CN203547837U - Engine noise reduction controller - Google Patents
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- CN203547837U CN203547837U CN201320711398.0U CN201320711398U CN203547837U CN 203547837 U CN203547837 U CN 203547837U CN 201320711398 U CN201320711398 U CN 201320711398U CN 203547837 U CN203547837 U CN 203547837U
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Abstract
一种发动机降噪控制器包括DSP数据处理模块、与音频解码模块连接的可将反相调幅输出信号输出以抵消发动机噪音的功率放大模块和与DSP数据处理模块连接的可接收发动机转速信号的发动机转速调理模块。本实用新型通过DSP采集噪音信号,并对信号进行分析,输出与外界噪音相等的反向声波,将噪音中和,从而实现降噪的效果,此方式能降低整车质量,同时削弱对人体损害较大的低频噪声,降噪效果更好,从而实现整车的低噪声化。
An engine noise reduction controller includes a DSP data processing module, a power amplification module connected to an audio decoding module that can output an anti-phase amplitude modulation output signal to offset engine noise, and an engine connected to the DSP data processing module that can receive an engine speed signal Speed regulation module. The utility model collects the noise signal through the DSP, analyzes the signal, outputs the reverse sound wave equal to the external noise, and neutralizes the noise, so as to achieve the effect of noise reduction. This method can reduce the quality of the whole vehicle and at the same time weaken the damage to the human body. Larger low-frequency noise, better noise reduction effect, so as to realize the low noise of the whole vehicle.
Description
技术领域technical field
本实用新型属于汽车电子技术领域,具体涉及一种发动机降噪控制器。The utility model belongs to the technical field of automobile electronics, in particular to an engine noise reduction controller.
背景技术Background technique
发动机是整个噪音系统的激振源,发动机降噪技术可大致分为主动降噪和被动降噪。主动降噪是直接降低发动机噪音,被动降噪则需要尽可能提高系统的共振频率以及吸声降噪。传统的发动机噪音控制技术主要为被动降噪技术,包括吸音处理、隔音处理、使用消声器、阻尼减振等,此方式会导致汽车体积大而且降噪效果不够理想,缺少对发动机主动降噪的处理。The engine is the excitation source of the entire noise system, and the engine noise reduction technology can be roughly divided into active noise reduction and passive noise reduction. Active noise reduction is to directly reduce engine noise, while passive noise reduction needs to increase the system's resonance frequency and sound absorption and noise reduction as much as possible. The traditional engine noise control technology is mainly passive noise reduction technology, including sound absorption treatment, sound insulation treatment, use of mufflers, damping and vibration reduction, etc. This method will cause the car to be bulky and the noise reduction effect is not ideal, and there is no active noise reduction treatment for the engine. .
实用新型内容Utility model content
本实用新型的目的就是针对上述问题,提供一种发动机降噪控制器。The purpose of this utility model is to provide an engine noise reduction controller for the above problems.
本实用新型采用的技术方案是:它包括用于将发动机噪音信号输入的数据采集模块、与数据采集模块连接的音频解码模块、与音频解码模块连接的DSP数据处理模块、与音频解码模块连接的可将反相调幅输出信号输出以抵消发动机噪音的功率放大模块和与DSP数据处理模块连接的可接收发动机转速信号的发动机转速调理模块。The technical solution adopted by the utility model is: it includes a data acquisition module for inputting engine noise signals, an audio decoding module connected with the data acquisition module, a DSP data processing module connected with the audio decoding module, and a DSP data processing module connected with the audio decoding module. A power amplifying module that can output anti-phase amplitude modulation output signals to offset engine noise and an engine speed conditioning module that is connected with the DSP data processing module and can receive engine speed signals.
进一步地,所述音频解码模块为音频编解码器CODEC。Further, the audio decoding module is an audio codec CODEC.
进一步地,所述DSP数据处理模块连接有可接收发动机转速信号的发动机转速调理模块。Further, the DSP data processing module is connected with an engine speed regulation module capable of receiving engine speed signals.
