How to realize the balanced audio transmission function?

To achieve balanced transmission, three parallel wires are needed to achieve it, namely, the ground wire, the hot end wire, and the cold end wire. Therefore, balanced input and output connectors must have three pins, such as Canon head and large three-pin connector.

Canon male-to-female audio cable

　　
　　Unbalanced transmission has only two terminals, namely: signal terminal and ground terminal. For this kind of single-phase signal, in order to prevent common mode interference, use a coaxial cable, the outer sheath is the ground, and the middle core is the signal line. Common connectors, such as BNC connectors, RCA connectors, etc. This transmission method is usually used in occasions that require less demanding and short-distance signal transmission, such as home audio systems. This connection is also commonly used for electronic musical instruments, electric guitars and other equipment.

　　 Here is a point to remind readers: balanced signals need to be transmitted with balanced connectors. Then, on the other hand, when you see balanced connectors, such as the large three-pin TRS connector or XLR3 connector, is the signal transmitted in the circuit necessarily balanced? the answer is negative.

Canon female head to large three-core audio cable

　　
For example, when the large three-pin TRS connector is used to transmit stereo signals, the tip pin transmits the left channel signal, the Ring pin transmits the right channel signal, and the Sleep pin is grounded. Then it transmits two different signals at this time, namely Not a balanced signal. The balanced signal is essentially one signal, but after inverting it, the two channels are transmitted at the same time. In view of this, readers should be careful to distinguish in practical applications when combining the actual circuit.

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