音响设备根据使用要求进行设计，选择要使用的设备，将这些单独的设备按照设计要求进行连接和配置。对于固定安装系统，设备需要安装在机柜内，所有系统连接都需要按照特定的标准和标准进行固定安装。那么音响系统信号传输时的阻抗匹配和信号传输电平有怎样的相关内容呢？
The audio equipment shall be designed according to the use requirements, the equipment to be used shall be selected, and these separate equipment shall be connected and configured according to the design requirements. For the fixed installation system, the equipment needs to be installed in the cabinet, and all system connections need to be fixed installed according to specific standards and standards. So what is the correlation between impedance matching and signal transmission level of sound system signal transmission?
1.阻抗匹配。
1. impedance matching.
信号输入端口是信号输出端口上的负载，需要满足的阻抗匹配程度通常取决于信号输出器件的设计要求。为了优化音频信号的传输状态，信号输入接口的阻抗需要满足信号源输出接口与负载的阻抗匹配要求。否则会影响音响设备的工作状态，输出信号会失真。
The signal input port is the load on the signal output port, and the impedance matching degree to be met usually depends on the design requirements of the signal output device. In order to optimize the transmission state of audio signal, the impedance of signal input interface needs to meet the impedance matching requirements of signal source output interface and load. Otherwise, the working state of the audio equipment will be affected and the output signal will be distorted.
严重时有损坏声源设备的风险。理论上，当输出阻抗等于负载阻抗时，信号传输效率高。输出阻抗大于负载阻抗，大部分信号功率损失在信号输出电路中，显然不利于信号传输。
There is a risk of damaging the sound source equipment in serious cases. Theoretically, when the output impedance is equal to the load impedance, the signal transmission efficiency is high. The output impedance is greater than the load impedance, and most of the signal power loss is in the signal output circuit, which is obviously not conducive to signal transmission.
因此，音频设备通常设计为输入阻抗大于输出阻抗。一般来说，如果负载阻抗大于信号输出的阻抗，音频设备的连接就会正常工作。但是，音频设备的输入阻抗不能设计得太高或太低。过高会降低馈线性能，过低会降低频率指标。
Therefore, audio equipment is usually designed with input impedance greater than output impedance. Generally speaking, if the load impedance is greater than the impedance of the signal output, the connection of the audio equipment will work normally. However, the input impedance of audio equipment should not be designed too high or too low. Too high will reduce the feeder performance, and too low will reduce the frequency index.
2.信号传输电平。
2. signal transmission level.
山东音响设备连接的目的是传输信号。音频信号传输良好的条件是信号源的输出电平需要大于输入接口的灵敏度，否则信噪比指标会变差。音频设备上的线路输入和输出电路的增益通常很平衡。换句话说，设备在输出过程中不会放大或衰减输入或输出信号电平并保持电平值。主要检查液位控制装置的调整。
The purpose of Shandong professional audio equipment connection is to transmit signals. A good condition for audio signal transmission is that the output level of the signal source needs to be greater than the sensitivity of the input interface, otherwise the signal-to-noise ratio index will become worse. The gain of line input and output circuits on audio equipment is usually balanced. In other words, the device will not amplify or attenuate the input or output signal level and maintain the level value during the output process. Mainly check the adjustment of liquid level control device.
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