A microphone noise reduction circuit and a conference microphone

Abstract

A microphone noise reduction circuit and a conference microphone are disclosed. The noise reduction circuit includes a decoding unit, a DSP unit, and a microphone array. The output terminal of the decoding unit is connected to a first terminal of the DSP unit, and the microphone array is connected to a second terminal of the DSP unit. The microphone array is used to collect audio data, the DSP unit is used to reduce noise in the audio data and output the noise-reduced audio signal, and the decoding unit is used to decode or encode the noise-reduced call audio signal. This embodiment of the invention, by combining a microphone array, a DSP unit, and a decoding unit, effectively reduces background noise and echo interference, improves the clarity and recognition accuracy of the audio signal, and significantly improves the audio processing quality.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, specifically to a microphone noise reduction circuit and a conference microphone. Background Technology

[0002] With the development of information technology, microphones have become an indispensable input component in various devices, widely used in fields such as communication, entertainment, security, and medical care. In voice assistants, smart speakers, and voice control systems, microphones play a crucial role as the first step in information collection.

[0003] However, traditional single-microphone systems often struggle to effectively handle ambient noise, echoes, wind noise, and other background distractions, severely impacting the microphone's audio acquisition quality and preventing speech recognition systems from accurately capturing user commands or performing clear audio processing. This shortcoming is particularly pronounced in scenarios such as phone calls, speech recognition, and conferencing systems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing microphones in effectively dealing with environmental noise, echoes, wind noise, and other background noise. On one hand, it provides a microphone noise reduction circuit, including a decoding unit, a DSP unit, and a microphone array. The output terminal of the decoding unit is connected to a first terminal of the DSP unit, and the microphone array is connected to a second terminal of the DSP unit, wherein:

[0005] The microphone array is used to collect audio data, the DSP unit is used to reduce the noise of the audio data and output the noise-reduced audio signal, and the decoding unit is used to decode or encode the noise-reduced call audio signal.

[0006] Furthermore, it also includes a storage unit connected to the third terminal of the DSP unit.

[0007] Furthermore, it also includes a voltage regulator unit, which is connected to the fourth terminal of the DSP unit.

[0008] Furthermore, it also includes a Type-C interface, the output of which is connected to the input of the decoding unit.

[0009] Furthermore, the microphone array includes a speaking microphone, a feedforward microphone, and a feedback microphone. The speaking microphone is used to pick up sound signals from the speaker, the feedforward microphone is used to collect ambient noise, and the feedback microphone is used to eliminate or suppress echoes.

[0010] Furthermore, the speaking microphone, feedforward microphone, and feedback microphone are condenser microphones.

[0011] Furthermore, the DSP unit also includes a bias voltage output port, which is connected to the bias voltage input ports of the speaking microphone, the feedforward microphone, and the feedback microphone, respectively.

[0012] On the other hand, this utility model also provides a conference microphone, including the microphone noise reduction circuit described above.

[0013] This embodiment of the invention effectively reduces background noise and echo interference by combining a microphone array, a DSP unit, and a decoding unit, thereby improving the clarity and recognition accuracy of audio signals. The microphone array captures audio data from multiple directions, the DSP unit performs noise reduction processing, and the decoding unit decodes or encodes the noise-reduced signal to ensure efficient processing of the audio signal. This embodiment is suitable for applications such as speech recognition and voice communication in noisy environments, significantly improving the quality of audio processing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a circuit block diagram of a preferred embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the specific circuit structure of the decoding unit and Type-C interface of this utility model;

[0017] Figure 3 This is a schematic diagram of the specific circuit structure of the DSP unit of this utility model;

[0018] Figure 4 This is a schematic diagram of the specific circuit structure of the microphone array of this utility model;

[0019] Figure 5 This is a schematic diagram of the specific circuit structure of the storage unit of this utility model;

[0020] Figure 6 This is a schematic diagram of the specific circuit structure of the voltage regulator unit of this utility model.

[0021] Figure label:

[0022] 100. Decoding unit; 200. DSP unit; 300. Microphone array; 400. Storage unit; 500. Voltage regulator unit; 600. Type-C interface. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Reference Figure 1-6 This utility model provides a microphone noise reduction circuit, including a decoding unit 100, a DSP unit 200, and a microphone array 300. The output terminal of the decoding unit 100 is connected to the first terminal of the DSP unit 200, and the microphone array 300 is connected to the second terminal of the DSP unit 200, wherein:

[0028] The microphone array 300 is used to collect audio data, the DSP unit 200 is used to reduce the noise of the audio data and output the noise-reduced audio signal, and the decoding unit 100 is used to decode or encode the noise-reduced audio signal.

