为什么汽车音响会有噪音？ Why does the car audio system have noise?

为什么汽车音响会有噪音？ 从本底噪声开始介绍汽车音响有噪声的原因，信噪比的概念和为什么提高信噪比可以提高音质。最后介绍了如何快速的用耳朵和工具碟判断我们自己的汽车音响底噪水平。Why does the car audio system have noise? Starting from the background noise, introduce the reasons for the noise in the car audio system, the concept of signal-to-noise ratio and why improving the signal-to-noise ratio can enhance the sound quality. Finally, introduce how to quickly judge the background noise level of our own car audio system with ears and tool discs.