AC-3
Is the former name for Dolby Digital.
Aspect Ratio
Simply put, is the ratio between screen width and height ie 4.3 = 4 parts long & 3 parts high.
4:3 aspect ratio is standard normal PC monitors & Televisions.
16:9 aspect ratio is wide screen Television.
BNC
A bayonet type connector commonly used on video equipment.
CAM
Stands for Conditional Access Module. This is a device used in conjunction with a smart card to decrypt digital pay-TV services, such as BskyB. Some are built into the receivers whilst others take the form of plug-in cards. Most plug-in CAMs adhere to the Common Interface (Cl) standard.
Candela
The measurement used referring to brightness.
Colors
Displayable colors ie 16.77 million.
Coaxial Cable
Is a low noise cable in which the conductor is surrounded by a grounded braid. These types of cables are used to carry RF signals from TV aerials. They are also used with the electrical digital audio signal from DVD players.
Component Video
Also known as the 'YUV'. Comprises a luminance/sync channel (Y), plus two color 'difference' channels ('U' and 'V'). In terms of performance potential, only RGB comes close to component video.
Composite Video
Used by analogue transmitters, this signal combines luminance (brightness), synchronization and chrominance (color) components. It is not ideal because careful filtering is needed to separate the Y/sync and C information (however, note that modern TV's use a comb filter, which does a good job here). Superior pictures can be obtained by using S-video, RGB or component connections.
Contrast Ratio
This is the difference in light intensity between the brightest white and the darkest black.
dB
The dB rating of a speaker is simply a measure of it's efficiency, the higher the dB the more sound you get for a given input.
D-VHS
Stands for Digital VHS. D-VHS recorders can record a 'bit stream' from an IEEE1394 port. Current D-VHS VCRs record and playback analogue video, which is compressed using MPEG2.
DLP
Stands for Digital Light Processing. Is Texas Instruments' answer to the LCD, as used in many high-end video/data projectors. The DLP imaging device compromises thousands of microscopic 'mirrors', each representing a single pixel, which are angled towards (or away from) the light source to make the projected image darker or lighter. Three of these 'digital micromirror devices' (DMDs) are used for color. They are more efficient at transmitting light than LCD's, meaning they are brighter.
DNR
Stands for Digital Noise Reduction. Is a feature built into many TVs and VCRs, plus high-end DVD players, that seeks to reduce grain from tapes and terrestrial broadcasts received via imperfect aerials.
Dolby Surround
Is the early surround sound format derived from Dolby Stereo film sound and has now been eclipsed by Dolby Pro-Logic.
Dolby Pro-Logic
Is a four-channel surround sound system available from stereo TV broadcasts, VHS movies and most DVDs. It sends information to speakers at front left, front right, front center and two rear speakers which share a mono signal.
Dolby Pro-Logic II
Is a digitally implemented matrix decoding system designed to make the most of existing Dolby Stereo-encoded material. It will also generate simulated 5.1 surround sound from normal stereo recordings, as can DTS Neo:6.
Dolby Digital
Also known as Dolby Digital 5.1. Dolby Digital is a six-channel surround system found on many DVDs which sends discrete audio information to speakers at front left, front right, front center, rear left, rear right and a dedicated bass speaker, known as a 'subwoofer'. It is this bass (or LFE) channel which provides Dolby Digital 5.1, the '.1' part of it's name.
DTS
Stands for Digital Theater Surround. Is one of the two mainstream 5.1 multichannel audio systems in present use. Compared with Dolby Digital, it has a relatively low data compression rate, which makes some people believe that it sounds better. The majority of DTS releases are still Region 1 (NTSC), although there are an increasing number on Region 2 (PAL), including Gladiator, Ali and Hannibal.
DTS ES Discrete 6.1, DTS ES Matrix 6.1
Is a new 6.1-channel surround sound format. The extra channel is intended to drive one or more 'back surround', or center rear speakers located between the left and right rear ones. The sixth channel will be 'ignored' by regular 5.1 DTS decoders, hence the need for DTS ES Matrix 6.1. This format like Dolby Digital EX, encodes the back-surround channel via an analogue matrix, and delivers it via the rear channels.
DTS NEO: 6
Is a matrix decoding algorithm that generates simulated 6.1-channel sound from any two-channel source. Compare with Dolby Pro-Logic II.
DVD
Stands for Digital Versatile Disc. Is a high-density storage medium that can be used to store video (DVD-Video), audio (DVD-Audio) and computer data (DVD-ROM). Most DVD-Audio movies are single sided, dual-layer discs, with a capacity of 4.7GB.
DVI
Digital Visual Interface.
Electrical Digital Audio
Whereby Undecoded Dolby Digital and DTS soundtracks are transmitted from DVD decks to amplifiers in either optical or electrical form. Coaxial cables are used for the electrical signals.
HDCD
Stands for High-Density Compatible Digital. Is a relatively new concept as around only 4000 commercial HCDC titles are in circulation. The technology is set to be surpassed by new 'super-fi' standards like SACD and DVD-Audio.
