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35071 2009 年 09 月 28 日 21:43 Reading (loading. ..) Comments (0) Category: Audio Digital
Today, CCTV and other provincial TV station launched a 10-channel high-definition channels will start to set the high standard-definition broadcast signal synchronization. Perhaps we will find, in addition to wider aspect ratio, the high-definition nothing to wonder; However, when CBS broadcast the first time the U.S. high-definition signal transmission when the evening news, the hosts had the high-definition television described as \the history of television after another great change. \In the development of digital TV in China has replaced many times to steal the concept, can be very practical, said, we now see the \as \
HD, English as the \Generally called HD, there are four means: HDTV, HD equipment, high-definition format, HD movies. HDTV, also known as \Generally called HD, on behalf of that is the largest high-definition TV. TV's resolution is based on the number of horizontal scan lines as the measure.
What is HDTV?
HDTV is \Complete high-definition digital television system includes: high-definition TV source, HD set-top boxes, HD televisions and the necessary transmission network, are indispensable.
compared to traditional analog TV and standard definition digital television, HDTV image resolution improved several times, to 1920 × 1080, while the standard definition digital TV resolution is only 720 × 576. HD 16:9 aspect ratio used by the big-screen broadcast way to make television programs with more realistic and appealing.
This is a scaled-down after the various control chart definition television programs.
The following table can tell you that all TV definition of the specification, if you choose to store high-definition televisions to home appliances, this is a need to understand the indicators.
scanning format
Name
Resolution
Equivalent
Vertical scanning lines
Horizontal scan lines
Interlace / Progressive
Aspect ratio D1
480i
704 × 480
NTSC analog TV resolution
525
483
Interlaced
4:3 or 16:9 -
576i
704 × 576
PAL analog TV resolution
625
576
Interlaced
4:3 or 16:9 D2
480p
640 × 480
Progressive scan DVD Specifications
525
480
Progressive
4:3 or 16:9 D3
1080i
1920 × 1080
One of the standard digital TV display mode
1125
1080
Interlaced
16:9 D4
720p
1280 × 720
One of the standard digital TV display mode
750
720
Progressive
16:9 D5
1080p
1920 × 1080
One of the standard digital TV display mode
1125
1080
Progressive
16:9
start from the D3, it can be called \TV reaches a resolution of 1920 × 1080 can only be called a full sense of the high-definition television, or even can receive 1080p signals, it must reduce the resolution to the TV can display to display,
chloe bag, and can not achieve the perfect high-definition effect.
than HDTV and conventional television, in addition to different resolution, there is a feature of the 4:3 frame is expanded to 16:9, the screen displays the content than the original wide.
present, 12 countries around the world have launched high-definition television programs, including the United States, Canada,
mulberry bags, Japan, Australia,
gucci bags, South Korea, Germany, Austria and some Scandinavian countries. In 2015, China will basically stop broadcasting analog TV signals, then gradually turned to all-digital HD signals cable, wireless and satellite broadcast.
Here we simply list a table to compare. Country / Region
HD time to promote the United States
November 1999 Japan
December 2003 in Taiwan
June 2004 Hong Kong
December 2007 Macau
China in July 2008
September 2009
United States in 1998 was the first to broadcast HD programming, has been abolished earlier this year, standard definition broadcast. Hong Kong, Japan and other places also have a rich source of high-definition films. TVB recently shot \
HD in the end good?
definition is the traditional TV 4 times
a lot of people do not understand the \In fact, this is relative to the current widespread use of our TV's - \First, the division between the two can see from the video. Because the image quality and bandwidth of the channel share of different transport, making the digital television signal into HDTV (high definition TV),
mulberry bag, SDTV (standard definition TV) and LDTV (standard definition TV). HDTV from a visual point of view the highest specifications.
how to watch HDTV?
need to buy a HDTV set-top box
on high-definition TV, there are many errors. Many people think that buying a high-definition TV will be able to watch high-definition television programs. Actually not the case, there is no access to high-definition signals, high-definition TV to play no proper effect. Present only in the high-resolution high-definition TV in line with the requirements, do not have the processing power of HD signals, through \That is, we go to the relevant departments to buy high-definition cable set-top box Caixing. In addition, many people believe that watching high-definition have to be LCD, plasma and other technologies with high-definition TV receiver to watch HD programming, in fact, ordinary TV can receive HD signals. According to experts, the current standard definition crt TV can receive HD signals just as effective as high-definition TV viewing better. Also, watch high-definition television programs, we can also use the HD notebook, if you want to enjoy the live version of Yingyuan results can select high-definition projector.
the difference between SD and HD?
for the \Because the image quality and bandwidth of the channel share of different transport, making the digital television signal into HDTV (high definition TV), SDTV (standard definition TV) and LDTV (standard definition TV). HDTV from a visual point of view the highest specifications, the image quality may be at or near the level of 35mm wide-screen movies, which requires the video content and display equipment above the level of resolution 1000, resolution up to 1920 × 1080. From the quality point of view, roughly equivalent to the HD resolution 4 times that of traditional analog TV, picture clarity, color reproduction level should be much better than traditional TV. The 16:9 widescreen display brings a broader visual enjoyment. From an audio effect, the high-definition TV programs will support Dolby 5.1 channel surround sound, and high-definition video programs will support Dolby 5.1 True HD specification, this will bring us super-shocked listening enjoyment.
what is high and standard definition channels with the broadcast?
\
high SD simulcast programs and specialized programs produced slightly different definition. To make standard-definition viewers do not miss the message screen, high-standard definition with the broadcast program will station logo, column headings, captions and other information fixed in the center of the screen 4:3 within the virtual box. Even if both sides are cut off the screen, the audience will not miss any information. However, it is clear perception of widescreen and standard screen is not the same.
What is digital TV?
digital TV means from the studio to the transmitter, transmission, all links are used to receive digital television signals or all of the signals transmitted to the system through the string of numbers 0,1 posed by the spread of digital stream TV type. Digital signal transmission rate of 19.39 megabytes per second, such a large data flow to ensure the delivery of high-definition digital TV, analog TV to overcome the defects. Also allows the digital television signals in several formats exist,
gucci bag, each digital channel can be divided into several sub-channels under which both can use a large data stream - 19.39 megabytes per second can also be divided for several shunt, for example 4, each of the speed is 4.85 megabytes per second, so although the image clarity will be greatly reduced, but it can greatly increase the types of information to meet different needs. For example, when a sporting event in the broadcast, viewers need high-resolution images,
handbag uk, television stations should be used to 19.39 megabytes per second transmission; and during the news broadcast, the audience noted that the news content rather than the broadcaster's image, So no need to use such a high-definition, then only the speed of 3 megabytes per second can be, and the remaining 16.39 megabytes can be used to transfer other content.
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