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
- ↑ Weik, Martin (2012-12-06). Communications Standard Dictionary. Springer Science & Business Media. p. 439. ISBN 978-1-4613-0429-6.
- ↑ 2.0 2.1 Barten, Gene (1989-01-30). "New Clarity Level Dazzles Viewers". The Bulletin. pp. B-3.
- ↑ 3.0 3.1 Advokat, Stephen (1988-07-03). "´Smarter´ TV sets available". Beaver Country Times. pp. D-4.
- ↑ Webre, Philip (1990). The Scope of the High-definition Television Market and Its Implications for Competitiveness. Congressional Budget Office. p. 2.
Public Domain This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C".
