Circuit capable of realizing intelligent noise reduction

Abstract

The utility model relates to the technical field of Bluetooth earphones, in particular to a circuit capable of realizing intelligent noise reduction, which comprises a main control chip, a microphone detection circuit, a power supply charging circuit, an indicator lamp circuit, a key circuit, a power amplifier circuit and a headset output circuit, and the pins comprise a differential analog signal input pin, a power amplification output pin, a battery power supply pin, an internal function power supply pin, a call microphone signal input pin, a key control pin and a crystal oscillator I / O pin. According to the invention, adaptive filtering, echo cancellation and AI intelligent noise reduction are realized, the noise reduction effect is significantly improved, clearer and purer hearing experience is provided for a user, and more efficient noise reduction is realized through coupling of the microphone detection circuit and the microphone feedback pin and design of the feedforward noise reduction reference pin and the feedback noise reduction control pin.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bluetooth headset, concretely is a kind of can realize intelligent noise reduction circuit. BACKGROUND

[0002] In modern society, with the acceleration of urbanization and the popularity of transportation tools, people are increasingly exposed to noisy environments. Noise not only affects people's daily life and work efficiency, but also can pose potential threats to hearing health. Therefore, noise reduction technology has gradually become a research hotspot in the field of audio equipment. Traditional noise reduction methods, such as passive noise reduction, can isolate external noise to some extent, but their effectiveness is limited, and often at the expense of sound quality and wearing comfort.

[0003] In recent years, active noise cancellation (ANC) technology has attracted much attention due to its efficient and intelligent noise reduction effect. Active noise cancellation technology captures external noise signals and generates counter-wave signals with opposite phase and matching amplitude, thereby achieving mutual cancellation of noise at the earphone or loudspeaker. This technology can significantly reduce the noise level perceived by users and improve the use experience of audio equipment.

[0004] However, existing active noise reduction circuits often have low integration, limited noise reduction effect, and single function. For example, some circuits only use a single feedforward or feedback microphone for noise collection, making it difficult to capture environmental noise comprehensively. Some other circuits lack the ability to intelligently adjust the noise reduction effect, and cannot provide the best audio experience according to different use scenarios. In addition, traditional circuits have many shortcomings in power management, user interaction, and audio output quality. SUMMARY

[0005] (I) Technical problems solved

[0006] To address the shortcomings of existing technology, the utility model provides a kind of can realize intelligent noise reduction circuit.

[0007] (II) Technical solutions

[0008] In order to achieve the above object, the utility model provides the following technical scheme: A can realize intelligent noise reduction circuit, including main control chip, microphone detection circuit, power charging circuit, pilot lamp circuit, button circuit, power amplifier circuit and earphone output circuit, a plurality of pins are equipped on the main control chip, and the pin includes differential analog signal input pin, power amplification output pin, battery power supply pin, internal function power supply pin, talk microphone signal input pin, button control pin, crystal oscillator I / O pin, charging pilot lamp control pin, working state pin, microphone feedback pin and analog output differential matrix output pin, the microphone detection circuit is coupled with the microphone feedback pin, the power charging circuit is coupled with the battery power supply pin and internal function power supply pin, the earphone output circuit is coupled with the talk microphone signal input pin, the pilot lamp circuit is coupled with the charging pilot lamp control pin and working state pin, the differential analog signal input pin is equipped at least, and the differential analog signal input pin includes wake up pin and earphone power amplifier control pin, the wake up pin is coupled with the button circuit, the earphone power amplifier control pin is coupled with the power amplifier circuit, the analog output differential matrix output pin is coupled with the power amplifier circuit.

[0009] Preferably, the power amplification output pin, internal function power supply pin and crystal oscillator I / O pin are each equipped with at least two.

[0010] Further preferably, the working state pin further includes Bluetooth state and lifting interface.

[0011] Again preferably, the microphone feedback pin includes feedforward noise reduction reference pin and feedback noise reduction control pin, and each is equipped with at least two pins.

[0012] Preferably, the analog output differential matrix output pin is equipped with at least four.

[0013] Further preferably, a plurality of expansion pins are equipped on the main control chip.

[0014] Again preferably, a digital signal processor is configured on the main control chip, an audio processing system is equipped on the digital signal processor, and the audio processing system is used for adaptive filtering, echo cancellation and AI intelligent noise reduction.

[0015] (Three) beneficial effects

[0016] Compared with the prior art, the utility model provides a kind of can realize intelligent noise reduction circuit, with following beneficial effects:

[0017] Efficient noise reduction performance:

[0018] Through the digital signal processor (DSP) and audio processing system on the main control chip, adaptive filtering, echo cancellation and AI intelligent noise reduction are realized, significantly improving the noise reduction effect and providing users with a clearer and purer auditory experience.

