HDCP - High-bandwidth Digital Content Protection. Copy-protection scheme developed by Intel to be used in conjunction with DVI and HDMI connections.

HDMI - High-Definition Multimedia Interface. USB-like digital video connectivity standard designed as a successor to DVI; can transmit both uncompressed digital audio and video signals; protected by HDCP digital copy protection.

HD-DVD - High-definition digital video disc. Several formats have been proposed for these high-capacity DVDs, including Blu-ray.

HDTV - High-definition television. High-resolution digital television broadcast and playback system composed of roughly a million or more pixels, 16:9 aspect-ratio screens, and AC3 digital audio. A subset of digital television, HDTV formats include 1080i and 720p resolution.

HDTV-ready - Used to describe any TV that can display high-definition formats when connected to a separate HDTV tuner or source. These TVs generally have built-in tuners for receiving regular NTSC broadcasts, but not ATSC digital broadcasts. The CEA's official term for an HDTV-ready TV is HDTV monitor.

HDTV monitor - Official CEA term for HDTV-ready.

HDTV tuner - See DTV tuner

horizontal resolution - Number of vertical lines (or pixels) that can be resolved from one side of an image to the other. While the vertical resolution of all analog video sources is the same (480 lines), the horizontal resolution varies according to the source. Some examples for typical sources: VHS VCRs (240 lines), analog TV broadcasts (330 lines), non-HDTV digital satellite TV (up to 380 lines), and DVD players (540 lines). DTV signals have horizontal resolution that ranges from 640 lines for SDTV to 1,280 lines (for 720p HDTV) or 1,920 lines (for 1080i HDTV).