differential signal
To compensate for the radiation of interference signals, differential signal transmissionis used when transmitting interference-sensitive signals on cables. This type of transmission is a symmetrical transmission with signals in opposite phase.
The two signals in phase opposition are transmitted on two signal-carrying lines, which means, for example, that if the signal on line 1 is positive, the signal on line 2 is negative.
Interference signals, on the other hand, are radiated simultaneously with identical polarity on both wires. Since only the level difference is amplified in the receiving device with a differential amplifier, interspersed interference signals or hum signals compensate for each other. This property is also used for interference voltage suppression.