Noise detection device and printed circuit board

Abstract

The utility model relates to the technical field of noise detection, and discloses a noise detection device and a printed circuit board. The noise detection device comprises an audio acquisition module, an audio amplification module, a detection module, an audio output module and a signal lamp module, the audio amplification module is connected with the audio acquisition module, the audio output module and the detection module, and the detection module is further connected with the signal lamp module; the audio amplification module receives an audio signal output by the audio acquisition module and outputs an audio amplification signal to the control module; the control module outputs a first control signal to the signal lamp module and outputs a second control signal to the audio amplification module according to the audio amplification signal; the audio amplification module outputs an audio amplification signal to the audio output module according to the second control signal. Through high integration and modular design, the device can be detected and debugged in real time on a production line, and a machine does not need to be sent to a third-party laboratory for mute testing, so that a large amount of time and cost are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to noise detection technical field especially relates to noise detection device and printed circuit board. BACKGROUND

[0002] In the process of testing mainboard electric noise in the factory, the current test environment usually needs to have high-precision microphone, mute laboratory and background computer to analyze the audio data collected by the microphone. However, the existing test facility is limited to noise test of complete machine, cannot support noise detection of printed circuit board (PCB) bare board, so that the factory cannot efficiently and flexibly carry out mainboard electric noise detection, and a more convenient and efficient solution is urgently needed. SUMMARY

[0003] The utility model embodiment mainly solves how to effectively detect the technical problem of mainboard electric noise in the environment of not depending on mute laboratory and supporting PCB bare board test.

[0004] To solve the above technical problem, one technical scheme of the utility model is provided: a noise detection device, the noise detection device includes: an audio acquisition module, an audio amplification module, a detection module, an audio output module and a signal lamp module, the audio amplification module is connected with the audio acquisition module, the audio output module and the detection module respectively, the detection module is also connected with the signal lamp module;The audio amplification module receives the audio signal output by the audio acquisition module, and outputs the audio amplification signal to the control module;The control module outputs the first control signal to the signal lamp module and the second control signal to the audio amplification module according to the audio amplification signal;The audio amplification module outputs the audio amplification signal to the audio output module according to the second control signal.

[0005] In some embodiments, the audio acquisition module includes a microphone element, a bias circuit, a coupling capacitor and an output interface, the microphone element is connected with the bias circuit and the coupling capacitor respectively, and the coupling capacitor is also connected with the output interface.

[0006] In some embodiments, the audio amplification module includes an LM386 chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a first resistor, the LM386 chip is connected with the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the first resistor respectively, and the first capacitor is also connected with the output interface.

[0007] In some embodiments, the detection module comprises an input unit, a signal processing unit and a control unit, the signal processing unit is connected with the input unit and the control unit respectively, and the input unit is further connected with the fourth capacitor.

[0008] In some embodiments, the signal lamp module comprises an LED lamp, a current limiting resistor and a driving circuit, the driving circuit is connected with the LED lamp and the current limiting resistor respectively, and the driving circuit is further connected with the control unit.

[0009] In some embodiments, the noise detection device further comprises a power module, the power module is connected with the audio acquisition module, the audio amplification module, the detection module, the audio output module and the signal lamp module respectively.

[0010] To solve the above technical problems, another technical scheme of the utility model provides a printed circuit board which is provided with the noise detection device.

[0011] Different from the prior art, the utility model embodiment provides a noise detection device and a printed circuit board, the noise detection device comprises an audio acquisition module, an audio amplification module, a detection module, an audio output module and a signal lamp module, the audio amplification module is connected with the audio acquisition module, the audio output module and the detection module respectively, and the detection module is further connected with the signal lamp module;The audio amplification module receives the audio signal output by the audio acquisition module, and outputs the audio amplification signal to the control module;The control module outputs the first control signal to the signal lamp module and the second control signal to the audio amplification module according to the audio amplification signal;The audio amplification module outputs the audio amplification signal to the audio output module according to the second control signal.Through the highly integrated and modular design, the device can be detected and debugged in real time on the production line, and the machine does not need to be sent to a third party laboratory for mute test, thereby a large amount of time and cost are saved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows, obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of the drawings.

