hash stringlengths 32 32 | doc_id stringlengths 7 13 | section stringlengths 3 121 | content stringlengths 0 2.2M |
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c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3 Adding service elements to an ensemble | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.1 Introduction | A service element is added to an ensemble that has not carried the service element before. A receiver shall create a new service list entry or maintain an existing service list entry. When a new service element is initially launched, there will usually be some promotion activity from the broadcaster, which may start so... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.2 Signalling | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.2.1 Preparation phase | For up to 28 days before the introduction of a service element into the ensemble, the broadcaster shall provide advance information by the use of FIG 0/20. The respective service label or service component label shall also be signalled. When a service with several service components is brought to life, each service com... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.2.2 Reconfiguration phase | During the six second period before the introduction of the service element into the ensemble, the broadcaster shall signal a reconfiguration. The necessary Next MCI for the service element shall be provided. The SCI shall be signalled as for the preparation phase. The respective service label or service component labe... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.2.3 Consolidation phase | There is no consolidation phase. ETSI ETSI TS 103 176 V2.5.1 (2026-02) 40 |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.3 Receiver behaviour | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.3.1 General | A receiver adds a new service to the service list typically when creating the service list or when it finds a new service element has been added to an ensemble that was previously tuned. In both cases the same set of rules applies. A service shall be added the service list when the full MCI is detected to identify a se... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.3.3.2 Response to signalling | When the receiver decodes the SCI with the Change flags set to 01, it is informed that a service element is to be added to the ensemble. When the P-T flag is set to 0 it indicates that a new service element will be added at the date-time indicated. The receiver should create a tentative service list entry with the info... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4 Removing service elements from an ensemble | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.1 Introduction | A service element is removed from one of several ensembles on which it is broadcast or it is removed from all ensembles. A receiver shall make sure it removes the associated service list entry unless it continues to receive the service element. When a service element will no longer be broadcast, then it shall be remove... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.2 Signalling | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.2.1 Preparation phase | For up to 28 days before the removal of the service element from the ensemble, the broadcaster shall provide advance information by the use of FIG 0/20. The fields of the SCI shall be used as follows: • The SId and SCIdS fields shall be used to identify the service element; when the SCIdS is 0 for the primary service c... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.2.2 Reconfiguration phase | During the six second period before the removal of the service element from the ensemble, the broadcaster shall signal a reconfiguration. The next MCI shall not include the service element that is being removed. The SCI shall be signalled as for the preparation phase. The service label or service component label shall ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.2.3 Consolidation phase | There is no consolidation phase for a temporary removal (P-T flag is set to 1) since the service element will resume later (see clause 6.3). After the reconfiguration has occurred for a permanent removal (P-T flag is set to 0), the broadcaster may provide confirmation information by the use of the SCI. It is recommende... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.3 Receiver behaviour | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.3.1 General | When a service element is removed from an ensemble this could affect the service presentation and the service list entry of the service component. When the selected service component is removed, the continuation of service is a primary concern. Reflecting a removed service component properly in the service list helps k... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.4.3.2 Response to signalling | When the receiver decodes the SCI with the Change flags set to 10, it is informed that a service element is to be removed from the tuned ensemble, but continues on other ensembles. When the receiver decodes the SCI with the Change flags set to 11, it is informed that a service element is to be removed from the tuned en... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5 Changing the identity or source of a service | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.1 Introduction | A service element undergoes a technical reconfiguration for administrative purposes. A service list entry shall not be modified. A receiver shall minimize any service disruption that may occur to the selected service element. When a service requires to change its Service Identifier (SId), usually due to regulatory reas... