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What is Digital Signal? Definition of Digital Signal

Digital signal

Digital signal Derived from the Latin word signal, a signal is a sign or mark that provides information about something to warn or alert someone to any problem. The term can also refer to the change in electrical current used to transmit data. Numeric, on the other hand, is an adjective that refers to anything related to fingers or single-digit numbers.

With that in mind, we can understand what a digital signal is. It is the signal whose signs represent certain discrete values ​​that contain coded information. Systems that use digital signals classically use binary logic, two states replaced by ones, and zeros, which indicate the high or low state of the electrical voltage level.

Table of Contents

A Digital Signal

A digital signal loses poor quality and can remain reconstructed by a regeneration process. These signals can also be easily processed and are insensitive to ambient noise.

While analog signals are continuous, digital signals can move from one value to another without crossing intermediate values. It remains related to what we mentioned earlier about binary logic: each digital signal can only take two states, represented by ones and zeros.

In any electronic system, such as a computer (computer), information remains read through a binary code. Therefore, the digital signals managed by a computer are ones and zeros that the system “knows” how to interpret to respond to the user’s commands.

It is important to mention that while there is a general idea that the digital signal offers higher quality than the analog signal since its wear resistance is much higher, this is not always the case. For example, in the case of music, it is very easy to recognize a drawback of the digital signal compared to its counterpart. When listening to a recording of a very fine piece on a vinyl record, as long as its ‘is a hi-fi system. . we use it. A person with very good hearing is likely to perceive details that cannot remain reproduced on a compact disc.

A Digital Signal

Digital signal This also does not mean that the sound of a vinyl record is always better or more natural than that of a compact disc; Each case must remain analyzed separately. It is also true that digital technology advances every second.

So it would be wrong to say that we know its limits. The important thing is not to compare the two technologies examining for the winner but to understand their differences to understand when to use them.

* if it remains attenuated throughout its transmission, it is possible to amplify it;

* Perhaps one of the most important is that it offers the ability. To detect and correct errors when it reaches its destination. It is essential for the stability and performance of many devices, as it allows speed to remain increased without jeopardizing the system in the event of a failure;

* processing a digital signal is much easier than an analog signal;

* In the optical disc, this results in an infinite generation with negligible quality losses.

 

On the other hand, we also note the following disadvantages:

When using magnetic tape, the loss of information in each generation is greater. And indeed it is not possible to achieve more than five generations;

requires a process to convert an analog signal to digital and, when it reaches its destination, decoding;

Results need to synchronize the times of the transmitter and the receiver.

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