Multi-mode pickup adaptive Guqin sound amplification base and acoustic optimization system thereof

Abstract

The invention discloses a multi-mode pickup adaptive Guqin sound amplification base and an acoustic optimization system thereof, and relates to the technical field of national musical instrument acoustic enhancement. The sound amplification base comprises a telescopic bearing surface, a multi-mode sensor array and a frequency division loudspeaker group, vibration and air sound wave signals of a musical instrument body are synchronously collected through a vibration sensor (32-channel MEMS array) and an air sound wave pickup (heart-shaped microphone array), fusion processing is carried out through a self-adaptive sound field optimization engine, and the sound amplification base is dynamically matched with preset modes such as halls, stages and dry sound. The upper and lower layered acoustic cavity design is innovatively adopted, and high-fidelity restoration and scene adaptation of the tone of the Guqin are realized. The system supports the folding support to be transformed into a guqin table mode, integrates touch interaction and LED light guide feedback, is compatible with guqin and national musical instruments of different standards, is suitable for professional performance, teaching recording and cultural heritage digital scenes, and solves the problems of tone distortion, environmental interference and poor adaptability of traditional sound amplification equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic enhancement of folk musical instruments, and in particular to an intelligent sound amplification base specially designed for guqin. By integrating vibration sensing and air acoustic pickup technology, combining a deformable structure and an adaptive sound field algorithm, high-fidelity restoration of the original sound of the guqin and customized adaptation of the acoustic scene are achieved. Background Art

[0002] The traditional guqin sound amplification solution has the following pain points: single sound pickup method: relying solely on contact piezoelectric sensors can easily lose the resonance details of the instrument body, or using only a microphone can easily introduce environmental noise; poor adaptability: the fixed structure is not compatible with the sizes and paint materials of different guqins (such as the Zhongni style is 118cm long and the Fuxi style is 128cm long); acoustic interference: when placed directly on an ordinary piano table, the resonance of the desktop causes low-frequency turbidity. Summary of the invention

[0003] The present invention provides a deformable, multi-modal sound pickup intelligent sound amplification base, which solves the problems of timbre distortion, environmental interference and equipment portability in guqin sound amplification through structural innovation and algorithm integration, and realizes high-precision control of the performance sound field.

[0004] The core structural design includes an adaptive load-bearing platform, a double-layer acoustic cavity, and a deformable support system.

[0005] Adaptive load-bearing platform: The main body of the base is made of aviation aluminum frame + shock-absorbing silicone cushion layer, and the width of the top supporting surface is adjustable (100-140cm infinitely retractable), which is suitable for guqins of different standards; paint compatible design: The contact area uses electrostatic adsorption silicone pad (non-sticky) with a surface resistivity of 10^6-10^8Ω·m to avoid damaging the guqin paint surface.

[0006] Double-layer acoustic cavity: Upper pickup cavity: embedded with multi-modal sensor array, including: Vibration sensor group: 32 MEMS accelerometers arranged in matrix, covering the key vibration points of Yueshan, Longyin and Yanzu; Acoustic pickup: 4 cardioid directional condenser microphones, arranged in a diamond array 10-15cm directly below the piano body. Lower sound reinforcement cavity: installed with 2 3-inch mid-high frequency units + 1 6.5-inch long-stroke low-frequency unit, the box height is ≥25cm, to ensure that the sound axis is flush with the player's ear position.

[0007] The deformable support system is designed with a folding piano table mode and desktop resonance suppression. Folding piano table mode: After the bottom bracket is unfolded, an H-shaped support structure is formed. The bracket legs have built-in damping hinges, and the unfolding angle is adjustable from 0 to 90 degrees. Desktop resonance suppression: The bracket contact surface is filled with acoustic foam, and the base is fixed with magnetic suction + buckle to reduce structural conduction noise. When the base is switched to piano table mode, the bracket unfolds and raises the overall height to 75cm. The mid-high frequency unit automatically adjusts its direction through the built-in pitch angle adjustment mechanism (±10°) to ensure that the sound axis always points to the audience area.

