Specifications for Slovenian DVB-T receivers |
|
This document represents minimum requirements for DVB-T receivers used in the Republic of Slovenia. The document is applicable for stand-alone set-top boxes (STB) , integrated receivers (iDTV)., SDTV level receivers and HDTV level receivers.
These specifications were published by the Post and Electronic Communications Agency of the Republic of Slovenia. The purpose of this document is to present general requirements for receiving, decoding and presentation of content distributed on the Slovene DVB-T platform.
1 Introduction 3.1 Dynamic channel management 4.2 Interfaces for Conditional Access 8.1 Requirements for Audio Decoder in SDTV Level RECEIVER 8.2 Additional Audio Decoder requirements for HDTV Level RECEIVER 11.2 Navigator (USER INTERFACE) 1 Introduction
1.1 TerminologySHALL (mandatory): Denotes that the item is mandatory. SHOULD (recommended): Denotes that the item is not mandatory, but highly recommended.
In this document universal term “RECEIVER” refers to all devices capable to receive DVB-T signal in order to present AUDIO and VIDEO content (iDTV, STB, other devices).
1.2 Purpose of the documentThe document represents minimum requirements for DVB-T receivers used in Republic of Slovenia. The document is applicable for stand-alone set-top boxes (STB) and also for integrated receivers (iDTV). The document is applicable for SDTV LEVEL RECEIVERS and HDTV LEVEL RECEIVERS and replaces previous version of REQUIREMENT SPECIFICATIONS FOR DVB-T RECEIVERS USED IN REPUBLIC OF SLOVENIA (issued 25.04.2008).
The document shall present technical support for producers and providers of receivers in order to allow them faster implementation of functionality required for DVB-T platform used in Republic of Slovenia. The specifications include following profile:
The purpose of this document is to present general requirements for receiving, decoding and presentation of content distributed in Slovene DVB-T platform. The HDTV Level receiver shall comply with all basic SDTV Level receiver requirements with some HDTV additions, i.e. HDTV Level receiver shall be backward compatible with SDTV and be able to receive and decode MPEG-2 and MPEG-4 SDTV based services as well as MPEG-4 AVC based SDTV and HDTV services. HDTV service is defined as a service that includes the MPEG-4 AVC High Definition video stream the surround audio stream and data streams for teletext and subtitling.
1.3 List of Abbreviations
2 Hardware requirements
2.1 RF part
2.1.1 GeneralThe receiver shall allow reception and demodulation of the DVB-T signal transmitted in accordance with EN 300 744 [1]. The receiver shall allow reception of the DVB-T signal in Single Frequency Networks (SFN) or Multi Frequency Networks (MFN). The receiver shall allow reception of all channels in UHF (Band IV-V with bandwidth 8 MHz) and reception of all channels in VHF (Band III with bandwidth 7 MHz). The receiver shall allow reception of the DVB-T signal with all combinations of following parameters:
The receiver shall allow reception of the DVB-T signal in environment with echoes according to EN 300 744 [1]. The receiver shall support at least -23dBm (≈86dBμV at 75Ohm) of input signal without degradation. Within the user interface the receiver shall provide the information of signal level and signal quality. The implementation of user interface is responsibility of the producer.
2.1.2 RF input connectorThe receiver shall have at least one tuner input connector in accordance with IEC 60169-2, part 2 [2] and shall allow the connection to external antenna with connector type: IEC 169-2 male. The input impedance shall be 75 Ohm. The receiver input signals should be bypassed independently from the status of receiver (operational or stand-by), so that connected equipment (e.g. TV set) can operate even if the receiver is in standby. 3 Tuning/Scanning proceduresThe receiver shall, in case of same Transport stream Id and Service Id on two or more different frequencies save all frequencies, or select the frequency with better signal. The receiver shall be able to receive and react on tuning parameters in PSI/SI tables (e.g. SDT or NIT information). In addition to the automatic search, the receiver shall allow a manual search where Channel Id (or frequency) is entered by the end user. The receiver shall tune to this channel, search all available DVB-T modes, add new services and replace existing services in the service list (without considering any quality criteria).
