What is the difference between digital terrestrial TV and cable TV?

What is the difference between digital terrestrial TV and cable TV? At present, what we generally call TV mainly refers to three types: terrestrial (wireless) TV, cable TV, and satellite (wireless) TV.

With the development of science and technology, the emergence of digital compression technology, the current analog image through digital compression technology, in our current channel can send multiple channels of programs, greatly saving wireless frequency resources.

Cable TV is only through optical cable and 75 euro cable transmission channel, the supplementary channel (the so-called supplementary channel is some other use of the frequency is also used, because it is transmitted through the cable does not interfere with the wireless frequency) used, the current cable TV is mainly analog signal, and gradually converted to digital compression, at present, the satellite is mostly digital compression.

Digital terrestrial television (DVB-T) is the transmission of digital signals, refers to the use of digital technology to process, compress, encode signals such as live image and sound, after storage or real-time broadcasting, for users to receive, the television system. Cable TV transmits analog signals, which are not stable and will be gradually eliminated.

In the usual sense, the cable TV installed in the home does not mean satellite TV, it may be a cable that transmits an analog signal, or it may be a cable digital TV (DVB C).

1. The number of channels is different.

2. The signal requirements are different.

Ordinary cable TV has high signal requirements, otherwise the user side is easy to have a bad signal and snowflakes; The digital TV signal is good and the image is clear.

3. Different management.

Ordinary cable TV is not easy to manage, and one household pays a fee to watch it for many households. It can manage one set-top box and can only connect to one TV.

Digital TV and cable TV are two ways of broadcasting and television signal transmission, and the main differences between them are as follows:

1.Signal transmission mode:

Digital TV uses digital signals for transmission, while cable TV uses analog signals for transmission, and the digital signal transmission method is more advanced, and the signal quality and stability are better.

2.Number and quality of programs:

3.Viewing method:

Digital TV usually needs external devices such as receivers or TV boxes to receive signals, and needs to operate remote controls to select programs, which has a better user experience. Cable TV, on the other hand, only needs to be connected to a cable cable.

4.Cost: The cost of digital and cable TV will vary depending on the region, service provider, number of channels, and other factors. Generally speaking, digital TV requires the purchase of a digital receiver or TV box, while cable TV requires a subscription fee.

To sum up, digital TV and cable TV have their own advantages and disadvantages, and you need to choose according to your actual needs and budget. If you want to have a richer selection of programs and a better program experience, digital TV may be more suitable for you; If cable TV has a good signal in the area, cable TV may be more affordable and convenient.

Digital TV: The relative concept is analog TV. Cable TV: The relative concept is wireless TV. CCTV: The relative concept is open circuit television.

Digital TV: The relative concept is analog TV. It mainly refers to the transmission of TV signals, one is a digital signal and the other is an analog signal. Now the country is vigorously promoting the reform of digital television, mainly to improve the definition of TV and reduce the bandwidth occupied by the signal.

Cable TV: The relative concept is wireless TV. This is very simple,The kind that is received with an antenna is wireless TV,Plugged in a coaxial cable to receive a signal is called cable TV。 Generally speaking, cable TV can ensure the stability of the TV signal. Wu Mu.

A closed circuit is a television signal that transmits a signal over a small area, such as military, medical, and educational television signals. The simplest form of CCTV is a camera plugged into a TV, so that only this TV can receive the TV signal, and no other TV can receive it. This is called a closed circuit.

It is the advertisers who confuse consumers and confuse the concept.

First of all, the signal, that is, the cable TV station to your home, there is an analog signal in it, you can watch it with a general TV, and the general TV is an analog TV;

In areas where digital TV is opened, there are also digital transmission of TV signals in the wires of cable stations (you don't need to understand how these signals can be transmitted in a wire), this signal has strong anti-interference ability, and the drawing system is very good, (by the way, analog TV signals have interference manifested as snowflake spots and ripples, while digital TV signals have interference manifested as variegated squares or rectangular strips) General TV can not be watched, only the set-top box is used to convert digital signals into analog signals and then transmit them to TV.

Let's talk about TV,The internal circuit of the TV is called analog TV (that is, ordinary TV),The internal use of digital circuits (such as some digital chips) is called digital TV (note,This kind of digital TV can only watch analog signals),And there is a TV that will set top box function (convert digital signals into analog signals) to do the surface of the TV,This is also called digital TV。

Let's talk about the transmission method, the general TV station (** station, provincial station) is transmitted by satellite, which is called satellite TV in foreign countries, which means that the TV signal can be received with a satellite antenna, and China does not allow individuals to install satellite antennas, so these signals are received by cable TV stations around the country from the satellite and transmitted to residents' homes through cable TV cables.

There is also a kind of TV, which only uses the cable of the cable TV station to transmit, and the signal is not on the satellite, which is called cable TV, such as the cable stations in various places, and this kind of TV can only be viewed by connecting the cable cable.

To add,Some TVs can see programs by buying a small antenna,The program is by no means satellite TV,It is a local TV program that is transmitted by microwave for users who have not opened cable,Usually there are few programs only ** and local provincial stations。

Answer: If you want to connect to the terrestrial digital signal of ordinary TV, you need to buy a digital electric sparrow set-top box. The digital TV set-top box can receive digital signals such as satellites and the earth's core plane, and then convert the signals into analog signals and output them to ordinary TVs.