[0019] The coupling of the microphone detection circuit with the microphone feedback pin, as well as the design of the feed-forward noise reduction reference pin and the feedback noise reduction control pin, enables the circuit to more accurately capture and analyze noise, achieving more efficient noise reduction.

[0020] Flexible audio processing capabilities:

[0021] The design of the differential analog signal input pin, including the wake-up pin and the earphone power amplifier control pin, enables the circuit to handle multiple audio signals simultaneously, such as environmental noise, user voice, and earphone power amplifier control signals.

[0022] The analog output differential matrix output pin is designed with at least four pins, supporting the output of multiple audio signals and achieving stereo sound effects or connecting multiple speakers / earphones.

[0023] Stable power management:

[0024] The coupling of the power charging circuit with the battery power supply pin and the internal function power supply pin ensures stable power supply and efficient charging of the circuit, prolonging the device's usage time.

[0025] The combination of the charging indicator light control pin and the working status pin provides users with intuitive feedback on the charging status and working status.

[0026] Convenient user interaction:

[0027] The coupling of the key circuit with the wake-up pin allows users to easily wake up the circuit or trigger specific functions through the keys.

[0028] The Bluetooth status indication in the working status pin makes it easy for users to know whether they have connected a Bluetooth device.

[0029] The design of the up-down interface allows users to conveniently adjust the volume or perform other control operations.

[0030] High integration and expandability:

[0031] Multiple pins and functional modules are provided on the main control chip, achieving high integration of the circuit, reducing the number of external components, and simplifying circuit design.

[0032] The power amplification output pin, internal function power supply pin, and crystal oscillator I / O pin are each designed with at least two pins, enhancing the circuit's expandability and flexibility.

[0033] The expansion pins on the main control chip facilitate future functional expansion or upgrades.

[0034] Excellent sound quality:

[0035] The coupling between the headphone amplifier control pins and the amplifier circuit, as well as the design of the analog output differential matrix output pins, ensure high-quality audio signal transmission and amplification, thus improving sound quality.

[0036] The audio processing system on a digital signal processor uses advanced algorithms to process audio signals, further improving sound quality.

[0037] Intelligent application experience:

[0038] The application of AI intelligent noise reduction technology enables the circuit to automatically adjust noise reduction parameters according to changes in ambient noise and user voice, achieving a more intelligent noise reduction effect.

[0039] The design of the Bluetooth status indicator and the lifting interface enables the circuit to wirelessly connect and interact with other smart devices, enhancing the user experience. Attached Figure Description

[0040] Figure 1 This is a schematic diagram illustrating the working principle and structure of this utility model;

[0041] Figure 2 This is a schematic diagram of the main control chip structure of this utility model;

[0042] Figure 3 This is a schematic diagram of the microphone detection circuit of this utility model;

[0043] Figure 4 This is a schematic diagram of the power supply charging circuit of this utility model;

[0044] Figure 5 This is a schematic diagram of the indicator light circuit of this utility model;

[0045] Figure 6 This is a schematic diagram of the button circuit of this utility model;

[0046] Figure 7 This is a schematic diagram of the power amplifier circuit of this utility model;

[0047] Figure 8 This is a schematic diagram of the headset output circuit of this utility model;

[0048] In the diagram: 1. Differential analog signal input pin; 2. Power amplifier output pin; 3. Battery power supply pin; 4. Internal function power supply pin; 5. Microphone signal input pin; 6. Key control pin; 7. Crystal oscillator I / O pin; 8. Charging indicator control pin; 9. Working status pin; 10. Microphone feedback pin; 11. Analog output differential matrix output pin. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] Please see Figures 1-8 This utility model relates to an intelligent noise reduction circuit, comprising a main control chip, a microphone detection circuit, a power charging circuit, an indicator light circuit, a button circuit, a power amplifier circuit, and a headset output circuit. The main control chip has several pins, including a differential analog signal input pin 1, a power amplifier output pin 2, a battery power supply pin 3, an internal function power supply pin 4, a call microphone signal input pin 5, a button control pin 6, a crystal oscillator I / O pin 7, a charging indicator light control pin 8, a working status pin 9, a microphone feedback pin 10, and an analog output differential matrix output pin 11. The microphone... The detection circuit is coupled to the microphone feedback pin 10. The power charging circuit is coupled to the battery power supply pin 3 and the internal function power supply pin 4. The headset output circuit is coupled to the call microphone signal input pin 5. The indicator light circuit is coupled to the charging indicator light control pin 8 and the working status pin 9. The differential analog signal input pin 1 has at least 4 pins, and the differential analog signal input pin 1 includes a wake-up pin and a headphone amplifier control pin. The wake-up pin is coupled to the button circuit. The headphone amplifier control pin is coupled to the amplifier circuit. The analog output differential matrix output pin 11 is coupled to the amplifier circuit.

