The so-called digital TV is to convert the traditional analog TV signal into a digital signal represented by a binary number after sampling, quantization and encoding, and then perform various functions of processing, transmission, storage and recording, or it can also be processed by an electronic computer , Monitoring and control. Using digital technology not only enables various TV devices to obtain higher technical performance than the original analog devices, but also has new functions that analog technology cannot achieve. For example, random storage can be directly performed to make the retrieval of TV images very convenient. , Copying digital TV images and transmitting digital TV images on the network will not cause quality degradation, and it is easy to edit non-linear TV. Digital TV has brought TV technology into a new era.
Strictly speaking, digital TV is a new generation of TV that uses digital encoding and digital transmission technology from the recording, broadcasting, transmission and reception of TV programs, so-called all-digital TV system. For the convenience of calling, "all-digital TV" is simply referred to as "digital TV". It takes a long period of transition for digital TV broadcasting to replace analog TV broadcasting. During the transition period, digital TV and analog TV will coexist for a considerable period of time. Users who do not want to buy digital TV can also add a set-top box to the analog TV. The set-top box decodes the digital TV signal transmitted from the optical cable into analog video and audio signals, and then sends them to the analog TV's AV jack. , Users can watch digital TV programs.
According to the resolution, digital TV can be divided into high-definition TV (HDTV), standard-definition TV (SDTV) and VCD quality low-definition TV (LDTV).
Among them, standard definition television (SDTV, Standard DefiniTIon TV) 480 interlaced scanning, mainly corresponds to the resolution level of the existing television. In terms of sound processing, there are two channels of digital sound, with CD-level sound quality (currently analog TV has only one channel of sound, which can be converted into stereo after being processed by the circuit). Therefore, the quality of SDTV images and audio is improved compared to current analog TV, and its channel utilization rate is high. In the current analog TV, 4 sets (or more) of standard definition TV programs can be played simultaneously.
High-definition television (HDTV, High DefiniTIon TV) is the highest level, its image resolution can reach 35mm film level. The ITU-R definition for high-definition television services is: "High-definition television should be a transparent system, and a viewer with normal vision should see the image quality at three times the height of the display screen of the system. The impression of the original scene or performance ". Its horizontal and vertical resolution is about twice that of conventional TV. There are multiple digital sounds, in addition to good sound quality, it also has true surround sound. High-definition TV pictures can provide an amount of information equivalent to 5 times the standard-definition TV pictures.
In addition, the US Consumer Electronics Association (CEA, Consumer Electronics AssociaTIon) proposed a new concept of enhanced definition TV in the definition of digital TV. The American Consumer Electronics Association is a branch of the American Electronics Industry Alliance, which represents more than 600 manufacturers in the fields of audio-visual, communications and mobile electronic equipment. According to the standards published by the association, digital TV is divided into three categories: high-definition television (HDTV), enhanced-definition television (EDTV) and standard-definition television (SDTV).
High-definition televisions must have at least 720 line progressive or interlaced line scans, and the screen aspect ratio should be 16 to 9, using Dolby Digital audio, which can convert high-definition formats to other formats and can receive and display lower formats. signal.
The enhanced definition TV must reach 480 line scans, which can change the format of 720 progressive and 1,080 interlaced into 480 progressive output, using Dolby digital audio.
The display scanning format of standard-definition television is lower than that of enhanced-definition television, that is, lower than the standard of progressive scanning of 480 lines.
We define the delivery quantity that more than 3 square meters as medium size and small volume orders. define the 3-50 square meters orders as small volume orders and the 50-200 square meters orders as medium size orders.
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