal combinations. Because the influence on coils in different positions is asynchronous and irregular, the generated induced EMF signals are richer and more varied. This provides more innovative possibilities for students or professionals pursuing unique musical effects and can create unique musical styles.

[0069] Embodiment 5:

[0070] Please see the attached Figure 7 Based on the first embodiment, this embodiment provides another arrangement of the transmitting coil 1 and the receiving coil 2:

[0071] There are multiple transmitting coils 1 and receiving coils 2, which are arranged in layers. Multiple layers are provided in a three-dimensional space, and each layer is provided with an adjustment device for adjusting the distance between the layers.

[0072] For example, three layers of coils can be arranged, with a certain vertical distance between each layer. The induction coils in each layer can be arranged in a matrix, concentric circles, or staggered pattern as described above. This arrangement is more complex and disordered than other embodiments, and coils in different layers are affected differently, resulting in layered changes in induced electromotive force. This layered arrangement can simulate the stereo effect of music, making the generated music more spatially rich.

[0073] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A music interactive display teaching device, characterized in that: include: A transmitting coil assembly, comprising a signal generator and a transmitting coil (1), wherein the signal generator generates alternating current signals of different frequencies by manual triggering and loads the signals onto the transmitting coil (1), thereby generating an alternating magnetic field; A receiving coil assembly is provided corresponding to the transmitting coil assembly and comprises a receiving coil (2). When the transmitting coil assembly generates an alternating magnetic field, the receiving coil assembly generates an induced electromotive force in the alternating magnetic field; An audio processing module, which is used to filter and amplify the induced electromotive force signal generated by the receiving coil assembly, further analyze the signal after amplification, convert the time-domain audio signal into the frequency domain through the mathematical algorithm of Fourier transform, obtain the frequency components and amplitude information of the signal, and convert this frequency and amplitude information into visual elements of the image according to preset mapping rules; A speaker is driven by the amplified signal and emits a sound corresponding to the signal; The visualization module is used to receive visual element signals and display them in the form of images.

2. The music interactive display teaching device according to claim 1, characterized in that: The signal generator comprises a multi-contact resistor (3), one contact of the multi-contact resistor (3) is connected to a pin of the transmitting coil (1), and a corresponding manual trigger device is provided above the remaining contacts, the manual trigger device is connected to an electrode of a power supply (4), and the other electrode of the power supply (4) is connected to the other pin of the transmitting coil (1).

3. The music interactive display teaching device according to claim 2, characterized in that: The manual trigger device comprises a guide plate (5), the guide plate (5) is connected to an electrode of a power source (4), a plurality of probes (6) are passed through and slidably connected on the plate body of the guide plate (5), the plurality of probes (6) correspond one to one with the remaining contacts of the multi-contact resistor (3), the top of the probe (6) is fixedly connected to a button (7), the outer wall of the probe (6) is provided with a spring (8), one end of the spring (8) is fixedly connected to the upper surface of the guide plate (5), and the other end is fixedly connected to the lower wall of the button (7), the lower wall of the button (7) is also fixedly connected to a contact piece (9), the contact piece (9) is connected to the probe (6), and when the button (7) is pressed down to make the contact piece (9) contact with the guide plate (5), the probe (6) and the guide plate (5) are connected.

4. The music interactive display teaching device according to claim 1, characterized in that: The audio processing module includes a filtering circuit, an amplifying circuit, a shaping circuit and a conversion circuit. The filtering circuit uses electronic components to form a specific circuit structure, and based on the different impedance characteristics presented by different frequency signals in the circuit, it filters the signal and removes high-frequency noise and low-frequency interference in the signal. The amplifying circuit is based on an operational amplifier and amplifies the input induced electromotive force signal to an amplitude sufficient to drive the speaker. The shaping circuit shapes and modulates the amplified signal so that its waveform better meets the requirements of the audio signal. The conversion circuit is used to convert the shaped and modulated signal into an image signal.

5. The music interactive display teaching device according to claim 1, characterized in that: The transmitting coils (1) and receiving coils (2) are multiple in number and are arranged in a matrix form in a rectangular grid shape and are distributed at equal intervals in the horizontal and vertical directions.

6. The music interactive display teaching device according to claim 1, characterized in that: The transmitting coils (1) and receiving coils (2) are multiple in number and are arranged in concentric circles. With the center point as a reference, the number of induction coils increases gradually from the inside to the outside or remains unchanged.

7. The music interactive teaching device according to claim 1, characterized in that: There are multiple transmitting coils (1) and receiving coils (2), which are arranged in a staggered manner, with coils in adjacent rows on a plane being staggered by half a coil spacing.

8. The music interactive display teaching device according to claim 1, characterized in that: The transmitting coil (1) and the receiving coil (2) are multiple in number and arranged in a layered manner, with multiple layers arranged in a three-dimensional space, and each layer is provided with an adjustment device for adjusting the spacing between the layers.

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