CN115278467B - Sound field restoration method and device and automobile - Google Patents
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Abstract
Description
技术领域Technical field
本发明涉及声学技术领域，特别是涉及一种声场还原方法、装置及汽车。The present invention relates to the field of acoustic technology, and in particular to a sound field restoration method, device and automobile.
背景技术Background technique
目前的声场还原技术都采用单一方法，如波束形成方法或声全息方法，不可避免的带来单一方法固有的缺陷，如波束形成技术在低频近场场景下定位效果较差，而声全息技术在高频远场场景下分辨率不足等。而在工程应用中，需要还原的声场可能既包含低频近场场景也包含高频远场场景，因此常规的声场还原技术在复杂场景下的适用性较差。Current sound field restoration technologies all use a single method, such as beam forming method or acoustic holography method, which inevitably brings inherent defects of a single method. For example, beam forming technology has poor positioning effect in low-frequency near-field scenarios, while acoustic holography technology has poor positioning effect in low-frequency near-field scenarios. Insufficient resolution in high-frequency far-field scenarios, etc. In engineering applications, the sound field that needs to be restored may include both low-frequency near-field scenes and high-frequency far-field scenes. Therefore, conventional sound field restoration technology has poor applicability in complex scenes.
现有的基于波束形成算法的声场还原方法存在低频分辨率差，近场识别效果差的缺陷，而采用声全息方法的声场还原技术则存在高频分辨率低，远场识别效果差的缺陷。通常这两种技术方法只能在某些特性场景下适用，具有较大应用局限性。The existing sound field restoration method based on the beamforming algorithm has the defects of poor low-frequency resolution and poor near-field recognition effect, while the sound field restoration technology using the acoustic holographic method has the defects of low high-frequency resolution and poor far-field recognition effect. Usually these two technical methods can only be applied in certain characteristic scenarios and have great application limitations.
发明内容Contents of the invention
本发明的目的在于，提出一种声场还原方法、装置及汽车，解决现有方法低频或高频分辨率差，近场或远场识别效果差，导致只能在特性场景下适用、应用局限性大的技术问题。The purpose of the present invention is to propose a sound field restoration method, device and car to solve the problem that the existing method has poor low-frequency or high-frequency resolution and poor near-field or far-field recognition effect, which results in that it can only be applied in specific scenarios and has application limitations. Big technical problem.
一方面，提供一种声场还原方法，包括以下步骤：On the one hand, a sound field restoration method is provided, including the following steps:
步骤S1，获取还原声场内多个测量点的声压信号；Step S1, obtain the sound pressure signals of multiple measurement points in the restored sound field;
步骤S2，将多个测量点的声压信号输入预设的声全息计算模型，获得低频近场的还原数据；将多个测量点的声压信号输入预设的波束形成计算模型，获得高频远场的还原数据；并分别对所述低频近场的还原数据和所述高频远场的还原数据进行归一处理，获得低频近场的声场还原信号和高频远场的声场还原信号；Step S2: Input the sound pressure signals of multiple measurement points into the preset acoustic holographic calculation model to obtain the restored data of the low-frequency near field; input the sound pressure signals of the multiple measurement points into the preset beam forming calculation model to obtain the high-frequency far field The restoration data; and perform normalization processing on the restoration data of the low-frequency near field and the restoration data of the high-frequency far field, respectively, to obtain the sound field restoration signal of the low-frequency near field and the sound field restoration signal of the high-frequency far field;
其中，将声场还原信号的频率不高于分析频率上限1/2的声压信号定义为低频信号；将声场还原信号的频率不低于分析频率上限1/2的声压信号定义为高频信号；将声场还原信号的还原点与任意测量点距离不超过信号采集阵列相距最远传感器距离3倍的声压信号定义为近场信号；将声场还原信号的还原点与任意测量点距离不小于信号采集阵列相距最远传感器距离3倍的声压信号定义为远场信号；Among them, the sound pressure signal whose frequency of the sound field restoration signal is not higher than 1/2 of the upper limit of the analysis frequency is defined as a low-frequency signal; the sound pressure signal whose frequency of the sound field restoration signal is not lower than 1/2 of the upper limit of the analysis frequency is defined as a high-frequency signal. ; Define the sound pressure signal whose distance between the restoration point of the sound field restoration signal and any measurement point no more than 3 times the distance of the farthest sensor from the signal collection array as a near-field signal; define the distance between the restoration point of the sound field restoration signal and any measurement point not less than the signal The sound pressure signal collected from the farthest sensor array that is three times the distance from the sensor is defined as the far-field signal;
