Implementing ATSC Mobile DTV Jay Adrick – VP Broadcast Technology Harris Corporation Understanding the MDTV System ATSC Mobile DTV Overview 4 Consumers receive mobile TV signal on DTV stations transmit mobile TV signal with many different devices via ATSC Mobile DTV addition of ATSC Mobile DTV system chip and module ATSC DTV ILLUSTRATIVE EXAMPLE OF SPECTRUM SPLIT Mobile Broadcast phone System Remaining digital Portable transport is used media to deliver mobile player signals 19.4 MbpsMPH of signal Spectrum Laptop + computer (dongle) ATSC Mobile ATSC Mobile DTV System DTV chip GPS device A portion of digital transport is used for traditional TV signal Automobile- based TV What is ATSC Mobile DTV • Optimized Mobile / Pedestrian / Handheld (MPH) transmission and reception system • Embellishment to ATSC DTV standard • Mobile DTV service within broadcasters’ existing DTV channel assignment and transmission infrastructure • No outside service providers required but perhaps desired • 100% backwards compatible addition to ATSC main transmission • Transmitted spectrum identical to 8-VSB, so no additional FCC authorization ATSC Mobile DTV Features • Robust physical layer – High immunity to drop-outs and burst noise – No need for receiver antenna diversity – Up to 12.5 db system gain over regular ATSC channel – High-Speed reception – up to 300 km/h • Data efficient and completely scalable – 3.667 Mbps of ATSC TS could provide up to 980 Kbps mobile/handheld service – Scalable coding for selectable robustness of signal – Efficiency ranges from 37% to 17% depending on the level of coding • Power savings for handheld devices due to bursted transmission – Allows receiver RF circuitry to be ON part-time to save battery life ATSC Mobile DTV Features • IP based mobile payload – Supports stream and non real time file delivery – Enables cross media compatibility – Utilizes efficient AVC h.264 video coding and AAC-HE audio coding • Each RF channel is capable of delivering up to 8 individually coded mobile IP data streams (Ensemble) – Each IP data stream can support multiple services…Video+Audio, Audio only, Service Guide, NRT services, etc. – System maintains at least 4.7 Mbps legacy ATSC in TS • System supports service protection which enables – Viewer identification – Access control – Paid service offerings ATSC M/H Features • Electronic Service Guide system based on OMA – Bcast standard supports a variety of features – rapid channel changing – video on demand – banner advertising – Datacasting & podcasting – voting – E-commerce • Easy integration into ATSC broadcast systems – Encoder(s), signaling, ESG and Mobile adaptor at studio – No changes/additions to the STL – Replacement exciter at transmitter ATSC Mobile DTV Major Layers Presentation Layer Audio and Video Codecs Captioning Management Layer Transport Streaming and Non-Real Time File Transfer Electronic Service Guide Physical Layer RF Transmission and Forward Error Correction; Compatibility with Legacy 8-VSB Receivers/Decoders ATSC Mobile DTV Layer Stack Presentation Management Phy RME ESG AFD -708 CEA FLUTE HE-AAC AVC NTP SMT ETC. STKM RTCP LTKM. ALC RTP UDP IPv4 FIC DATA RS Frame Training TPC FIC M/H Payload FEC (SCCC) Sequences Advanced Television Systems CommitteeATSC 8-VSB 8-Level Vestigial Sideband Modulation ATSC Mobile DTV Layer Stack Acronyms Deciphered Presentation Management Rich Electronic Physical Media Service Environment Guide File Delivery CEA-708 Captions Description over Active Format Unidirectional Advanced Advanced Transport Audiio Coding Video Coding High-Efficiency Term Asynchronous Real-Time Protocol Layered Protocol Table, ETC. Table, Transport Network Time Short (Long) Service Map RTP Control Key Message Key Coding Protocol User Datagram Protocol Internet Protocol version 4 Fast Information Channel Reed-Solomon Frame DATA Transmission Fast Mobile/Handheld Payload Training Parameter Information Forward Error Correction Sequences Channel Channel (Serial Concatenated Convolutional Coding) Advanced Television Systems Committee 8-Level Vestigial Sideband Modulation ATSC Mobile DTV Station Architecture • ATSC A/153 standardizes the characteristics of the emitted Mobile DTV signal and describes the functionality that resides within the signal. – A/153 does not standardize the method of implementation – It does guarantee transmission to receiver interoperability • The following description of ATSC Mobile DTV station implementation reflects the product architecture developed by Harris and our team partners. • Other manufacturers may implement their products using another method. • Currently, there is limited interoperability between some manufacturers – Interface interoperability is under development in ATSC S5 – Harris equipment design reflects that activity