Advanced Television Systems Committee
Advanced Television Systems Committee ( ATSC short ) is a U.S. organization that sets standards for digital television. It was founded in 1982 as part of the Advanced Television Committee and has its headquarters in Washington, DC
The standards include specifications for ATSC high definition digital television (HDTV ), EDTV and lower quality standard digital television ( SDTV).
The ATSC standard to replace the U.S. NTSC television system. The HDTV standards under the umbrella of the ATSC standard 16:9 reproduce images with a maximum resolution of 1920x1080 pixels, ie almost six times higher resolution than the old NTSC standard ( 640x480 / 720x486 ). However, it is listed in this standard significantly more resolutions. SDTV six channels, or a channel HDTV and SDTV four channels can be transmitted on a 6 MHz wide channel.
ATSC is the North American counterpart to the DVB -T standard. All the major cities of America have now switched to ATSC, but the analog transmitters send in Simulcastbetrieb further, since one of the poorer sections of the population that make up the majority of terrestrial viewers, does not want to turn off the television signal from today to tomorrow. The analog NTSC television broadcasts should be set on 17 February 2009. With the " DTV Delay Act" came into force on 11 February 2009, the date to June 12, 2009 has been postponed. This applies only to terrestrial transmissions. Cable and satellite transmissions are not affected by this measure.
The ATSC standard uses the following profiles:
- 8 -VSB: 19.39 Mbit / s ( terrestrial) 6 MHz bandwidth.
- 16 -VSB? Mbit / s (cable) 6 MHz bandwidth.
Depending on the quality of the frame rate between 24 frames varies (SDTV ) and 60 frames per second (HDTV).
640x480 (4:3 SDTV) interlaced 29.97 ( 59.94 frames / s ) 30 ( 60 frames / s ) progressive 23.976 24 29.97 30 59.94 60
704x480 (4:3 or 16:9 SDTV) interlaced 29.97 ( 59.94 frames / s ) 30 ( 60 frames / s ) progressive 23.976 24 29.97 30 59.94 60
720x480 (4:3 or 16:9 SDTV) interlaced 29.97 ( 59.94 frames / s ) 30 ( 60 frames / s ) progressive 23.976 24 29.97 30 59.94 60
1280x720 (16:9 HDTV) progressive 23.976 24 29.97 30 59.94 60
1920x1080 (16:9 HDTV) interlaced 29.97 ( 59.94 frames / s ) 30 ( 60 frames / s ) progressive 23.976 24 29.97 30
It supports the following image formats:
- 480i60, 480p30 (NTSC)
- 720p24, 720p30, 720p60
- 1080p24, 1080p30