Automatic frequency conversion matching circuit based on environmental noise

Abstract

The utility model relates to the technical field of interphone noise reduction, in particular to an automatic frequency conversion matching circuit based on environmental noise, which comprises an audio input module, an audio conversion module and an audio noise reduction module which are sequentially in communication connection. The audio input module is used for collecting environment sound and transmitting a sound signal to the audio conversion module; the audio conversion module is used for converting a sound analog signal into a sound digital signal and transmitting the sound digital signal to the audio noise reduction module; the audio noise reduction module is used for carrying out noise reduction processing on the sound digital signal; and the audio noise reduction module comprises an IG1202 noise reduction chip. According to the utility model, the definition of communication sound of the interphone can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of intercom noise reduction, in particular to an automatic frequency conversion matching circuit based on environmental noise. Background Art

[0002] Digital Mobile Radio (DMR) is a professional wireless communication device used for voice and data transmission. DMR digital walkie-talkies have the characteristics of excellent voice quality, high spectrum efficiency and strong anti-interference ability. They can be widely used in public security, commercial enterprises and institutions, logistics industry, tourism industry and construction industry. With the continuous development of wireless communication technology, DMR digital walkie-talkies will provide more convenient and efficient communication for all walks of life.

[0003] Environmental noise will have a direct impact on the communication quality of the walkie-talkie. The DMR digital walkie-talkie uses a digital voice encoding and decoding algorithm to make the voice quality clearer and more fidelity, while being able to suppress noise and interference, thereby improving the call quality of the walkie-talkie.

[0004] Regarding the above-mentioned related technologies, the applicant believes that in the related technologies, when the ambient noise intensity is high, the DMR digital walkie-talkie has limited effect in suppressing the ambient noise, which can easily lead to a low signal-to-noise ratio of the signal received by the other party's walkie-talkie, and thus cause the sound output by the other party's walkie-talkie to be unclear. Utility Model Content

[0005] The utility model aims to provide an automatic frequency conversion matching circuit based on environmental noise to solve the problem that the communication sound of an intercom is not clear enough when the intensity of the environmental noise is high.

[0006] The utility model is realized by the following technical solutions:

[0007] An automatic frequency conversion matching circuit based on environmental noise includes an audio input module, an audio conversion module and an audio noise reduction module which are sequentially connected in communication;

[0008] The audio input module is used to collect environmental sounds and transmit sound signals to the audio conversion module;

[0009] The audio conversion module is used to convert the sound analog signal into a sound digital signal and transmit it to the audio noise reduction module;

[0010] The audio noise reduction module is used to perform noise reduction processing on the sound digital signal;

[0011] The audio noise reduction module includes an IG1202 noise reduction chip.

[0012] Furthermore, the audio input module includes a microphone.

[0013] Furthermore, the audio conversion module includes a NAU88C22 audio sound card chip.

[0014] Furthermore, it also includes an active noise reduction module, which includes a noise sensor, a noise processor and an inverted speaker that are communicatively connected in sequence; the noise sensor is used to detect environmental noise, the noise processor is used to process the noise signal according to its characteristics and generate an inverted sound wave signal opposite to the noise, and the inverted speaker is used to convert the inverted sound wave signal into sound waves.

[0015] Furthermore, it also includes a main control chip, a power detection module and a power supply module which are communicatively connected in sequence, and the noise sensor and the noise processor are both electrically connected to the main control chip.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] 1. Install the circuit in the intercom. The audio input module collects human voices and noise in the environment and transmits various sound signals to the audio conversion module. The audio conversion module converts the sound analog signal into a sound digital signal and transmits it to the audio noise reduction module for noise reduction processing. The sound digital signal after noise reduction processing is then transmitted back to the audio conversion module. The audio conversion module then transmits the sound signal to the other party's intercom through the intercom communication module. Since the sound signal has been processed by noise reduction, it can effectively suppress and eliminate the noise in the sound signal, thereby increasing the signal-to-noise ratio of the sound emitted by the speaker of the other party's intercom, so that people can hear more clearly during intercom calls;

