By Amitabh Kumar
Enforce cutting-edge cellular television networks with this accomplished advisor to the most recent applied sciences and criteria, together with MediaFLO, ATSC cellular DTV, and CMMB, an analogous applied sciences seeing large-scale rollouts this present day world wide. You not just achieve deep perception into the maze of applied sciences, but in addition the rules of cellular content-what makes it paintings, how it is produced, repurposed and brought securely, and the way it integrates with cellular and web domains. find out about the main enablers of a cellular television provider, like smartphones, chipsets, and cellular software program. achieve entry to a close examine the networks deployed all over the world with real-world case reports. The informative diagrams supply wealthy visualization of the recent applied sciences, companies, and profit versions. achieve figuring out of the way cellular television may be made interactive and the way it may be brought seamlessly in a number of markets. Get perception into the turning out to be services of multimedia handsets and software program which drives leading edge purposes. writer Amitabh Kumar starts with the fundamentals of cellular multimedia and progresses to hide information of applied sciences, networks, and firmware for cellular television prone. effortless to keep on with, enforcing cellular television incorporates a wealthy presentation that comes with dozens of FAQs and "Quick Facts." This re-creation is up to date to mirror the speedy evolving international of cellular television, concentrating on elements for achievement and supplying realizing of: * 3G, Terrestrial broadcast, and cellular WiMAX networks * MediaFLO, ATSC cellular DTV, and CMMB Broadcasting * permitting applied sciences and protocols, spectrum, and possibilities for deployment * content material safeguard, conditional entry and DRM for the cellular international, in response to OMA-BCAST Smartcard and DRM profiles * Handset positive aspects for cellular television and multimedia providers * perception into making content material interactive-traffic, climate, interactive polling, certain ads * Roaming and interoperability in multimedia networks
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Extra info for Implementing Mobile TV, Second Edition: ATSC Mobile DTV, MediaFLO, DVB-H SH, DMB,WiMAX, 3G Systems, and Rich Media Applications (Focal Press Media Technology Professional Series)
8: Bit Rates for Small Screen Devices. 16: Compressing video. , scaling and compression—for reduction of bit rates. 64 megapixels per second. 3 K pixels per frame) and 15 frames per second, the required transmission rate is only 380 K pixels per second. 38 megapixels, which is a scaling down of approximately 23 times. The ﬁnal bit rate is of course determined by how many bits are required to carry each pixel. This is the domain of compression. The pixels are now ready to be subject to compression, the ﬁrst stage of which would begin by formation of 8ϫ8 macro blocks and application of DCT process, Huffman Coding, RLE, object-based coding, and so on, based on the compression protocol employed.
2 MPEG-2 The MPEG-2 standard (ISO 13818) is a compression standard that was ﬁnalized in 1994 and is today the most widely used standard for broadcast TV as well as storage applications such as DVDs. MPEG-2 was designed to handle full-resolution video, including HDTV. 5 to 15 Mbps for standard-deﬁnition video. The type of compression employed is deﬁned through the use of the MPEG-2 proﬁles. 5 Mbps may be adequate. For studio processing, the use of B- and P-frames is dispensed with and only I-frames are used, resulting in a compressed video stream at 50 Mbps.
As the broadcast networks begin to target the mobile devices, an understanding of the multimedia formats with origins in different domains becomes very important. Mobile networks are characterized by transmissions at speeds much lower than the standarddeﬁnition TVs and require audio and video to be compressed by very efﬁcient algorithms such as MPEG-4 with limited proﬁles. The mobile devices present a very constrained environment for applications, owing to the limitations of power, processor, and memory capacity.