The Television Decoder Circuitry Act of 1990
("TDCA") requires generally that television receivers contain circuitry to decode and display closed
captioning. The introduction of digital television requires the Commission to update its rules to fulfill its
continuing obligations under the TDCA to ensure that closed captioning service continues to be available to
consumers.
Decoders must support the standard, large, and small caption sizes and must allow the caption provider
to choose a size and allow the viewer to choose an alternative size.
Decoders must support the eight fonts listed in EIA-708. Caption providers may specify 1 of these 8 font
styles to be used to write caption text. Decoders must include the ability for consumers to choose among
the eight fonts. The decoder must display the font chosen by the caption provider unless the viewer
chooses a different font.
Decoders must implement the same 8 character background colors as those that Section 9 requires be
implemented for character foreground (white, black, red, green, blue, yellow, magenta and cyan).
Decoders must implement options for altering the appearance of caption character edges.
Decoders must display the color chosen by the caption provider, and must allow viewers to override the
foreground and/or background color chosen by the caption provider and select alternate colors.
Decoders must be capable of decoding and processing data for the six standard services, but information
from only one service need be displayed at a given time.
Decoders must include an option that permits a viewer to choose a setting that will display captions as
intended by the caption provider (a default). Decoders must also include an option that allows a viewer's
chosen settings to remain until the viewer chooses to alter these settings, including during periods when
the television is turned off.
Cable providers and other multichannel video programming distributors must transmit captions in a
format that will be understandable to this decoder circuitry in digital cable television sets when
transmitting programming to digital television devices.
All digital television receivers with picture screens in the 4:3 aspect ratio measuring at least 13 inches
diagonally, digital television receivers with picture screens in the 16:9 aspect ratio measuring 7.8 inches
or larger vertically (this size corresponds to the vertical height of an analog receiver with a 13 inch
diagonal), and all DTV tuners, shipped in interstate commerce or manufactured in the United States must
comply with the minimum decoder requirements we are adopting here.