[0018] 2. The noise in the environment can be collected by the noise sensor and transmitted to the noise processor. The noise processor can process the noise signal according to its characteristics and generate an anti-phase sound wave signal opposite to the noise. The anti-phase speaker converts the anti-phase sound wave signal into a sound wave and emits it, so that the anti-phase sound wave and the noise are offset, thereby achieving active noise reduction;

[0019] 3. The power detection module is used to monitor the power status of the power module of the circuit in real time. The power module is used to provide power for the entire circuit. When it is detected that the power of the power module is low, the main control chip triggers the power saving mode; when the noise detected by the noise sensor is small, the main control chip disconnects the power supply of the noise processor, that is, the noise processor does not perform noise processing, does not generate an inverted sound wave signal, and the inverted speaker does not emit sound waves, which is beneficial to saving power; when the noise detected by the noise sensor is large, the noise processor cooperates with the inverted speaker to actively reduce the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model.

[0021] In the attached picture:

[0022] Figure 1 This is a schematic diagram of the structure of the matching circuit of Example 1 of the utility model.

[0023] Marks and corresponding parts names in the attached drawings:

[0024] 1. Audio input module; 2. Audio conversion module; 3. Audio noise reduction module; 4. Intercom communication module; 5. Noise sensor; 6. Noise processor; 7. Inverting speaker; 8. Main control chip; 9. Power detection module; 10. Power supply module. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with the embodiments and drawings. The schematic implementation mode and description of the utility model are only used to explain the utility model and are not intended to limit the utility model. It should be noted that the utility model is already in the actual development and use stage.

[0026] Example 1

[0027] An automatic frequency conversion matching circuit based on environmental noise, referring to Figure 1 , including an audio input module 1, an audio conversion module 2 and an audio noise reduction module 3 which are sequentially connected in communication; the audio conversion module 2 is connected in communication with an intercom communication module 4;

[0028] The audio input module 1 is used to collect environmental sounds and transmit the sound signals to the audio conversion module 2;

[0029] The audio conversion module 2 is used to convert the sound analog signal into a sound digital signal and transmit it to the audio noise reduction module 3;

[0030] The audio noise reduction module 3 is used to perform noise reduction processing on the sound digital signal; the audio noise reduction module 3 includes the IG1202 noise reduction chip, which is a high-performance, low-power voice processing SOC chip that can effectively eliminate environmental noise;

[0031] The intercom communication module 4 is used to send and receive the sound signal after the noise reduction process, and the intercom communication module 4 includes a wireless transceiver module.

[0032] The circuit is installed in an intercom, the audio input module 1 collects human voices and noise in the environment and transmits various sound signals to the audio conversion module 2, the audio conversion module 2 converts the sound analog signal into a sound digital signal and transmits it to the audio noise reduction module 3 for noise reduction processing, the sound digital signal after noise reduction processing is then transmitted back to the audio conversion module 2, and the audio conversion module 2 transmits the sound signal to the other party's intercom through the intercom communication module 4. Since the sound signal has been processed by noise reduction, the noise in the sound signal can be effectively suppressed and eliminated, thereby increasing the signal-to-noise ratio of the sound emitted by the speaker of the other party's intercom, so that people can hear more clearly during intercom calls.

[0033] As a preferred embodiment, refer to Figure 1 The audio conversion module 2 includes the NAU88C22 audio sound card chip. The NAU88C22 is an audio sound card chip with ADC and DAC, which is convenient for converting sound signals between analog signals and digital signals.