[0013] Figure 1 It is a structural schematic block diagram of the noise detection device provided by the utility model embodiment. DETAILED DESCRIPTION

[0014] For the convenience of understanding the utility model, the utility model will be explained in more detail below in combination with the drawings and specific embodiments. It should be noted that when one element is described as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween.

[0015] Unless otherwise defined, all technical and scientific terms used in the specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0016] Please refer to Figure 1 , Figure 1 is a structure schematic block diagram of a noise detection device provided by the utility model embodiment. As Figure 1 shown, the noise detection device 100 includes an audio acquisition module 10, an audio amplification module 20, a detection module 30, an audio output module 40 and a signal lamp module 50. The audio amplification module 20 is connected with the audio acquisition module 10, the audio output module 40 and the detection module 30 respectively, and the detection module 30 is also connected with the signal lamp module 50.

[0017] For the above-mentioned audio acquisition module 10, in the embodiment, the audio acquisition module 10 is the front-end part of the noise detection device 100, responsible for capturing sound signals from the environment. The module is usually composed of a microphone, which converts the surrounding sound waves into electrical signals. The working principle of the audio acquisition module 10 is that the sensing element (such as a capacitive or piezoelectric element) of the microphone senses the vibration of the sound wave in the air, and then converts these vibrations into analog electrical signals. The audio acquisition module 10 needs to have a certain sensitivity and frequency response range to ensure that it can capture noise information from low frequency to high frequency. The output signal of the audio acquisition module 10 will be transmitted to the subsequent audio amplification module 20 for further processing.

[0018] In some embodiments, the audio acquisition module 10 includes a microphone element, a bias circuit, a coupling capacitor and an output interface, the microphone element is connected with the bias circuit and the coupling capacitor respectively, and the coupling capacitor is also connected with the output interface.

[0019] It can be understood that the audio acquisition module 10 can be a microphone, and the design of the microphone is usually very precise and needs to have high sensitivity and frequency response capability to capture a wide range of sound spectrum and ensure accurate audio acquisition. In the embodiment, the microphone is composed of multiple electronic elements, each element plays a different role to ensure that the microphone can effectively capture audio signals from the environment and transmit them to the subsequent module.

[0020] Among them, the microphone element is the core part of the microphone, responsible for converting sound waves into electrical signals. The microphone element usually has high sensitivity and frequency response range, can capture low frequency sound as low as 20Hz and high frequency sound as high as 20kHz. The microphone element needs to have small noise and keep low distortion to ensure the accuracy of the audio signal.

[0021] The role of the bias circuit is to provide the necessary operating voltage for the microphone element. Because the signal output of the microphone element is very weak, it must be provided with appropriate bias current or voltage by the bias circuit so that it can work normally. The bias circuit usually achieves this goal by providing a stable voltage (such as positive voltage or negative voltage), so as to ensure that the microphone element can capture sound signals in the ideal working state. For capacitive microphones, the bias circuit can also help generate stable electrical signal output by providing a stable DC voltage to the capacitor.

[0022] The main role of the coupling capacitor is to isolate the audio signal output by the microphone element from the subsequent circuit (such as the amplifier circuit), avoiding the influence of direct current on the work of the subsequent circuit. The coupling capacitor can also transmit alternating current signals, i.e. audio signals, while blocking low-frequency direct current components. In actual application, the coupling capacitor usually transmits the voltage signal generated by the microphone element to the amplifier circuit or subsequent processing unit, while ensuring the integrity of the signal and preventing the introduction of interference and noise.

[0023] The output interface is the output port of the microphone, responsible for connecting the audio signal transmitted through the coupling capacitor to the subsequent circuit, such as the audio amplifier module 20. The output interface is usually a standard electrical interface, such as a 3.5mm jack, RCA interface or digital output interface, etc. The output interface needs to be able to adapt to different types of circuits or systems, ensuring stable transmission of audio signals and achieving compatibility in different systems.

[0024] The working process of the audio acquisition module 10 is as follows: first, the microphone element receives sound wave vibration from the environment and converts it into weak electrical signals. Second, the bias circuit provides a stable operating voltage for the microphone element to ensure that the microphone can work normally and transmit accurate audio signals. Third, the audio signal is transmitted through the coupling capacitor, which isolates the direct current component in the signal to ensure that only alternating current components (i.e. audio signals) can be transmitted to the subsequent circuit. Finally, the audio signal is transmitted to the next level of audio amplifier module 20 through the output interface for subsequent processing and analysis.

