Difference between satellite TV, cable TV, wireless TV and digital TV:

1, the concept is different:

Satellite TV: Satellite TV is the use of geosynchronous satellites will be digitally encoded and compressed television signals transmitted to the user end of a form of broadcasting television. There are two main ways. One is to transmit digital television signals to the cable front-end, and then converted by the cable station into analog television transmission to the user's home.

Cable TV: Originally referred to as "public antenna TV", it now refers to all cable or fiber-copper hybrid systems that are used to transmit video signals to communities and homes.

Wireless TV: A mode of transmitting television signals in which radio towers are set up on the ground to broadcast television programs by radio waves.

Digital television: a television system that processes signals digitally from program acquisition, program production, program transmission, all the way to the subscriber.

Satellite television, cable television, wireless television is the three transmission methods of television broadcasting, digital television refers to the type of signal is digital, previously analog, is now experiencing analog to digital transformation.

2, different characteristics:

Satellite television: television programs from a ground station sent to communications satellites, and then forwarded to other ground stations, the ground station receives the signal is transmitted to the local television station rebroadcast.

Cable TV: cable TV can use neighboring frequency transmission, unlike radio as to prevent interference, in an area must be used to separate frequency transmission, so the spectrum resources can be fully utilized, can provide more channels.

Wireless TV: Radio towers are set up on the ground to broadcast TV programs by radio waves.

Digital TV: all the signals of this system are transmitted through the digital stream consisting of 0, 1 digital strings, the transmission of large data streams to ensure that the high definition of digital TV, to overcome the inherent shortcomings of analog TV.

Expanded Information:

Comparison of Digital and Analog TV

1, Sound and image:

The analog transmission of television signals in transmission is susceptible to interference, the noise will be constantly superimposed, the image quality is only comparable to the level of super VCD, accompanied by only mono and stereo two kinds of sound.

Digital TV adopts MPEG-2 coding, which has strong anti-interference and error-correction ability in transmission, clear picture, and the image quality can reach the level of DVD, and it can provide a variety of accompaniment methods, such as mono, stereo, multi-language, multi-channel and surround sound.

2, the number and types of programs:

Analog TV can only transmit TV programs and FM broadcasts, up to 79 sets.

Digital TV can transmit more than 500 sets of TV programs and radio programs. It can also provide a variety of services at the same time, such as audio broadcasting, data broadcasting, interactive TV, TV shopping, etc. The services are no longer limited to traditional video programs.?

3, personalized services:

Traditional analog TV does not provide personalized services, all users receive the same program, there is no special data service channel, to know the program content can only be accessed through the radio and television newspapers or watch TV promos.

Baidu Encyclopedia-Digital Television