Improved-definition television

Improved-definition television (IDTV) or enhanced-quality television transmitters and receivers exceed the performance requirements of the NTSC standard,[1] while remaining within the general parameters of NTSC emissions standards.[2]

IDTV improvements were introduced in the late 1980s,[2][3] and may be made at the television transmitter or receiver.[4] Improvements include enhancements in encoding, digital filtering, scan interpolation,[3] interlaced line scanning, and ghost cancellation.

IDTV improvements must allow the TV signal to be transmitted and received in the standard 4:3 aspect ratio.

The only relevant implementation of IDTV for NTSC-based broadcasts before the introduction of full-digital TV distribution (DTV) was the Japanese Clear-Vision. In European countries, PALplus and MAC had a similar role. The more commonly used term for advanced display technology before the advent of high-definition television (HDTV) was enhanced-definition television (EDTV), used for instance for plasma TV sets with a 16:9 aspect ratio in the early 2000s.

## See also

* Enhanced-definition television (EDTV)
* Clear-Vision
* PALplus
* Comb filter
* Federal Standard 1037C
* Video scaler

## References

1. ↑ Weik, Martin (2012-12-06) (in en). Communications Standard Dictionary. Springer Science & Business Media. pp. 439. ISBN 978-1-4613-0429-6. https://books.google.com/books?id=pVvSBwAAQBAJ.
2. ↑ 2.0 2.1 Barten, Gene (1989-01-30). "New Clarity Level Dazzles Viewers". The Bulletin: pp. B-3. https://books.google.com/books?id=ZEdTAAAAIBAJ&dq="Improved-definition+television"&pg=PA5&article_id=5333,560776.
3. ↑ 3.0 3.1 Advokat, Stephen (1988-07-03). "´Smarter´ TV sets available". Beaver Country Times: pp. D-4. https://books.google.com/books?id=C7YiAAAAIBAJ&dq="Improved-definition+television"&pg=PA25&article_id=4448,412000.
4. ↑ Webre, Philip (1990) (in en). The Scope of the High-definition Television Market and Its Implications for Competitiveness. Congressional Budget Office. pp. 2. https://books.google.com/books?id=X3pH7rerqC0C.

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