Norpak Corporation was a company headquartered in Kanata, Ontario

Kanata, Ontario

Situated in the Ottawa Valley, Kanata is located about west-southwest of Downtown Ottawa along Highway 417 at a latitude of 45°18' North and a longitude of 75°55' West, with an area of . Its northern end is just to the west of the Ottawa River....

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, that specialized in the development of systems for television-based data transmission. In 2010, it was acquired by Ross Video

Ross Video

Ross Video Ltd is a privately held Canadian company that designs and manufactures equipment for live video production. The major products of the company are video production switchers or vision mixers, which were the basis for the founding of the company...

 Limited of Iroquois and Ottawa, Ontario.

Norpak developed the NABTS

NABTS

NABTS, the North American Broadcast Teletext Specification, is a protocol used for encoding NAPLPS-encoded teletext pages, as well as other types of digital data, within the vertical blanking interval of an analog video signal...

 (North American Broadcast Teletext Standard) protocol for teletext

Teletext

Teletext is a television information retrieval service developed in the United Kingdom in the early 1970s. It offers a range of text-based information, typically including national, international and sporting news, weather and TV schedules...

 in the 1980s, as an improved version to the then-incumbent World System Teletext

World System Teletext

World System Teletext is the name of a standard for encoding and displaying teletext information, which is used as the standard for teletext throughout Europe today....

, or WST, protocol. NABTS was designed to have improved graphics capability over WST, but required a much more complex and expensive decoder, making NABTS somewhat of a market failure for teletext. However, NABTS still thrives as a data protocol for embedding almost any form of digital data within the VBI

Vertical blanking interval

The vertical blanking interval , also known as the vertical interval or VBLANK, is the time difference between the last line of one frame or field of a raster display, and the beginning of the first line of the next frame. It is present in analog television, VGA, DVI and other signals. During the...

 of an analog video signal.

Norpak's products, now part of and complementary to the Ross Video line, include equipment for embedding data in a television or video signal such as for closed captioning

Closed captioning

Closed captioning is the process of displaying text on a television, video screen or other visual display to provide additional or interpretive information to individuals who wish to access it...

, XDS

Extended Data Services

Extended Data Services , is an American standard classified under Electronic Industries Alliance standard CEA-608-E for the delivery of any ancillary data to be sent with an analog television program, or any other NTSC video signal.XDS is used by TV stations, TV networks, and TV program...

, V-chip

V-chip

V-chip is a generic term for technology used in television set receivers in the USA, Canada, and Brazil which allows the blocking of programs based on their ratings category. It is intended for use by parents to manage their children's television viewing...

 data, non-teletext NABTS

NABTS

NABTS, the North American Broadcast Teletext Specification, is a protocol used for encoding NAPLPS-encoded teletext pages, as well as other types of digital data, within the vertical blanking interval of an analog video signal...

data for closed-circuit data transmission, and other data protocols for VBI transmission.