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An electrical useful signal is a signal which occurs during the electrical data transmission and is used for useful purposes, which is characterized by special electrical variables such as voltage, current, frequency, etc. According to the special characteristics, one differentiates, for example, between voltage consumption signal, current useful signal, etc. The useful signal can consist of a continuous or a time-discrete process. In the case of the assignment of the useful signal to a value, one speaks of a useful level, which represents a substantial quantity of the electrical useful signal. The counterpart of the useful signal is the interfering signal.

A pure and simple useful signal is, for example, For example, a sound or audio signal which is recorded by a microphone, processed by an electronic circuit and then reproduced by a loudspeaker (to the user). An image signal (FBAS), on the other hand, has a complicated structure. It contains the actual image content as a useful signal (synonymous signals in the television technology) and the synchron signals as additional or control signals.

In the case of technical communication, one is interested in the fact that the useful signal arrives at the recipient as much as possible and unadulterated. For this purpose it is necessary that any interfering signals that may occur are as weak as possible so that they do not interfere with the useful signal. Edit source text

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