Portable intelligent electronic drum based on fabric flexible sensor

Abstract

The invention discloses a portable intelligent electronic drum based on a fabric flexible sensor. The intelligent electronic drum comprises a layered integrated structure, a drum body, a master control and communication module and a power management module, the layered integrated structure is arranged in the drum body; the layered integrated structure is connected with the master control and communication module and the power management module. According to the novel electronic drum, the textile-grade flexible sensor array and the portable square drum body are deeply fused, low-delay intelligent interaction is supported, and a three-in-one technical breakthrough of flexible sensing, a portable structure and intelligent interaction is achieved.

Description

Technical Field

[0001] This invention relates to the field of electronic percussion instrument technology, and in particular to a portable smart electronic drum based on a flexible fabric sensor. Background Technology

[0002] Existing electronic drums generally suffer from the following technical bottlenecks: First, the rigid structure limits portability. Traditional electronic drums rely on rigid piezoelectric sensor arrays and metal / plastic support structures, resulting in a large drum body (usually thicker than 50mm) and heavy (mostly >2kg), which cannot meet the needs of mobile scenarios such as home practice, outdoor performance, and music teaching. Folding and storage are difficult and take up a lot of space.

[0003] Secondly, there is a fundamental contradiction between sensitivity and shock resistance in sensor performance. Traditional piezoelectric or pressure sensors have low sensitivity (trigger threshold generally >0.1N), making it impossible to accurately capture slight displacement differences of 0.1mm; and their shock resistance is weak (impact strength <200N), easily leading to signal drift and trigger failure after frequent impacts, thus limiting their service life. The industry has long faced the dilemma of "high sensitivity leading to fragility, and high durability leading to rough perception."

[0004] Third, the intelligent interactive experience is poor. Most of the accompanying apps communicate via the standard MIDI protocol, resulting in a response latency of >300ms and a rhythm recognition accuracy of <85%. The content adaptability is poor, with a 30-day user retention rate of only 22.4%. The sound library is fixed and cannot generate personalized sound sources based on the user's striking force and speed characteristics, making it difficult to support efficient learning and diverse performance needs.

[0005] Fourth, electromagnetic interference is a prominent issue. Rigid sensor arrays are susceptible to signal interference from external electromagnetic radiation in complex electromagnetic environments (such as household appliances and stage equipment), leading to timbre distortion, a false trigger rate >15%, and affecting performance continuity.

[0006] Fiber fabric flexible sensor (electronic skin) technology boasts high sensitivity of 0.01N, impact resistance of 500N, seamless fit to irregular structures, and a weight of <50g / m². 2 Its significant advantage is that the sampling frequency can reach 100Hz, but it has not yet been effectively applied to the field of electronic percussion instruments.

[0007] Existing technologies have failed to integrate the advantages of flexible sensing, portable structural design, and intelligent interaction algorithms to form an integrated solution. Summary of the Invention

[0008] In view of the above problems, the present invention is proposed to provide a portable smart electronic drum based on a flexible fabric sensor that overcomes or at least partially solves the above problems.

[0009] According to one aspect of the present invention, a portable smart electronic drum based on a fabric flexible sensor is provided, the smart electronic drum comprising: a layered integrated structure, a drum body, a main control and communication module, and a power management module; The layered integrated structure is disposed within the drum body; The hierarchical integrated structure is connected to the main control and communication module and the power management module, respectively.

[0010] Optionally, the layered integrated structure specifically includes, from top to bottom, an impact layer, a flexible sensing layer, a shielding layer, a support layer, and a bottom layer; The impact layer is made of abrasion-resistant TPU fabric with positioning marks printed on the surface; The flexible sensing layer is a dot matrix fiber fabric flexible pressure sensor array. The shielding layer is a graphene composite electromagnetic shielding film; The support layer is an epoxy resin reinforced honeycomb panel; The bottom layer is an anti-slip silicone pad, which integrates a Type-C charging / data interface.

[0011] Optionally, the drum body is a square ultra-thin drum body with a thickness of ≤30mm, a drum surface area of ​​30cm×30cm, a single-sided frameless design, and supports rolling and folding for storage.

[0012] Optionally, the main control and communication module specifically includes: Sensor interface circuit: 128-channel analog switch matrix + instrumentation amplifier, enabling independent sampling of single-point signals, with a sampling rate ≥10kS / s / channel; Signal conditioning unit: Second-order active filter + programmable gain amplifier; ADC module: 16-bit Σ-Δ analog-to-digital converter, signal-to-noise ratio >96dB; Main control circuit: adopts ARM Cortex-M7 core MCU, with built-in hardware FFT accelerator; Wireless communication module: Bluetooth 5.3 + Wi-Fi 6, dual-mode concurrency ensures reliability.