[0025] For the above-mentioned audio amplification module 20, in the present embodiment, the role of the audio amplification module 20 is to receive signals from the audio acquisition module 10 and amplify them so that the signals can be better processed by the subsequent detection module 30. This module is usually composed of operational amplifiers and gain control circuits. When the audio signal passes through the audio amplification module 20, it will undergo a gain process, and the size of the gain can be automatically adjusted according to the strength of the input signal. The audio amplification module not only needs to amplify the amplitude of the signal, but also needs to maintain the quality of the signal to avoid distortion and noise interference. In addition, the audio amplification module 20 is also responsible for transmitting the amplified signal to the detection module 30 for further analysis, and transmitting the signal to the audio output module 40 for the user to listen to the amplified sound signal. The control mechanism of the audio amplification module 20 enables it to adjust the gain according to the second control signal from the control module 30, so as to achieve fine control of the audio output.

[0026] In some embodiments, the audio amplification module 20 includes an LM386 chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a first resistor, the LM386 chip is connected with the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, and the first resistor respectively, and the first capacitor is also connected with the output interface.

[0027] Among them, LM386 is a small low-power audio amplifier chip, commonly used to amplify weak audio signals to a level that can drive a speaker or audio device. It is a differential amplifier with high gain, suitable for low-power applications. Its pin configuration is as follows: pin 1 (GAIN): used to set the gain (amplification factor), the gain can be adjusted by external resistance and capacitance. Pins 2 (GND) and 4 (GND) are grounded. Pin 3 (input) is used to receive input signals (such as audio signals output by the audio acquisition module 10). Pin 5 (output) is used to output the amplified audio signal, usually connected to a speaker or audio device (such as the audio output module 40). Pin 6 (VCC) is the power input terminal, usually connected to a 5V to 12V DC power supply. Pin 7 (N.C.) is not connected, and pin 8 (VCC) is the power terminal.

[0028] The first capacitor (C1) is an input capacitor, which is used to isolate the input audio signal from the input of the LM386 amplifier while allowing AC signals to pass through. It mainly plays the role of removing DC offset and coupling signals. Its capacity is usually 0.1 μF or 10 μF. The specific choice depends on the frequency range of the input signal and the characteristics of the signal source. Its working principle is that C1 prevents any DC voltage from the input source (such as the DC bias voltage of a microphone) from entering the input of the LM386, ensuring that only pure audio signals (AC signals) are received by the input.

[0029] The second capacitor (C2) is a gain capacitor, usually used with a resistor (R1), connected between pin 1 and pin 8 of the LM386 chip, to adjust the gain of the LM386. By adjusting the values of C2 and R1, the gain can be set to 10, 20, or 50 times. Its capacity is usually 10μF (sometimes 1μF or 100nF can be chosen, depending on the gain requirement). Its working principle is that C2 and R1 (gain resistor) together determine the gain of the LM386. The combination of C2 and R1 allows the LM386 to adjust between low power consumption and appropriate gain, suitable for amplifying audio signals.

[0030] The third capacitor (C3) is a power supply decoupling capacitor, used to stabilize the power input of the LM386, reducing the interference of power supply noise on the amplification of audio signals. It can filter out high-frequency noise or fluctuations in the power supply, ensuring stable power supply. Its capacity is usually 100nF to 10μF. A smaller capacitor (such as 100nF) is chosen to filter out high-frequency noise, or a larger capacitor is used to handle lower-frequency noise. Its working principle is that C3 is connected between the power input (VCC) and ground of the LM386 chip, ensuring that the audio amplification module 20 obtains stable power supply, avoiding the interference of power supply noise or fluctuations on the amplification process of audio signals.

[0031] The fourth capacitor (C4) is an output capacitor, used to couple the amplified audio signal of the LM386. Its role is to remove the DC component, allowing only AC audio signals to pass through, protecting the subsequent circuit or speaker from DC voltage damage. Its capacity is usually 100μF or 220μF, and the choice of capacity depends on the frequency of the output signal and the load driven. Its working principle is that C4 blocks any direct current from being transmitted to the audio output, while allowing audio signals to pass through, transmitted to the speaker or audio device. It ensures that the output signal only has AC components, i.e. audio signals.

