Standard
Track updates
AS 4933:2024
[Current]Digital television - Requirements for receivers for VHF/UHF DVB-T television broadcasts including ancillary services
AS 4933:2024 specifies the requirements for equipment used in Australia for the reception of free-to-air (FTA) terrestrial VHF/UHF DVB-T broadcast television
Published: 15/11/2024
Pages: 85
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Application
1.2.1 General
1.2.2 Application to baseline television receivers
1.2.3 Application of appendices
1.3 Normative references
1.4 Terms and definitions
2 Minimum requirements for receivers
2.1 Introduction
2.2 Minimum receiver requirements
3 Receiver features
3.1 General
3.2 Terrestrial reception
3.2.1 DVB-T receivers
3.2.2 Decoding service format types
3.2.3 Capability of receiving analogue PAL-B transmissions
3.2.4 Advisory: Australian regulatory and safety requirements
3.2.4.1 General
3.2.4.2 Electrical safety
3.2.4.2.1 General
3.2.4.2.2 Mains voltage
3.2.4.2.3 Touch current
3.2.4.3 Electromagnetic Compatibility (EMC) and other ACMA regulations
3.2.4.4 Minimum Energy Performance Standards (MEPS)
3.3 Power on operations
3.3.1 First-time operation initialization
3.3.2 Subsequent switch on
3.4 User operation
3.4.1 Operating system
3.4.2 Receiver diagnostics and reset
3.4.3 Tuner functionality
3.4.3.1 Scanning to find services
3.4.3.2 Use TPS for transmission discovery
3.4.3.3 Manual entry of tuning details
3.4.3.4 Automatic detection of new or changed services
3.4.4 Assigning numbers to services and navigation
3.4.4.1 Logical Channel Numbering (LCN)
3.4.4.2 Services without LCNs
3.4.4.3 Duplicated LCNs
3.4.4.4 Finding duplicate LCNs
3.4.4.5 Follow broadcaster service changes
3.4.4.6 Linkage descriptor
3.4.4.7 Response to service changes — PSI and SI updates
3.4.5 Electronic Program Guide (EPG)
3.4.5.1 General
3.4.5.2 Use of EITschedule-program information
3.4.6 I-plate (information banner), OSD and navigation using EITp/f actual
3.4.6.1 General
3.4.6.2 Character set
3.4.6.3 Icons for special features
3.4.6.4 Parental guidance rating in the I-Plate
3.4.7 Signal strength and quality indicator
3.4.8 Selection of radio services
3.4.9 Service unavailable — On-screen service
3.4.9.1 Poor or no RF signal
3.4.9.2 Service selected that has no content or is “not running”
3.4.9.3 Incompatible service selected
3.4.10 User navigation
3.4.10.1 Basic navigation
3.4.10.2 Display of Closed Captions (CCs)
3.4.10.3 Selection of audio description services
3.4.10.4 Aspect ratio control (Optional)
3.5 RF performance, COFDM demodulation and channel decoding
3.5.1 General
3.5.2 RF performance
3.5.2.1 7 MHz transmission channel bandwidth
3.5.2.2 RF input channel loading allowance
3.5.2.3 Receiver sensitivity
3.5.2.4 Digital terrestrial receiver tuner’s frequency range
3.5.2.5 Channel offsets
3.5.2.6 Operation in Single Frequency Network (SFN) environment
3.5.2.7 Interference immunity — Impulse noise rejection
3.5.2.8 Immunity to DVB-T/-T2 signals in other channels
3.5.2.9 Definition of Quasi Error Free
3.5.2.10 Immunity to 700 MHz LTE signals in other channels
3.5.3 DVB-T COFDM transmission parameters
3.5.3.1 General
3.5.3.2 Change in COFDM transmission parameters — Acquisition time
3.5.3.3 Reception of DVB-T Hierarchical Modulation transmissions
3.6 Multiplex and transport stream
3.7 Processing Program-Specific Information (PSI) and Service Information (SI)
3.7.1 Interpretations of SI variations for Australia
3.7.2 Interpretation of MPEG, DVB mandatory and DVB optional tables
3.7.2.1 General
3.7.2.2 Application Information Table (AIT)
3.7.2.3 Content Reference Identifier (CRID)
3.7.2.4 Default Authority Descriptor (DAD)
3.7.3 Interpretation of other descriptors
3.7.4 Interpretation of Time and Date Time-Offset Tables (Australian variation)
3.7.4.1 General
3.7.4.2 Informative notes on Time-Offset Tables
3.7.5 Content descriptors (Australian variation from ETSI EN 300 468)
3.7.6 Radio services
3.7.7 Australian use of original_network_ids and network_ids
3.7.7.1 General
3.7.7.2 Original_network_ids
3.7.7.3 Network_ids
3.8 Video decode and display
3.8.1 General
3.8.2 MPEG-2 and −4 Part 10 video decoding
3.8.2.1 Decode SD MP@ML video formats
3.8.2.2 Decode HD MP@HL video formats
3.8.2.3 Decoding of MPEG-4 Part 10 AVC
3.8.3 HEVC decoding
3.8.4 Picture colorimetry and gamma
3.8.4.1 Chroma_format
3.8.4.2 Colorimetry and gamma
3.8.5 Reaction to reception of video formats not supported by the receiver