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.2 Signalling | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.2.1 Preparation phase | For up to 28 days before the change of SId or move of the service to another ensemble, the broadcaster shall provide advance information by the use of FIG 0/20. The fields of the SCI shall be used as follows: • The SId and SCIdS fields shall be used to identify the service. The SCIdS field is set to 0 since the change ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.2.2 Reconfiguration phase | During the six second period before the change to the SId of the service, or the service being removed from the ensemble, the broadcaster shall signal a reconfiguration. For a service that changes its SId, the next MCI shall not include the existing SId and shall include the new SId. For a service that is moving to ano... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.2.3 Consolidation phase | After the reconfiguration has occurred, the broadcaster may provide confirmation information by the use of FIG 0/20. For a service that has changed its SId, the current MCI shall be signalled using the new SId. For a service that has moved to another ensemble, no MCI will be present for the service. The SCI shall be si... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.3 Receiver behaviour | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.3.1 General | The evolution of broadcast networks may from time to time cause purely administrative changes to ensembles. A service may change its identity, but continue as the same programme. A service may be moved from one ensemble to another, thus changing transmit frequency and possible coverage area, but otherwise remain the sa... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.5.3.2 Response to signalling | When the receiver decodes the SCI with the Change flags set to 00, it is informed that a service will change its Service Identifier (SId) and/or move to another ensemble. The change will affect all service components of the service in the same way. This setting may occur in a variety of broadcast scenarios, determined ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.6 Changing the label of a service element | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.6.1 Introduction | For listeners, the service label or service component label is used to select the content they desire. Therefore, broadcasters should be very careful about changing these labels. Labels may be changed at any time and do not require a multiplex reconfiguration, but good practice is to retain the same label for as long a... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.6.2 Signalling | The new service label or service component label shall be signalled. No other changed signalling is needed. |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 6.6.3 Receiver behaviour | The receiver shall update the internal memory with new label information, when a changed label is detected (see clause 6.2.4). When an updated label has been detected all user controls shall be updated. When a receiver detects different labels for a single service element on different ensembles, only one service list e... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7 Announcements | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.1 Introduction | An announcement is a period of elevated interest within an audio programme. It is typically a spoken audio message, often with a lead-in and lead-out audio pattern (for example, a musical jingle). It may refer to various types of information such as traffic, news, sports and others. The signalling of announcements is t... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2 Signalling conventions | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.1 What is a cluster? | An announcement cluster is a group of services that share the same announcement target. Announcement support information defines to which clusters a service is a member. A service can be a member of up to seven clusters and a member of up to four OE clusters. Announcement switching information triggers an announcement ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.2 Management of Cluster Ids and OE Cluster Ids | A tuned ensemble announcement cluster is identified within an ensemble by a Cluster Id. An OE announcement cluster is identified within an ensemble by an OE Cluster Id. The Cluster Id (see ETSI EN 300 401 [1], clause 8.1.6.1) and OE Cluster Id (see ETSI EN 300 401 [1], clause 8.1.6.3) are only valid within the ensemble... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.3 Signalling announcement support | Announcement support (ASu) signalling in FIG 0/18 and FIG 0/25 declares that a service carries regular announcements of the supported types and defines an interruption authorization for that particular service. A service carrying ASu information may be interrupted only by announcements to the clusters it is a member of... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.4 Enabling alarms | It is recommended that EWS [i.2] is used in preference to alarm announcements. ETSI ETSI TS 103 176 V2.5.1 (2026-02) 49 Announcement support for alarms is signalled by setting the Alarm flag in FIG 0/0 to 1. This indicates that an ensemble will carry alarm announcements so that in the event of an emergency that affects... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.5 Signalling announcement switching | Announcement switching information triggers one announcement type for a single cluster of services. For any cluster, only one active announcement may be present at any one time. For any active announcement only one announcement type may be signalled, i.e. only one bit shall be set in the ASw flag field of FIG 0/19 (see... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.6 Announcement concurrency | A service may have several concurrent announcements signalled to it, via the clusters, at any time. Concurrent announcements shall occur on different clusters and shall use different announcement types. For any given cluster, only one announcement may be active at any time. Parallel announcements of different types sho... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.7 Synchronization requirements | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.7.1 General | As announcement switching information and the associated announcement occur on different transmission channels of a DAB ensemble, or even on different ensembles with differing latency, ensemble operators and broadcasters shall apply appropriate delay compensation between FIC and MSC and between FIC on different ensembl... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.7.2 User requirements | In principle, all delay compensation is to ensure the best user experience. Transmissions and receivers shall implement appropriate measures for this. Two conflicting problem cases shall be considered: • "Announcement truncation": a delayed start and a premature end of the announcement cut off parts of the announcement... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.7.3 Timing issues | In order to avoid "announcement truncation", the announcement switching signalling on the tuned ensemble shall lead the audio at the start of announcement by 1 second and it shall trail the audio at the end of the announcement by 1 second. If OE announcement switching signalling is provided for the same announcement, t... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.2.8 New flag | The New flag in the Announcement Switching (ASw) field (FIG 0/19) and the OE ASw field (FIG 0/26) shall be set to 1. |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3 Receiver response | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.1 Announcement mode | The announcement mode is a set of receiver functions that are collectively activated during an announcement. This may include various measures that improve audibility and comprehensibility of the audio announcement. The precise definition of this set of receiver functions is implementation dependent, except for the fol... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.2 Support for alarms | Support for tuned ensemble alarms in the receiver is mandatory, support for other ensemble alarms is optional. Functions of the announcement mode to achieve the best user experience with alarm audio messages are implementation dependent. |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.3 Monitoring the signalling | A receiver that supports announcements monitors the two-part signalling for announcement support and announcement switching with dedicated processes. The signal monitoring for regular announcements may be subject to the announcement function being activated by the user. Announcement support for alarms is signalled by t... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.4 Filtering of announcements | Receiver response to announcement switching information for regular announcements shall be subject to announcement support information for the selected service and may be subject to a user setting. The user may activate any of the announcement types that the receiver supports; in practice a user will turn on or off a p... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.5 Prioritization of announcements | As announcements may be signalled to different Cluster Ids or OE Cluster Ids concurrently, receivers shall perform prioritization. When an alarm announcement is detected, a receiver shall immediately terminate any ongoing regular announcement and switch to the signalled alarm announcement. A receiver shall not interrup... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.6 Target selection process | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.6.1 General | When the announcement mode is being activated for a regular announcement or for an alarm announcement the receiver performs a target selection process to identify the audio which carries the announcement message. For tuned ensemble announcements, the target, given in FIG 0/19, is a sub-channel in the tuned ensemble. Fo... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.6.2 Tuned ensemble announcements and alarms | On the tuned ensemble, the receiver finds the target sub-channel in the FIG 0/19, changes to the new sub-channel (if needed) and activates the announcement mode. If the sub-channel signalled in the FIG 0/19 corresponds to the sub-channel of the currently selected service then no change of sub-channel is needed for the ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.6.3 Other ensemble announcements | For OE regular announcements, the receiver resolves target ensemble and service component from FIG 0/25 and FIG 0/26 information respectively in the tuned ensemble. To identify available signals for the target ensemble, the receiver inspects pre-tuning memory and FIG 0/21 Frequency information, if available, to find a ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.6.4 Other ensemble alarms | For OE alarm announcements, only a target service component is provided in FIG 0/26. The receiver shall use OE Services information (FIG 0/24) to resolve a target ensemble for the announcement. If a target ensemble can be identified, a valid tuning frequency shall be found from Frequency information (FIG 0/21) and pre-... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.7 Terminating an announcement | An announcement is terminated when the received FIG 0/19 ASw flag field corresponding to the announcement is set to 0. The announcement mode shall be deactivated and the receiver shall restore the functional status and audio source from before the beginning of the announcement. NOTE: While the announcement is ongoing, ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.8 Performance aspects | Manufacturers shall ensure good synchronization between information received in the FIC and events occurring in the audio of the selected service. Receivers shall accurately account for an average time offset between FIC response and audio presentation; receivers that perform audio buffering are recommended to also acc... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.9 Audio codec and user application handling | FIG 0/19 only signals the sub-channel that carries the announcement. To determine whether the audio is coded as DAB audio or DAB+ audio it is necessary to find the SubChId in the FIG 0/2 MCI. If the announcement audio carries PAD applications (for example, dynamic label or SlideShow), or the service includes data servi... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.3.10 Interpretation of the 'New Flag' | Receivers shall ignore the New flag provided in FIG 0/19 and FIG 0/26. |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4 Tuned ensemble regular announcements | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.1 Introduction | A service provider signals that regular announcements, provided within the ensemble, may interrupt his service when certain conditions, identified by the announcement support information in FIG 0/18, are met. This is a permanent signalling. A service provider signals the presence of a regular announcement, with its par... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.2 Announcement support | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.2.1 Signalling | For every service in the ensemble one ASu field in FIG 0/18 may be present. It defines the announcement interruption privileges for the service. A service may have at most one ASu field present at any time. The SId field identifies the service; when the service has more than one audio service component, the announcemen... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.2.2 Receiver response | A receiver monitors the announcement support signalling for the selected service. The receiver shall discover changes to the announcement support information at least at one of the discovery points (see clause 6.2.4). At the time of announcement switching, the receiver shall respond according to the most recently detec... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.3 Announcement switching | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.3.1 Signalling | An audio message in the tuned ensemble is signalled by announcement switching information in FIG 0/19 so that receivers can activate an announcement mode to give it elevated significance. The announcement switching signalling shall be synchronized to the audio timing with delay compensation (see clause 7.2.7). The Clus... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.4.3.2 Receiver response | If announcement support for the selected service has been detected, the receiver shall monitor continuously the announcement switching information in FIG 0/19 for stored Cluster Ids so that an announcement is detected immediately. Upon detection of applicable ASw information, the receiver shall perform filtering of the... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5 Other ensemble regular announcements | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.1 Introduction | A service provider signals that regular announcements, provided in another ensemble, may interrupt his service when certain conditions, identified by the announcement support information in FIG 0/25, are met. This is a permanent signalling. ETSI ETSI TS 103 176 V2.5.1 (2026-02) 56 A service provider signals the presenc... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.2 Announcement support | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.2.1 Signalling | For every service in the ensemble one OE ASu field in FIG 0/25 may be present. It defines the OE announcement interruption privileges for the service. A service may have at most one OE ASu field present at any time. The SId field identifies the service; when the service has more than one audio service component, the an... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.2.2 Receiver response | A receiver monitors the OE announcement support information for the selected service. The receiver shall discover changes to the announcement support information at least at one of the discovery points (see clause 6.2.4). At the time of announcement switching the receiver shall respond according to the most recently de... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.3 Announcement switching | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.3.1 Signalling | An audio message on another ensemble is signalled by OE announcement switching information in FIG 0/26 so that receivers can retune to provide the audio message. The activation of the announcement mode depends on the signalling on the target ensemble. The announcement switching signalling on source and target ensembles... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.5.3.2 Receiver response | If OE announcement support for the selected service has been detected, the receiver shall monitor continuously the OE announcement switching information in FIG 0/26 for stored OE Cluster Ids so that an OE announcement is detected immediately. Upon detection of applicable ASw information, the receiver shall perform filt... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6 Tuned ensemble alarm announcements | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.1 Introduction | A ensemble provider signals that alarm announcements may interrupt all services in the ensemble by setting the Alarm flag in FIG 0/0. This is a permanent signalling. A service provider signals the presence of an alarm announcement using the announcement switching information in FIG 0/19 with the pre-defined alarm clust... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.2 Announcement support | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.2.1 Signalling of the Alarm flag | The setting of the Alarm flag in FIG 0/0 signals announcement support for all services in the ensemble. When the Alarm flag is set to 1 it is active and an alarm announcement may interrupt any service in the ensemble. |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.2.2 Receiver response | A receiver that detects an active Alarm flag in FIG 0/0 shall activate signal monitoring of FIG 0/19 for the special alarm cluster. A receiver shall detect a change to the state of the Alarm flag at least at one of the discovery points (see clause 6.2.4). At the time of an alarm announcement the receiver shall respond ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.3 Announcement switching | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.3.1 Signalling | An alarm message in the tuned ensemble is signalled by announcement switching information in FIG 0/19 so that receivers can activate the announcement mode to give it elevated significance. The announcement switching signalling shall be synchronized to the audio timing with delay compensation (see clause 7.2.7). The Clu... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.6.3.2 Receiver response | Once signal monitoring for alarm announcements has been activated, a receiver shall respond immediately to any ASw field that has the bit flag b0 set to 1 and the Cluster Id set to "1111 1111". Alarm announcements shall take precedence over any other announcement types. The response to alarm announcements shall not be ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7 Other ensemble alarm announcements | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.1 Introduction | A ensemble provider signals that alarm announcements may interrupt all services in the ensemble by setting the Alarm flag in FIG 0/0. This is a permanent signalling. A service provider signals the presence of an alarm announcement on another ensemble using the announcement switching information in FIG 0/26 with the pre... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.2 Announcement support | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.2.1 Signalling of the Alarm flag | The setting of the Alarm flag in FIG 0/0 signals announcement support for all services in the ensemble. When the Alarm flag is set to 1 it is active and an OE alarm announcement may interrupt any service in the ensemble. FIG 0/24 OE Services information (see clause 5.3) shall be signalled for target alarm announcements... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.2.2 Receiver response | A receiver that detects an active Alarm flag in FIG 0/0 shall activate signal monitoring of FIG 0/26 for the special alarm cluster. A receiver shall detect a change to the state of the Alarm flag at least at one of the discovery points (see clause 6.2.4). At the time of an alarm announcement the receiver shall respond ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.3 Announcement switching | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.3.1 Signalling | An alarm message on another ensemble is signalled by OE announcement switching information in FIG 0/26 so that receivers can retune to the target service. The activation of the announcement mode depends on the signalling on the target ensemble. The announcement switching signalling on source and target ensembles shall ... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 7.7.3.2 Receiver response | Once signal monitoring for alarm announcements has been activated, a receiver shall respond immediately to any OE ASw field that has the bit flag b0 set to 1 and the OE Cluster Id set to "1111 1111". Alarm announcements shall take precedence over any other announcement types. The response to OE alarm announcements shal... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8 Text labels | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.1 Introduction | The identification of available service elements for selection by the user is provided by the human readable SI labels, carried in the various extensions of FIG type 1 and FIG type 2. SI labels comprise all FIG type 1 and FIG type 2 labels: ensemble labels, programme service labels, service component labels, data servi... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.2 Unicode | Most scripts are written and read in a Left-To-Right (LTR) direction, whilst other scripts use a Right-To-Left (RTL) direction; examples are Latin (LTR) and Arabic (RTL). In order to deal with this situation, the Unicode standard [3] defines methods to determine which direction the text should be presented, and rules f... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.3 Text control field | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.3.1 Introduction | For non-Latin scripts, or text requirements which go beyond the coverage provided by the Complete EBU Latin-based repertoire character set (see ETSI TS 101 756 [2], annex C), the encoding that uses the fewest bytes to represent the label should be used, either UTF-8 or UTF-16. NOTE: UTF-16 is an extension of UCS-2, whi... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.3.2 Encoding of the text control field | The structure of the text control field is shown in figure 5. Base direction Contextual flag text control field 1 bit 1 bit b 2 b 1 Bidi flag 1 bit b 3 Combining flag 1 bit b 0 Figure 5: Structure of the text control field Bidi flag: this 1-bit flag shall indicate whether the label contains bidirectional text (excludin... |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.3.3 Transport of the text control field | |
c7c0df506814d94b4397027b2531f0f8 | 103 176 | 8.3.3.1 FIG type 2 labels | ETSI EN 300 401 [1], clause 5.2.2.3.1 defines the FIG type 2 extended label. As defined, FIG type 2 extended labels carry a flag field to allow the creation of a shortened label. Since this feature is no longer required, and the capacity of the FIC is limited, the Rfu bit that is present between the Segment index and E... |
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