[0032] The first resistor (R1) is a gain setting resistor, used with C2 to set the gain of the LM386. By changing the resistance value of R1, the amplification factor of the audio signal can be adjusted. Its resistance value is usually selected between 10kΩ and 50kΩ. The value of R1 and the capacity of C2 together determine the gain factor. Its working principle is that R1 and C2 jointly act between pin 1 and pin 8 of the LM386, adjusting the gain. The smaller the value of R1, the higher the gain.

[0033] The workflow of the audio amplification module 20 is as follows: first, the external audio signal (such as a microphone signal) enters the input end (pin 3) of the LM386 through the input capacitor (C1). The input capacitor removes any DC component, allowing only audio signals to pass through. Second, after the input signal enters the LM386, the gain of the LM386 is adjusted by setting the gain capacitor (C2) and the gain resistor (R1). By changing the values of R1 and C2, the gain can be adjusted between 10 and 200 times. Among them, the LM386 needs a stable power supply, and the power supply decoupling capacitor (C3) ensures the stability of the power supply, avoiding power supply noise interference during amplification. Third, the amplified audio signal is transmitted to the output end (pin 5) through the output capacitor (C4). C4 removes the DC component, allowing only AC signals (audio signals) to pass through, ensuring that subsequent devices (such as speakers or other audio processing devices) receive clear audio signals. Finally, the audio signal is transmitted to the speaker or other devices (such as the detection module 30 or the audio output module 40) through the output end, completing the amplification process.

[0034] For the above-mentioned detection module 30, in this embodiment, the main function of the detection module 30 is to analyze and process the amplified audio signal, judge the intensity and characteristics of the noise, and make a response. This module usually includes a digital signal processing (DSP) unit or a dedicated noise detection algorithm. The detection module 30 first performs spectral analysis on the audio signal, and identifies whether there is abnormal noise or noise of a specific frequency by calculating the frequency components of the audio signal. The detection module 30 can also include a noise threshold setting function, which will send a corresponding signal or notification when the detected noise exceeds the set threshold. The detection module 30 is also connected with the signal light module 50, which triggers the corresponding indicator light according to the strength or type of the signal, helping the user to understand the noise state. These functions enable the detection module 30 to intelligently monitor environmental noise and drive other modules to respond to detected noise events through control signals.

[0035] In some embodiments, the detection module 30 includes an input unit, a signal processing unit, and a control unit, the signal processing unit is connected with the input unit and the control unit respectively, and the input unit is also connected with the fourth capacitor.

[0036] Among them, the detection module 30 is a single-chip microcomputer, which is a microcomputer integrated with a microprocessor (CPU), memory (RAM and ROM), input and output interfaces (GPIO, ADC, PWM, etc.), and other peripherals (such as timers, serial ports, etc.). In the noise detection device 100, the single-chip microcomputer is mainly used to receive audio signals, process signals, analyze noise characteristics, and control other modules according to the preset logic.

[0037] The input unit is mainly composed of an analog-to-digital converter (ADC) and a sampling circuit. The ADC module converts the audio signal (usually an analog signal represented by voltage changes) into a digital signal, facilitating subsequent signal processing by the single-chip microcomputer. Its working principle is as follows: the audio amplification module 20 transmits the amplified audio signal to the input unit, and the analog-to-digital converter (ADC) in the input unit converts these analog signals into digital data. After receiving these digital data, the input unit of the single-chip microcomputer will hand them over to the signal processing unit for further analysis.

[0038] The signal processing unit is the core functional part of the detection module 30, responsible for further analyzing, processing, and judging digital signals to identify the characteristics of noise and decide whether to trigger certain control actions based on the analysis results. The signal processing unit usually includes: a microcontroller unit (MCU): as the core of signal processing, responsible for performing computational tasks such as noise analysis, frequency spectrum analysis, etc. Digital signal processing (DSP) function: although DSP is usually a dedicated processor, in many single-chip microcomputers, some basic DSP functions are also built-in to help perform efficient signal processing. Memory (RAM): stores the audio data being processed and intermediate results, helping to perform complex analysis. Timer: used to control real-time sampling and processing of signals. Its working principle is as follows: the signal processing unit uses digital signal processing (DSP) technology or some algorithms (such as fast Fourier transform FFT) to analyze the frequency characteristics and amplitude of the audio signal, to judge the intensity of the noise or whether it exceeds the set noise threshold. When detecting that the noise intensity is too high, the signal processing unit will trigger the corresponding feedback mechanism.

