Philips 14AA3322/40B Installationsanleitung PDF herunterladen (Seite 11)

Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal

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9. Document body:

In the first part of the document body we will focus on the correction of the exercises. The

procedure followed to conduct the experiments was very specific. We had to follow exactly the

same procedure as the students are going to do and use the same devices that they will have in

their disposal. The results that we wanted to have were to check if the experiments were

functioning as they should, were well focused to their purpose of understanding the digital

television, were sufficiently carried out by a student and the instructions were enough that the

students could follow them.

In the second part you can find the process of creating a transport stream out of an analog

signal. During this process, an analog signal created by a colour television pattern generator is

driven using special equipment to the computer. There it is converted in digital signal in “.mpg”

form and transformed in a transport stream that is broadcasted through the laboratory

television network.

In the third part is the whole, detailed procedure of the creation of a multiplexed transport

stream. It starts from the first stages of searching, installing, understanding and getting familiar

with the software and it goes step by step through the last stage that was the creation of a

multiplexed transport stream and broadcasting it in the laboratory environment through the

internal television network.

9.1 From analog video to the multiplexed transport stream:

9.1.1 Analog video:

Analog video is a video signal transferred by an analog signal. An analog color video signal

contains luminance, brightness (Y) and chrominance (C) of an analog television image. When

combined into one channel, it is called composite video. We can liken the analog video with the

human eye. When the eye receives an image hundreds of thousands of fibres send the signal to

the brain at the same time, to represent the whole scene. In analog television, when a camera

captures the image, an electrical signal is formed to represent the changing brightness and

colour of each part. This signal is sent to the monitor through a single channel. There, the signal

is transformed back into light and the image is assembled on the viewing screen in its proper

position. This last part it the analog video. In black and white television we can have every value

from black till white and every possible value in between (grey).

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Philips 14AA3322/40B Installationsanleitung Seite 11