[0029] This embodiment of the invention effectively reduces background noise and echo interference, and improves the clarity and recognition accuracy of audio signals by combining a microphone array 300, a DSP unit 200, and a decoding unit 100. The microphone array 300 captures audio data from multiple directions, the DSP unit 200 performs noise reduction processing, and the decoding unit 100 decodes or encodes the noise-reduced signal, ensuring efficient processing of the audio signal. This embodiment is suitable for applications such as speech recognition and voice communication in noisy environments, significantly improving audio processing quality.

[0030] In one embodiment, a storage unit 400 is further included, which is connected to the third terminal of the DSP unit 200. The storage unit 400 is used to store audio data or audio signals or programs after noise reduction processing.

[0031] In one embodiment, a voltage regulator unit 500 is also included. The voltage regulator unit 500 is connected to the fourth terminal of the DSP unit 200. The voltage regulator unit 500 stabilizes the voltage to ensure that the DSP unit 200 operates normally under stable power conditions and avoids the impact of voltage fluctuations on circuit performance.

[0032] It should be noted that the first and third terminals of the DSP unit 200 are bidirectional ports, the second terminal is a unidirectional output port, and the fourth terminal of the DSP unit 200 is a power input terminal.

[0033] The first terminal is mainly used to connect to the output terminal of the decoding unit 100 and receive the audio signal output by the decoding unit 100; the second terminal is mainly used to connect to the microphone array 300 and receive the audio data from the microphone array 300; the third terminal is mainly used to receive data from the storage unit 400, or to write the processed data to the storage unit 400 for subsequent use or backup; the fourth terminal is used to connect to the voltage regulator unit 500 to ensure a stable power supply to the DSP unit 200.

[0034] In one embodiment, a Type-C interface 600 is also included, the output of which is connected to the input of the decoding unit 100. The Type-C interface 600 supports high-bandwidth transmission to ensure that audio data is transmitted to the decoding unit 100 quickly and accurately.

[0035] Furthermore, the microphone array 300 in this embodiment consists of three types of microphones: a speaking microphone, feedforward microphones FF_L and FF_R, and feedback microphones FB_L and FB_R. The speaking microphone is mainly used to pick up the sound signal from the speaker, ensuring the clarity and accuracy of the voice input; the feedforward microphones FF_L and FF_R are used to collect ambient noise, especially in noisy environments, and can capture background noise. This noise data is then sent to the DSP unit 200 for noise reduction processing; the feedback microphones FB_L and FB_R are used to detect, eliminate, or suppress echo, ensuring that the voice quality is not affected by the sound feedback from the speaker during voice communication. Through the coordinated work of these three microphones, the microphone array 300 can efficiently separate the target sound from the ambient noise, thereby providing clear and accurate audio data for subsequent audio processing.

[0036] By combining a speaking microphone, feedforward microphones FF_L and FF_R, and feedback microphones FB_L and FB_R, this embodiment effectively improves the quality of the audio signal, reduces environmental noise and echo interference, and enables the microphone array 300 to accurately identify the target sound in complex noisy environments, significantly improving the accuracy of speech recognition and the clarity of voice communication.

[0037] In one embodiment, the speaking microphone, feedforward microphones FF_L, FF_R, and feedback microphones FB_L, FB_R are condenser microphones, which can provide high sensitivity and high sound quality audio acquisition. At the same time, condenser microphones have a stronger ability to capture subtle sounds, which helps to improve the clarity and accuracy of the speech signal and enhance the noise reduction effect.

[0038] Furthermore, in this embodiment, the DSP unit 200 also includes a bias voltage output port, which is connected to the bias voltage input ports of the speaking microphone, the feedforward microphones FF_L, FF_R and the feedback microphones FB_L, FB_R respectively. The condenser microphone requires a stable bias voltage from the outside to ensure its normal operation. The bias voltage provides the necessary voltage for the condenser microphone so that it can effectively convert sound waves into electrical signals.

[0039] By connecting the bias voltage output port to the bias voltage input port of each microphone, the DSP unit 200 can uniformly manage and provide a stable bias voltage, ensuring the performance consistency of each microphone during operation and avoiding audio signal distortion or abnormal acquisition caused by voltage instability. In this embodiment, the bias voltage output port provided by the DSP unit 200 can ensure that all microphones obtain a stable operating voltage, thereby improving the stability and performance of condenser microphones, simplifying the circuit structure, reducing the demand for external power supply, and improving the overall system reliability and audio processing quality.

