Topics in Digital Video Broadcasting
Digital Video Broadcasting - Terrestrial

1

Digital Video Broadcasting Terrestrial
MPEG-2 Transport Streams

2

Extended Event Descriptor under EIT







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
3

Extended Event Descriptor under EIT






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
4

Extended Event Descriptor under EIT










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
5

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








6

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 specific entity described by the SI system
can be under different tables:
- under NIT  point to a service providing additional information on the network
- under BAT  provide a link to a service informing about the bouquet
- etc
A CA replacement service: selected automatically by a receiver if the CA denies access to the specific entity described by the SI system
A service replacement service: replacement service may be selected automatically by a receiver when the running status of the current service is set to "not_running"










7

Linkage Descriptor under NIT/BAT/SDT/EIT
A service to which a mobile receiver might: the service
may be selected automatically by a receiver when the
actual service is no longer receivable under its service_id
- the hand-over_type identifies whether the
linkage_descriptor links to the same service in a different
country, to a local variation of the service or an
associated service
Two events can be signalled as equivalent using: the event
being linked to may be a simulcast or may be time offset
- the event_simulcast flag shall only be set if the target
event is higher quality (Application: PVR)





8

Linkage Descriptor under NIT/BAT/SDT/EIT










transport_stream_id: identifies the TS
containing the information service
indicated
original_network_id: gives the label
identifying the network_id of the
originating delivery system of the
information service indicated
service_id: identifies an information
service within a TS
- The service_id = the program_number
in the corresponding
program_map_section
- If the linkage_type field has the value
0x04, then the service_id field is not
relevant, and shall be set to 0x0000
(TS containing complete
Network/Bouquet SI)
linkage_type: the type of linkage
hand-over_type: the type of hand-over
9

Linkage Descriptor - linkage_type

10

Linkage Descriptor under NIT/BAT/SDT/EIT








origin_type: specifies in
which table the link is
originated
network_id: identifies the
terrestrial network that
supports the service indicated
initial_service_id: identifies
the service for which the
hand-over linkage is valid
target_event_id: identifies
the event_id of the event (the
target event)
- carried on the service
defined by the ONID, TSID
and SID
11

Linkage Descriptor under NIT/BAT/SDT/EIT






target_listed: signals whether the service defined
by the ONID, TSID and SID is included in the
SDT carried in that TS
- = “1”  the service shall be included in the
SDT
- = “0”  the following conditions shall be met:
1. the service_type for the service shall be 0x19
(advanced codec HD digital television service) if
the events are simulcast, otherwise the
service_type shall be the same as for the service
where the source event is carried
2. EITp/f information shall be available for the
service in that TS
3. the service shall be running
event_simulcast:
- “1”: the target event and the source event are
being simulcast
- “0”: the events are offset in time
private_data_byte: the value of which is privately
defined
12

Parental Rating Descriptor under EIT




Tag value = 0x55
country_code: sim...

-2 0 0000 0x00 0x0000 0x01 0x02 0x03 0x04 0x06 0x07 0x0e 0x0f 0x10 0x11 0x14 0x16 0x18 0x19 0x20 0x24 0x2c 0x48 0x4a 0x4e 0x55 0x56 0x59 0x60 0x62 0x74 0x78 0xa3 0xae 0xbd 0xc4 0xd0 0xe4 0xe8 0xff 1 10 1011 11 1101 111 1111 12 13 14 15 16 17 18 19 1st 2 20 21 22 23 24 25 256 26 27 28 29 2nd 3 30 300 300368 31 32 33 34 35 36 37 38 39 4 40 41 42 43 44 45 46 47 472 48 49 5 50 51 52 53 54 55 56 57 576 58 59 6 7 706 720 743 8 9 abl absenc access accord accuraci acquisit across activ actual ad addit address adjac advanc age agreement align allow also alway analysi ancillari ancillary-pag annex anoth applic appropri area arrang ascend aspect assign associ assum attribut automat avail avoid background bandwidth base basic bat belong bit bitmap block bottom bouquet british broadcast build byte ca call carri case cast ceas centr certain chang char charact characterist clut clut-id code codec colour colour-look-up-t column commenc common complet compon compos composit composition-pag compress concept concern condit conform consecut consum contain content control convey correspond countri creat current data dds declar decod default defin definit deliveri deni depend depth describ descript descriptor detail differ digit direct display distinguish dvb dynam e.g ebu edg effici eg eit either eitp/f element elementari en encod end enough entir entiti entri epoch equal equival eras et etc etsi event ever exampl exist explicit express extend extens famili field fill first fix flag follow format found frame frequenc full futur gamut general generat give given glyph glɪf graphic hand hand-ov hd hdtv hdtv-specif header hear height hierarchi higher horizont i.e icon id identif identifi ignor imag immedi impair includ inclus increas increment index indic inform initi insert instanc instead intend introduct item ker label languag last least left left-hand left-most lefthand legaci length level limit line link linkag list littl local locat logo long longer look loop m magazin make mani manufactur map mar maximum may mean mechan memori met might minimum minus miscellan mobil mode modifi modulo move mpeg multipl multiplex n name nbit need network network/bouquet new nit nit/bat/sdt/eit non non-zero note number object occur of-display-set offset old one onid onto oper option order origin orremov otherwis overlaid overlap overview packet page parent pariti part payload per period permit pes pid pixel place pmt point posit possibl preced prefix present prioriti privat process produc program provid psi pts ptss pvr qualiti random rang rate ratio receiv recept recommend rectangular redefin refer referenc refresh region relat relev remain remov render replac represent request requir reserv resid respect result right right-hand rom run run-length runlength scan scheme screen sd sd-on sdt second section segment select semant sentenc separ sequenc servic set sever shall share short shown si sid signal similar simulcast singl size smaller sound sourc spatial specif specifi split standard start state status stream string structur stuf subtitl subtitles/subtitle suitabl summari support sync synchron syntact syntax system tabl tag target teletext televis tell tempor terminolog terrestri text time time-out top topic track trade trade-off transcod transmiss transmit transpar transport true ts tsid tss two type unit updat upon upper use user valid valu variat vbi version vertic video viewer way whether while-loop width window within word year zero