By Jian Song, Zhixing Yang, Jun Wang
This ebook covers channel coding and modulation applied sciences in DTTB platforms from the final recommendations to the specific research and implementation. * Covers the chinese language DTTB commonplace which used to be introduced lately and hasn t been coated intimately * Introduces the SFN community utilizing the winning implementation of DTMB in Hong Kong for instance * Introduces the most recent introduced structures together with the ATSC M/H and DVB-NGH
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The equipment is mainly used for source processing, information processing, storage, and play as well as other functionalities. The source processing unit usually includes audio and video encoders, an adaptor, a data encapsulation device, a VOD (video on demand) system, and an editing processor. The MPEG encoder compresses and encodes the recorded audio and video signals into MPEG-2 format; the adaptor adaptively receives MPEG-2 signals from other networks such as synchronous digital hierarchy (SDH) and satellite and then sends them to the multiplexers for multiplexing purposes or to the program libraries for storage as well as further editing; the data encapsulation device helps packetize the Internet Protocol (IP) data and data in other formats used for data broadcasting as well as interactive services into signal format for DTV broadcasting and transmits these signals together with other signals to the users; the VOD system sends the programs and information requested by users; the editing processor edits and helps manage the stored digital programs.
The DVB-S is the transmission standard for satellite digital broadcasting in which one analog TV channel which previously delivered one PAL program can now support four DTV programs, and this greatly increases the efficiency of the satellite broadcasting system. The DVB-C is the transmission standard for DTV within the cable TV network in which one analog TV channel that previously delivered one PAL program can now provide four to six DTV programs. The DVB-T is the transmission standard for terrestrial digital broadcasting in which one analog TV channel that previously delivered one PAL program can now provide four to six DTV programs.
2 Gbps. Therefore, the DTV signal cannot be directly transmitted like the analog TV signal and compression (video encoding) is required to reduce the data rate. 2 Gbps down to ∼20 Mbps for HDTV signals and from 216 Mbps to ∼4 Mbps for SDTV signals. Video compression can be achieved mainly based on the following: Time Correlation between Consecutive Images. Usually, the adjacent images of the video signal are highly correlated, and this helps reduce the information to be transmitted. Space Correlation in Image.