Voiceprint acquisition device based on linear array
By using a linear array-based acoustic signature acquisition device, employing electret microphone arrays and digital-analog isolation technology, the synchronization and anti-interference problems of traditional acoustic signature acquisition systems are solved, achieving high-precision multi-channel acoustic signal acquisition and processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional voiceprint acquisition systems suffer from poor multi-channel signal synchronization and insufficient anti-interference capabilities. Furthermore, analog and digital circuits are susceptible to electrical interference, leading to signal distortion and increased noise, which exacerbates the acquisition difficulty, especially in complex environments.
The device employs a linear array-based voiceprint acquisition system, which uses a linear array consisting of four electret microphones, equipped with an independent in-phase amplifier and filtering circuit. It achieves synchronous signal acquisition through a high-speed multi-channel analog-to-digital converter chip and uses digital-to-analog isolation technology to provide independent power supplies for analog and digital circuits.
It achieves high-quality synchronous acquisition of multi-channel acoustic signals, improves signal acquisition accuracy and spatial resolution, reduces power supply interference, and enhances system stability and signal purity.
Smart Images
Figure CN224054418U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of acoustic signal collection, specifically relates to a multichannel voiceprint collection device based on linear array, is applicable to high accuracy, high synchronous voiceprint signal acquisition and processing, is widely used in equipment fault detection, abnormal acoustic wave monitoring and voiceprint identification etc. BACKGROUND
[0002] With the rapid development of intelligent monitoring and speech recognition technology, voiceprint collection device is increasingly widely used in the fields of equipment state monitoring, security authentication, environmental sound analysis and man-machine interaction. The traditional voiceprint collection system usually adopts single microphone or simple microphone array, and has defects such as limited number of collection channels, difficult signal synchronization and insufficient anti-interference ability, which is difficult to meet the demand of multichannel high-precision synchronous collection. At the same time, since the analog circuit and the digital circuit share the power supply, electrical interference is easy to produce, which leads to signal distortion and noise increase, affecting the subsequent signal processing and recognition effect. Especially in complex industrial or security environment, environmental noise and electromagnetic interference are more obvious, which further aggravates the difficulty of signal collection. Therefore, designing a voiceprint collection device with high fidelity, multichannel synchronous collection ability, and realizing digital and analog circuit anti-interference through effective power isolation technology has become a key technical problem to improve the quality of audio collection and system reliability. SUMMARY
[0003] The utility model discloses a voiceprint collection device based on linear array, aims at solving the problem of poor multichannel voiceprint signal collection synchronization, insufficient anti-interference ability and large interference of digital circuit to analog circuit in prior art, realizes high-quality synchronous collection of multipoint acoustic signal, and improves the signal acquisition precision and spatial resolution of voiceprint recognition system.
[0004] To achieve the above object, the utility model adopts the following technical scheme:
[0005] A voiceprint collection device based on linear array, comprising a linear array collection unit, a main control processing unit and a power module.
[0006] The linear array collection unit is composed of a linear array of four electret microphones, and each microphone corresponds to an independent in-phase proportional amplifier and a filter circuit.
[0007] The electret microphones are arranged in a linear structure and are used for simultaneously collecting acoustic signals of multiple space points. The gain of each amplifier is set in the range of 30 to 60 times, which can enhance the amplitude of weak acoustic signals to the effective input interval of an analog-to-digital conversion chip. A parallel filter capacitor is provided in the amplification circuit to suppress common-mode interference and high-frequency noise and ensure signal purity.
[0008] The main control processing unit consists of a main control chip and its peripheral circuits, including a crystal oscillator, reset, BOOT startup and programming interface, to ensure stable system operation.
[0009] The main control chip connects to the AD7606 analog-to-digital converter chip via a digital interface to schedule, cache, and upload voiceprint data. This unit has a reserved interface for a W5500 module, supporting Ethernet connection to a host computer for remote transmission or subsequent identification processing.
[0010] The power module uses an external 5V input and is separated into analog power supply and digital power supply circuits through a digital-analog isolation circuit.