进一步地,所述发动机转速调理模块包括磁电式转速传感器和调理电路。Further, the engine speed regulating module includes a magnetoelectric speed sensor and a regulating circuit.
进一步地,所述DSP数据处理模块连接有可扩展DSP数据处理模块片内容量的FLASH ROM扩展模块和SDRAM扩展模块。Further, the DSP data processing module is connected with a FLASH ROM expansion module and an SDRAM expansion module that can expand the on-chip capacity of the DSP data processing module.
进一步地,所述数据采集模块为与音频解码模块连接的左右声道的麦克风。Further, the data acquisition module is a left and right channel microphone connected to the audio decoding module.
更进一步地,所述功率放大模块包括与音频解码模块连接的D类功放和与D类功放连接的喇叭。Furthermore, the power amplifying module includes a class D power amplifier connected to the audio decoding module and a speaker connected to the class D power amplifier.
本实用新型利通过DSP采集噪音信号,并对信号进行分析,输出与外界噪音相等的反向声波,将噪音中和,从而实现降噪的效果,此方式能降低整车质量,同时消弱对人体损害较大的低频噪声,降噪效果更好,从而实现整车的低噪声化。The utility model collects the noise signal through DSP, analyzes the signal, outputs the reverse sound wave equal to the external noise, and neutralizes the noise, so as to achieve the effect of noise reduction. This method can reduce the quality of the whole vehicle and at the same time weaken the noise The low-frequency noise that damages the human body is more effective, and the noise reduction effect is better, so as to realize the low noise of the whole vehicle.
附图说明Description of drawings
图1是本实用新型结构示意图。Fig. 1 is the structural representation of the utility model.
具体实施方式Detailed ways
下面结合附图和具体实施例对本实用新型作进一步的详细说明,便于清楚地了解本实用新型,但它们不对本实用新型构成限定。The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the utility model, but they do not limit the utility model.
如图1所示,本实用新型安装在发动机进气歧管中,包括数据采集模块1、音频解码模块2、DSP数据处理模块3和功率放大模块4,数据采集模块1与音频解码模块2连接,DSP数据处理模块3与音频解码模块2连接,功率放大模块4与音频解码模块2连接。数据采集模块1为与音频解码模块连接的左右声道的麦克风。音频解码模块2为音频编解码器CODEC。DSP数据处理模块3连接有发动机转速调理模块5,发动机转速调理模块5包括磁电式转速传感器和调理电路;DSP数据处理模块3连接有可扩展DSP数据处理模块3片内容量的FLASH ROM扩展模块6和SDRAM扩展模块7。功率放大模块4包括与音频解码模块连接的D类功放4.1和与D类功放4.1连接的喇叭4.2。As shown in Figure 1, the utility model is installed in the engine intake manifold, including
数据采集模块:发动机噪音通过左右声道的讯号麦克风MIC输入,安置于发动机舱内,选择麦克风时要求其能侦测到耳朵能听见的环境中低频噪音(100~1000Hz)。Data acquisition module: The engine noise is input through the signal microphone MIC of the left and right channels, and it is installed in the engine compartment. When selecting a microphone, it is required that it can detect low-frequency noise (100-1000Hz) in the environment that can be heard by the ear.
DSP数据处理模块:能够采集1.5KHZ频率以下的噪声且采样频率大于等于16KHZ。此模块功用为采集数据,对控制算法进行集成处理,实现实时运算以对噪声进行控制。由于DSP自带的片内容量不够用,此模块还包括FLASH ROM扩展模块和SDRAM扩展模块。DSP data processing module: It can collect noise below 1.5KHZ frequency and the sampling frequency is greater than or equal to 16KHZ. The function of this module is to collect data, integrate and process the control algorithm, and realize real-time operation to control the noise. Since the on-chip capacity of DSP is not enough, this module also includes FLASH ROM expansion module and SDRAM expansion module.