[0039] The control unit is the output part of the detection module 30, responsible for controlling other modules of the system (such as the signal light module 50 and the audio amplification module 40) according to the analysis results of the signal processing unit. The control unit adjusts the behavior of the system by sending control signals, such as adjusting the gain of the audio amplification module according to the intensity of the noise, or controlling the signal light module to display different colors according to the noise state. The control unit is composed of an output interface, a GPIO port (general-purpose input / output port), and related control logic. The output interface communicates with external devices such as the signal light module and the audio amplification module through the GPIO port to send control signals. Its working principle is as follows: the control unit generates control signals based on the noise analysis results from the signal processing unit using pre-set logic. For example, if the noise signal intensity exceeds the pre-set threshold, the control unit will issue a "high noise" alarm signal to drive the red light of the signal light module to turn on. If the noise signal intensity is below the threshold, the control unit may trigger the green light to turn on, indicating that the environmental noise is within an acceptable range.

[0040] The working process of the detection module 30 is as follows: first, through the input unit, the audio signal (the signal collected from the microphone and amplified) is transmitted to the ADC module of the single-chip microcomputer for analog-digital conversion. Second, the digital signal enters the signal processing unit, and the single-chip microcomputer analyzes the characteristics of the noise signal using digital signal processing technology (such as FFT) to determine the strength and frequency of the noise. According to the analysis result, the signal processing unit determines whether the noise exceeds the set threshold. If the noise exceeds the threshold, the single-chip microcomputer determines that the noise is too high and needs to be alarmed; otherwise, it is determined to be normal noise. Finally, according to the analysis result, the control unit outputs the corresponding control signal: if the noise is excessive, the control signal is sent to the signal lamp module to light the red warning light. If the noise is within the normal range, the control signal is sent to the signal lamp module to light the green light. If necessary, the single-chip microcomputer can also send a signal to the audio amplification module 20 to adjust the gain.

[0041] The detection module based on the single-chip microcomputer in this embodiment can efficiently and real-time process noise signals and provide feedback as needed, ensuring the accuracy and real-time performance of the noise detection device.

[0042] For the above-mentioned audio output module 40, in this embodiment, the audio output module 40 is the output end of the noise detection device 100, which is used to convert the amplified audio signal into sound form for output for the user to listen. This module is usually composed of a loudspeaker or a buzzer. The audio output module 40 receives the amplified signal from the audio amplification module 20, processes it as needed, converts the signal into a sound wave, and plays it through the loudspeaker. The working principle of the audio output module 40 is to convert the electrical signal into the vibration that the loudspeaker can emit through the drive circuit, and then produce audible sound. For the noise detection device 100, an important function of the audio output module 40 is to provide real-time feedback of the environmental noise to the user, so that the user can understand the current noise condition of the environment through the sound.

[0043] For the above-mentioned signal lamp module 50, in this embodiment, the signal lamp module 50 is an indication module in the noise detection device 100, which is responsible for displaying the state of the environmental noise according to the analysis result of the detection module 30. This module is usually composed of multiple LED indicator lights, which may include indicator lights of different colors and flashing modes to represent different noise levels or noise states.

[0044] In some embodiments, the signal lamp module 50 includes LED lights, current limiting resistors, and a drive circuit, and the drive circuit is connected with the LED lights and the current limiting resistors respectively. The drive circuit is also connected with the control unit.

[0045] The LED light is the core component of the signal light module 50, responsible for providing visual feedback. LEDs (Light Emitting Diodes) can emit different colors of light when powered on, and different colors of LED lights can represent different states. The working principle is that the LED light emits light by being powered on, and when the control signal of the single-chip microcomputer drives, the color and brightness of the LED light will change. It can be understood that the LED light is mainly used to indicate the state of the noise. For example, when the noise is normal, the LED may display green; when the noise exceeds the standard, the LED light may turn red or yellow. This visual feedback helps users quickly judge the state of the noise environment.

