Analogue TV Broadcasting |
||||
|
The work of ETSI in analogue TV broadcasting covers standards for transmitting equipment, and also enhancements to analogue TV broadcasting systems. Analogue Television Broadcast Transmitting equipmentETSI has developed Harmonized Standards enabling analogue television broadcasting transmitters to be placed on the market under the R&TTE Directive
Standards for safety are available from CENELEC, with input from ETSI (see Safety) Relevant Technical Body: ERM TG17 Analogue Television systemsETSI has produced number of standards and associated codes of practice for enhancements to analogue TV broadcasting systems. More recent work of television systems has concentrated on Digital Television Broadcasting Programme Delivery Control (PDC)
ETS 300 231: Specification of the domestic video Programme Delivery
Control (PDC) system This register contains the so-far allocated values of the Network Identification (NI) field of the Teletext Broadcast Service Data packet (extension data packet of type 8/30 format 1), and the CNI fields of the PDC data packets (extension data packets X/26 and 8/30 format 2). The document also contains identification codes related to VPS CNI, which apply to German, Austrian and Swiss TV programme providers. Services like Teletext, PDC or VPS that contain NI data in their formats may be used (besides their primary purpose) also as a reference for a source display or for Automatic Tuning Systems (ATS). The master version of TR 101 231 exists as a living document on the EBU Web site and for registering a new code, please contact the EBU Technical Department . Electronic Programme Guide (EPG) or TV Guide
ETS 300 707: Electronic Programme Guide (EPG);
Protocol for a TV Guide using electronic data transmission; is an application of
Electronic Data Transmission (EDT) within analogue TV transmissions. The
transport mechanism is Teletext (see ETS 300 706). The data transmission within
Teletext (Coding) is covered by ETS 300 708. The data required for these
applications is transmitted by means of a data broadcasting protocol using the
Vertical Blanking Interval (VBI) lines of a TV signal. The EPG enables a
receiver/decoder to store a programme database (and, if available, a navigation
database), which can help the viewer to find the programmes of his preference.
Enhanced Teletext
ETS 300 706: Enhanced Teletext
specification, a data delivery system within television transmission which
defines the application of CCIR Teletext System B to CCIR 625 Line 50 field
Television Systems B, D, G, H, I, K and L. The System is optimized for broadcast
media using cable, terrestrial and satellite transmission and the associated
service and product environment. Coding for Arabic, Cyrillic, Greek, Hebrew and
Latin alphabets is included. Where appropriate the character repertoires and
coding structures of the ISO are used. Four presentation Levels are defined:
Level 1: - Alphamosaic characters, Level 1.5: - Extends the character
repertoire, Level 2.5: - Extends the language repertoire, Level 3.5: - Extends
the number of re-definable characters and their complexity. PALplus ETS 300 731: Enhanced 625-line Phased Alternate Line (PAL) television; PALplus is an enhanced 625-line PAL transmission system allowing broadcasting of 16:9 wide-screen pictures with greatly reduced levels of conventional PAL artifacts, whilst retaining a high level of compatibility with existing PAL transmission infrastructure and receivers. Ghost Cancellation Reference (GCR) ETS 300 732: Enhanced 625-line PAL/SECAM television; Ghost Cancellation Reference (GCR) signals which may be used by special receivers to remove or reduce ghosting on the received picture. Use of the Line 318 GCR signal as defined in ITU-R BT.1124 for application in Europe. Wide Screen Signalling (WSS) EN 300 294: 625-line television Wide Screen Signaling (WSS) specification for terrestrial TV services (PAL, SECAM, PALplus); wide screen letterbox Near-Instantaneous Companded Audio Multiplex (NICAM) EN 300 163 : Near-Instantaneous Companded Audio Multiplex (NICAM) transmission of two-channel digital sound with terrestrial television systems B, G, H, I, K1 and L. NICAM provides analogue terrestrial television systems (PAL, SECAM) with two high-quality digital sound channels and a small amount of additional data capacity. Either two independent mono or a single stereo signal may be transmitted. Alternatively, one or both sound channels may be used for transparent transmission of data. Packet distribution systems
ETS 300 250: Specification of the Multiplexed Analogue Components D2-MAC/Packet
system Relevant Technical Body: Broadcast (Joint Committee with EBU, CENELEC and ETSI)
|
