Improved-definition television (IDTV) or enhanced-quality television transmitters and receivers exceed the performance requirements of the
NTSC standard, while remaining within the general parameters of NTSC emissions standards.
IDTV improvements may be made at the
television
Television, sometimes shortened to TV, is a telecommunication medium for transmitting moving images and sound. The term can refer to a television set, or the medium of television transmission. Television is a mass medium for advertisin ...
transmitter or receiver. Improvements include enhancements in encoding,
digital filtering, scan interpolation, interlaced
line scanning, and
ghost cancellation.
IDTV improvements must allow the TV
signal
In signal processing, a signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. The '' IEEE Transactions on Signal Processing' ...
to be transmitted and received in the standard 4:3
aspect ratio.
See also
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Comb filter
In signal processing, a comb filter is a filter implemented by adding a delayed version of a signal to itself, causing constructive and destructive interference. The frequency response of a comb filter consists of a series of regularly space ...
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Federal Standard 1037C
Federal Standard 1037C, titled Telecommunications: Glossary of Telecommunication Terms, is a United States Federal Standard issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, a ...
*
Video scaler
A video scaler is a system which converts video signals from one display resolution to another; typically, scalers are used to convert a signal from a lower resolution (such as 480p standard definition) to a higher resolution (such as 1080i hig ...
References
{{FS1037C
Television technology