[0051] This intelligent noise reduction circuit, centered around a main control chip, primarily utilizes Active Noise Cancellation (ANC) technology. Through the coordinated operation of a highly integrated main control chip, microphone detection circuit, power charging circuit, indicator light circuit, button circuit, power amplifier circuit, and headset output circuit, it achieves efficient elimination of external noise. The circuit employs Hybrid ANC and Adaptive ANC technologies, combining feedforward and feedback microphones to capture and analyze external noise signals, generating opposing sound waves for inverse interference, thereby achieving noise reduction.

[0052] Main control chip:

[0053] The main control chip is the core of the entire intelligent noise reduction circuit, and it has multiple pins for connecting and controlling various circuit modules. Key pins include:

[0054] Differential analog signal input pin 1 (at least 4): Receives audio signals from different microphones, supports wake-up pins and headphone amplifier control pins.

[0055] Power amplifier output pin 2 (at least 2): Used to amplify audio signals to drive speakers or headphones.

[0056] Battery power supply pins 3 (at least 2): provide a stable power supply to the circuit.

[0057] Internal power supply pins 4 (at least 2): provide operating voltage for internal circuit modules.

[0058] Microphone signal input pin 5: Receives the audio input signal from the headset.

[0059] Key control pin 6: Receives user operation commands.

[0060] Crystal I / O pins 7 (at least 2): Used for clock synchronization to ensure stable circuit operation.

[0061] Charging indicator control pin 8: controls the power status indicator.

[0062] Operating status pin 9: Displays the current operating mode of the device, including Bluetooth status and lifting interface.

[0063] Microphone feedback pin 10 (feedforward noise reduction reference pin and feedback noise reduction control pin, at least 2 of each): used to receive external ambient noise signals and participate in the noise reduction algorithm calculation.

[0064] Analog output differential matrix output pin 11 (at least 4): transmits the processed audio signal to the power amplifier circuit.

[0065] Microphone detection circuit:

[0066] Coupled with microphone feedback pin 10, it is responsible for capturing ambient sound information, especially background noise, as a data source for the noise reduction algorithm.

[0067] Power charging circuit:

[0068] Coupled with battery power supply pin 3 and internal function power supply pin 4, it manages the battery charging process and provides stable power support for the entire circuit.

[0069] Indicator light circuit:

[0070] Coupled with the charging indicator control pin 8 and the working status pin 9, the power status and device working mode, such as Bluetooth connection status, are displayed through LEDs.

[0071] Button circuit:

[0072] Coupled with the wake-up pin, it allows users to operate via physical buttons, such as turning the device on / off, adjusting the volume, or switching modes.

[0073] Power amplifier circuit:

[0074] Coupled with the headphone amplifier control pin and the analog output differential matrix output pin 11, it is responsible for amplifying the processed audio signal to a level suitable for driving speakers or headphones.

[0075] Headset output circuit:

[0076] Coupled with the microphone signal input pin 5, it processes the audio signal from the headset to ensure clear voice communication quality.

[0077] Preferred technical solutions and their working principles

[0078] Extended pin design:

[0079] Working principle: Several expansion pins are added to the main control chip to accommodate future functional expansion needs, such as external sensors or other auxiliary devices.

[0080] Digital Signal Processor (DSP) Configuration:

[0081] Working principle: The main control chip has a built-in digital signal processor and a dedicated audio processing system, capable of performing functions such as adaptive filtering, echo cancellation, and AI intelligent noise reduction. This allows the circuit to dynamically adjust the noise reduction effect, providing the best audio experience according to different usage scenarios.

[0082] Multi-pin design optimization:

[0083] At least two of each of the power amplifier output pin 2, internal function power supply pin 4, and crystal oscillator I / O pin 7 are provided to ensure redundant design and improve system reliability and stability.

[0084] The analog output differential matrix output pin 11 has at least four pins: to support more complex audio processing logic and improve the quality and flexibility of audio output.

[0085] Enhanced microphone feedback mechanism:

[0086] The feedforward noise reduction reference pin and the feedback noise reduction control pin each have at least two pins: one for acquiring external ambient noise data and the other for providing feedback on the noise reduction effect. The dual-channel input improves noise reduction accuracy and response speed.

[0087] Multifunctional operating status indicator:

[0088] The operating status pin 9 also includes Bluetooth status and the lift interface: it not only indicates the basic operating status, but also displays more detailed connection information and the status of other advanced functions, making it easier for users to understand the specific status of the device.

[0089] Detailed Workflow

[0090] External noise signal acquisition: The headphones have multiple built-in microphones (including feedforward and feedback microphones) distributed in different locations to capture external noise from all directions. These microphones convert the noise into electrical signals and transmit them to the main control chip for processing.