[0034] As a preferred embodiment, refer to Figure 1 , the matching circuit also includes an active noise reduction module, which includes a noise sensor 5, a noise processor 6 and an inverted speaker 7 that are sequentially connected in communication; the noise sensor 5 is used to detect environmental noise, the noise processor 6 is used to process the noise signal according to the characteristics of the noise signal and generate an inverted sound wave signal opposite to the noise, and the inverted speaker 7 is used to convert the inverted sound wave signal into a sound wave; the noise sensor 5 can collect noise in the environment and transmit the noise to the noise processor 6, the noise processor 6 can process the noise signal according to the characteristics of the noise signal and generate an inverted sound wave signal with the same frequency and opposite phase (180° difference) as the noise, and the inverted speaker 7 converts the inverted sound wave signal into a sound wave and emits it, so that the inverted sound wave and the noise are offset, thereby achieving active noise reduction; the active noise reduction module can generate and emit inverted sound waves of different frequencies according to the different frequencies of the environmental noise, which is conducive to offsetting the noise sound wave and changing the output spectrum of the sound signal. Therefore, the circuit of this example can be called an automatic frequency conversion matching circuit.

[0035] As a preferred embodiment, refer to Figure 1The matching circuit also includes a main control chip 8, a power detection module 9 and a power module 10 which are sequentially connected in communication. The noise sensor 5 and the noise processor 6 are electrically connected to the main control chip 8. The power module 10 is used to provide power for the audio input module 1, the audio conversion module 2, the audio noise reduction module 3, the power detection module 9 and the main control chip 8; the power detection module 9 can monitor the power status of the power module 10 of the circuit in real time, and the power module 10 is used to provide power for the entire circuit. When the power detection module 9 detects that the power of the power module 10 is low, the main control chip 8 triggers the power saving mode; when the noise detected by the noise sensor 5 is small, the main control chip 8 disconnects the power supply of the noise processor 6, that is, the noise processor 6 does not perform noise processing, does not generate an inverted sound wave signal, and the inverted speaker 7 does not emit a sound wave, which is conducive to saving power; when the noise detected by the noise sensor 5 is large, the noise processor 6 cooperates with the inverted speaker 7 to perform active noise reduction processing on the noise, that is, in order to improve the communication quality, the active noise reduction program will be enforced.

[0036] As a preferred embodiment, refer to Figure 1 The audio input module 1 includes a microphone. Multiple microphones and noise sensors 5 can be set. Each microphone receives ambient sound in a different direction, and a noise sensor 5 is set in the corresponding direction of each microphone. The main control chip 8 can compare the noise level in sounds from different directions according to the multiple noise sensors 5, and then select the microphone in the direction with less noise to collect sound signals, so as to reduce the input of noise and improve the communication quality.

[0037] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An automatic frequency conversion matching circuit based on environmental noise, Features: It comprises an audio input module (1), an audio conversion module (2) and an audio noise reduction module (3) which are sequentially communicatively connected; The audio input module (1) is used to collect environmental sounds and transmit sound signals to the audio conversion module (2); The audio conversion module (2) is used to convert the sound analog signal into a sound digital signal and transmit the digital signal to the audio noise reduction module (3); The audio noise reduction module (3) is used to perform noise reduction processing on the sound digital signal; The audio noise reduction module (3) comprises an IG1202 noise reduction chip.

2. The automatic frequency conversion matching circuit based on environmental noise according to claim 1, Features: The audio input module (1) comprises a microphone.

3. The automatic frequency conversion matching circuit based on environmental noise according to claim 1, Features: The audio conversion module (2) comprises a NAU88C22 audio sound card chip.

4. The automatic frequency conversion matching circuit based on environmental noise according to claim 1, Features: The invention also comprises an active noise reduction module, wherein the active noise reduction module comprises a noise sensor (5), a noise processor (6) and an inverted phase speaker (7) which are communicatively connected in sequence; the noise sensor (5) is used to detect environmental noise, the noise processor (6) is used to process the noise signal according to its characteristics and generate an inverted phase sound wave signal which is opposite to the noise, and the inverted phase speaker (7) is used to convert the inverted phase sound wave signal into a sound wave.

5. The automatic frequency conversion matching circuit based on environmental noise according to claim 4, Features: It also includes a main control chip (8), a power detection module (9) and a power supply module (10) which are communicatively connected in sequence, and the noise sensor (5) and the noise processor (6) are both electrically connected to the main control chip (8).

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