步骤S3，对多个测量点的声压信号进行混叠加权计算，获得低频远场的声场还原信号、高频近场的声场还原信号；Step S3: Perform a mixing and weighting calculation on the sound pressure signals of multiple measurement points to obtain a sound field restoration signal in the low-frequency far field and a sound field restoration signal in the high-frequency near field;
其中，将多个测量点的声压信号输入预设的声全息计算模型，获得低频远场的声场声压、高频近场的声场声压；将多个测量点的声压信号输入预设的波束形成计算模型，获得低频远场的声场分布信号、高频近场的声场分布信号；Among them, the sound pressure signals of multiple measurement points are input into the preset acoustic holographic calculation model to obtain the low-frequency far-field sound field sound pressure and the high-frequency near-field sound field sound pressure; the sound pressure signals of multiple measurement points are input into the preset The beamforming calculation model is used to obtain the sound field distribution signal in the low-frequency far field and the sound field distribution signal in the high-frequency near field;
对低频远场的声场声压、低频远场的声场分布信号进行归一处理并加权，获得低频远场的声场还原信号；The sound field sound pressure of the low-frequency far field and the sound field distribution signal of the low-frequency far field are normalized and weighted to obtain the sound field restoration signal of the low-frequency far field;
对高频近场的声场声压、高频近场的声场分布信号进行归一处理并加权，获得高频近场的声场还原信号；Normalize and weight the sound field sound pressure of the high-frequency near field and the sound field distribution signal of the high-frequency near field to obtain the sound field restoration signal of the high-frequency near field;
步骤S4，将低频近场的声场还原信号、高频远场的声场还原信号、低频远场的声场还原信号、高频近场的声场还原信号进行合成，获得声场还原结果。Step S4: synthesize the sound field restoration signal of the low-frequency near field, the sound field restoration signal of the high-frequency far field, the sound field restoration signal of the low-frequency far field, and the sound field restoration signal of the high-frequency near field to obtain the sound field restoration result.
优选地，所述步骤S2还包括：Preferably, the step S2 also includes:
将属于低频信号且属于近场信号的声场还原信号归类为低频近场的声压信号；将属于低频信号且属于远场信号的声场还原信号归类为低频远场的声压信号；将属于高频信号且属于近场信号的声场还原信号归类为高频近场的声压信号；将属于高频信号且属于远场信号的声场还原信号归类为高频远场的声压信号。The sound field restoration signal that is a low-frequency signal and a near-field signal is classified as a low-frequency near-field sound pressure signal; the sound field restoration signal that is a low-frequency signal and a far-field signal is classified as a low-frequency far-field sound pressure signal; The sound field restoration signal that is a high-frequency signal and is a near-field signal is classified as a high-frequency near-field sound pressure signal; the sound field restoration signal that is a high-frequency signal and is a far-field signal is classified as a high-frequency far-field sound pressure signal.
优选地，在步骤S2中，根据以下公式对所述低频近场的还原数据进行归一处理：Preferably, in step S2, the restored data of the low-frequency near field is normalized according to the following formula:
其中，Pnl表示低频近场的声场还原信号；表示低频近场的还原数据；||·||表示二范数。Among them, P nl represents the sound field restoration signal of low-frequency near field; represents the restored data of the low-frequency near field; ||·|| represents the second norm.
优选地，在步骤S2中，根据以下公式对所述高频远场的还原数据进行归一处理：Preferably, in step S2, the restored data of the high-frequency far field is normalized according to the following formula:
其中，Pfh表示高频远场的声场还原信号；表示高频远场的还原数据；||·||表示二范数。Among them, P fh represents the sound field restoration signal of the high-frequency far field; represents the restored data of the high-frequency far field; ||·|| represents the second norm.
优选地，在步骤S3中，根据以下公式对低频远场的声场声压、低频远场的声场分布信号进行归一处理并加权：Preferably, in step S3, the sound field sound pressure of the low-frequency far field and the sound field distribution signal of the low-frequency far field are normalized and weighted according to the following formula:
其中，||·||表示二范数；α表示加权系数，其取值范围为α∈(0.2,0.8)；表示低频远场的声场声压；/>表示低频远场的声场分布信号；Pfl表示低频远场的声场还原信号。Among them, ||·|| represents the second norm; α represents the weighting coefficient, and its value range is α∈(0.2,0.8); Represents the sound field sound pressure of the low-frequency far field;/> Represents the sound field distribution signal of the low-frequency far field; P fl represents the sound field restoration signal of the low-frequency far field.