[0011] The analog power path uses a B0505-1WR3 isolated DC-DC module to provide isolated 5V analog power to the electret microphone array and analog-to-digital converter chip. The digital power path uses an AMS1117 low-dropout linear regulator to convert 5V to 3.3V for the main control chip and digital circuits. A 10μF electrolytic capacitor is connected in parallel at the regulator input, and a 0.1μF ceramic capacitor is connected in parallel at the output to filter out low-frequency fluctuations and suppress high-frequency interference.
[0012] This invention employs a linear array structure consisting of four electret microphones, along with independent amplification and filtering circuits, to achieve synchronous acquisition of multi-channel acoustic signals. A high-speed multi-channel analog-to-digital converter chip performs parallel digitization of each analog signal, and the main control processing unit manages and transmits the acquired data. The power module design incorporates digital-to-analog isolation technology, providing independent power supplies for the analog and digital circuits, effectively avoiding the impact of power supply interference on acquisition performance. The overall structure contributes to improving the synchronization, integrity, and system stability of acoustic signal acquisition. Attached Figure Description
[0013] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the embodiments are briefly described below.
[0014] Figure 1 A schematic diagram of the device structure provided for an embodiment of this utility model;
[0015] Figure 2 A schematic diagram of the data acquisition unit provided in this embodiment of the utility model;
[0016] Figure 3 Schematic diagram of the main control unit and power module provided for embodiments of this utility model;
[0017] Explanation of reference numerals in the attached figures:
[0018] 1 - upper layer board, 11 - STM32F4 chip, 12 - W5500 interface, 13 - debugging interface, 14 - main control board pin, 15 - power interface, 2 - lower layer board, 21 - AD7606 chip, 22 - microphone array, 23 - collector interface, 24 - amplification circuit. DETAILED DESCRIPTION
[0019] The embodiments of the present application will be described in detail below with reference to the drawings.
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.
[0021] Embodiment: Figure 1 、 Figure 2 and Figure 3 are respectively the physical schematic diagram, the collector unit principle diagram, the main control unit and the power module principle diagram described in the embodiments of the present application, and now the linear array-based voiceprint collection device will be described in detail in combination with Figure 1 、 Figure 2 and Figure 3 .
[0022] As shown in Figure 1 , the embodiments of the present application are composed of two layers of circuit boards, the upper layer board 1 includes a main control unit and a power module, and the lower layer board 2 is a collector unit. Among them, the main control unit includes an STM32F4 main control chip 11, a W5500 interface 12 and a debugging interface 13, the power module includes a power supply interface 15, and the collector unit includes an AD7606 chip 21, a microphone array 22 and an amplification circuit 24. The main control unit and the collector unit are connected through the main control board pin 14 and the collector interface 23.
[0023] As shown in Figure 2 , the collector unit mainly includes four electret microphones, a same-phase proportional amplification circuit, a filter circuit and an analog-digital conversion interface. The electret microphones are arranged in a linear array form in sequence, which are used to collect acoustic signals from different spatial positions. The output end of each microphone is connected to an independent front-end signal processing circuit, and the circuit is composed of a same-phase proportional amplifier and a filter. Specifically:
[0024] Each microphone signal is first connected to a same-phase proportional amplifier input end, and the gain is between 30 times and 60 times, which aims to raise the amplitude of the weak original sound signal to the effective input range that can be recognized by the analog-digital converter;
[0025] The filter capacitor is arranged in parallel in the amplification circuit, high frequency interference and common mode noise are inhibited, and signal purity is improved.
[0026] The analog output signals of all channels are uniformly connected to the input channels of the high-speed multi-channel analog-digital conversion chip, so that the synchronous sampling and digital processing of the multi-channel audio signals are realized.
[0027] The collector circuit is completely independent in structure, is connected to the multiple analog input ends of the AD7606 in parallel, ensures the consistency of the signal collection time of each microphone channel, and thus meets the requirements for the synchronism and spatial resolution in voiceprint collection.
