Automobile noise reduction structure and noise reduction method

文档序号：1906531 发布日期：2021-11-30 浏览：20次中文

阅读说明：本技术 一种汽车降噪结构及降噪方法 (Automobile noise reduction structure and noise reduction method ) 是由陈文新康良军郭奕君于 2021-09-10 设计创作，主要内容包括：本发明涉及整车主动降噪领域,尤其涉及一种汽车降噪结构及降噪方法,包括汽车车身,所述汽车车身的车轮位置上均固定有震动传感器,所述汽车车身外部设置有四个车外麦克风,所述汽车车身内部固定有多个车内麦克风,四个所述车外麦克风串联后与汽车主机相连,四个所述震动传感器串联后也与汽车主机相连,所述车内麦克风均与功放相连。只需要两根线,可以串联车外麦克风和震动传感器,线束少、接线简单、检修便利、有效降低车重；可以降低造车成本,提升乘车感受。(The invention relates to the field of active noise reduction of a whole automobile, in particular to an automobile noise reduction structure and a noise reduction method. Only two wires are needed, the microphone outside the vehicle and the vibration sensor can be connected in series, the wire harness is few, the wiring is simple, the overhaul is convenient, and the vehicle weight is effectively reduced; the vehicle manufacturing cost can be reduced, and the riding experience is improved.)

1. The utility model provides a structure of making an uproar falls in car, includes automobile body, its characterized in that: the automobile body is characterized in that vibration sensors are fixed on the positions of wheels of the automobile body, four external microphones are arranged outside the automobile body, a plurality of internal microphones are fixed inside the automobile body, the four external microphones are connected in series and then connected with an automobile host, the four vibration sensors are also connected with the automobile host after being connected in series, and the internal microphones are all connected with a power amplifier;

the noise reduction method adopted by the automobile noise reduction structure comprises the following steps:

the method comprises the following steps: collecting wind noise data outside the vehicle through a microphone outside the vehicle, and collecting tire vibration and acceleration data through a vibration sensor;

step two: coding calculation processing is carried out on the acquired data to obtain a corresponding time period waveform;

step three: detecting whether the processed audio data contains a voice part or not based on the time interval waveform;

a. intercepting a target wave band in a nearby time period in real time according to a preset length;

b. adding all wave crests and wave troughs in the target wave band, and calculating an average value;

c. if the average value is larger than a preset sound threshold value, judging that the audio data comprises a voice part;

d. if the average value is lower than a preset sound threshold value, judging that the audio data contains a noise part;

step four: if the audio data does not contain the voice part, generating a noise model based on the audio data, playing reverse sound waves through a power amplifier in real time to counteract noise, and reducing the volume of the noise heard by human ears in the vehicle;

step five: when voice is detected to be contained in the audio data, noise reduction and coding processing are carried out on mixed audio containing the voice and the noise based on a noise model, the audio and the noise after noise reduction are obtained, the noise part is played through a power amplifier in real time to counteract the noise, and the noise volume heard by human ears in the automobile is reduced;

step six: and detecting the noise reduction effect in the vehicle by using the microphone in the vehicle, and dynamically adjusting the noise reduction calculation in real time, thereby further optimizing the noise reduction effect.

2. The automotive noise reduction structure according to claim 1, characterized in that: the external microphones are respectively arranged at the front, the back, the left and the right of the automobile body.

3. The automotive noise reduction structure according to claim 1, characterized in that: and the in-vehicle microphone is connected with the power amplifier after being connected in series.

4. The automotive noise reduction structure according to claim 1, characterized in that: the microphone all is connected with the concentrator HUB in the car, the concentrator HUB is connected with the power amplifier.

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of active noise reduction of a whole automobile, in particular to an automobile noise reduction structure and a noise reduction method.

[ background of the invention ]

Along with the change of the earth climate, the automobile industry of various countries begins to turn fuel into new energy, the noise sources in the fuel automobile comprise tire noise, wind noise and engine noise, the noise sources in the new energy automobile reduce the engine noise, and the high-end automobile is usually equipped with an active noise reduction function, and the working principle is as follows: noise signals received by a microphone arranged in a specific area in a vehicle cabin and the revolution information of an engine can be input into a vehicle-mounted power amplifier, and the power amplifier can make a vehicle-mounted loudspeaker send a waveform which is opposite to the second harmonic noise of the engine by using a unique algorithm in the power amplifier. Due to the interference effect of the waves, the sound waves of two opposite-phase waveforms can be mutually offset when meeting in the air, so that the second harmonic noise level in the cabin is greatly reduced. And the microphone arranged in the vehicle can continuously monitor and measure the noise transmitted to the cabin by the power system, and regulate and control the waveform and amplitude of the reverse wave emitted by the loudspeaker in real time, so that passengers in the vehicle get rid of the noise interference during the running of the vehicle.

The existing noise reduction arrangement method for the whole vehicle has the following defects: each node (microphone and sensor) is connected to the host machine through two independent wires, the wires are complicated, and the vehicle weight is increased; easy to damage and difficult to maintain;

the invention is provided for overcoming the defects of the prior art.