[0040] The working principle of this embodiment is described in detail below:

[0041] The microphone noise reduction circuit includes a microphone array 300, a DSP unit 200, and a decoding unit 100. The microphone array 300 consists of a speaking microphone, feedforward microphones FF_L and FF_R, and feedback microphones FB_L and FB_R. The speaking microphone is used to pick up the sound signal from the speaker, the feedforward microphones FF_L and FF_R are used to collect ambient noise, and the feedback microphones FB_L and FB_R are used to detect and eliminate echo. The microphone noise reduction circuit can be used for active noise cancellation (ANC) and call noise reduction; the signal processing flow differs in different modes.

[0042] In ANC mode, the feedforward microphones FF_L and FF_R collect ambient noise, and the feedback microphones FB_L and FB_R detect residual noise. The collected audio signals are then transmitted to the second end of the DSP unit 200. The DSP unit 200 analyzes the received ambient noise signals in real time and generates inverted sound waves to cancel out the noise, thereby reducing the ambient noise heard by the user. The processed audio signal is then output through a speaker, allowing the user to have a quieter listening experience in noisy environments. In ANC mode, the audio processing of the DSP unit 200 is limited to local processing and does not involve the decoding unit 100.

[0043] In call noise reduction mode, the microphone picks up the voice signal from the speaker and transmits it to the second end of the DSP unit 200. The DSP unit 200 performs noise reduction processing on the received voice signal, including removing background noise and enhancing human voice to improve call clarity. The processed noise-reduced audio signal is output to the decoding unit 100 through the first end of the DSP unit 200. The decoding unit 100 encodes or decodes the noise-reduced audio signal for further transmission to external devices, such as mobile phones or computers. In call noise reduction mode, the processing goal of the DSP unit 200 is to optimize call quality so that the other party can hear the user's voice clearly.

[0044] In addition, to ensure the stable operation of the condenser microphones, the DSP unit 200 provides a bias voltage output port to uniformly provide the required bias voltages for the speaking microphone, feedforward microphones FF_L and FF_R, and feedback microphones FB_L and FB_R. The DSP unit 200 ensures a stable power supply to the system through the voltage regulator unit 500 to avoid the impact of voltage fluctuations on circuit performance. The Type-C interface 600 is used for the input and output of external audio signals, which can transmit external audio signals to the decoding unit 100, or transmit the audio signals output by the decoding unit 100 to external devices for audio transmission and data interaction.

[0045] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A microphone noise reduction circuit, characterized in that, The system includes a decoding unit (100), a DSP unit (200), and a microphone array (300). The output of the decoding unit (100) is connected to a first terminal of the DSP unit (200), and the microphone array (300) is connected to a second terminal of the DSP unit (200). The microphone array (300) is used to collect audio data, the DSP unit (200) is used to reduce the noise of the audio data and output the noise-reduced audio signal, and the decoding unit (100) is used to decode or encode the noise-reduced call audio signal.

2. The microphone noise reduction circuit according to claim 1, characterized in that, It also includes a storage unit (400) connected to the third end of the DSP unit (200).

3. The microphone noise reduction circuit according to claim 1, characterized in that, It also includes a voltage regulator unit (500) connected to the fourth terminal of the DSP unit (200).

4. The microphone noise reduction circuit according to claim 1, characterized in that, It also includes a Type-C interface, the output of which is connected to the input of the decoding unit (100).

5. The microphone noise reduction circuit according to any one of claims 1-4, characterized in that, The microphone array (300) includes a speaking microphone, a feedforward microphone, and a feedback microphone. The speaking microphone is used to pick up sound signals from the speaker, the feedforward microphone is used to collect ambient noise, and the feedback microphone is used to eliminate or suppress echoes.

6. The microphone noise reduction circuit according to claim 5, characterized in that, The speaking microphone, feedforward microphone, and feedback microphone are condenser microphones.

7. The microphone noise reduction circuit according to claim 6, characterized in that, The DSP unit (200) also includes a bias voltage output port, which is connected to the bias voltage input ports of the speaking microphone, the feedforward microphone and the feedback microphone, respectively.

8. A conference microphone, characterized in that, Includes the microphone noise reduction circuit as described in any one of claims 1-7.

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