An audio cable, referred to as an audio cable, is used to spread the sound. It consists of two parts: audio cable and connector. The audio cable is usually a double-core shielded cable. Common connectors are RCA (commonly known as Lotus head audio cable), XLR (commonly known as Canon audio cable), and TRS JACKS (commonly known as plug head). ).
It is understood that the audio line is more complicated than the video line. In addition to the above three aspects, there is also a problem of balanced and unbalanced connection.
Balanced connection
The so-called balanced connection method is a method of connecting a pair of balanced signals by using two signal lines. Since the interference levels of the two signal lines are the same, the phases are opposite, and finally the interference is cancelled. Due to the low frequency range of the audio, it is susceptible to interference under long-distance transmission. Therefore, the balanced connection is an interference-free connection method, which is most common in audio connections of professional equipment. The two-core shielded cable is also used as an audio connection cable in the connection line of the household appliance. However, it transmits the left and right channels, which are two signals and are not balanced.
Unbalanced connection
Unbalanced connection is a connection method that uses only one signal line to transmit signals. Since this connection is susceptible to interference, it is generally used only in household appliances or in some cases where the requirements are low. The specific connection takes the XLR connector as an example:
1. Balanced connection method: 1 pin connection shield, 2 pin connection end (also called hot end), 3 pin connection end (also called cold end);
2. Unbalanced connection: 1 pin and 3 pin are connected to shield, and 2 pin is connected (signal end). The choice of connection is generally based on the specific requirements of the interface of the device. You can use the balanced connection method as much as possible. When connecting, be sure to read the instructions on the panel first. It is best to read the instructions on the instruction manual and Claim. In some cases, it may be encountered that the device interface at one end is a balanced interface, and the device at the other end is an unbalanced interface. In the case where the requirements are not very strict, only the balanced connection method is used at the balanced end, and the unbalanced connection is used unbalanced. Law, pay attention to the corresponding foot can be. In the case of strict requirements, it is necessary to use a conversion circuit to turn the balance into an imbalance or to turn the imbalance into a balance.
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Label: Balance and unbalanced connection of audio lines
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