[0008] The acoustic signal processing system includes multimodal signal fusion and adaptive sound field optimization engine. The vibration signal path in multimodal signal fusion: accelerometer → charge amplifier → 24bit ADC → FPGA time domain alignment → weighted superposition with sound wave signal; sound wave signal path: microphone → low-noise preamplifier → 48kHz sampling → FIR filter to eliminate environmental noise (such as 50Hz power supply interference). Adaptive sound field optimization engine: The mode preset library includes three modes, namely traditional hall mode: enhance the 500Hz-2kHz frequency band to simulate the reverberation of wooden structure buildings; stage penetration mode: enhance the 3-5kHz overtone area, cooperate with dynamic compression to avoid howling; studio dry sound mode: enable adaptive threshold, suppress reverberation and retain fingering details. And it can perform intelligent scene recognition: automatically match the sound field parameters through vibration signal spectrum analysis (such as dense string blowing in "Guangling San" vs scattered sound in "Pingsha Luoyan"); environmental noise monitoring: dual-microphone beamforming technology separates the target sound source and interference in real time.

[0009] The human-computer interaction system includes a hardware interaction interface and a wireless control ecosystem. Hardware interaction interface: Hidden OLED touch screen: stored in the side rail of the base, displaying the spectrum, mode and connection status; physical encoder: the knob adjusts the master volume / reverberation intensity with tactile feedback; array LED light guide: distributed along the edge of the base, indicating the pickup sensitivity by color / brightness (green→yellow→red). Wireless control ecosystem: supports Bluetooth 5.3 and Wi-Fi 6 dual-mode transmission, and can preset custom sound fields through the APP (such as "Gong Yi's playing style EQ"); supports voice command wake-up (need to say the Guqin Jianzipu terminology, such as "activate the 'lock bell' mode" to prevent false triggering).

[0010] Industrial design includes modular color scheme and portability optimization. Modular color scheme: The base shell adopts magnetically replaceable panels, providing 6 styles including black piano lacquer / cinnabar red lacquer texture / imitation cracked blue-gray; Portability optimization: The folded size is ≤1200×400×150mm, the total weight is ≤15kg, and the handle is integrated into the bracket hinge.

[0011] This invention has achieved innovation in sound pickup technology. It is the first MEMS matrix + beamforming microphone fusion solution for the vibration characteristics of the guqin, with a frequency response range of 27.5Hz-12kHz (±1.5dB); the guqin support platform has been structurally innovated: the deformable support can achieve the three-state switching of "base-qin table-mobile workstation" to adapt to complex usage scenarios; innovations have been made in algorithms, and the energy envelope analysis algorithm based on the characteristics of the reduced word score has been used to achieve intelligent mapping of playing techniques and sound field parameters. Through the 1 bass + 2 mid-high three-way system and precise directional design, this sound amplification base can achieve high-fidelity restoration of the full frequency range from 27.5Hz (the lowest note of the guqin) to 12kHz while ensuring portability, meeting the diverse needs of professional performance, teaching and recording. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : Schematic diagram of the sound reinforcement base structure. In the figure: 100, Guqin; 110, retractable supporting surface; 200, multimodal sensor array; 210, body vibration sensor; 220, air sound wave pickup; 230, environmental noise monitoring module; 300, acoustic cavity; 310, frequency division speaker group; 320, signal preprocessing circuit; 311, 6.5-inch long-stroke low-frequency unit; 312, bass reflex port; 313, 3-inch mid-high frequency unit; 330, acoustic isolation board; 400, adaptive sound field optimization engine; 410, sound field mode library; 420, real-time environment analysis module; 430, dynamic equalization algorithm; 500, foldable bracket; 510, bracket leg; 520, damping hinge; 600, touch interaction module; 610, LED light guide ring; 700, Guqin timbre feature library

[0013] Figure 2 :Multi-modal signal fusion flow chart. Demonstrates the logic of synchronous processing of vibration and sound wave signals

[0014] Figure 3 :Adaptive sound field optimization algorithm architecture diagram, including pattern library and real-time analysis module DETAILED DESCRIPTION

[0015] Embodiment 1: Application scenario of professional stage: Place the guqin 100 on the retractable supporting surface 110, and adjust the retractable support surface to align with the edge of the guqin body; unfold the foldable bracket 500 to 75° to form a guqin table, triggering the "stage penetration mode"; when playing, the guqin body vibration sensor 210 captures the changes in the tension of the notes, the air sound wave pickup 220 records the details of the friction of the silk strings, and the DSP enhances the 4kHz overtones in real time; the LED light guide ring 610 breathes dynamically with the volume to avoid misoperation under stage light pollution.