[0046] The current-limiting resistor is usually selected according to the rated working current of the LED. According to Ohm's law, the current-limiting resistor converts the voltage difference between the power supply voltage and the LED voltage into an appropriate current, allowing the LED light to work at an appropriate current and prevent overcurrent damage to the LED. It can be understood that the LED light needs a certain current when working, but if the current is too large, it will burn out the LED. Therefore, the current-limiting resistor is connected in series in the LED light circuit to limit the current flowing through the LED, ensuring that the LED works within a safe current range.

[0047] The driving circuit is the key part of controlling the switching and brightness of the LED light, responsible for activating or turning off the LED light according to the control signal of the single-chip microcomputer (detection module), and adjusting its brightness or color. The working principle is that the driving circuit will determine the switching state of the LED light according to the output signal of the single-chip microcomputer (such as the high and low levels of GPIO). If the noise exceeds the standard, the single-chip microcomputer outputs a high level, and the driving circuit makes the LED light light up red; if the noise is normal, the single-chip microcomputer outputs a low level, and the driving circuit makes the LED light light up green or yellow. It can be understood that the driving circuit responds to the control signal output by the detection module by controlling the current, brightness, or switching state of the LED. The driving circuit is usually composed of transistors, MOSFETs, or other electronic switching elements, and drives the working state of the LED light according to the control signal output by the single-chip microcomputer.

[0048] The embodiment can intuitively and real-time display the state of the noise environment through the signal light module, providing clear feedback to the user. It indicates whether the current noise is normal through simple color changes (such as red, green, and yellow), effectively helping users quickly judge the noise level and take appropriate measures.

[0049] In some embodiments, the noise detection device 100 also includes a power module 60 (not shown in the figure), which is connected to the audio acquisition module 10, the audio amplification module 20, the detection module 30, the audio output module 40, and the signal light module 50, respectively.

[0050] The power module 60 is a centralized power management system responsible for ensuring that each module receives the appropriate voltage and current to function properly. Its primary function is to convert an external power source (such as AC power, DC power, or a battery) into the necessary voltage and current required within the noise detection device 100 to power each module. Different modules may require different voltages and currents, so the power module 60 must provide multiple voltage outputs and be able to stabilize the power supply. The power module 60 must convert the input voltage to a range suitable for each module to function.

[0051] The power module 60 operates as follows: first, it receives an external power source, which could be AC power (such as 220V or 110V AC) or DC power (such as a 12V battery). If it is AC power, the power module first converts it to a suitable lower voltage using a transformer. For AC power, the transformer outputs an AC signal that is converted to DC by a rectifier circuit, and a filter capacitor smooths out current fluctuations and noise to provide a relatively stable DC power supply. Second, the power module 60 converts the rectified voltage to multiple appropriate output voltages (such as +5V, +3.3V, +12V, etc.) using DC-DC converters. The converters and regulators ensure that each module receives a stable voltage and prevent excessive voltage or low voltage. Finally, the power module 60 distributes the current to each module according to their current requirements, ensuring that each module receives the necessary current. For example, the audio acquisition module 10 and the signal light module 50 require less current, while the audio amplification module 20 requires more current to drive the audio amplification function. In addition, the power module 60 contains protection circuits that automatically cut off the power supply in the event of excessive current, short circuits, overvoltage, and other abnormalities to protect the system from damage. Under normal operation, the power module 60 outputs stable voltage and current to each module.

[0052] By providing a stable power supply, the power module can ensure the normal operation of the audio acquisition, signal amplification, signal processing, audio output, and signal light modules, avoiding system instability or failure due to voltage fluctuations or insufficient current. It also provides necessary power protection functions to avoid power failure damaging system components, ensuring long-term reliability of the device.

[0053] The utility model embodiment provides a kind of noise detection device 100, by the process modularization such as audio acquisition, signal amplification, noise detection, control signal output and feedback mechanism, realize noise detection and feedback.Firstly, audio acquisition module 10 is responsible for collecting sound signal from environment.It converts sound into electrical signal by microphone element, provides an original audio input signal.The signal is processed by bias circuit and coupling capacitor, and finally output to audio amplification module 20.Secondly, after audio amplification module 20 receives the signal output by audio acquisition module 10, it will be amplified.The amplified audio signal will be passed to detection module 30 for further analysis and processing.During amplification, audio amplification module 20 not only increases signal amplitude, but also ensures that the signal remains clear after amplification, to avoid inaccurate noise detection due to weak signal.Finally, detection module 30 receives the amplified audio signal from audio amplification module 20.Detection module 30 analyzes the signal and determines whether it exceeds the set threshold based on noise intensity.According to the analysis result, detection module 30 generates two control signals: the first control signal: this control signal is sent to signal light module 50 to control the color or state of LED indicator light.For example, when the noise is below the set threshold, the LED may display green;when the noise reaches a dangerous level, the LED displays red, prompting the user to pay attention.The second control signal: this control signal is sent to audio output module 40.If the noise level exceeds the set threshold, the second control signal can trigger audio output module 40 to emit an alarm sound, reminding the user to pay attention to environmental noise changes.

