In view of technological advances, television has used different systems to meet the ever-increasing demand of viewers worldwide. Similarly, television has been evolving and has gone from the analog system to the digital system. In this sense, in this article we will present the differences that exist between these two systems, starting from their concepts.
Analog television is one whose transmissions and reproductions are carried out through electronic pulses and is not encoded in binary or digital form. In analog television, the image and sound parameters are represented by the magnitudes of electrical signals and their way of reaching viewers is through radio waves that travel through the air in VHF and UHF bands (very high frequency and ultra high frequency).
Analog signals are spread and transmitted using curved waves and can only be read by devices capable of interpreting analog signals. Therefore, they are more suitable for audio and video transmission and because of this, television has made use of them for a long time, that is, analog transmission has been the standard signal technology since the invention of television.
This system is transmitted through a modulation system of hertzian waves which occupy a large bandwidth, also known as channel width, equivalent to hundreds of simultaneous telephone calls.
Digital television is one that is produced and transmitted through digital signals, that is, binary code systems where each bit is a representation of two different amplitudes. This system provides a greater capacity to transmit information, due to the fact that it has less possibility of being affected by noise, therefore, the transmission of information is carried out in an excellent way.
The diffusion of digital television began in 1980 with the digitization of television production that gave way to the digitization of transmission based on the DVB (Digital Video Broadcasting) system, which is an organization that promotes television standards. digital and have three large areas depending on the form of it even when they are similar in terms of technology. This is through satellite, cable and via terrestrial radio frequency, also known as DTT (Digital Terrestrial Television).
Therefore, digital television (Digital TV) is a form of signal technology that has allowed television stations to provide much clearer images and better sound quality, therefore it is more efficient and more flexible than traditional technology. of the signal (analog). Similarly, the digitization of television signals allows, among other benefits, the transmission of several programs simultaneously through a multi-transmission system.
Taking into account the above, it can be said that the basic differences between analog television and digital television are:
- Analog television was the system used for the production and transmission of the television signal since its inception, while digital television began in 1980 with the digitization of television production, which gave way to the digitization of signal transmission. .
- Analog television is based on the VHF and UHF (very high frequency and ultra high frequency) systems while digital television is based on the DVB (Digital Video Broadcasting) system.
- In analog television, the image and sound parameters are represented by the magnitudes of electrical signals, while in digital television these parameters are represented in bits using the binary system, where the voltages represent zeros and ones (0 and 1).