优选地，在步骤S3中，根据以下公式对高频近场的声场声压、高频近场的声场分布信号进行归一处理并加权：Preferably, in step S3, the sound field sound pressure of the high-frequency near field and the sound field distribution signal of the high-frequency near field are normalized and weighted according to the following formula:
其中，||·||表示二范数；α表示加权系数，其取值范围为α∈(0.2,0.8)；表示高频近场的声场声压；/>表示高频近场的声场分布信号；Pnh表示高频近场的声场还原信号。Among them, ||·|| represents the second norm; α represents the weighting coefficient, and its value range is α∈(0.2,0.8); Indicates the sound field sound pressure of high-frequency near field;/> Represents the sound field distribution signal of high-frequency near field; P nh represents the sound field restoration signal of high-frequency near field.
优选地，在步骤S4中，根据以下公式进行合成，获得声场还原结果：Preferably, in step S4, synthesis is performed according to the following formula to obtain the sound field restoration result:
其中，Pf表示声场还原结果；Pnh表示高频近场的声场还原信号；Pfl表示低频远场的声场还原信号；Pnl表示低频近场的声场还原信号；Pfh表示高频远场的声场还原信号。Among them, P f represents the sound field restoration result; P nh represents the sound field restoration signal of high frequency near field; P fl represents the sound field restoration signal of low frequency far field; P nl represents the sound field restoration signal of low frequency near field; P fh represents the sound field of high frequency far field. Restore signal.
另一方面，还提供一种声场还原装置，通过所述的声场还原方法对车内的声场进行还原。On the other hand, a sound field restoration device is also provided, which restores the sound field in the car through the sound field restoration method.
本发明，还提供一种汽车，通过所述的声场还原装置对车内的声场进行还原。The present invention also provides a car, which uses the sound field restoration device to restore the sound field in the car.
综上，实施本发明的实施例，具有如下的有益效果：In summary, implementing the embodiments of the present invention has the following beneficial effects:
本发明提供的声场还原方法、装置及汽车，将波束形成与声全息两种算法结合，并将复杂声场自动划分为四个场景，利用波束形成算法还原高频远场声场，利用声全息算法还原近场低频声场，同时提出一种混叠加权算法还原近场高频声场和远场低频声场。经过自适应分配的声场还原算法能够大幅提升声场还原精度。能够在复杂应用场景下准确还原声场特性，具有较好的适用性和工程应用价值。The sound field restoration method, device and car provided by the present invention combine beam forming and acoustic holography algorithms, and automatically divide the complex sound field into four scenes. The beam forming algorithm is used to restore the high-frequency far field sound field, and the acoustic holography algorithm is used to restore the near field. For the low-frequency sound field, a hybrid weighting algorithm is proposed to restore the near-field high-frequency sound field and the far-field low-frequency sound field. The adaptively allocated sound field restoration algorithm can greatly improve the accuracy of sound field restoration. It can accurately restore sound field characteristics in complex application scenarios, and has good applicability and engineering application value.
附图说明Description of the drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，根据这些附图获得其他的附图仍属于本发明的范畴。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings obtained based on these drawings still fall within the scope of the present invention without exerting any creative effort.
图1为本发明实施例中一种声场还原方法的主流程示意图。Figure 1 is a schematic main flow diagram of a sound field restoration method in an embodiment of the present invention.
图2为本发明实施例中汽车车内声场还原测量示意图。Figure 2 is a schematic diagram of sound field restoration measurement in a car in an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述。In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings.
如图1所示，为本发明提供的一种声场还原方法的一个实施例的示意图。在该实施例中，所述方法包括以下步骤：As shown in Figure 1, it is a schematic diagram of an embodiment of a sound field restoration method provided by the present invention. In this embodiment, the method includes the following steps:
步骤S1，获取还原声场内多个测量点的声压信号；可以理解的是，可以通过信号采集系统获取需还原声场的声压信号其中/>表示第M个测量点处的声压。Step S1, obtain the sound pressure signals of multiple measurement points in the restored sound field; it can be understood that the sound pressure signals to be restored in the sound field can be obtained through a signal acquisition system Among them/> Indicates the sound pressure at the Mth measurement point.