[0054] It should be noted that the noise detection device 100, through its highly integrated and modular design, especially the unique connection relationship between the various modules, makes the device not only has efficient noise detection capability, but also can be flexibly applied in actual production environment.Audio acquisition module 10, audio amplification module 20, detection module 30, audio output module 40 and signal light module 50 work closely together to realize real-time noise monitoring and feedback.When the collected noise signal is enhanced by audio amplification module 20, detection module 30 can quickly analyze the audio signal to determine whether the noise exceeds the set threshold, and adjust audio output module 40 and signal light module 50 through control signal to provide intuitive sound and visual feedback.This close cooperation mode enables the device to monitor and debug in real time on the production line without sending the machine to a third-party laboratory for noise testing, thereby saving a lot of time and cost.As power module 60 provides stable power support for each module, the entire device can operate efficiently in different working environments.Therefore, the noise detection device 100 not only has small footprint and is suitable for production line deployment, but also can perform noise testing and adjustment at any time during production, avoiding the high construction cost and inconvenient external testing process required by traditional noise laboratory measurement.

[0055] The utility model embodiment further provides a printed circuit board, the printed circuit board includes above noise detection device 100, for the specific structure and function of noise detection device 100 can refer to above embodiment, here will not be repeated.

[0056] It should be noted that the preferred embodiments of the present application are described in the specification and drawings of the present application, but the present application can be implemented in many different forms and is not limited to the embodiments described in the specification, and these embodiments are not additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Furthermore, the above technical features continue to combine, form various embodiments not listed above, which are considered to be within the scope of the present application. Furthermore, for those skilled in the art, the above description can be improved or transformed, and all these improvements and transformations should be within the protection scope of the appended claims of the present application.

Claims

1. A noise detection apparatus, characterized by, The noise detection device comprises an audio acquisition module, an audio amplification module, a detection module, an audio output module and a signal lamp module, the audio amplification module is connected with the audio acquisition module, the audio output module and the detection module respectively, and the detection module is further connected with the signal lamp module; The audio amplification module receives the audio signal output by the audio acquisition module and outputs an audio amplification signal to the control module; the control module outputs a first control signal to the signal lamp module and a second control signal to the audio amplification module according to the audio amplification signal; and the audio amplification module outputs the audio amplification signal to the audio output module according to the second control signal.

2. The noise detection apparatus of claim 1, wherein The audio acquisition module comprises a microphone element, a bias circuit, a coupling capacitor and an output interface, the microphone element is connected with the bias circuit and the coupling capacitor respectively, and the coupling capacitor is further connected with the output interface.

3. The noise detection apparatus of claim 2, wherein The audio amplification module comprises an LM386 chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a first resistor, the LM386 chip is connected with the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the first resistor respectively, and the first capacitor is further connected with the output interface.

4. The noise detection apparatus of claim 3, wherein The detection module comprises an input unit, a signal processing unit and a control unit, the signal processing unit is connected with the input unit and the control unit respectively, and the input unit is further connected with the fourth capacitor.

5. The noise detection apparatus of claim 4, wherein The signal lamp module comprises an LED lamp, a current limiting resistor and a driving circuit, the driving circuit is connected with the LED lamp and the current limiting resistor respectively, and the driving circuit is further connected with the control unit.

6. The noise detection apparatus of claim 1, wherein The noise detection device further comprises a power module, and the power module is connected with the audio acquisition module, the audio amplification module, the detection module, the audio output module and the signal lamp module respectively.

7. A printed circuit board, characterized by The printed circuit board is provided with the noise detection device according to any one of claims 1 to 6.

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