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A method and system for active noise reduction applied to automobiles

A technology for noise reduction systems and automobiles, applied in instruments, sensor parts, sensors, etc., to solve problems such as offsetting or attenuating noise, discounting noise reduction effects, and enhancing noise, so as to reduce noise levels and improve noise reduction effects.

Active Publication Date: 2021-04-13
GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in practice, it is found that due to the propagation characteristics of sound waves such as reflection and diffraction, when the anti-phase signal and noise are superimposed in a certain area, the phase of the anti-phase signal may have changed, so that it cannot be canceled or attenuated in this area noise
So active noise cancellation in current car audio systems can reduce noise in one area of ​​the car, but may also boost noise in other areas of the car
Once the head of the passenger leaves the area where the current noise reduction effect is good, the noise reduction effect will be greatly reduced

Method used

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  • A method and system for active noise reduction applied to automobiles
  • A method and system for active noise reduction applied to automobiles
  • A method and system for active noise reduction applied to automobiles

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Experimental program
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Embodiment 1

[0079] see figure 1 , figure 1 It is a schematic flowchart of an active noise reduction method applied to automobiles disclosed in an embodiment of the present invention, and the method is applicable to active noise reduction systems with active noise reduction functions such as vehicle infotainment systems and car audio systems. Such as figure 1 As shown, the active noise reduction method applied to automobiles may include the following steps:

[0080] 101. The MCU controls the face recognition and positioning module to recognize the location of the user's ear on the seat of the car.

[0081] In the embodiment of the present invention, when a passenger gets into the car, the MCU controls the face recognition positioning module to perform face recognition on the passenger to identify the orientation of the human ear. Wherein, the above-mentioned human ears include left and right ears.

[0082] As an optional implementation, the above-mentioned face recognition and position...

Embodiment 2

[0100] see figure 2 , figure 2 It is a schematic flowchart of another active noise reduction method applied to automobiles disclosed by the embodiment of the present invention. Such as figure 2 As shown, the active noise reduction method applied to automobiles may include the following steps:

[0101] 201. The MCU controls the camera to capture a facial image including the face of the user on the seat of the car, and recognizes the orientation of the user's ear according to the facial image.

[0102] In the embodiment of the present invention, the face recognition positioning module may specifically be a camera installed in the car, and locate the orientation of the human ear through the visual information collected by the camera.

[0103] 202. The MCU controls the noise sampling microphone to collect the first noise signal in the car.

[0104] 203. The MCU controls the rotation of the speaker until the sound outlet of the speaker faces the direction of the human ear. ...

Embodiment 3

[0125] see Figure 4 , Figure 4 It is a structural schematic diagram of an active noise reduction system applied to automobiles disclosed by an embodiment of the present invention. Such as Figure 4 As shown, the active noise reduction system applied to automobiles may include:

[0126] The identification and positioning module 401 is used to identify the ear position of the user on the car seat;

[0127] In the embodiment of the present invention, the identification and positioning module 401 can specifically locate the orientation of the human ear according to the facial image captured by the camera; or, can transmit ultrasonic waves through the ultrasonic transceiver, and locate the orientation of the human ear by analyzing the corresponding reflected waves.

[0128] The noise sampling microphone module 402 is used to control the noise sampling microphone to collect the first noise signal in the car.

[0129]In the embodiment of the present invention, the noise samplin...

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Abstract

An active noise reduction method and system applied to automobiles, the method comprising: identifying the ear orientation of a user on a seat of the automobile; controlling a noise sampling microphone to collect a first noise signal in the automobile; controlling The loudspeaker rotates until the sound outlet of the loudspeaker faces the direction of the human ear; a first noise reduction signal is generated according to the first noise signal, and the phase of the first noise signal is opposite to that of the first noise reduction signal; The speaker plays the first noise reduction signal. By implementing the embodiment of the present invention, the posture of the speaker can be adjusted in real time according to the orientation of the human ear of the user on the seat, so that when the speaker plays the noise reduction audio signal, its sound outlet keeps facing the orientation of the human ear, so that the area near the human ear can always be maintained Good noise reduction effect, further reduce the noise level in the car, and improve the noise reduction effect of the active noise reduction system.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to an active noise reduction method and system applied to automobiles. Background technique [0002] Active noise cancellation, also known as active noise cancellation (Active Noise Cancellation, ANC) is a noise reduction technology. Its working principle is to generate an anti-phase sound wave equal to the external noise through the noise reduction system, thereby neutralizing the external noise and realizing Noise reduction effect. [0003] At present, some car audio systems have the function of active noise reduction. These systems obtain data such as the speed of the car engine and the addition and subtraction of the accelerator pedal from the bus of the car's Controller Area Network (CAN) as noise reduction reference signals, and then according to the The obtained reference signal for noise reduction generates a signal in antiphase with the noise, and the antiphase si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/178H04R3/00
CPCG10K11/178H04R3/00
Inventor 于豪齐晗
Owner GUANGZHOU XIAOPENG MOTORS TECH CO LTD