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Discussion in 'Electronic Basics' started by rakimon, Feb 27, 2006.

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  1. rakimon

    rakimon Guest

    My major is Computer Science but I am working on a project that
    involves much about video signals. I have verly little knowledge about
    the video signal standards and formats. I need a clear explanation of
    how NTSC/PAL/SECAM the broadcast standards are related to the video
    standards/formats such as composite,component and s-video. Some
    articles refer to NTSC/PAL/SECAM as video formats and some refer to
    composite, component and s-video as video formats. Iam confused with
    these basics.
    And I also need to know if CMOS, TTL, Firewire are also video
    formats. If not, how are they related to video signals. Please someone
    make me understand these minute details.
    Thanks in advance
     
  2. Composite video would refer to a complete NTSC/PAL/SECAM video signal,
    including all colour and sync information which can be carried on a
    single wire.

    Component video would refer to separate red, green, and blue (or
    perhaps other divisions), and perhaps a separate sync signal, all
    carried on separate wires.
    CMOS and TTL are technologies used to produce digital integrated
    circuits. Firewire is a digital communications bus. It may be used
    to carry digital data that represents a video signal.
     
  3. Bob Myers

    Bob Myers Guest

    This just highlights the fact that the term "format" is much-used (and
    abused) to mean a whole LOT of different things in the video industry.
    To some, "format" (esp. when talking about "digital" video) means the
    same thing as what is also called "pixel format" or "addressability" (and
    which is often ALSO mislabelled as "resolution"); to others, it's that
    plus the specifics of the timing, or both of THOSE plus a specific
    color encoding technique. And so forth and so on.

    Technically, "NTSC," "PAL," and "SECAM" refer to color encoding
    methods, although these are also often used interchangeably with the
    raster-scan standards most commonly used with each - i.e., "NTSC"
    for the 525-line, 60 Hz field rate scanning standard ("525/60"),
    and "PAL" or "SECAM" for 625/50. "Composite" and "component"
    have more to do with how the various parts of the video signal
    (specifically, luminance and chrominance) are carried on the physical
    interface, and "CMOS," "TTL" and "FireWire" are definitely various
    classes/types of electrical interface ("CMOS" and "TTL" are actually
    generic names for digital logic "families," which is a whole 'nother
    problem). "S-Video" is, at a minimum, a specific connector standard,
    although it's also often (mis-)used to refer to an interface with
    separate luminance (Y) and chrominance (C) connections.

    To really give you a complete answer would require a lot more space
    than is available here; I will (at the risk of being accused of spamming)
    point you to my book on the subject, "Display Interfaces: Fundamentals
    & Standards," published by J. Wiley and Sons and available from
    Amazon (among others), and possibly in your local engineering library.
    Just so this doesn't appear to be QUITE as blatant a case of self-promotion,
    there's also a very excellent text which covers quite a range of TV
    standards, specifically, in great detail: "Digital Television Fundamentals,"
    by Robin & Poulin, and published by McGraw-Hill. (Despite the name,
    it also contains quite a bit of information on the original analog broadcast
    systems.

    Bob M.
     
  4. rakimon

    rakimon Guest

    Thankyou Mr. Bob Mayers for the information provided. It did help clear
    out the confusion. I will refer to the mentioned textbooks for more
    detail.
     
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