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  • Harmonic Distortion

    Distortion that occurs when an audio component adds unwanted overtones 
    to the original music tones.

  • HDTV

    High-Definition Television is a widescreen, near-film-quality format 
    featuring Dolby® Digital audio (but not necessarily 5.1-channel). 

    The two most common HDTV varieties feature 1,080-line interlaced scan 
    (1080i) and 720-line progressive scan (720p). Basically, 1080i has 1,080 
    lines of vertical resolution and 1,920 pixels across each line. 720p has 
    720 vertical lines with 1,280 pixels across each line. The greater density 
    of pixels provides a higher definition of picture.

    Plasma, LCD TVs and 3LCD or DLP Projectors having an HD-ready logo 
    signify their compatibility to reproduce the high definition signals from 
    transmissions or other HD source including Blu-ray Disc, though not 
    necessarily reproducing the complete experience of FULL HD - please 
    check with your TV Instruction Book or supplier .

    The majority of TVs produced since 2008 are FULL HD and as such 
    reproduce the complete HD signal to its maximum.

  • HDMI

    High Definition Multimedia Interface was developed to meet the 
    demand for high-definition video and audio. With the release of HD 
    content from broadcasters, studios and others, traditional ways to 
    connect consumer electronics devices fall short of delivering the 
    ultimate high-definition viewing and listening experience.


    To address this issue, leading consumer electronics manufacturers 
    gathered to develop a next-generation digital interface that would 
    meet the requirements for consumer electronics products today 
    and in the future.
    These Founder companies comprise of Hitachi, Matsushita Electric 
    (Panasonic), Royal Philips Electronics, Silicon Image, Sony 
    Corporation, Thomson and Toshiba Corporation. HDMI is also 
    supported by major motion picture producers, as well as satellite 
    and cable companies. 
    The basic HDMI digital interconnect provides:
    - Superior, uncompressed digital video and audio quality;
    - A simple, single cable and user-friendly connector that replaces 
      the maze of cabling behind the entertainment centre;
    - Integrated remote control;
    - A popular interface enabling the transmission of high-definition 
      content. HDMI opens the floodgate of digital content from major 
      motion picture producers.

    In short, the use of HDMI to connect all of your high-definition devices, 
    displays and components will enable you to maximize your home 
    theatre system and experience digital content the way it was intended.


    As technology advances, so do the connections, hence the improved 
    series of cables. HDMI now have a 1.4 series format that has Ethernet 
    More information and answers to your questions, just click on Q&A.

  • Hertz

    A unit of frequency or referred to as Cycles per second - the UK 
    220/240 volt frequency is 50Hz - the USA 110/120 volt frequency is 60Hz

  • HF

    High Frequency - a radio frequency lying between 30 and 3 megahertz.

  • High Pass Filter

    A filter that transmits all frequencies above a specified value, 
    attenuating frequencies below this value.

  • Hi-Fi

    High Fidelity - many times misused to describe inferior audio systems. 
    The term should only be used when refering to the reproduction of sound 
    using electronic equipment that gives faithful reproduction with little or 
    no distortion.

  • Heat Sink

    A metal plate designed to conduct and radiate heat from an electrical 

  • HD DVD

    HD DVD - [High Definition- Digital Versatile Disc] delivers the capacity 
    necessary for all sorts of recorded content, including movies and live 
    performances. There are two kinds of single-sided HD DVD discs for 
    content playback: the 15GB single-layer disc, and the dual-layer disc 
    with double the capacity, a full 30GB. Using the latest compression 
    technologies, the 30GB disc can store up to 8 hours* of 1,125-line 
    HD images. Playback time was dependent on data transfer rate.

    As a comparision, conventional DVD has a capacity of 4.7GB and 
    can contain 2 hours of 525-line standard definition (SD) images; the 
    30GB HD DVD has space enough for 48 hours of SD images.

    The format was up against the Blu-ray Disc format and as of January 
    2008, lost the 'battle' to be a leading media for HD reproduction. 
    Toshiba led the HD-DVD camp though has since, August 2009, 
    launched a Blu-ray Disc Player to its portfolio.