Analogue is the way our television is transmitted and recorded now. It is called analogue because the electrical signal voltages 'represent' the picture and sound signals rather than being coded into a series of '1's and '0's, which is the way digital TV works.
The broadcast signal which delivers just five TV channels* to your set via the aerial.*Not including other services and regional variations.
Television material is transmitted at certain frequencies, but in fact spreads a little either side of the frequency. The amount it can spread is called the bandwidth. With digital, the greater the bandwidth, the faster the material can travel. This means that data such as the EPG (Electronic Programme Guide) or Teletext can appear on your screen faster, or picture and sound can be of a higher quality because the bandwidth can contain more information.
The areas that can receive digital television - you can check whether you are in digital TV coverage using the postcode database.
Digital Audio Broadcasting – the DAB service is radio’s equivalent of digital TV. It gives interference-free reception and has room for extra stations as well as all the usual ones. It is available over most of the country. You can receive DAB on personal, portable, tabletop or car radios. Digital radio stations are also received by digital TV set-top boxes and iDTVs (Integrated Digital Television). Digital switchover does not affect radio services.
Television images are sent as compressed data which is then unscrambled by a digital box. The signal is sent by cable, satellite or through the air to your aerial.
Needed for watching digital TV - it unscrambles digital signals and turns them back into sound and pictures.
The process of switching over the UK’s current analogue television broadcasting system to digital, as well as ensuring that people have adapted or upgraded their televisions and recording equipment to receive digital TV.
Abbreviation for digital switchover by the broadcasters – from analogue to digital.
DTT or DTTV
Digital terrestrial television transmitted through an aerial. In the UK this includes the Freeview service (which includes the traditional terrestrial channels, BBC One, BBC Two, ITV1, Channel 4 and Five) and for an additional monthly subscription, Top Up TV.
Abbreviation for digital television.
Digital Versatile Disc – though they may all look the same, DVD discs come in many forms (hence the word versatile). The most popular (usually simply referred to as DVDs) are discs containing pre-recorded films, concerts or music videos. Other formats include DVD +/-R, DVD +/-RW and DVD-RAMs, which can be used at home to record TV programmes or computer files.
Electronic Programme Guide – an on-screen listing of TV channels and programmes. You can use one to go to the programme you want, or to select something to record.
The main UK digital terrestrial television service that is transmitted through an aerial. No subscription is required. See also Top Up TV.
This is a freeview system using a sky receiver and a card with a one off payment to Sky.
Freesat from BBC / ITV
This is a system using a satellite dish and receiver for freeview no fees payable only your install and box price.
Free-to-air – a programme or service that you don’t need a subscription to get.
High Definition Television is a new technology that will enable viewers to get higher definition television pictures. HDTV has four times as many pixels (dots on the screen) as standard TV broadcasts, meaning a clearer picture and stunning detail on large-screen TVs. An HD-ready TV is not necessarily a digital TV. Make sure that it carries the digital ‘tick’ logo, or get a digital box, to ensure that you are set for digital.
Integrated Digital Television - a TV with a built-in digital receiver which lets you receive Freeview channels through your aerial with no need for an additional digital box. It can refer to either a conventional CRT TV or one of the new flat panel TVs.
Liquid Crystal Display. This is a particular type of flat panel television that is becoming popular as a replacement for conventional CRT TVs. They tend to be used most often for screen sizes up to 32” and can be suitable for displaying HDTV. See also Plasma.
Master Antennae TV. A communal aerial system that uses a master aerial to receive the signal before it is distributed.
An additional one-off payment for particular films and sporting events on satellite or cable/broadband television.
One of the thousands of tiny dots that make up the picture on a TV
A particular type of flat panel TV (see also CRT and LCD). They are becoming popular for larger screen TVs (such as 42”) and can be suitable for displaying HDTV.
A way of delivering or receiving digital television. Typical platforms are terrestrial, cable, satellite and the internet.
The red button on your remote control for selecting Teletext and other interactive television services.
A television aerial on the roof of your house.
A way of connecting one TV product to another. It connects the picture and stereo sound in one 21-pin plug. Usually used to connect a television with a video or a digital box.
An aerial on top of your TV.
The electromagnetic spectrum is the set of radio frequencies used to transmit television, radio and other forms of electronic communication.
Set-top box. See Digital box.
See Digital switchover.
TV transmissions – analogue or digital - that are broadcast over the air directly to your TV aerial.
Top Up TV
You pay this company for extra channels and programmes on digital terrestrial television. For this to work, your digital TV equipment must have a slot or hole to take the Top Up TV viewing card.
Video cassette recorder – the machine you have probably been recording and playing tape copies of programmes with for years. It can be used to record analogue or digital TV but records the video signal in fairly low analogue quality.
The ratio of the width to the height of the TV picture is 16 to 9, often called 16:9 format. Nearly all major TV channels now make and broadcast their programmes in this widescreen format. Older programmes were in the narrower 4:3 format. If set up correctly, your TV and set-top box should display the picture on your screen in 16:9 or 4:3 as appropriate for the programme.
A 10 Percent discount on works, not parts, can be obtained on the completion of any works by quoting the keywords "Communication must go on" to the engineers before commencement of any works.
This is partially due to our pursuit of cheap communications on the planet and also due to the credit crunch at the same time the digital changeover is planned.
All the best from the A & S Team
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