HDTV
Stands for High-Definition television, with at lease double the number of lines of standard TV signals.
LCD
Stands for Liquid Crystal Display. Is a flat, lightweight display technology that consumes 40% less power that the cathode ray tube (CRT) found in most modern TVs. Is also used by many projection systems.
LFE
Stands for Low-Frequency Effects. Dolby Digital and DTS 5.1-channel soundtracks feature a channel (.1) devoted entirely to low bass sounds, ranging from 20Hz to 120Hz. If played via the subwoofer, LFEs add fullness and depth to soundtracks, with action movies in particular having a superior impact.
MPEG
Stands for Motion Picture Experts Group. Is a set of 'lossy' compression standards. With MPEG, information regarded as unimportant (i.e imperceptible to the viewer or listener) is irretrievably discarded by means of a highly complex mathematical process. The data rate is considerably reduced, though. MPEG1, as used on Video CDs, is a low bitrate variant capable of VHS quality. MPEG2 works at faster bitrates, and can yield high quality results-as demonstrated by DVD.
NICAM
Stands for Near Instantaneous Companding Audio Multiplex. Is the digital stereo audio system used for terrestrial analogue broadcasting in the UK (but not satellite).
NTSC
Stands for the National Television Standards Committee. Is a US-developed TV system employed principally in the US & Japan. It's typically combined with a 525-line picture and 30Hz frame rate.
Optical
Is a popular type of connector for interfacing audio equipment such as DVD players and Dolby Digital decoders. Electrical signals are converted by an LED at the 'transmitter' end, and passed via an intermediate fiber optic light guide, to a phototransistor built into the 'receiver'. The latter device converts the light back into an electrical signal. The main advantages of this system, also known as TOSlink (TOShibaLINK) are isolation and total immunity to interference.
PAL
Stands for Phase Alternate Line. Is a color TV system employed in the UK, Western Europe, China and Australia. Normally partnered with 625-line pictures and a 25Hz frame rate.
PDC
Stands for Program Delivery Control. If you enable ODC on your VCR and a 'flag' (command), issued by the broadcaster via teletext, when the desired program beings it tells your VCR to start recording. The VCR will only stop when the appropriate flag is received.
PIP
Picture In Picture
Pixel
A color controllable dot on a display screen.
Plasma
An electrically neutral, highly ionized gas composed of ions, electrons, and neutral particles. It is a phase of matter distinct from solids, liquids, and normal gases.
Progressive Scan
Is a superior way of viewing video images compared with the traditional interlaced method. With interlacing, the two fields of each video frame (the odd and the even horizontal lines) are shown one after the other. With progressive scanning all of the horizontal lines of the frame are displayed in one go.
The advantages are a lack of 'flicker' and jagged edges, typical of interlaced displays like CRT TVs, and also smooth horizontal resolution. A number of DVD players can output video progressively, although it is only officially available with NTSC material. The signal must be fed to a non-interlaced display such as a plasma screen, or LCD or DLP projector. Certain TV's also feature progressive scan (or deinterlacing). Such sets analyze the video signal and insert extra scanning lines to increase the apparent resolution (compare with 100Hz scanning).
Resolution
The number of pixels that make up a screen or display and with a computer fed Image or when presenting Images from say a digital camera, usually means the higher the resolution the sharper the Image. Higher resolution ie more than 852 x 480 on a plasma screen is of less Importance when connecting a video source.
RGB
Is a video transmission system that differentiates and processes all color information as separate red, green and blue channels. The best pictures from DVD are obtained using an RGB Scart connection or Component Video.
RS-232
A connection used for signaling devices.
Scart
Is a 21-pin AV connector which can carry composite, S-video and RGB video, plus stereo audio and widescreen/4:3 switching signals.
SECAM
Sequential Couleur avec Mémoire
The television broadcast standard in France, the Middle East, and most of Eastern Europe, SECAM broadcasts 819 lines of resolution per second. SECAM is one of three main television standards throughout the world.
Subwoofer
A passive subwoofer is a powerful bass loudspeaker, which stands alone in a box, needing a power amplifier in the equipment to which it is connected. The more common active subwoofer incorporates its own mains-powered amplifier, and takes a signal feed at low ('line) level.
S-video
Is a video transmission associated with high-band (eg Hi8 and S-VHS) video formats. The chrominance (C) and luminance (Y) components are transmitted separately.
SVGA
Stands for Super Video Graphics Array. Is a display resolution of 800 x 600 pixels, which compares roughly to the 720 x 486 of TV broadcasts.
THX
Cinema systems bearing the 'THX' logo comply with stringent performance parameters set by LucasFilm. Software can also be THX-approved. Two domestic variants also apply, THX Ultra, which applies to high-end home cinema equipment and THX Select, for midrange gear.
XGA
Stands for eXtended Graphics Array and has a display resolution of 1,024 x 768 pixels.
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