Glossary (H)

Glossary terms, covering electronic products with the letter H.

H.264/MPEG-4 AVC

Video compression standard used to encode the majority of current video formats, such as: TNT HD, Blu-ray, YouTube videos, etc. MPEG-4.10 successor MPEG-4.2 provides a very high image accuracy. Its most common resolutions are those of modes 480p, 720p, 1080p and 1080p 3D, but the standard also provides support for 4K resolution.

HEVC

Video encoding standard to replace the standard AVC (H.264) used for storing Blu-ray and HD Freeview emissions. This is strictly speaking the H.265 video codec, which provides a higher compression ratio for an equivalent quality, if not higher. The HEVC codec is used for encoding HD videos in 4K UHD and is now supported by the new generation of 4K UHD TVs.

Home Theater

This term refers to, as the name implies, movie watching at home, in conditions close to that of a movie theater. A home theater installation involves a quality video display and an audio system suitable for multichannel sound reproduction.

Homeplug AV

HomePlug AV is the new version of the standard Powerline communication (PLC). HomePlug AV is fully compatible with the HomePlug standard and can reach 200 or 500 Mbps (instead of 14 and 80 Mbps with previous versions). It secures your data (AES instead of DES), and enables new features such as streaming audio and video in high definition.

Hotspot

Development of public wireless access compatible with WiFi standard. They are found in public places such as train stations or museums. Some modems supplied by ISPs have a hotspot mode, activated by the user, in order to share its connection.

HDCD

Evolution of the standard Audio-CD, HDCD uses the same physical and software features, while increasing the dynamic range. The resolution increases from 16 bits to 20 bits. However, the audio stream is compressed in part, with a ratio of 4:1 for additional data. In contrast, SACD, stores music without compression and at a higher resolution (24-bit and 96/192 kHz).

HVD

Slightly larger than a CD, 13 cm instead of 12, enclosed in a cartridge such as DVD-RAM, the HVD (Holographic Versatile Disc) has existed since mid-2007 for professional archiving applications. Its theoretical capacity is a massive 3.9 TB. However, the first mass-market drives and burners will be limited to 300 GB and a read/write speed of 20 MB/s.

HDMI

HDMI is a digital cable that replaces the SCART that is analog. This is a digital interface for audio and video signals, including high definition. It supports all video standards (2D/3D), multi-channel audio, inter-device control and Ethernet data transport.

HDR: Hard Disk Recording

Recording system for video and audio on a TV set-top box or computer hard drive. The system behaves like a tape/VCR but the magnetic strip is replaced by a digital disk, sometimes removable. Some DVD players/recorders also have a hard drive to record programs without having to burn a disc.

Hyperfocal

Minimum distance (which depends on the focal length and aperture) at which the image is focused to infinity. This can be useful when working with auto-focus disengaged for action shots (skiing, parachuting), which is easier with a wide angle lens.

HDCP (High-Bandwidth Digital Content Protection)

Copy protection standard on HD content carried on all devices with one input and/or digital DVI and/or HDMI. If the broadcaster is not HDCP compliant, the source (DVD player, Blu-ray) sends a poor quality signal or no signal at all! It is effective against piracy of movies in HD. Some filters exist that are interposed between the source and the diffuser to bypass this protection and disseminate a digital image on a non-HDCP compliant device.

HDTV 1080p

HDTV 1080p means that the TV has a native resolution of 1080p (1920 x 1080) and has an HD tuner (MPEG4).

HDTV

HDTV means that the TV has a native resolution of 720p (720 pixels per line), and it incorporates a Freeview HD tuner (MPEG4).