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AS 4933.1-2010
Digital television - Requirements for receivers - VHF/UHF DVB-T television broadcasts


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General Product Information

Document Type Standard
Status Current
Publisher:    Standards Australia
Committee CT-002
Supersedes:
AS 4933.1-2005
DR 09019 CP



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Abstract

Provides television receiver manufacturers with the technical specifications and requirements relating to digital television receivers intended to be used in Australia to receive and decode free-to-air DTTB transmissions that comply with the Australian DTTB transmission Standard AS 4599.1-2007.

Scope

This Standard specifies the requirements for equipment such as set-top-boxes, integrated receiver-displays and PVRs intended to be used in Australia for the reception of free-to-air (FTA) terrestrial DVB-T broadcast television and access to the program services offered.
In addition, it sets out a number of optional features that manufacturers may provide in such equipment, indicating which features are recommended and which features, if provided, must meet certain requirements in order to operate satisfactorily in the Australian environment.
This Standard is based on the ETSI/DVB-T suite of Standards, and defines requirements for both Standard Definition (SD) and High Definition (HD) receivers.
The requirements for digital television receivers set out in this Standard are consistent with the relevant Australian broadcast regulatory requirements. The international DVB Standards and related ETSI, IEC/ISO and ITU-R documents provide for various implementation systems. This Standard specifies the choices available in Australia and references Australian adaptations of these international Standards where appropriate.
Section 2 sets out the minimum requirements for receivers if they are to operate satisfactorily in the Australian environment to receive Australian FTA terrestrial DVB-T broadcasts.
Section 3 provides a comprehensive list of receiver specifications and features, indicating whether they are essential or optional, and if optional, whether they are recommended or subject to certain requirements, or both. The optional features referred to in this Standard include interactive middleware and audio decoding choices such as surround and multilingual sound, as well as interfaces for ancillary equipment.
This Standard does not specify the final presentation characteristics of picture (display) and sound or associated services.
This Standard does not cover the requirements for subscription television receivers. Specifications for subscription/pay services should be obtained from the operators of those services.
Attention is drawn to the following appendices:
(a) Appendix B (normative), which details requirements and measurement methods for the RF performance of the receiver’s tuner.
(b) Appendix I (informative), which provides guidance on issues related to the functional design of receivers that have attracted attention since the start of DVB-T transmissions.
(c) Appendix J (informative), which provides a list of abbreviations and a glossary of terms used in this Standard.

Application

Australian digital terrestrial transmissions include SDTV video (in a format generally referred to as 576i) and HDTV video (in formats generally referred to as 720p and 1080i). The audio format used for SD services is MPEG-1 Layer II, or both MPEG-1 Layer II and AC-3. For HD the audio format is MPEG-1 Layer II or AC-3, or both. The primary purpose of this Standard is to identify the minimum essential requirements for equipment intended to receive, demodulate and decode television broadcasts that comply with the Australian implementation of DVB-T. However, because there is a range of optional features that receiver manufacturers may provide, additional information and recommendations are provided to clarify the preferred or required (as applicable) operation or facility in such cases.
As indicated in the minimum requirements, equipment must be capable of simultaneously decoding from the Transport Stream a video stream, an associated audio stream and associated Teletext Closed Captions. The decoded information shall be presented in a time-synchronized manner suitable for a display device and sound reproduction system.
If necessary, the video may be required to be spatially format-converted (‘scaled’), as the received format may be different from the display format. For example, if an HD-capable, digital, terrestrial set-top-box receiver is connected to a legacy 4:3 television display, downscaling will be required to display a received HD 16:9 program. Correspondingly, the received audio channels may need to be processed or downmixed to suit the available sound reproduction equipment.

History

First published as AS 4933.1-2000.
Second edition 2005.
Third edition 2010.

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