3.1 Dynamic channel managementThe receiver shall upgrade modulation parameters according to NIT table. The receiver shall upgrade »Services lists« according to SDT table.
3.2 Dynamic PMTThe receiver shall be able to handle dynamic changes in the Program Map Table (PMT). A practical use scenario for dynamic PMT changes is for example the requirement to support switching on and off regional variants of programs by a broadcaster. The receiver shall handle dynamic PMT changes in correct manner and also certain additional restrictions shall be observed:
It is recommended, that the video on the output should freeze (freeze frame), until the new video stream can be decoded and displayed.
4 Interfaces4.1 SCART interfaceThe receiver shall have at least one SCART Interface in accordance with EN 50049-1 [8] and EN 50157 2 1 [9]. The following table summarizes input/output signals available at all SCART interfaces:
Table 4 1: SCART requirements
* Not relevant for iDTV ** OPTIONAL (1): Control signal on PIN 8: Nom. 0 Volt/DC: internal source of TV set Nom. 6 Volt: external source, 16:9 format Nom. 12 Volt: external source, 4:3 format
(2): Control signal on PIN 16: Nom.0 Volt/DC: CVBS active 1-3 Volt/DC: RGB active
(3): The OSD graphics should not be present on the VCR SCART output except for DVB subtitling (if present and chosen)
The audio interface of the VCR SCART shall deliver the same audio signal as available at TV SCART Interface. The internal volume control should only affect the audio signal at TV SCART interface, but not the audio signal of the VCR SCART audio interface.
4.2 Interfaces for Conditional AccessThe receiver should support at least one DVB Common Interface (for CA module) for conditional access. CI-slot should comply with EN50221 [19].
4.3 Digital Audio OutputThe receiver shall have a coaxial or optical S/PDIF interface for digital audio to provide PCM signal according to IEC 60958 [20] or non-linear PCM coded audio stream according to IEC 61937 [21].
4.4 RCA analog video outputAs an OPTION HDTV Level STB should provide output of analogue YPbPr video according to CEA 770.3 [26]. The receiver should have at least one analogue audio interface based on two RCA connectors, female type IEC 60603-14 [32].
4.5 HDMI interfaceThe HDTV Level receiver with display (iDTV) shall support requirements specified for high definition video interfaces by EICTA for compliant HD Ready iDTV-sets [28]. The HDTV Level receiver without display (STB) shall have at least one High-Definition Multimedia Interface (HDMI) with type A connector[29], supporting displays that comply with the EICTA HD-Ready requirements [28]. The HDTV Level STB shall be able to use the EDID information provided by the display to automatically determine the STB output. The HDTV Level STB shall provide “Original Format” option, i.e. to output same format as received if supported by the display, as indicated by the EDID information. If received format is not supported, the STB shall select display mode providing the best possible video quality. This is required to avoid the STB output to go black, if there is a mismatch between received format and display capabilities. It shall also be possible to manually set default output format from the HDTV Level STB to a fixed format. Fixed format shall include at least one of the following formats:
The preferred default output shall be stored in the STB. The HDMI output shall provide stereo or stereo downmix or multichannel audio, and should be equipped with Auto lip-synch functionality. The HDMI output should be Auto lip-synch aware and should delay audio or video to compensate for latencies in downstream devices. iDTV HDMI input(s) should declare audio/video latency information in their EDIDs. 5 ProcessorThe receiver shall have a real time clock/calendar running continuously. The clock shall be updated by incoming TDT and TOT from SI. The receiver should have an internal timer for the possibility to automatically switch from standby mode to the operational mode. This timer shall be initiated locally (accepted by the end user).