[0013] Optionally, the power management module specifically includes: a 5V / 2A lithium battery power supply, a battery life of >8 hours, and support for Type-CPD fast charging.

[0014] Optionally, the pressure sensor adopts a piezoresistive-piezoelectric dual-mode sensing mechanism. The piezoresistive mode senses the static pressure distribution, while the piezoelectric mode captures high-frequency impact dynamic signals. The dual-mode data is fused and then output.

[0015] Optionally, the flexible sensing layer, which is a dot matrix fiber fabric flexible pressure sensor array, specifically includes: The 32×32 dot matrix pressure sensor array, woven from fiber fabric, has a single-point trigger threshold of ≤0.01N, an impact resistance of ≥500N, and a thickness of ≤0.8mm. The conductive fibers and pressure-sensitive fibers are integrated into the fabric substrate through digital weaving technology.

[0016] This invention provides a portable intelligent electronic drum based on a flexible fabric sensor. The intelligent electronic drum includes: a layered integrated structure, a drum body, a main control and communication module, and a power management module. The layered integrated structure is disposed within the drum body. The layered integrated structure is connected to both the main control and communication module and the power management module. This invention provides a novel electronic drum that deeply integrates a textile-grade flexible sensor array with a portable square drum body, supporting low-latency intelligent interaction, achieving a technological breakthrough in the "flexible sensing-portable structure-intelligent interaction" trinity.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An exploded view of the overall structure of the electronic drum provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the fabric sensor weaving structure provided in an embodiment of the present invention; Figure 3 The circuit block diagram provided for the embodiments of the present invention. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0021] The terms "comprising" and "having," and any variations thereof, in the specification, embodiments, claims, and drawings of this invention are intended to cover non-exclusive inclusion, such as including a series of steps or units.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] This invention provides a portable smart electronic drum based on a flexible fabric sensor, specifically comprising: 1. Drum body structure Design features: a square, ultra-thin drum body with a thickness of ≤30mm and a drum surface area of ​​30cm×30cm. It has a single-sided frameless design and supports rolling and folding for storage.

[0024] Layered integration structure (from top to bottom): Impact layer: 0.5mm abrasion-resistant TPU fabric with printed positioning marks on the surface; Sensing layer: 32×32 dot matrix fiber fabric flexible pressure sensor array, which integrates conductive fibers and pressure-sensitive fibers into a 0.8mm fabric substrate through digital weaving technology, with an effective area of ​​5mm×5mm per point and a center-to-center distance of 9.375mm between adjacent sensing units; Shielding layer: 0.1mm graphene composite electromagnetic shielding film, suppressing external interference of more than 40dB; Support layer: 2mm epoxy resin reinforced honeycomb panel, providing rigid support while keeping the overall weight ≤500g; Bottom layer: Anti-slip silicone pad, integrating Type-C charging / data interface.

[0025] Sensor type: It adopts a piezoresistive-piezoelectric dual-mode sensing mechanism. The piezoresistive mode senses the static pressure distribution (0.01N-10N), and the piezoelectric mode captures high-frequency impact dynamic signals (frequency response range 10Hz-10kHz). The dual-mode data is fused and output.

[0026] 2. Sensing and Control Module Hardware architecture: Power module: Powered by a 5V / 2A lithium battery, providing over 8 hours of battery life, and supports Type-C PD fast charging; Sensor interface circuit: 128-channel analog switch matrix + instrumentation amplifier (input impedance > 10GΩ), realizing independent sampling of single-point signals, with a sampling rate ≥ 10kS / s / channel; Signal conditioning unit: Second-order active filter (cutoff frequency 5kHz) + programmable gain amplifier (PGA, gain range 1-128 times). ADC module: 16-bit Σ-Δ analog-to-digital converter, signal-to-noise ratio >96dB; Main control circuit: adopts ARM Cortex-M7 core MCU (480MHz main frequency), with built-in hardware FFT accelerator; Wireless communication module: Bluetooth 5.3 (supports LC3 encoding, latency <35ms) + Wi-Fi 6 (backup mode), dual-mode concurrency ensures reliability; Electromagnetic shielding structure: The sensor interface circuit adopts a metal shielding cover + TVS tube array, which meets the IEC 61000-4-3 standard (10V / m radiation immunity test).