音频编解码模块:此模块可选用低功耗、立体声音频编解码器CODEC。由麦克风输入的差分左右声道的噪音信号通过音频解码器处理后,通过DSP数据处理模块处理之后再将信号输入到功率放大模块进行进一步处理。Audio codec module: This module can choose CODEC, a low-power, stereo audio codec. The noise signals of the differential left and right channels input by the microphone are processed by the audio decoder, processed by the DSP data processing module, and then the signal is input to the power amplification module for further processing.
功率放大模块:使用D类功放作为此控制器中功率放大模块的核心,可把音频编解码模块输出的信号进行功率放大,最终得到与噪音相位相反、振幅相同的立体声,再利用喇叭将此声音发射出去以抵消原有噪音。Power amplifying module: use Class D power amplifier as the core of the power amplifying module in this controller, which can amplify the signal output by the audio codec module, and finally obtain a stereo sound with the opposite phase and the same amplitude as the noise, and then use the speaker to amplify the sound Emitted to cancel out the original noise.
发动机转速调理模块:发动机转速调理模块由磁电式转速传感器和调理电路组成,调理电路对磁电式转速传感器输出的正弦波转速信号进行过零比较,经调理电路处理后得到方波信号,DSP数据处理模块则直接采集此数字信号。Engine speed conditioning module: The engine speed conditioning module is composed of a magnetoelectric speed sensor and a conditioning circuit. The conditioning circuit compares the sine wave speed signal output by the magnetoelectric speed sensor across zero, and obtains a square wave signal after being processed by the conditioning circuit. DSP The data processing module directly collects the digital signal.
本实用新型的工作原理:发动机噪音信号通过左右声道的讯号麦克风MIC输入,此讯号通过音频解码模块处理后作为要消除的目标信号输入至DSP数据处理模块;与此同时DSP数据处理模块收到发动机转速信号后,计算此转速下的半阶次噪音频率作为主动消声系统的参考信号,由麦克风采集至DSP数据处理模块的信号作为要消除的目标信号,设计一自适应过滤器,对输入参考信号的每一个样值,按特定的算法,更新、调整加权系数,使过滤器的输出与目标信号相比较的均方误差最小,由此得到的过滤器的输出作为最终的反向调幅信号再经音频解码模块和D类功放驱动喇叭输出,从而抵消发动机噪音。The working principle of the utility model: the engine noise signal is input through the signal microphone MIC of the left and right channels, and after the signal is processed by the audio decoding module, it is input to the DSP data processing module as the target signal to be eliminated; at the same time, the DSP data processing module receives After the engine speed signal, the half-order noise frequency at this speed is calculated as the reference signal of the active noise reduction system, and the signal collected by the microphone to the DSP data processing module is used as the target signal to be eliminated, and an adaptive filter is designed to input For each sample value of the reference signal, update and adjust the weighting coefficient according to a specific algorithm, so that the mean square error between the output of the filter and the target signal is minimized, and the output of the filter thus obtained is used as the final reverse amplitude modulation signal Then the speaker output is driven by the audio decoding module and the class D power amplifier to offset the engine noise.
本说明书未作详细描述的内容属于本领域专业技术人员公知的现有技术。The content not described in detail in this specification belongs to the prior art known to those skilled in the art.
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CN103557043A (en) * | 2013-11-11 | 2014-02-05 | 东风汽车公司 | Engine noise reduction controller |
CN111306614A (en) * | 2020-03-03 | 2020-06-19 | 青岛海尔空调器有限总公司 | Active noise reduction air conditioner and control method thereof |
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CN103557043A (en) * | 2013-11-11 | 2014-02-05 | 东风汽车公司 | Engine noise reduction controller |
CN111306614A (en) * | 2020-03-03 | 2020-06-19 | 青岛海尔空调器有限总公司 | Active noise reduction air conditioner and control method thereof |
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