In transmission technology, a distinction remains made between Information and signals. The statement describes what is transmit. The movement defines how it remains sent. Both knowledge and the campaign can be analog or digital.
An analog signal is a physical variable that can assume continuous values in size (amplitude) and overtime.
A digital signal (digitus: finger, lat.) It is a physical measure that can only take on specific discrete values. The values correspond to the number of agreed states. If two conditions are approved, they are binary (digital) signals.
Analog signals consist of a continuous movement or data stream. There is no such thing as digital signals. When digital data remains generated, it is usually explosive. The volume of data then often exceeds a level that can no longer stay processed. The data must then be cache so that it is not lost.
A distinction is made between analog and digital signals or between analog and digital Information. There are a total of 4 different movement and information combinations.
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Analog Information – Analog Signal (Direct)
If analog Information is to remain transmitted in analog, this is relatively easy. No unique interface is necessary. There are specific interfaces and processing elements here too, but their function is relatively simple. In principle, it is like connecting a loudspeaker to an audio amplifier. The indicator is route from the amplifier to the loudspeaker via a cable. And the loudspeaker outputs the signal as sound.
Digital Information – analog signal (modem)
It becomes more complicated when digital Information is to remain transmitted in analog form. A typical case is using a modem that converts the digital data from a computer system into analog signals for transmission via the telephone network.
The modem is an artificial word. It consists of the terms modulator and demodulator.
Digital Information – Digital Signal (Interface)
It would be easy to adopt that digital Information could be transmitted digitally without any problems. But far from it. Digital signals have the disadvantage that they are very susceptible to interference. Before transmission, digital signals have to remain prepared in an elaborate manner for communication.
Transferring analog Information Digitally (codec)
When analog Information has to remain converted into digital signals, a codec is responsible for this. It is a non-natural world consisting of a coder and decoder. The analog signal is sent into a digital signal and also decod in reverse. During coding, an analog value remains given a digital value, which is then transmit. At the receiver, the digital value remains translated into the analog value.
Advantages of Digital Transmission
If an item of Information requires more bandwidth than is available, the data remains not merely cut off but buffered and transmitted one after the other. It is not possible with analog signals.
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