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. impedance matching.
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.
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.
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. signal transmission level.
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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