[0028] As shown in Figure 3 , the main control unit mainly comprises a main control chip and peripheral circuits thereof. The main control chip is used for receiving the multi-channel digital voiceprint signals output by the analog-digital conversion chip, and performing buffering, scheduling and data uploading. The main control chip is connected with a crystal oscillator circuit, a reset circuit and a start configuration circuit in periphery, so as to ensure the normal operation of the system and the program burning. The main control chip is connected with the analog-digital conversion chip through an SPI interface, and a communication interface is reserved for connecting with an upper computer or a communication module, so as to realize the transmission of the voiceprint data.
[0029] As shown in Figure 3 , the power module is used for providing stable and isolated power supply for the whole system. The module uses an external 5V DC power supply as input, and divides the power supply into an analog power supply path and a digital power supply path through a digital-analog isolation design.
[0030] In the analog circuit, a B0505-1WR3 type isolation power module is used to output a stable 5V analog voltage, which is supplied to the microphone array, the front-end amplification circuit and the analog-digital conversion chip, so as to ensure the electrical independence and anti-interference ability of the collected signals.
[0031] In the digital circuit, an LDO voltage stabilizing chip is used to stabilize the 5V voltage to 3.3V, which is supplied to the main control chip and the peripheral circuits thereof. An electrolytic capacitor is connected in parallel to the input end of the LDO to filter out low-frequency ripple, and a ceramic capacitor is connected in parallel to the output end of the LDO to suppress high-frequency interference.
[0032] The utility model discloses a linear array collection unit, the cooperative design of main control processing unit and power module constructs a kind of multi-channel synchronous acquisition capability's voiceprint collection device. The device realizes the front-end processing of each acoustic signal by independent amplification and filter circuit, uses analog-digital conversion chip to complete multi-channel synchronous digitization acquisition, and by main control unit carries out signal scheduling and communication management, while cooperating with the power system of digital-analog isolation, ensure the independent power supply and stable operation of digital and analog circuit. The complete technical scheme has complete acquisition, processing and interface function, is applicable to the synchronous acquisition system of multi-channel acoustic signal.
[0033] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A linear array based voiceprint acquisition device, characterized in that, It comprises a linear array acquisition unit, a main control processing unit and a power module, wherein: The linear array acquisition unit is composed of a linear array of four electret microphones, each of which is connected to a same-phase proportional amplifier and a filter circuit for gain amplification and interference suppression of the sound signal, and all channel output signals are input to a high-speed analog-to-digital conversion chip AD7606 for multi-channel synchronous acquisition; The main control processing unit comprises a main control chip STM32F4 and its peripheral circuit, the main control chip is connected with the analog-to-digital conversion chip through an SPI interface, for receiving and processing the multi-channel digital signals converted by the analog-to-digital conversion chip, and realizing data packaging, buffering and uploading; The power module receives external 5V power input, and is divided into an analog power circuit and a digital power circuit through a digital-analog isolation circuit, the analog circuit is powered by an isolated DC-DC module, and the digital circuit outputs 3.3V through an LDO voltage stabilizer for the main control chip.
2. The linear array based voiceprint acquisition apparatus according to claim 1, wherein, The gain of the same-phase proportional amplifier is set between 30 times and 60 times, to ensure that the weak sound signal reaches the effective input range of AD7606.
3. The linear array based voiceprint capturing apparatus according to claim 1, wherein, The filter circuit comprises a capacitor in parallel, for constructing a low-pass filter network to suppress high-frequency interference and common-mode noise.
4. The linear array based voiceprint capturing apparatus according to claim 1, wherein, The peripheral circuit of the main control chip comprises a crystal oscillator circuit, a reset circuit, a start configuration circuit and a download interface.
5. The linear array based voiceprint capturing apparatus according to claim 1, wherein, The main control chip is connected with a communication module W5500, for realizing remote transmission of voiceprint data.
6. The linear array based voiceprint capturing apparatus according to claim 1, wherein, The isolated DC-DC module is B0505-1WR3 type, the LDO voltage stabilizer chip is AMS1117 type, an electrolytic capacitor is connected in parallel at the input end of the LDO, and a ceramic capacitor is connected in parallel at the output end of the LDO, for improving the power quality and suppressing ripple interference.