[ summary of the invention ]

The invention aims to overcome the defects of the prior art and provides an automobile noise reduction structure and a noise reduction method.

The invention can be realized by the following technical scheme:

the invention discloses an automobile noise reduction structure and a noise reduction method, which comprises an automobile body, wherein vibration sensors are fixed on the positions of wheels of the automobile body, four external microphones are arranged outside the automobile body, a plurality of internal microphones are fixed inside the automobile body, the four external microphones are connected in series and then connected with an automobile host, the four vibration sensors are also connected with the automobile host after being connected in series, and the internal microphones are connected with a power amplifier;

the noise reduction method adopted by the automobile noise reduction structure comprises the following steps:

step two: coding calculation processing is carried out on the acquired data to obtain a corresponding time period waveform;

step three: detecting whether the processed audio data contains a voice part or not based on the time interval waveform;

a. intercepting a target wave band in a nearby time period in real time according to a preset length;

b. adding all wave crests and wave troughs in the target wave band, and calculating an average value;

c. if the average value is larger than a preset sound threshold value, judging that the audio data comprises a voice part;

d. if the average value is lower than a preset sound threshold value, judging that the audio data contains a noise part;

Preferably, the external microphones are respectively arranged at the front, rear, left and right directions of the automobile body.

Preferably, the in-vehicle microphone is connected with the power amplifier after being connected in series.

Preferably, the microphones in the vehicle are all connected with a HUB, and the HUB is connected with a power amplifier.

Compared with the prior art, the invention has the following advantages:

only two wires are needed, the microphone outside the vehicle and the vibration sensor can be connected in series, the wire harness is few, the wiring is simple, the overhaul is convenient, and the vehicle weight is effectively reduced; the vehicle manufacturing cost can be reduced, and the riding experience is improved.

[ description of the drawings ]

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 3 is a time-interval waveform of the present invention;

FIG. 4 is a noise reduction waveform;

in fig. 1 and 2: 1. an exterior microphone; 2. a shock sensor; 3. an in-vehicle microphone; 4. a host; 5. amplifying power;

in fig. 3: 1. a speech waveform; 2. a noise waveform; 3. wave crest; 4. a trough of a wave;

in fig. 4: 1. a noise waveform; 2. a reverse waveform;

[ detailed description ] embodiments

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:

the first embodiment is as follows:

as shown in fig. 1, 3 and 4, the invention discloses an automobile noise reduction structure and a noise reduction method, comprising an automobile body, wherein the wheel positions of the automobile body are all fixed with vibration sensors 2, four external microphones 1 are arranged outside the automobile body, a plurality of internal microphones 3 are fixed inside the automobile body, the four external microphones 1 are connected in series and then connected with an automobile host 4, the four vibration sensors 2 are also connected with the automobile host 4 after being connected in series, and the internal microphones 3 are all connected with a power amplifier 5;

the noise reduction method adopted by the automobile noise reduction structure comprises the following steps:

the method comprises the following steps: the method comprises the following steps of collecting wind noise data outside a vehicle through a microphone 1 outside the vehicle, and collecting tire vibration and acceleration data through a vibration sensor 2;

step two: coding calculation processing is carried out on the acquired data to obtain a corresponding time period waveform;

step three: detecting whether the processed audio data contains a voice part or not based on the time interval waveform;

1. intercepting a target wave band in a nearby time period in real time according to a preset length;

2. adding all peaks and troughs in the target band and calculating an average value, see fig. 3;

3. if the average value is greater than a preset sound threshold, determining that the audio data contains a voice part, as shown in waveform 1 in fig. 3;

4. if the average value is lower than a preset sound threshold value, determining that the audio data contains a noise part, as shown in a waveform 2 in fig. 3;

step four: if the audio data does not contain the voice part, a noise model is generated based on the audio data, and the power amplifier 5 plays the inverse sound wave to counteract the noise in real time, so that the volume of the noise heard by human ears in the automobile is reduced;

step five: when voice is detected to be contained in the audio data, noise reduction and coding processing are carried out on mixed audio containing the voice and the noise based on a noise model, the audio and the noise after noise reduction are obtained, the noise part is played through a power amplifier 5 in real time to counteract the noise, and the noise volume heard by human ears in the automobile is reduced;

step six: and detecting the noise reduction effect in the vehicle by using the microphone 3 in the vehicle, and dynamically adjusting the noise reduction calculation in real time to further optimize the noise reduction effect.

Wherein, the outer microphone 1 is respectively arranged at the front, the back, the left and the right of the automobile body.

Wherein, the in-vehicle microphone 3 is connected with the power amplifier 5 after being connected in series.

Example two:

as shown in fig. 2 to 4, the invention discloses an automobile noise reduction structure and a noise reduction method, comprising an automobile body, wherein vibration sensors 2 are fixed on the positions of wheels of the automobile body, four external microphones 1 are arranged outside the automobile body, a plurality of internal microphones 3 are fixed inside the automobile body, the four external microphones 1 are connected in series and then connected with an automobile host 4, the four vibration sensors 2 are also connected with the automobile host 4 after being connected in series, and the internal microphones 3 are connected with a power amplifier 5;