Overscan: Difference between revisions

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==Datacasting==

Analog TV overscan can also be used for datacasting. The simplest form of this is closed captioning and teletext, both sent in the vertical blanking interval (VBI). Electronic program guides, such as TV Guide On Screen, are also sent in this manner. Microsoft's HOS uses the horizontal overscan instead of the vertical to transmit low-speed program-associated data at 6.4 kbit/s, which is slow enough to be recorded on a VCR without data corruption.<ref>{{cite web|url=http://www.microsoft.com/about/legal/intellectualproperty/search/details.mspx?ip_id=IDAEQMXD&techType=&ipCat=Any&feeStructure=Any&keywords=&ipVenture=true |title=Microsoft Intellectual Property and Licensing |publisher=Microsoft.com |date=2011-10-27 |accessdate=2012-01-04}}</ref> In the United States, National Datacast used Public Broadcasting Service network stations for overscan and other datacasting, but they migrated to digital TV due to the digital television transition in 2009.

Analog TV overscan can also be used for datacasting. The simplest form of this is closed captioning and teletext, both sent in the vertical blanking interval (VBI). Electronic program guides, such as TV Guide On-Screen, are also sent in this manner. Microsoft's HOS uses the horizontal overscan instead of the vertical to transmit low-speed program-associated data at 6.4 kbit/s, which is slow enough to be recorded on a VCR without data corruption.<ref>{{cite web|url=http://www.microsoft.com/about/legal/intellectualproperty/search/details.mspx?ip_id=IDAEQMXD&techType=&ipCat=Any&feeStructure=Any&keywords=&ipVenture=true |title=Microsoft Intellectual Property and Licensing |publisher=Microsoft.com |date=2011-10-27 |accessdate=2012-01-04}}</ref> In the United States, National Datacast used Public Broadcasting Service network stations for overscan and other datacasting, but they migrated to digital TV due to the digital television transition in 2009.

==Overscan amounts==

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 ==Datacasting==
-Analog TV overscan can also be used for datacasting. The simplest form of this is closed captioning and teletext, both sent in the vertical blanking interval (VBI).  Electronic program guides, such as TV Guide On Screen, are also sent in this manner. Microsoft's HOS uses the horizontal overscan instead of the vertical to transmit low-speed program-associated data at 6.4 kbit/s, which is slow enough to be recorded on a VCR without data corruption.<ref>{{cite web|url=http://www.microsoft.com/about/legal/intellectualproperty/search/details.mspx?ip_id=IDAEQMXD&techType=&ipCat=Any&feeStructure=Any&keywords=&ipVenture=true |title=Microsoft Intellectual Property and Licensing |publisher=Microsoft.com |date=2011-10-27 |accessdate=2012-01-04}}</ref>  In the United States, National Datacast used Public Broadcasting Service network stations for overscan and other datacasting, but they migrated to digital TV due to the digital television transition in 2009.
+Analog TV overscan can also be used for datacasting. The simplest form of this is closed captioning and teletext, both sent in the vertical blanking interval (VBI).  Electronic program guides, such as TV Guide On-Screen, are also sent in this manner. Microsoft's HOS uses the horizontal overscan instead of the vertical to transmit low-speed program-associated data at 6.4 kbit/s, which is slow enough to be recorded on a VCR without data corruption.<ref>{{cite web|url=http://www.microsoft.com/about/legal/intellectualproperty/search/details.mspx?ip_id=IDAEQMXD&techType=&ipCat=Any&feeStructure=Any&keywords=&ipVenture=true |title=Microsoft Intellectual Property and Licensing |publisher=Microsoft.com |date=2011-10-27 |accessdate=2012-01-04}}</ref>  In the United States, National Datacast used Public Broadcasting Service network stations for overscan and other datacasting, but they migrated to digital TV due to the digital television transition in 2009.
 ==Overscan amounts==