6 MPEG DemultiplexerThe Demultiplexer shall be compliant to the MPEG-2 transport layer defined in ISO/IEC 13818-1 [5] and ETSI TS 101 154 [3] and:
7 MPEG VIDEO DecoderThe decoder of receiver shall fully comply with standard ISO IEC 14496-10 [4] for decoding MPEG-4 and ISO/IEC 13818-2 [17] for decoding of MPEG-2 coded signal. The decoder shall also comply with ETSI TS 101 154 [3] and shall support VBR and CBR. The decoder of receiver shall ensure synchronization between AUDIO and VIDEO as follows: audio shall never lead the video program by more than 20 ms, and shall never lag the video by more than 45 ms. The decoder of receiver shall have processing elements for video format conversion to output the decoded video on its HDMI and/or SCART or other analog interface. The display format signaling between the STB and the display device are either LINE23 WSS and/or voltage levels on a SCART PIN8 as defined by IEC 62216-1 [25] or in case of HDMI output comply with EICTA extensions to the IEC 62216-1 (6.4.3.7.4 AFD processing for HDMI output). Typically a smaller border region inside each edge of the 720x576 pixels area is not visible due to overscan on the SD display. For services carrying ISO/IEC 14496-10 video, the broadcaster may use the overscan_info_present and overscan_appropriate flags to indicate whether the receiver should apply this typical overscan or should display the complete broadcasted video image.
Table A – Broadcast overscan flags
Unless the user requests otherwise, integrated digital TV receivers shall interpret and follow the overscan flags according to Table B.
Table B – Receiver overscan behaviour
For receivers with HDMI output, the receiver shall pass the video without overscan related reformatting to its output, setting the bits in the AVI Infoframe [30].
Table C – Overscan signalling on HDMI
7.1 Decoding of SDTV servicesThe decoder of the receiver shall support profile “H.264/AVC Main Profile at Level 3” (used for H.264/AVC SDTV) and comply with ETSI TS 101 154 [3] (chapters 5.5 and 5.6; 25 Hz SDTV). The decoder of SDTV Level receiver shall decode also »MPEG-2 Main Profile@Main Level« and comply with ETSI TS 101 154 [3] (chapter 5.1; 25 Hz SDTV).The decoder of receiver shall decode pictures in resolution of 720x576 pixels with minimum data rate of 600 kbit/s. The decoder of receiver shall be able to switch between 4:3 and 16:9 picture aspect ratio. In case of receiving anamorphic picture and preset 4:3 on TV receiver the DVB-T receiver shall perform conversion to »16:9 letterbox«. Optionally the decoder should perform conversion to »14:9 letterbox«. The »16:9 letterbox« conversion shall be implemented by vertical filtering. Signal degradation due to the filtering should be subjectively imperceptible. Line 23 and line 623 should be masked before the letterbox conversion to avoid the irritating half lines. 7.2 Decoding of HDTV servicesThe HDTV Level receiver shall fully support decoding of SDTV services according to chapter 7.1 of this document. Video decoder shall support “H.264/AVC High Profile at Level 4” and comply with ETSI TS 101 154 [3] (chapter 5.7 H.264/AVC HDTV). In case of SCART, or if any other analogue video output (Y, Pb, Pr or other) is available, the decoded High Definition video shall be down-converted by SD format converter to standard definition (SD) resolution for output via these interfaces. Picture down-conversion shall be implemented from any of the incoming encoded HD full screen luminance resolution of 1920x1080 and 1280x720 (as an OPTION also from 1440x1080, 1280x1080, 960x1080, 960x720 and 640x720) to 720x576 standard definition (SD) resolution. Down-converted video shall be displayed as 16:9 letterbox on 4:3 displays. The SD format converter should apply appropriate re-interlacing. 8 Audio Decoder8.1 Requirements for Audio Decoder in SDTV Level RECEIVERThe receiver shall provide at least one stereo audio decoder that is able to meet minimum decoding requirements based on MPEG 1 Layer II ("Musicam" ISO/IEC 11172-3) and decoder for AC3. Audio decoder shall support also AAC* decoding according to ISO/IEC 14496-3 subpart 4 [34] (*mandatory for devices on Slovenian market from 01.01.2010). The Audio decoders shall fully comply with DVB Implementation Guidelines for the use of MPEG- 2 Systems, Video and Audio in satellite, cable and terrestrial Broadcasting Applications ETSI TS 101 154 [3].