[0091] Signal Processing and Analysis: The digital signal processor on the main control chip is responsible for receiving the noise signal collected by the microphone and performing spectral analysis on it. Using an adaptive filtering algorithm, the digital signal processor can identify the intensity and phase information of different frequency components, thereby preparing to generate the corresponding inverted waveform.

[0092] Inverse interference generation: Based on the analysis results, the digital signal processor generates one or more anti-sound wave signals that are out of phase and have the same amplitude as the external noise. This step is crucial for active noise reduction (ANC), which reduces noise by creating a new waveform that cancels out the original noise waveform.

[0093] Noise cancellation: The generated anti-sound wave signal is amplified by the power amplifier circuit and then transmitted to the headphone speaker through the headset output circuit. When the anti-sound wave meets the external noise at the ear, they cancel each other out, making the sound heard by the user purer.

[0094] Optimized audio output: The processed audio signal is ultimately transmitted to the user's ears through the headset output circuit, ensuring that the user receives high-quality sound that has undergone noise reduction. This process also applies to phone calls, ensuring that both parties can enjoy clear, interference-free voice communication.

[0095] Hybrid Active Noise Cancellation (HNC): This combines the advantages of both feedforward and feedback methods, using two microphones located on the outside and inside of the earphone respectively to capture ambient noise more comprehensively and improve noise cancellation. The feedforward microphone is mainly used to collect external ambient noise, while the feedback microphone focuses on the sound inside the earphone. Together, they enable the ANC algorithm to respond to changing noise environments faster and more accurately.

[0096] Adaptive Active Noise Cancellation (ANC): This feature adjusts noise cancellation strategies based on environmental awareness, automatically adapting to different noise scenarios to provide the best noise cancellation experience. For example, it enhances noise cancellation in noisy environments and reduces it in quiet environments to save power. Furthermore, Adaptive ANC can improve sound quality, extend battery life, and prevent sound leakage.

[0097] Multi-channel differential analog signal input: It has at least 4 differential analog signal input pins 1, which support the simultaneous input of multiple audio signals, improving the system's flexibility and adaptability, and is especially suitable for applications that require high resolution or multi-channel audio.

[0098] Dual power amplifier output pin 2: The design has two power amplifier output pins 2, which ensures that the system can still operate normally even if one pin fails, thus enhancing the stability and reliability of the system.

[0099] Expandability and compatibility: The main control chip also has several expansion pins, allowing for the addition of new functions or interconnection with other devices in the future, increasing the product's lifespan and market competitiveness.

[0100] In summary, the intelligent noise reduction circuit provided by this utility model achieves efficient noise suppression through a carefully designed hardware architecture and powerful software algorithms, while also providing a rich user experience and flexible functional expansion capabilities.

[0101] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit capable of intelligent noise reduction, characterized in that, The system includes a main control chip, a microphone detection circuit, a power charging circuit, an indicator light circuit, a button circuit, a power amplifier circuit, and a headset output circuit. The main control chip has several pins, including a differential analog signal input pin (1), a power amplifier output pin (2), a battery power supply pin (3), an internal function power supply pin (4), a call microphone signal input pin (5), a button control pin (6), a crystal oscillator I / O pin (7), a charging indicator light control pin (8), a working status pin (9), a microphone feedback pin (10), and an analog output differential matrix output pin (11). The microphone detection circuit and the microphone... The feedback pin (10) is coupled, the power charging circuit is coupled to the battery power supply pin (3) and the internal function power supply pin (4), the headset output circuit is coupled to the call microphone signal input pin (5), the indicator light circuit is coupled to the charging indicator light control pin (8) and the working status pin (9), the differential analog signal input pin (1) has at least 4 pins, and the differential analog signal input pin (1) includes a wake-up pin and a headphone amplifier control pin. The wake-up pin is coupled to the button circuit, the headphone amplifier control pin is coupled to the amplifier circuit, and the analog output differential matrix output pin (11) is coupled to the amplifier circuit.

2. The intelligent noise reduction circuit according to claim 1, characterized in that, The power amplifier output pin (2), the internal function power supply pin (4), and the crystal oscillator I / O pin (7) are each provided with at least two.

3. The intelligent noise reduction circuit according to claim 2, characterized in that, The working status pin (9) also includes Bluetooth status and lifting interface.

4. The intelligent noise reduction circuit according to claim 3, characterized in that, The microphone feedback pin (10) includes a feedforward noise reduction reference pin and a feedback noise reduction control pin, and each of them has at least two pins.

5. The intelligent noise reduction circuit according to claim 4, characterized in that, The analog output differential matrix output pin (11) has at least four pins.

6. The intelligent noise reduction circuit according to claim 5, characterized in that, The main control chip has several expansion pins.

7. The intelligent noise reduction circuit according to claim 6, characterized in that, The main control chip is equipped with a digital signal processor, which in turn has an audio processing system. The audio processing system is used for adaptive filtering, echo cancellation, and AI intelligent noise reduction.

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