Our report on HDTV was the second part of our series about the changing face of broadcast technology.

In the first of our series, we looked at digital television, something that will affect us all when programmes are no longer transmitted on analogue.

On Wednesday we turned our attention to high definition television - or HDTV - and that will dramatically improve the quality of sound and pictures.

Wednesday on Breakfast:

Susannah Streeter reported live from Belfast at the first BBC News and Sport on Tour event.

She took the opportunity to find out about the BBC's new High Definition services, which launch today.

Simple guide to high definition television

What is high definition television?

In simple terms, high definition television signals send out more information to your television set allowing clearer, sharper and more colourful pictures; as well as higher quality sound.

Known as HDTV, it's basically a new format for broadcasting pictures. While normal TV screens have around half a million pixels, HD sets can have as many as two million - which makes for a much sharper picture.

Will I need a special television?

Yes, you will need a television that is described as 'HD ready'

The HD ready logo, shows that new equipment will be compatible

If you're thinking of buying a new television set, or other equipment, you will need to look out for the logo shown on the right hand side of this page.

The cheapest HD TVs start at around �500, HD ready televisions will have all the necessary connectors but will need to be linked to compatible equipment such as DVD machines.

Will everyone be able to receive HDTV pictures?

No you will need one of the compatible digital 'platforms'; for example digital cable or satellite - so you will need to have an HD set top box.

At the moment it's not known whether you will be able to receive HDTV via Freeview because there is no room available on Freeview for HD channels, at least until the digital switchover takes place.

Also, an existing digital Sky box will not be able to receive HD, you should contact your main service provider before investing in a new television as you may have to spend more to upgrade your receiver.

Will I still be able to see TV pictures in the existing format?

Yes, you won't be forced to upgrade to HD, and pictures in the existing format should continue for many years.

For a more comprehensive guide, follow the links to the specialist BBC websites