8.2 Additional Audio Decoder requirements for HDTV Level RECEIVER
8.2.1 GeneralThe HDTV Level receiver shall support reception of multi-channel (up to 5.1) audio in addition to the mandatory audio requirements for SDTV Level receivers. The HDTV Level receiver shall provide analogue audio outputs for stereo/mono, S/PDIF output and an HDMI output for multi-channel audio. Optionally additional analogue outputs may be provided for additional surround sound or audio components for additional languages and/or impaired people. An audio output of HDTV level iDTV receiver shall be in sync with the displayed video. The HDTV level receiver shall be capable of decoding and down-mixing following formats for the analogue outputs:
The receiver shall always have the audio signal present on the analogue outputs (SCART and stereo out) whenever any of supported four formats is received. The multi-channel audio may be carried in two formats: HE-AAC [34] or E-AC3 [33]. For receivers on the Slovenian market after 01.01.2010 both formats shall be mandatory. HDTV services with multi-channel audio External interfacing equipment (like TV display unit) shall not be required to support more than 2 channel PCM audio within main Video/Audio interface (HDMI/SCART). The HD level receiver shall have an internal digital audio reference level equivalent to the Dolby dialogue normalization reference level of -31 dBFS. The HD level receiver shall adjust the output level of all audio decoders to match the internal reference level so that perceived programme loudness is consistent for all audio coding schemes. For receivers featuring E-AC3, this should be consistent with Dolby Technical Bulletin 11: Requirement Updates for AC3 and E-AC3 in DVB Products [34]. Receivers featuring AC3 or E-AC3 decoding shall include the PCM Level Control feature described therein. For example, for MPEG-1 Layer 2 audio streams that have an average loudness of about -20 dBLeq, the receiver shall apply an attenuation of 11 dB for the digital output to match the internal reference level.
8.2.2 Audio formatsThe HDTV Level receiver shall in addition to the audio requirements for SDTV Level receiver support the formats specified in chapters 8.2.2.1 and 8.2.2.2 of this document. 8.2.2.1 System with E-AC3 bitstreamThe HDTV Level receiver shall have capabilities for processing AC3 and E-AC3* streams. (*E-AC3 mandatory after 01.01.2010).
The receiver shall be capable of providing the following formats on the HDMI output connector:
The following formats are optional for the HDMI output connector:
The receiver shall be capable of providing the following formats on the S/PDIF connector:
Pass-through of DTS bitstream to the S/PDIF connector is optional.
The receiver shall:
Transcoding to AC3 audio streams shall be at a fixed bit rate of at least 640 kbit/s. The receiver shall support the use of Dolby metadata [33] embedded in the audio stream when decoding AC3 or E-AC3 bitstreams, transcoding E-AC3 bitstreams to AC3, or creating a PCM stereo downmix from a decoded E-AC3 or AC3 bitstream.
8.2.2.2 System with HE AAC bitstreamThe HDTV Level shall have capabilities for processing HE AAC* streams (*HE-AAC mandatory after 01.01.2010).
The receiver shall be capable of providing the following formats on the HDMI output connector:
The following formats are optional for the HDMI output connector:
The receiver shall be capable of providing the following formats on the S/PDIF connector:
Pass-through of DTS bitstream to the S/PDIF connector is optional.
The receiver shall:
If supported, transcoding to AC3 audio streams shall be according to ETSI TS 102 366 [33] at a fixed bit rate of 640 kbit/s. If supported, transcoding to DTS audio streams shall be according to TS 102 114 [24] at a fixed bit rate of 1,536 Mbit/s. The HDTV level receiver shall support the use of the following HE AAC metadata embedded in the audio stream when decoding HE AAC and transcoding HE AAC multichannel to AC3 or DTS:
9 Radio modeThe STB shall allow basic DVB-T RADIO reception and operation (switching between channels) without a TV screen. This can be done with a Radio/TV button on the front plate or on the remote control. In case of an alphanumeric display (optional) on STB the display should be large enough to accommodate the full length of the station name (up to 8 characters). If a DVB stream is labeled as a „Radio Service“, it should always be shown by the STB in the radio channel list, even if there might be an elementary video stream sent along.
