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汽车主动降噪怎么使用 让你开车更安静


  汽车的主动降噪让我们很多的车友比较青睐,汽车的噪音是我们在日常的驾车过程中最不想遇到的,汽车主动降噪怎么使用,这是我们很多车主比较疑惑的,尤其是想要买车的车主,对于这个配置更应该要好好的了解一下。
  汽车主动降噪原理
  在汽车上,其实就是发动机所传出的噪音与音响系统发出的抑制性噪音交汇叠加后便会相互抵消达到降噪效果。不过在某些地方,汽车降噪与耳机上的降噪还是在处理方式有所不同的。因为汽车发动机在不同转速时,所发出的噪音基本是处于一个固定状态的,所以在车辆生产前,厂家一般都会提前收集好发动机的噪音数据,通过系统计算出不同转速下与噪音相反的波,从而进行噪音的抵消。
  它通过发动机转速作为参照信号,再通过车内几个消音扬声器产生相应的噪音抑制音频信号来消除噪音。而装在车顶的麦克风,是带有误差修正功能的,它可以修正噪音抑制音频信号。有了这套完善的系统后,并不需要太多的车厢降噪材料,便可获得优异的降噪效果,而这一系统也开始在一些中等价位的车型上普及开来,相信普通消费者很快便能体会到它带来的静谧效果。
  主动降噪在汽车上的应用
  1、一般是在车舱内特定区域安装的麦克风接收到的噪音信号、发动机的转数信息会输入到车载功放,而功放会利用内部独特的算法,令车载扬声器发出一个与引擎二次谐波噪音反相的波形。由于波的干涉效应,两个反相波形的声波在空中相遇时会相互抵消,从而使得车舱内二次谐波噪音水平大幅降低。而车内安装的麦克风,能持续监测、测量动力系统传导到车舱内的噪音,实时调控扬声器发出的反相波的波形和幅度,从而让车内乘客,摆脱车辆运行时的噪音困扰。
  2、主动降噪也不是将发动机的噪音全部隔绝掉,而是有选择的处理各种不合适、不悦耳的噪音,理想的发动机声音会随着发动机转速的提高而线性增加,这正是汽车制造厂商不断调校所追求的发动机声音特性目标。所以车主(尤其是有经验的老司机)也没必要担心由于听不到发动机的声音而使得自己无法判断车辆的工作状态。

The car's active noise reduction makes many of our riders more attractive. The car's noise is the most we don't want to encounter in the daily driving process. How to use the car's active noise reduction is a problem for many of our car owners, especially when we think about it. If you want to buy a car owner, you should take a good look at this configuration.
Active Noise Reduction Principle of Automobile
In the car, in fact, the noise from the engine and the suppression noise from the sound system will superimpose and cancel each other to achieve the noise reduction effect. However, in some places, car noise reduction and noise reduction in headphones are still different in the way they are handled. Because the noise emitted by the car engine at different speeds is basically in a fixed state, before the vehicle is produced, the manufacturers generally collect the noise data of the engine in advance, and calculate the waves opposite to the noise at different speeds through the system. As a result, noise cancellation is performed.
It uses the engine speed as a reference signal, and then eliminates the noise by generating noise suppression audio signals from several silencer speakers in the car. The microphone mounted on the roof is equipped with an error correction function that corrects the noise-suppressed audio signal. With this perfect system, there is no need for too many noise reduction materials in the car cabin, so the first-class noise reduction effect can be obtained. This system has also started to be popularized in some medium-price models. It is believed that ordinary consumers It will soon be able to realize the quiet effect it brings.
Active Noise Reduction in Automotive Applications
1. The noise signal received by a microphone installed in a specific area of a car cabin and the information about the number of revolutions of the engine are input to the car amplifier. The amplifier uses a unique internal algorithm to make the car speaker emit a second harmonic with the engine. Noise inversion of the waveform. Due to the interference effect of the waves, the sound waves of the two anti-phase waveforms cancel each other when they meet in the air, resulting in a drastic reduction of the second harmonic noise level in the cabin. The microphone installed in the car can continuously monitor and measure the noise transmitted from the power system to the cabin, and can control the waveform and amplitude of the anti-phase wave sent by the loudspeaker in real time, thereby allowing the passengers in the vehicle to get rid of the noise troubles when the vehicle is running.
2. Active noise reduction is not to isolate the noise of the engine, but to deal with various inappropriate and unpleasant noises. The ideal engine sound will increase linearly with the increase of the engine speed. This is exactly the car. Manufacturers continue to adjust the engine sound characteristics sought by the target. Therefore, owners (especially experienced old drivers) do not need to worry that they cannot judge the working status of the vehicle because they cannot hear the sound of the engine.
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