TAILIEUCHUNG - 56 Digital Television

Digital television is being widely adopted for various applications ranging from high-end applications, such as studio recording, to consumer applications, such as digital cable TV and digital DBS (Direct Broadcasting Satellite) TV. For example, several digital video tape recording standards, using component format (D1 and D5), | Tzou K. Digital Television Digital Signal Processing Handbook Ed. Vijay K. Madisetti and Douglas B. Williams Boca Raton CRC Press LLC 1999 1999 by CRC Press LLC 56 Digital Television Kou-Hu Tzou Hyundai Network Systems Introduction EDTV HDTV Standards MUSE System HD-MAC System HDTV in North America EDTV Hybrid Analog Digital Systems Error Protection and Concealment FEC Error Detection and Confinement Error Concealment Scalable Coding for Error Concealment Terrestrial Broadcasting Multipath Interference Multi-Resolution Transmission Satellite Transmission ATM Transmission of Video ATM Adaptation Layer for Digital Video Cell Loss Protection References Introduction Digital television is being widely adopted for various applications ranging from high-end applications such as studio recording to consumer applications such as digital cable TV and digital DBS Direct Broadcasting Satellite TV. For example several digital video tape recording standards using component format D1 andD5 composite format D2 andD3 orcompressed component formats Digital Betacam are commonly used by broadcasters and TV studios 1 . These standards preserve the best possible picture quality at the expense of high data rates ranging from approximately 150 to 300 Mbps. When captured in a digital format the picture quality can be free from degradation during multiple generations of recording and playback which is extremely attractive to studio editing. However transmission of these high data-rate signals may be hindered due to lack of transmission media with an adequate bandwidth. Although it is possible the associated transmission cost will be very high. The bit rate requirement for high definition television HDTV is even more demanding which may exceed 1 Gbps in an uncompressed form. Therefore data compression is essential for economical transmission of digital TV HDTV. Before motion-compensated DCT coding technology became mature in recentyears transmission of

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