National Datacast
Encyclopedia
National Datacast Incorporated (NDI) is a pioneer in data broadcasting
.
It is a for-profit subsidiary
of the Public Broadcasting Service
(PBS) which handles datacasting
on PBS TV stations throughout the United States
. Services using ATSC digital TV include MovieBeam
and UpdateTV, for which bandwidth
is lease
d by other companies.
National Datacast was formed in 1988 based on PBS' early work in closed captioning for the hearing impaired.
It uses line 21 and other vertical interval lines for data transmission.
Datacasting
Datacasting is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television stations along with digital television, but may also be applied to digital signals on analog TV or radio...
.
It is a for-profit subsidiary
Subsidiary
A subsidiary company, subsidiary, or daughter company is a company that is completely or partly owned and wholly controlled by another company that owns more than half of the subsidiary's stock. The subsidiary can be a company, corporation, or limited liability company. In some cases it is a...
of the Public Broadcasting Service
Public Broadcasting Service
The Public Broadcasting Service is an American non-profit public broadcasting television network with 354 member TV stations in the United States which hold collective ownership. Its headquarters is in Arlington, Virginia....
(PBS) which handles datacasting
Datacasting
Datacasting is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television stations along with digital television, but may also be applied to digital signals on analog TV or radio...
on PBS TV stations throughout the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
. Services using ATSC digital TV include MovieBeam
MovieBeam
MovieBeam was a video-on-demand service started by Disney. Movies were sent wirelessly into the subscriber's home by embedding digital data within local Public Broadcasting Service stations' analog TV broadcast to deliver the movies to a set-top box...
and UpdateTV, for which bandwidth
Bandwidth (computing)
In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it .Note that in textbooks on wireless communications, modem data transmission,...
is lease
Lease
A lease is a contractual arrangement calling for the lessee to pay the lessor for use of an asset. A rental agreement is a lease in which the asset is tangible property...
d by other companies.
National Datacast was formed in 1988 based on PBS' early work in closed captioning for the hearing impaired.
It uses line 21 and other vertical interval lines for data transmission.