[0016] Example 2: Guqin teaching scenario. The folding base is in pure stand mode and is placed on a traditional guqin table; select "dry sound mode" and enable fingering error detection (based on vibration signal timing analysis) in the APP; when students play, the OLED screen displays the pressure curve of the frets to assist in correcting gestures.

Claims

1. A multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system, characterized in that: include: The retractable support surface (110) is suitable for different sizes of guqin (100), and the surface is covered with an electrostatically adsorbed silica gel layer (resistivity 10 6 -10 8 Ω·m); a multi-modal sensor array (200), comprising a piano body vibration sensor (210), an air sound wave pickup (220) and an environmental noise monitoring module (230); an acoustic cavity (300), which is divided into an upper and lower layer, the lower layer being equipped with a frequency division speaker group (310), and the upper layer being integrated with a signal preprocessing circuit (320); and an adaptive sound field optimization engine (400), which presets a sound field mode based on a vibration spectrum and an acoustic scene matching.

2. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: In the multimodal sensor array (200): the vibration sensor (210) is a 32-channel MEMS accelerometer, arranged according to the guqin acoustic node matrix, covering the Yueshan, Longyin and Yanzu areas; The air sound wave pickup (220) is 4 cardioid directional condenser microphones arranged in a diamond array and 10-15 cm away from the piano body.

3. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: The frequency division loudspeaker group (310) comprises: a 6.5-inch long-stroke low-frequency unit (311), which is installed vertically downward and guides the low-frequency diffusion through the inverted hole (312); and two 3-inch mid-high frequency units (313), which are inclined at 15 degrees and point upward toward the ears of the performer, with a radiation angle of 90 degrees × 60 degrees.

4. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: The adaptive sound field optimization engine includes: a sound field mode library with preset hall mode, stage mode, and dry sound mode; a real-time environment analysis module that suppresses noise sources in specific directions through dual-microphone beamforming; and a dynamic equalization algorithm that automatically adjusts the low-frequency gain (±6dB@80Hz) according to the performance intensity.

5. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: An acoustic isolation plate (330) is provided between the upper and lower layers of the acoustic cavity (300), and is made of a composite damping plate (aluminum base + rubber layer), has a thickness of 3 mm, and a sound insulation value of ≥30 dB.

6. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: The foldable bracket (500) is supported to be unfolded into a piano table mode, the bracket leg (510) has a built-in damping hinge, the unfolding angle is adjustable from 0 to 90 degrees, and the contact surface is filled with acoustic foam (520).

7. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: The edge of the supporting surface (100) is integrated with a touch interaction module (600), which supports gesture sliding to adjust volume and pressing to switch modes, and the touch area and the LED light guide strip (610) provide linkage feedback.

8. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: Built-in Guqin timbre feature library (700), storing resonance spectrum templates of different eras / systems (such as the thick type of Tang Dynasty and the clear type of Qing Dynasty), and real-time matching and optimization through DSP algorithm.

9. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: The environmental noise monitoring module (230) includes a temperature and humidity sensor and a background noise meter, and the data is used to dynamically adjust the sound field parameters (e.g., reducing the low-frequency gain by 3 dB when the humidity is greater than 70%).

10. The multi-modal sound pickup adaptive guqin sound amplification base and its acoustic optimization system according to claim 1, characterized in that: It is compatible with traditional Chinese instruments such as the guzheng and se, and cross-instrument adaptation is achieved by replacing the sensor layout template and acoustic feature library.

Images