Philips 14AA3322/40B Guía de instalación Pagina 12

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Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal
12 | P a g e
Image 9.1.1.1: Black & white and colour television waveform.
In colour television there are three colours. The red, green and blue (also known as RGB). In
order to form an image in black and white there are two states. When electrons are emitted it
means that the spot is white and when not, it is black. In this way and scanning the screen from
top to bottom with high speed, the image is formed and the black and white video is created. In
colour video the progress differs a bit. There are three states. The red, green and blue. Each of
these states is formed by an electron gun. Each gun represents a different colour. When a gun
emits the proportionate colour appears. If we want to form a different colour from these three
there are two or all the three guns emitting at the same time so, the combination can give us
the desired colour.
Image 9.1.1.2: Representation of an RGB image.
There were three systems used in the world for analog colour television. The PAL, the SECAM
and the NTCS. The PAL was the system used in Europe and in the most of the world. PAL stands
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