10 System software upgradeThe receiver shall provide at least one mechanism for upgrading system software. HDTV Level receivers shall support and use OTA System Software Update procedure according to the ETSI TS 102 006 [12]. The manufacturer shall provide procedure and functions carrying out upgrade in the receiver. The receiver shall provide a mechanism to detect corrupt downloaded system software before it is used to replace current working software. If received system software is corrupt the receiver shall keep current (working) version of system software, thus making the receiver operational again. If so, the failure to download shall be indicated to the user with an error message that can be used in the contact with the customer relations office. It shall be possible for the user to abort the download (in areas of bad reception quality the download may take too long time) and the receiver shall be operational using the current version of system software. The receiver manufacturer shall provide the required MPEG-2 TS binary file (containing only applicable SSU service and all its (PSI/SI) signaling necessary for successful upgrade) intended for cyclic broadcast for each new version intended for system software download. For each new version of system software over-the air download, the manufacturer shall provide all necessary description documents to the network operator required for the transmission of the new software. The manufacturer is responsible for providing and distributing new releases of system software.
11 Middleware11.1 Service informationThe receiver shall have system software for interpretation and handling of the active service information and control of the local hardware/software according to EN 300 468 [10] and ETSI TR 101 211 [11]. The receiver shall be able to process the PSI/SI tables for both, the ‘Actual’ and the ‘Other’ transport stream. The following tables are a mandatory set of tables the receiver shall be able to process: NIT, CAT, PAT, PMT, SDT, EIT, TDT, TOT
The receiver shall offer basic functionality of EPG in order to present following:
11.2 Navigator (USER INTERFACE)The navigator shall be presented in SLOVENE language and shall support characters from code table ISO/IEC 8859-2 [23]. The user shall be able to set storable preferences for default audio language. If an audio stream for the default audio language is available for the service, the receiver shall automatically choose that audio-stream. The receiver shall provide a basic EPG for display of EIT Present/Following (short event descriptor, extended event descriptor, content descriptor). Also the EIT Scheduling table should be presented within the proprietary receiver navigator.
11.3 TeletextThe SDTV Level receiver shall offer at least one of following options for presentation of Teletext:
11.3.1 Teletext for HDTV Level RECEIVERHDTV Level receiver shall be able to display (EBU) Teletext (both normal teletext pages and teletext subtitling pages) using the OSD, meeting the requirements for level 1.5 in ETSI EN 300 706 “Enhanced Teletext Specification”. (Re-insertion of teletext data into VBI of the video signal for teletext pages not enough since the VBI signal is not defined for the HDMI. Therefore shall all HDTV Level receivers implement a full Teletext decoder level 1.5).
11.4 SubtitlingThe receiver shall be capable of decoding and displaying DVB subtitle services which are transmitted in conformance with ETSI EN 300 743 [27] including characters from code table ISO/IEC 8859-2 [23]. The HDTV Level receiver shall include default font(s) with good readability for all output video resolution modes for SDTV and HDTV. The HDTV Level receiver should be able to up-scale DVB SDTV subtitling and EBU Teletext subtitling for a service with HDTV video, with the target to keep the same relative size as the DVB SDTV subtitling and Teletext subtitling has within a SDTV video grid. Up-scaling should be done with a good readable result at the HDTV output. 11.5 User settingsThe user shall be able to store preferences in persistent memory. The receiver shall provide a function to reset all parameters to factory mode, thus removing all service lists, user preferences, etc. After reset, the receiver shall enter installation state.
12 Remote controlThe receiver shall have an easy to use remote control. The receiver manufacturer will determine the functionality of the remote control.
13 Factory presetsFor HDTV Level receivers following pre-settings shall be enabled:
|