3.8.6 Video digital output formats
3.8.6.1 Output video signal formats
3.8.6.2 Digital output on HDMI
3.8.6.3 Reproduction of progressive scan video formats
3.8.7 Picture format scaling for display
3.8.7.1 Picture overscan
3.8.7.2 Choice of displayed picture aspect ratio
3.8.7.3 Accommodating 16:9 and 4:3 displays
3.8.7.4 Picture shape change via user navigation
3.8.7.5 Identification of 4:3 and 16:9 pictures
3.8.8 Other MPEG video presentation features
3.9 Audio — Decoding
3.9.1 Audio outputs
3.9.2 MPEG audio
3.9.2.1 Decode audio MPEG-1 Layer II streams
3.9.2.2 Decode all MPEG-1 Layer II sampling rates
3.9.2.3 Ability to decode MPEG-2 audio formats
3.9.2.4 MPEG-1 Layer II outputs
3.9.3 AC-3: Decoding and output
3.9.3.1 Decode AC-3 audio streams
3.9.3.2 Decodable AC-3 sampling frequency range
3.9.3.3 Decodable AC-3 bit-rate range
3.9.3.4 Recognition of AC-3 in a DVB MPEG Transport Stream
3.9.3.5 AC-3 audio outputs
3.9.4 HE AAC audio: Decoding and output
3.9.4.1 Decode HE AAC audio streams
3.9.4.2 HE AAC outputs
3.9.5 Audio identification and control
3.9.5.1 General
3.9.5.2 Identifying which audio streams are present
3.9.5.3 User access to other audio streams (including one or more other languages)
3.9.5.4 Switching between program services with different audio formats
3.9.5.5 Ability to present stereo audio encoded with surround information suitable for external surround sound decoding
3.9.5.6 System audio reference level
3.9.5.7 System audio output level
3.9.5.8 Audio levels and loudness
3.9.5.9 Maximum picture-sound timing misalignment
3.9.5.10 Audio Description
3.10 Operating software and enhanced functionality
3.10.1 API
3.10.2 Hybrid Broadcast Broadband TV (HbbTV)
3.10.3 MHEG-5
3.10.4 Program services delivered by IP
3.11 Subtitles including Closed Captions (CCs) carried in a Teletext format
3.11.1 General requirements for decoding and display of teletext Closed Captions
3.11.2 Support of teletext data services
3.11.3 Decoding of teletext Closed Captions from an MPEG Transport Stream
3.11.4 Viewer access to Closed Captions
3.11.5 Notes on decoding Closed Caption data
3.11.6 Positioning of Closed Captions over displayed picture
3.11.7 Choice of Closed Caption character font
3.11.8 Time accuracy of Closed Captions
3.11.9 Closed Caption teletext reinsertion on VBI of analogue PAL SD output (applies to STBs)
3.11.10 Bit-mapped subtitles
3.11.11 Access to data service
3.12 Data broadcasting (broadcast television related)
3.13 Parental guidance
3.13.1 Decoding of parental guidance ratings codes
3.13.2 Display of parental guidance rating
3.13.3 Parental guidance program lock-out
3.14 Conditional access, content protection and copy management (CPCM)
3.14.1 Conditional access options
3.14.2 Content protection systems
3.14.3 Description and use
3.14.3.1 General
3.14.3.2 Digital HDMI outputs
3.14.3.3 HD analogue outputs
3.14.3.4 SD analogue outputs
3.15 Interfaces and connectors
3.15.1 RF input/output
3.15.1.1 RF input and output
3.15.1.2 Spurious signals on the RF connectors
3.15.2 Analogue video connectors (where fitted)
3.15.2.1 Component analogue outputs for HD and SD using Y, Pb, Pr
3.15.2.2 PAL composite (CVBS)
3.15.3 Audio connectors — Analogue audio
3.15.4 Digital program interfaces
3.15.4.1 Audio datastream output
3.15.4.2 Digital video outputs, including HDMI
3.15.5 Data connectors (where fitted)
3.15.5.1 USB port
3.15.5.2 Local area network (LAN) connection
3.15.5.3 Ethernet connector
3.16 System software update
3.16.1 Software updates
3.16.2 Other methods of implementing system software update
Appendix A
A.1 Introduction
A.1.1 General
A.1.2 AS 4933.1:2000
A.1.3 AS 4933.1:2005
A.1.4 AS 4933.1:2010
A.1.5 AS 4933:2015
A.1.6 AS 4933:2024
A.1.7 AS 5362:2024
A.2 General
A.3 Signal bandwidths
A.4 COFDM parameters
A.5 Modes
A.6 Frequency ranges
A.7 Channel frequency offsets
A.8 Reception quality/tuning/scanning procedures
A.8.1 General
A.8.2 Common scanning procedures
A.8.3 Specifications for reception quality/tuning/scanning procedures
A.9 RF Input connector
A.10 Return loss (RL)
A.11 RF Output connector (option)
A.12 Receiver noise figure
A.13 Performance
A.13.1 Definitions
A.13.2 Failure point criteria
A.13.2.1 General
A.13.2.2 Approximate delta values between PFP1 and reference BER (QEF)
A.14 Carrier-to-noise threshold performance
A.15 Minimum receiver input levels
A.16 Receiver input sensitivity and overload
A.16.1 Antenna input sensitivity
