Note of Video Broadcasting

Topics in Digital Video Broadcasting
Digital Video Broadcasting - Terrestrial

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Digital Video Broadcasting Terrestrial
MPEG-2 Transport Streams

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Extended Event Descriptor under EIT
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Tag value = 0x4E provides a detailed text description of an event may be used in addition to the short event descriptor possible to have more than one extended event descriptor text information can be (itemized) structured into two columns
- item description field (item)
- the item text
 application: cast list
 e.g. Produce: Name of Producer
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Extended Event Descriptor under EIT
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descriptor_number : the number of the descriptor
- the number of first extended_event_descriptor shall be set to 0x00
- the number for the additional ones shall be incremented by 1 last_descriptor_number : specifies the number of the last extended_event_descriptor length_of_items: the length in bytes of the following items
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Extended Event Descriptor under EIT
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item_description_length: specifies the length in bytes of the item description *item_description_char : specify the item description item_length: the length in bytes of the item text
*item_char : specify the item text text_length: specifies the length in bytes of the non itemized extended text *text_char : specify the non itemized extended text
* coding again conforms to EN
300368 Annex A
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Frequency List descriptor under NIT
0x62
may be used in the NIT
- other_frequency_flag being set
- a complete list of additional frequencies for a certain multiplex which is transmitted on multiple frequencies coding_type: indicates how the frequency is coded and relates to the delivery system used centre_frequency: list of frequencies

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Linkage Descriptor under NIT/BAT/SDT/EIT
Tag value = 0x4A identifies a service that can be presented if the consumer requests for additional information related to a