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Direct Broadcast Satellite Communications: An MPEG Enabled Service by Donald C. Mead

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Appendix E. Cyclical Redundancy Code

In most packetized communication systems, it can be valuable to know if a transmission error has occurred. If a return link is available, a Negative Acknowledge (NAK) can be sent back to the transmitter so the packet can be resent. In broadcast audio/visual services, it is usually possible to conceal errors if it is known that an error has occurred. Thus, both the Systems and Audio parts of MPEG incorporate a Cyclical Redundancy Code (CRC) to detect errors in the bitstream.

In Chapter 5, simple Elias codes were introduced. It was shown that by breaking a message into 4-bit nibbles and calculating row- and column-parity checks that were appended to the message, all single bit errors in the message could be ...

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