A.16.2 Antenna input overload
A.17 Receiver selectivity
A.17.1 General
A.18 Impulse noise performance
A.19 Multipath performance
A.20 Guard interval utilization in an SFN
A.20.1 General
A.20.2 Gaussian C/N threshold performance in the presence of static 0 dB echo
A.20.2.1 COFDM parameters set A
A.20.2.2 COFDM parameters set B
A.20.3 Variable power echo
A.20.4 Symmetrical utilization of guard interval
A.21 Doppler echo performance
A.21.1 General and definition
A.21.2 Measurement
A.22 Immunity to DVB-T signals in other channels
A.22.1 General
A.22.2 Operation in the presence of other television emissions
A.23 Immunity to 700 MHz LTE signals in other channels
Appendix B
B.1 Introduction
B.2 Implementation of Single Frequency Networks (SFN)
B.2.1 SFN parameters
B.2.2 Types of SFN implementation (e.g. 1 + 0, 1 + 1, 1 + n)
B.3 SFN feed types
B.4 Transmission site selection — Siting/timing/propagation/terrain
B.5 SFN design and implementation
B.5.1 Planning DTTB coverage using SFN
B.5.2 Differences between coverage prediction and planning
B.5.3 Guard intervals (GI) and SFN planning
B.5.4 Wide area SFNs and SFN self-interference areas (often known as “mush zones”)
B.5.5 TPS within an SFN
B.5.6 SFN timing structure
B.5.7 Modulator interoperability and timing matching
B.5.8 Special considerations of on-channel repeaters
B.6 Assumptions on DVB-T receiver system design
B.6.1 DVB-T receivers (e.g. performance, noise figure, channel selectivity/sensitivity)
B.6.2 Receive antenna performance and orientation
B.7 Potential implementation issues
B.7.1 Global positioning system (GPS)
B.7.2 Other issues
B.8 DVB-T SFN coverage planning
B.8.1 Condition A: Small area SFN (where transmission site’s separation propagation delay is less than the guard interval)
B.8.2 Condition B: Wide area SFN (where transmission site separation propagation delay is greater than the guard interval GI)
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
G.1 Teletext standards for decoding and display
G.1.1 General
G.1.2 Display of captions
G.1.2.1 General
G.1.2.2 Notional grid for character location
G.1.2.3 Size of the notional grid
G.1.2.4 CC teletext row data
G.2 Reception of CCs from a DVB transport stream
G.3 Australian operational practice for Closed Captions
G.4 Identification of CCs in accordance with ETSI EN 300 472 Digital Video Broadcasting (DVB) — Specification for conveying ITU-R System B Teletext in DVB bitstreams
G.4.1 PES syntax
G.4.2 Variations to Program Presentation Time Stamps (PTS)
G.5 Display of live captions
Appendix H
H.1 Introduction
H.2 DVB Supplementary Audio Descriptor
H.2.1 General
H.2.2 Syntax and semantics for the Supplementary Audio Descriptor
H.2.3 PSI PMT signalling
H.2.4 EIT signalling
H.2.4.1 General principles
H.2.4.2 Visually impaired audio description
H.3 Audio Description SI/PSI Signalling
H.4 Audio Description SI/PSI Signalling for MPEG-4 HE AAC (ISO/IEC 14496-3)
H.5 Audio Description SI/PSI Signalling for MPEG-1 Layer II (ISO/IEC 11172-3)
Appendix I
I.1 Use of logical channel numbers (LCNs)
I.1.1 LCN syntax
I.1.2 Methods of displaying LCNs on a receiver’s OSD
I.1.3 Australian use of LCNs and variations from European usage
I.2 Overlap of translator and main transmitter programs
I.3 Dynamic response to changes in broadcasters’ transmissions
I.4 Setting time regions
I.4.1 General
I.4.2 Different time zones of Australian states
I.4.3 Broadcast TOT
I.5 Audio decoding — Part B
Appendix J
J.1 General
J.2 Australian requirements
J.2.1 General
J.2.2 Optionally displayed captions
J.2.3 Parental ratings issues
J.2.4 DRM
J.2.5 Program discovery and identification
J.3 Receiver IP connectivity
J.4 Presentation — Audio video capabilities
J.5 Links in the broadcast MPEG transport stream
J.5.1 Application information table (AIT) implementation
J.5.2 CRIDS
J.5.3 Program time shift — PVR functionality
J.6 Receiver conformance testing
Bibliography
Cited references in this standard
ITU-T H.264
(08/21), Advanced video coding for generic audio visual services
ITU-T H.262
(02/2012), Information technology – Generic coding of moving pictures and associated audio information: Video
ETSI EN 300-744
(2015-10), Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television
ETSI EN 300-743
(2018-10), Digital Video Broadcasting (DVB); Subtitling systems
ETSI EN 300-472
Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams
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