步骤S2，将多个测量点的声压信号输入预设的声全息计算模型，获得低频近场的还原数据；将多个测量点的声压信号输入预设的波束形成计算模型，获得高频远场的还原数据；并分别对所述低频近场的还原数据和所述高频远场的还原数据进行归一处理，获得低频近场的声场还原信号和高频远场的声场还原信号；可以理解的是，采用声全息方法计算低频近场的还原数据其中，声全息方法包括但不限于基于傅里叶变换的平面声全息、基于等效源法的声全息和基于逆边界元法的声全息等。采用波束形成方法计算高频远场的还原数据/>其中，波束形成方法包括但不限于传统波束形成方法、反卷积波束形成方法等，具体地，将声场还原信号分为4组，即/> Step S2: Input the sound pressure signals of multiple measurement points into the preset acoustic holographic calculation model to obtain the restored data of the low-frequency near field; input the sound pressure signals of the multiple measurement points into the preset beam forming calculation model to obtain the high-frequency far field The restoration data of the low-frequency near field and the restoration data of the high-frequency far field are normalized respectively to obtain the sound field restoration signal of the low-frequency near field and the sound field restoration signal of the high-frequency far field; It can be understood that using Acoustic holography method to calculate low-frequency near-field restoration data Among them, acoustic holography methods include but are not limited to planar acoustic holography based on Fourier transform, acoustic holography based on equivalent source method, acoustic holography based on inverse boundary element method, etc. Use beamforming method to calculate restored data of high-frequency far field/> Among them, the beam forming method includes but is not limited to the traditional beam forming method, deconvolution beam forming method, etc. Specifically, the sound field restoration signal is divided into 4 groups, namely/>
分别对应低频近场、低频远场、高频近场及高频远场场景。其中，i+j+k+m＝N，N为还原点个数。 Corresponding to low-frequency near field, low-frequency far field, high-frequency near field and high-frequency far field scenarios respectively. Among them, i+j+k+m=N, N is the number of restoration points.
具体实施例中，将还原声场内多个测量点的声压信号进行归类的具体过程为：将声场还原信号的频率不高于分析频率上限1/2的声压信号定义为低频信号；声压信号的频率不低于分析频率上限1/2声压信号定义为高频信号；将声场还原信号的还原点与任意测量点距离不超过信号采集阵列相距最远传感器距离3倍的声压信号定义为近场信号；将声场还原信号的还原点与任意测量点距离不小于信号采集阵列相距最远传感器距离3倍的声压信号定义为远场信号；将属于低频信号且属于近场信号的声场还原信号归类为低频近场的声压信号；将属于低频信号且属于远场信号的声场还原信号归类为低频远场的声压信号；将属于高频信号且属于近场信号的声场还原信号归类为高频近场的声压信号；将属于高频信号且属于远场信号的声场还原信号归类为高频远场的声压信号。In a specific embodiment, the specific process of classifying the sound pressure signals of multiple measurement points in the restored sound field is as follows: defining the sound pressure signal whose frequency of the sound field restored signal is not higher than 1/2 of the upper limit of the analysis frequency as a low-frequency signal; A sound pressure signal whose frequency is not less than 1/2 of the upper limit of the analysis frequency is defined as a high-frequency signal; a sound pressure signal whose distance between the restoration point of the sound field restoration signal and any measurement point does not exceed 3 times the distance of the farthest sensor from the signal collection array is defined as a high-frequency signal. It is defined as a near-field signal; the sound pressure signal whose distance between the restoration point of the sound field restoration signal and any measurement point is not less than 3 times the distance of the farthest sensor from the signal acquisition array is defined as a far-field signal; the sound pressure signal that is a low-frequency signal and is a near-field signal is defined as a far-field signal. The sound field restoration signal is classified as a low-frequency near-field sound pressure signal; the sound field restoration signal that is a low-frequency signal and a far-field signal is classified as a low-frequency far-field sound pressure signal; the sound field restoration signal that is a high-frequency signal and is a near-field signal is classified The restored signal is classified as a high-frequency near-field sound pressure signal; the sound-field restored signal that is both a high-frequency signal and a far-field signal is classified as a high-frequency far-field sound pressure signal.
根据以下公式对所述低频近场的还原数据进行归一处理：The restored data of the low-frequency near field are normalized according to the following formula:
其中，Pnl表示低频近场的声场还原信号；表示低频近场的还原数据；||·||表示二范数。Among them, P nl represents the sound field restoration signal of low-frequency near field; represents the restored data of the low-frequency near field; ||·|| represents the second norm.
