High Definition Television ( HDTV)

High Definition Television ( HDTV) is an umbrella term for high-definition digital TV, which works with more lines than NTSC or PAL television standard. According to the original goal of HDTV , the resolution should be twice as high as the national television . That would be in Europe and 1,250 lines for NTSC it would be 1,050 rows.

The activities for high-definition television were primarily driven in the U.S., where the Federal Communication Commission (FCC) and the American Television Standards Committee (ATSC ) accompanied the standardization. According to the U.S. two standard image formats have been standardized according to BT.709 with different resolution : 1,920 x 1,080 and 1,280 x 720 pixels , and it is shown the image points.
Identification of the various options for HDTV
IDENTIFICATION OF VARIOUS TYPES HDTV encyclopedia , compendium , computer , it, electronics
In Europe, an alternative concept with different image resolutions was drawn up as part of a Eureka project, from which eventually the two already mentioned image formats are selected. The aspect ratio of HDTV is 16:9 , the refresh rate is 24-60 frames per second. Both HDTV formats are specified using the line count and refresh rate , separated by a slash . That with the lower resolution than 720 /25 and the high-resolution with 1.080/25 . With additional letters after the number of lines the scanning is made clear : " i" stands for interlaced , so for interlaced , "p" for progressive scan and psF for Progressive Segmented Frame. The variant identification can then look like this: 720p/30 or 1.080i/29 , 97 So 1080i is an interlaced display with a resolution of 1,920 x 1,080 pixels, which corresponds to the so-called full HD . Is shown in the same resolution progressive scan , then it is referred to as 1080p .
For video compression using MPEG -2 HDTV , but increasingly the more efficient video codecs such as H.264/AVC and Windows Media Video ( WMV HD ) are used , the MPEG -2 are superior in compression and image quality. These are provided in the DVB-S2 standard .
In addition to other formats for HDTV digital TV have been standardized by the ATSC , the Enhanced Definition Television ( EDTV) , standard definition television (SDTV ) , low definition television ( LDTV ) and the extremely high-resolution ultra - HDTV ( UHDTV ) .
For the transfer and storage of data streams definition video ( HDV) and AVCHD developed two digital video formats with high .