What is a digital signal?
Digital signal is the way of data transfer that converts data to discrete values, usually based on binary code on which computer systems work, which consists of packets of information encoded as strings and zeros. The use of digital signaling allows accurate and almost identical copying of certain types of information, such as numbers, letters, or individual pixels that make up images, and this information can be stored without long -term degradation of its quality. However, if a digital signal is converted from what is originally an analog signal, for example in music or other natural wave forms, the final result is only the approximation of the original analog signal and some quality in digital format can be lost.
, while analog signals are based on a natural process that uses forms of electromagnetic waves that are developed by digital signals, digital signals are based on digital signal. The modulator demodulator (mode) is such amanagement. It receives analog signals either from the transmission of air wool or telephone lines and converts it into digital signals that a computer or modern digital TV can display as useful information.
The transfer of analog signal has been a common form of transmission in technology since the 18th century, but since 2007 it has been estimated that more than 94% of stored and transmitted information have become digital around the world. This is only 3% for digital storage in 1993 and the reasons for transmitting digital signals are often capacity and noise. Analog signals can only be transmitted in a defined range for wavelengths, and when the signal reaches out of this range or is disturbed by other analog signals along similar wavelengths, distortion and noise can reduce the value of the signal.
Since digital signals are based on discrete princip for switching on/off, they have a much smaller Nazihylnost to corruption over long distances. The digital signal can also be divided into separate packets of information known as computer bytes and send individually to the destination where they are re -assembled. This allows much more efficient data transmission of data along randomized networks such as Internet speed, and also increases data transfer speed above all.
One of the main disadvantages, for example, the signal of the digital TV signal or the digital cable signal is that it is an artificial reproduction of the original data, while the analog signal begins as an accurate copy of the original. Because the digital signal is translated by multiple devices, encoded as analog and decoded as digital and re -assembled at the final point, the quality in reproduction can be lost. This is due to the fact that digital signals are often copies of copies of copies, and in the process the approximate approximation must be carried out by technology to replicate the original signal. Wireless digital transmissions can also be damagedAnother wireless activity in the area or radio signal, which affects them, even if it tends to be less problem than corruption of signal in air transmission.