根据以下公式对所述高频远场的还原数据进行归一处理：The restored data of the high-frequency far field is normalized according to the following formula:
其中，Pfh表示高频远场的声场还原信号；表示高频远场的还原数据；||·||表示二范数。Among them, P fh represents the sound field restoration signal of the high-frequency far field; represents the restored data of the high-frequency far field; ||·|| represents the second norm.
步骤S3，对多个测量点的声压信号进行混叠加权计算，获得低频远场的声场还原信号Pfl、高频近场的声场还原信号Pnh；可以理解的是，采用混叠加权算法计算Pfl和Pnh。首先分别采用声全息方法和波束形成方法计算低频远场、高频近场还原点处的声场分布信息其中，/>和/>为采用声全息方法计算得到的声场声压，/>和/>为采用波束形成方法计算得到的声场分布信号。Step S3, perform a mixing and superposition weighting calculation on the sound pressure signals of multiple measurement points to obtain a low-frequency far-field sound field restoration signal P fl and a high-frequency near-field sound field restoration signal P nh ; it can be understood that the mixing and superposition weighting algorithm is used Calculate P fl and P nh . First, the acoustic holography method and the beam forming method are used to calculate the sound field distribution information at the low-frequency far field and high-frequency near field restoration points. Among them,/> and/> is the sound field sound pressure calculated using the acoustic holography method,/> and/> is the sound field distribution signal calculated using the beamforming method.
具体实施例中，将多个测量点的声压信号输入预设的声全息计算模型，获得低频远场的声场声压、高频近场的声场声压；将多个测量点的声压信号输入预设的波束形成计算模型，获得低频远场的声场分布信号、高频近场的声场分布信号；In a specific embodiment, the sound pressure signals of multiple measurement points are input into a preset acoustic holographic calculation model to obtain the sound field sound pressure of the low-frequency far field and the sound field sound pressure of the high-frequency near field; the sound pressure signals of the multiple measurement points are obtained Input the preset beam forming calculation model to obtain the sound field distribution signal of the low-frequency far field and the sound field distribution signal of the high-frequency near field;
对低频远场的声场声压、低频远场的声场分布信号进行归一处理并加权，获得低频远场的声场还原信号；具体地，根据以下公式对低频远场的声场声压、低频远场的声场分布信号进行归一处理并加权：The sound field sound pressure of the low-frequency far field and the sound field distribution signal of the low-frequency far field are normalized and weighted to obtain the sound field restoration signal of the low-frequency far field; specifically, the sound field sound pressure of the low-frequency far field, the sound field distribution signal of the low-frequency far field are obtained according to the following formula The sound field distribution signal is normalized and weighted:
其中，||·||表示二范数；α表示加权系数，其取值范围为α∈(0.2,0.8)，通常需要根据实际分析情况选择合适的取值；表示低频远场的声场声压；/>表示低频远场的声场分布信号；Pfl表示低频远场的声场还原信号。Among them, ||·|| represents the second norm; α represents the weighting coefficient, and its value range is α∈(0.2,0.8). It is usually necessary to select the appropriate value according to the actual analysis situation; Represents the sound field sound pressure of the low-frequency far field;/> Represents the sound field distribution signal of the low-frequency far field; P fl represents the sound field restoration signal of the low-frequency far field.
对高频近场的声场声压、高频近场的声场分布信号进行归一处理并加权，获得高频近场的声场还原信号。具体地，根据以下公式对高频近场的声场声压、高频近场的声场分布信号进行归一处理并加权：The sound field sound pressure of the high-frequency near field and the sound field distribution signal of the high-frequency near field are normalized and weighted to obtain the sound field restoration signal of the high-frequency near field. Specifically, the sound field sound pressure of high-frequency near field and the sound field distribution signal of high-frequency near field are normalized and weighted according to the following formula:
其中，||·||表示二范数；α表示加权系数，其取值范围为α∈(0.2,0.8)，通常需要根据实际分析情况选择合适的取值；表示高频近场的声场声压；/>表示高频近场的声场分布信号；Pnh表示高频近场的声场还原信号。Among them, ||·|| represents the second norm; α represents the weighting coefficient, and its value range is α∈(0.2,0.8). It is usually necessary to select the appropriate value according to the actual analysis situation; Indicates the sound field sound pressure of high-frequency near field;/> Represents the sound field distribution signal of high-frequency near field; P nh represents the sound field restoration signal of high-frequency near field.