Transmission System Pre-Processing Legacy 8VSB Processing ATSC Mobile DTV Transmission System SynchronyMNA Studio STL M2X Transmitter Legacy 8VSB Processing System Architecture - ATSC Only Studio Transmitter ATSC PSIP STL Generator MPEG-2 TS IP ATSC Main Existing Channel ATSC ATSC Encoder(s) & Transmitter Exciter Service Multiplexer System Architecture with Basic ATSC Mobile DTV Studio Transmitter ATSC PSIP STL Generator IP MPEG-2 TS ATSC Main MPEG-2 TS Synchronous M2X Channel Mobile Network Exciter ATSC Adaptor Encoder(s) & Mobile Multiplexer w/ M/H Transmitter System Time Generator Preprocessor Service Multiplexer Mobile Preprocessor SFN Processor IP Mobile IP Channel IP Switch Encoder(s) IP Signaling Generator Electronic Service Products Key Guide (optional) Transmission Products NRT Content Networking Products Station Manager/Server Partner Products Metadata (optional) Third Party Supplied System Architecture with Advanced ATSC Mobile DTV Studio Transmitter ATSC PSIP STL Generator IP MPEG-2 TS ATSC Main MPEG-2 TS Synchronous M2X Channel Mobile Network Exciter ATSC Adaptor Encoder(s) & Mobile Multiplexer w/ M/H Transmitter System Time Generator Preprocessor Service Multiplexer Mobile Preprocessor SFN Processor IP Mobile IP Channel IP Switch Encoder(s) IP Signaling Generator Electronic Service Products Key Guide (optional) Transmission Products NRT Content Networking Products Station Manager/Server Partner Products Metadata (optional) Third Party Supplied System Architecture with Advanced ATSC Mobile DTV Studio Transmitter ATSC PSIP STL Generator IP MPEG-2 TS ATSC Main MPEG-2 TS Synchronous M2X Channel Mobile Network Exciter ATSC Adaptor Encoder(s) & Mobile Multiplexer w/ M/H Transmitter System Time Generator Preprocessor Service Multiplexer Mobile Preprocessor SFN Processor IP Mobile IP Channel IP Switch Encoder(s) IP Signaling Generator Electronic Service Products Key Guide (optional) Transmission Products NRT Content Networking Products Station Manager/Server Partner Products Metadata (optional) Third Party Supplied System Architecture with Advanced ATSC M/H & SFN Studio Transmitter ATSC PSIP STL Generator IP MPEG-2 TS ATSC Main MPEG-2 TS Synchronous M2X Channel Mobile Network Exciter ATSC Adaptor Encoder(s) & Mobile Multiplexer w/ M/H Transmitter System Time Generator Preprocessor Service Multiplexer Mobile Preprocessor SFN Processor M2X IP Mobile IP Exciter ATSC Channel IP Switch w/ M/H Transmitter Encoder(s) IP Preprocessor Signaling Generator Electronic Service Products Key Guide (optional) Transmission Products NRT Content Networking Products Station Manager/Server Partner Products Metadata (optional) Third Party Supplied System Architecture with Full ATSC M/H & SFN Studio Transmitter ATSC PSIP STL Generator IP MPEG-2 TS ATSC Main MPEG-2 TS Synchronous M2X Channel Mobile Network Exciter ATSC Adaptor Encoder(s) & Mobile Multiplexer w/ M/H Transmitter System Time Generator Preprocessor Service Multiplexer Mobile Preprocessor SFN Processor M2X Service IP IP IP Mobile Protection Exciter ATSC Channel IP Switch Encryptor w/ M/H Transmitter Encoder(s) Preprocessor (optional) IP Signaling Generator Encryption Server Data Electronic Service Products Key Guide (optional) Transmission Products NRT Content Networking Products Station Manager/Server Partner Products Metadata (optional) Third Party Supplied ATSC Mobile DTV Encoder • Function: Compresses and encodes audio/video program content into low bit rate IP packetized data streams for transmission to ATSC Mobile enabled receiving devices • Requirement: One encoder for each real time program stream that is to be transmitted over the ATSC Mobile DTV system. Redundancy should be considered at N:1 level • Detailed Specifications: – Video • Encoding format – MPEG4 h.264 base profile v1.3 • Resolution – 416 x 240 Progressive scanning • Aspect ratio – 16 x 9 (Wide Screen) • Source video – Could be 1080I, 720P, 480P (ws) or 480I (ws) – Recommended to start with 16 x 9 format or convert prior to encoding – Encoder should respond to AFD (Automatic Format Descriptor) • Closed captioning – CEA 708 format ATSC Mobile DTV Encoder • Detailed Specifications cont’d: – Audio • Encoding format – HE AAC v2.0 (High Efficiency Advanced Audio Codec version 2.0) • Sampling Frequency – 16, 22.05, 24 KHz. with SBR & 32, 44.1, 48 KHz. w/o SBR SBR = Spectral Band Replication • Audio format – Mono or Stereo (System is capable of supporting parametric surround) • Source audio – AES digital – Discrete or imbedded – Output • Packetized IP over UDP (User Datagram Protocol) with RTP (Real- time Transport Protocol) • RTP supports: – Payload-type identification - Indication of what kind of content is being carried – Sequence numbering - PDU sequence number – Time stamping - allow synchronization