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Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal
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7. Glossary:
Attenuator: Is an electronic device that reduces the power of a signal without noticeably
distorting its waveform. An attenuator is effectively the opposite of an amplifier. While an
amplifier provides gain, an attenuator provides loss.
Blog: A blog is a discussion or informational site published on the internet and consisting of
discrete entries typically displayed in reverse chronological order.
Code rate: The code rate of a forward error correction code is the proportion of the data-
stream that is useful. For example, if the code rate is x/n, for every x bits of useful information,
the coder generates totally n bits of data, of which x-n are redundant.
Constellation: Constellation in electronics is an area where a lot of dots or marks are present.
More detailed, a constellation diagram is a representation of a signal modulated by a digital
modulation scheme such as quadrature amplitude modulation (QAM) or phase-shift keying
(PSK). It displays the signal as a two-dimensional scatter diagram in the complex plane at
symbol sampling instants. In a more abstract sense, it represents the possible symbols that may
be selected by a given modulation scheme as points in the complex plane. Measured
constellation diagrams can be used to recognize the type of interference and distortion in a
signal.
DOS: DOS (Disk Operating System) is the command terminal where someone can control their
computer by typing and executing commands in the window command line.
Forum: An Internet forum, or message board, is an online discussion site where people can hold
conversations in the form of posted messages. Depending on the access level of a user or the
forum set-up, a posted message might need to be approved by a moderator before it becomes
visible. Forums have a specific set of jargon associated with them. For example a single
conversation is called a "thread", or topic. A discussion forum is hierarchical or tree-like in
structure: a forum can contain a number of subforums, each of which may have several topics.
Within a forum's topic, each new discussion started is called a thread, and can be replied by as
many people as so wish. Depending on the forum's settings, users can be anonymous or have to
register with the forum and then subsequently log in, in order to post messages. On most
forums, users do not have to log in to read existing messages.
Guard interval: Guard intervals are used to ensure that distinct transmissions do not interfere
with one another. These transmissions may belong to different users or to the same user. The
purpose of guard interval is to introduce immunity to propagation delays, echoes and
reflections, to which digital data is normally very sensitive.
Transport stream: It is a format for transmission of audio and video data and is capable of
carrying multiple programs. Usually it is used for terrestrial and satellite broadcasts.
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- 5. Table of contents: 6
- 6. List of abbreviations: 7
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- 7. Glossary: 9
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- 10 List of figures: 80
- 11. List of illustrations: 80
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- 12. Bibliography 82
- TS-Reader Exercise 83
- Figure 2.5: VLC Snapshot 88
- Figure 2.10: Mux Usage Chart 95
- Which is the bandwidth of 99
- Figure 3.4: PID Usage chart 100
- DekTec DTU-235 Exercise 101
- Figure 1.4: Spectrum Detail 106
- Figure 1.6: Record Tab 108
- 2.StreamXpert 109
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- Figure 2.5: Tables of the TS 113
- Figure 2.6: 115
- PID Grid 115
- Figure 2.7: PCR tab 116
- DTA-115 EXERCISE 117
- Figure 1: Antenna attenuator 118
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