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Digital Broadcast Technologies

Article Description

Digital technology is becoming pervasive in all types of services. As computing power continues to increase, more and more functions can be tackled in the digital domain. An excellent example is the transmission of television pictures. This sample chapter from OpenCableā„¢ Architecture, winner of NCTA Book of the Year Award, introduces a number of key digital broadcast technologies.

Summary

This chapter introduced a number of important techniques and concepts:

  • Video and audio compression algorithms and how they are used to increase the channel capacity of a cable system

  • The MPEG-2 systems layer and the multiplexing of multiple program elementary streams into a single physical channel

  • Baseband transmission mechanisms for compressed audio and video streams, including ATM, SONET, IP, and DVB ASI

  • Broadband transmission mechanisms for compressed audio and video streams, including QPSK, QAM, and VSB modulation

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