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TRANSITION TO DIGITAL DIGITAL HANDBOOK Mobile video technology Expectations are set for mobile service. BY ALDO CUGNINI Last year, the Open Mobile Video Coalition (OMVC) released a specification, the ATSC Mobile DTV Receiver Profile Guidelines. The spec, issued by the OMVC Technical Advisory Group (OTAG), recommends two profiles for mobile receivers: a required Base Profile and an optional Enhanced Profile. (Let's call it an "E- Profile "). So consumers can sort it all out, it's conceivable that support for the Enhanced Profile could lead to a class of devices with a user -recognizable label. Although the OTAG spec concerns implementation of the ATSC A/153 standard, many of the embodied concepts apply to other systems throughout the world, such as DVB- MHP (Multimedia Home Platform). Video and audio, while customizable, will likely converge to common formats. H.264 (Base Profile Level 1.3 and Main Profile up to Level 3.1) is recommended by OTAG for both mobile profiles, at supported resolutions. Although Scalable Video Coding (SVC) is a broadcast option, OTAG has not entered it into a mobile profile, citing a lack of marketplace maturity for SVC -compatible consumer products. However, DVR -pause is required, and impulse recording and scheduled Broadcasters 1 1 1 DVR are "desirable" in the E- Profile. These step -ups will require additional storage memory. As an example, a combined data rate of 600kb /s for audio and video (reasonable for 416 x 240 resolution) would require 4.5MB for each minute of stored content - not too demanding given today's flash memory prices. The Scalable Full -channel Mobile Mode (SFCMM) is an optional transmission mode that scales mobile payload capacity up to the total available from the channel; such a device, of course, would not support legacy mobile broadcasts. SFCMM is deemed "desirable" in the E- Profile, as is a second tuner. HE -AACv2 (w/SBR) (High -efficiency Advanced Audio Coding with Spectral Band Replication) is required for all devices, as constrained in A /153 Part 8, with the average loudness of the audio at -14dB LKFS. Interaction (return) channel In both profiles, an interaction (or return) channel by one or more out -of -band sources (Internet, Wi -Fi, cellular, USB, Bluetooth) is required from all devices at least once per week. Interactivity, both active and passive, is a key differentiator that In -band delivery Out -of -band delivery Consumers Figure 1. As part of the requirement to provide their mobile viewers with connectivity, broadcasters can deliver electronic service guides in band through the OTA terrestrial channel, or over a separate interaction channel. 1 1 can set mobile apart from fixed- device broadcasting; users naturally want to interact with an audio /video device they hold in their hand, and this factor should pave the way for applications that leverage social and informational enhancements to linear TV viewing. Many of these interaction- channel media have persistence and connectivity challenges, which have led to various service -provider solutions. Under the DVB -MHP banner, interactivity and other enhancements have been defined using an Interactive - broadcast profile or an Internet -access profile, both being over and above the Enhanced -broadcast profile. Electronic service guides (ESG) can be delivered in -band (i.e., through the OTA terrestrial channel) and out -of -band, over a separate interaction channel, as shown in Figure 1. An in -band basic ESG is required in both OTAG profiles, while an enhanced ESG over an interaction channel is required in the E- Profile. Aggregation of multiple -ESG information collected from multiple providers is required by OTAG on all devices. File - based delivery is required on E- Profile devices to support the mobile aspects of the non - real -time (NRT) standard that allows in -band pre- caching and downloading of content. The rich media environment (RME) is required for supporting interactive components in the E- Profile. Defined by the Open Mobile Alliance (OMA), RME provides a rich graphical and media experience by integrating Scalable Vector Graphics (SVG), for graphical object creation, and ECMAScript, for script support, into a media stream. Conditional access and service/ audience measurement require an interaction channel. The A/153 Mobile DTV standard incorporates a conditional- access system (CAS) that 16 broadcastengineering.com I March 2013
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