[0027] 3. Intelligent Interaction System Low-latency communication protocol: Custom "force-position-time" three-dimensional data packets (force value 0-1023, position coordinates X / Y each 8 bits, timestamp 16 bits), data packet size is fixed at 8 bytes, average latency ≤35ms in Bluetooth 5.3 mode, ≤25ms in Wi-Fi mode, which is better than the industry level of >300ms of existing MIDI protocols.

[0028] Mobile App Core Algorithm: Rhythm recognition engine: Based on LSTM neural network, it performs time sequence analysis on the striking sequence, with a recognition accuracy of ≥98%; Velocity-Timbre Mapping Model: Support Vector Regression (SVR) is used to establish a nonlinear mapping between the user's striking velocity feature vector and timbre parameters to generate personalized sound sources; Anti-interference digital filtering: The Kalman filter fuses spatial correlation data from a 32×32 array, eliminates abnormal transition points, and has a false trigger rate of <2%; Adaptive music library system: Built-in 200+ styles of sheet music, dynamically adjusts the difficulty according to the user's playing level, and increases the 30-day retention rate to 67%.

[0029] 4. Integrated Approach Interlayer bonding process: The sensing layer and the impact layer are vacuum-pressed together using 3M VHB double-sided adhesive to eliminate air gaps and improve the consistency of force transmission; Sensor calibration mode: Automatically performs "zero-point self-learning + multi-point pressure mapping" calibration upon power-on to compensate for individual differences in fabric sensors; Modular design: The sensing layer, main control board, and battery module are independently packaged, and any damaged module can be replaced, extending the service life of the whole machine.

[0030] Comparison Table of Key Technical Indicators and Beneficial Effects like Figure 1 The image shows an exploded view of the overall structure of the electronic drum.

[0031] Impact layer (TPU fabric); Sensing layer (32×32 fabric sensor array); Shielding layer; Support layer; Bottom layer; Main control box (integrated wireless module and battery); Type-C interface.

[0032] Figure 2 : Schematic diagram of the fabric sensor weave structure.

[0033] Warp-directed conductive fiber (silver-plated fiber); weft-directed pressure-sensitive fiber (silver-plated fiber); warp-weft intersecting sensing node; semiconductor centralized procurement fabric (black fabric).

[0034] Figure 3 Circuit block diagram.

[0035] Power management module → Sensor matrix → Multiplexer → Instrumentation amplifier → ADC → MCU → Bluetooth / Wi-Fi module → Mobile APP; MCU → Audio DAC → Speaker (optional).

[0036] Example 1: Basic Portable Electronic Drum Drum body dimensions: 300mm×300mm×25~30mm, weight 480g. The sensing layer uses a 32×32 array with a spacing of 9.375mm between adjacent nodes. The main control chip is an STM32H743, and the wireless module is a Nordic nRF5340 (Bluetooth 5.3). The battery capacity is 4000mAh, providing approximately 10 hours of battery life. The app allows users to select between "Practice Mode" (with position prompts) and "Performance Mode" (low latency).

[0037] Example 2: Professional-grade high-sampling version The ADC has been upgraded to 24-bit, with a sampling rate increased to 20kS / s / channel, supporting the capture of drumstick roll techniques (>15 hits / second). The MCU has been upgraded to i.MX RT1060, supporting edge AI computing for offline rhythm recognition. The wireless module adds a 2.4G proprietary protocol, reducing latency to 15ms.

[0038] Example 3: Scalable splicing scheme Four standard drum bodies are spliced ​​together using magnetic and spring pin interfaces to form a large 60cm×60cm drum array. Each module is independently addressed, and the main module uniformly distributes clock synchronization signals to enable multi-person collaborative performances or complex rhythm practice.

[0039] A portable smart electronic drum, comprising: Flexible sensing layer: a 32×32 dot matrix pressure sensor array woven from fiber fabric, with a single-point trigger threshold ≤0.01N, impact resistance ≥500N, and thickness ≤0.8mm. Conductive fibers and pressure-sensitive fibers are integrated into the fabric substrate through digital weaving technology. Ultra-thin drum body: square structure, thickness ≤30mm, weight ≤500g, frameless on one side, supports rolling and folding; Main control and communication module: integrated on the edge of the drum body, with built-in ARM Cortex-M series MCU, Bluetooth 5.3 and above communication module, supports custom "force-position-time" data packet format, and latency ≤50ms; Electromagnetic shielding structure: A graphene shielding film is set between the sensing layer and the main control circuit, so that the overall electromagnetic radiation resistance reaches the 10V / m level of the IEC 61000-4-3 standard.