步骤S4，将低频近场的声场还原信号、高频远场的声场还原信号、低频远场的声场还原信号、高频近场的声场还原信号进行合成，获得声场还原结果。具体地，根据以下公式进行合成，获得声场还原结果：Step S4: synthesize the sound field restoration signal of the low-frequency near field, the sound field restoration signal of the high-frequency far field, the sound field restoration signal of the low-frequency far field, and the sound field restoration signal of the high-frequency near field to obtain the sound field restoration result. Specifically, synthesis is performed according to the following formula to obtain the sound field restoration result:
其中，Pf表示声场还原结果；Pnh表示高频近场的声场还原信号；Pfl表示低频远场的声场还原信号；Pnl表示低频近场的声场还原信号；Pfh表示高频远场的声场还原信号。Among them, P f represents the sound field restoration result; P nh represents the sound field restoration signal of high frequency near field; P fl represents the sound field restoration signal of low frequency far field; P nl represents the sound field restoration signal of low frequency near field; P fh represents the sound field of high frequency far field. Restore signal.
本发明的实施例还提供一种声场还原装置，通过所述的声场还原装置方法对车内的声场进行还原。关于声场还原装置的具体实现过程，参考上述声场还原装置方法的内容，在此不再赘述。Embodiments of the present invention also provide a sound field restoration device, which restores the sound field in the car through the sound field restoration device method. Regarding the specific implementation process of the sound field restoration device, refer to the content of the sound field restoration device method mentioned above, and will not go into details here.
本发明的实施例还提供一种汽车，通过所述的声场还原装置对车内的声场进行还原。具体实现过程，参考上述声场还原装置方法的内容，在此不再赘述。An embodiment of the present invention also provides a car, which uses the sound field restoration device to restore the sound field in the car. For the specific implementation process, refer to the content of the sound field restoration device method mentioned above, and will not be described again here.
如图2所示，为车内前舱附近声场测量示意图。以车内前舱附近声场信息为目标，在进行声场还原时，图中带支架的球形阵列半径为0.1m，球面内嵌36个传声器，即球形阵列放置于副驾驶座位，传声器阵列中心点距仪表台垂直距离为0.5m。汽车车内噪声分析频率范围为0-3000Hz。取仪表台上50个点为还原点，即N＝50，其中，还原点距传声器阵列中心最远的距离为1.2m，最近的距离为0.5m。划分的四个场景如下表所示：As shown in Figure 2, it is a schematic diagram of sound field measurement near the front cabin of the car. Taking the sound field information near the front cabin of the car as the target, when performing sound field restoration, the radius of the spherical array with a bracket in the picture is 0.1m, and 36 microphones are embedded in the spherical surface, that is The spherical array is placed on the passenger seat, and the vertical distance between the center point of the microphone array and the instrument panel is 0.5m. The frequency range of car interior noise analysis is 0-3000Hz. Take 50 points on the instrument panel as restoration points, that is, N=50. Among them, the farthest distance between the restoration point and the center of the microphone array is 1.2m, and the shortest distance is 0.5m. The four divided scenarios are shown in the table below:
其中，α＝0.5。可采用上述声场还原装置方法合成声场还原结果Pf。Among them, α=0.5. The sound field restoration result P f can be synthesized using the above sound field restoration device method.
综上，实施本发明的实施例，具有如下的有益效果：In summary, implementing the embodiments of the present invention has the following beneficial effects:
本发明提供的声场还原方法、装置及汽车，将波束形成与声全息两种算法结合，并将复杂声场自动划分为四个场景，利用波束形成算法还原高频远场声场，利用声全息算法还原近场低频声场，同时提出一种混叠加权算法还原近场高频声场和远场低频声场。经过自适应分配的声场还原算法能够大幅提升声场还原精度。能够在复杂应用场景下准确还原声场特性，具有较好的适用性和工程应用价值。The sound field restoration method, device and car provided by the present invention combine beam forming and acoustic holography algorithms, automatically divide the complex sound field into four scenes, use the beam forming algorithm to restore the high-frequency far field sound field, and use the acoustic holography algorithm to restore the near field For the low-frequency sound field, a hybrid weighting algorithm is proposed to restore the near-field high-frequency sound field and the far-field low-frequency sound field. The adaptively allocated sound field restoration algorithm can greatly improve the accuracy of sound field restoration. It can accurately restore sound field characteristics in complex application scenarios, and has good applicability and engineering application value.
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。What is disclosed above is only the preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.
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