What is an HD Television?
Definition of HD Television
High-definition television (HDTV) describes a television or video system that provides a substantially higher image resolution than its predecessor, standard-definition television (SDTV). Adopted as the standard video format for most broadcasts including terrestrial, cable, and satellite television, HDTV delivers a significantly clearer, more detailed, and vibrant picture.
Key improvements include less flicker and superior rendering of fast motion, thanks to higher frame rates and progressive scanning. Modern HDTV typically features a 16:9 widescreen aspect ratio, enhancing the immersive viewing experience compared to the older 4:3 format.
Key Features
- High Definition Resolution: Images composed of significantly more pixels, leading to sharper details.
- Enhanced Picture Quality: Richer colors, deeper contrasts, and greater clarity compared to SD.
- Widescreen Aspect Ratio (16:9): A cinematic viewing experience, matching modern content production.
- Improved Audio Quality: Support for advanced audio formats like Dolby Digital 5.1 for immersive sound.
Visual Comparison: HD vs. Standard Definition
Standard Definition (SD)
Lower resolution, less detail, often 4:3 aspect ratio.
High Definition (HD)
Higher resolution, more detail, 16:9 widescreen aspect ratio.
Technical Specifications
| Specification | Details |
|---|---|
| 720p (1280x720) Considered 'HD Ready', offering 921,600 pixels. A common entry-level HD resolution, often used for broadcasts. | Resolution of at least 720 vertical lines, progressive scan. |
| 1080p (1920x1080) Known as 'Full HD', providing 2,073,600 pixels. Offers significantly more detail than 720p and is a widely adopted standard. | Full High Definition, 1080 vertical lines, progressive scan. |
| 4K (3840x2160) Often referred to as Ultra HD, with 8.3 million pixels, four times that of Full HD. Provides exceptional clarity and detail. | Ultra High Definition, 2160 vertical lines, progressive scan. |
| HDMI Connectivity High-Definition Multimedia Interface for transmitting uncompressed video and multi-channel audio data digitally. | Digital interface for transmitting audio and video. |
| Support for Digital Broadcasts | Compatibility with digital television standards (e.g., DVB, ATSC). |