[0040] A dual-modal pressure detection method for electronic drums: Simultaneously, the DC component of the piezoresistive mode and the AC component of the piezoelectric mode are collected. Temperature compensation and spatial interpolation are performed on the piezoresistive signal to obtain the static pressure distribution; Charge amplification and envelope detection of piezoelectric signals are performed to obtain dynamic impact characteristics; The dual-mode data is fused using Kalman filtering to output the final trigger signal and force value.

[0041] An intelligent interactive system between an electronic drum and a mobile terminal: It adopts the Bluetooth 5.3 protocol stack, disables the retransmission mechanism, and uses LC3 encoding; The data packet has a fixed 8-byte structure, including the force value (10 bits), X / Y coordinates (8 bits each), timestamp (16 bits), and check bit; The LSTM rhythm recognition model on the APP uses a sliding window approach to process the data stream, achieving a recognition accuracy of ≥98%. The velocity-timbre mapping uses a user-feature-adaptive SVR model to achieve personalized sound source output.

[0042] Beneficial effects: This invention overcomes the core pain points of existing technologies, such as poor portability of rigid structures, contradiction between sensor sensitivity and durability, high interaction latency, and sensitivity to electromagnetic interference. It provides a novel electronic drum that deeply integrates a textile-grade flexible sensor array with a portable square drum body and supports low-latency intelligent interaction, achieving a technological breakthrough in the "flexible sensing-portable structure-intelligent interaction" trinity.

[0043] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A portable intelligent electronic drum based on a flexible fabric sensor, characterized in that, The intelligent electronic drum includes: a layered integrated structure, a drum body, a main control and communication module, and a power management module; The layered integrated structure is disposed within the drum body; The hierarchical integrated structure is connected to the main control and communication module and the power management module, respectively.

2. The portable intelligent electronic drum based on a flexible fabric sensor according to claim 1, characterized in that, The layered integrated structure specifically includes, from top to bottom, an impact layer, a flexible sensing layer, a shielding layer, a support layer, and a bottom layer; The impact layer is made of abrasion-resistant TPU fabric with positioning marks printed on the surface; The flexible sensing layer is a dot matrix fiber fabric flexible pressure sensor array. The shielding layer is a graphene composite electromagnetic shielding film; The support layer is an epoxy resin reinforced honeycomb panel; The bottom layer is an anti-slip silicone pad, which integrates a Type-C charging / data interface.

3. A portable intelligent electronic drum based on a flexible fabric sensor according to claim 1, characterized in that, The drum body is a square ultra-thin drum body with a thickness of ≤30mm and a drum surface area of ​​30cm×30cm. It features a single-sided frameless design and supports rolling and folding for storage.

4. A portable intelligent electronic drum based on a flexible fabric sensor according to claim 1, characterized in that, The main control and communication module specifically includes: Sensor interface circuit: 128-channel analog switch matrix + instrumentation amplifier, enabling independent sampling of single-point signals, with a sampling rate ≥10kS / s / channel; Signal conditioning unit: Second-order active filter + programmable gain amplifier; ADC module: 16-bit Σ-Δ analog-to-digital converter, signal-to-noise ratio >96dB; Main control circuit: adopts ARM Cortex-M7 core MCU, with built-in hardware FFT accelerator; Wireless communication module: Bluetooth 5.3 + Wi-Fi 6, dual-mode concurrency ensures reliability.

5. A portable intelligent electronic drum based on a flexible fabric sensor according to claim 1, characterized in that, The power management module specifically includes: a 5V / 2A lithium battery power supply, a battery life of >8 hours, and support for Type-C PD fast charging.

6. A portable intelligent electronic drum based on a flexible fabric sensor according to claim 1, characterized in that, The pressure sensor employs a piezoresistive-piezoelectric dual-mode sensing mechanism. The piezoresistive mode senses the static pressure distribution, while the piezoelectric mode captures high-frequency impact dynamic signals. The dual-mode data is then fused and output.

7. A portable intelligent electronic drum based on a flexible fabric sensor according to claim 2, characterized in that, The flexible sensing layer is a dot matrix fiber fabric flexible pressure sensor array, specifically comprising: The 32×32 dot matrix pressure sensor array, woven from fiber fabric, has a single-point trigger threshold of ≤0.01N, an impact resistance of ≥500N, and a thickness of ≤0.8mm. The conductive fibers and pressure-sensitive fibers are integrated into the fabric substrate through digital weaving technology.

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