Question: Consider the following two Forward Error Correction (FEC) schemes for Internet phone. The first scheme sends a redundant encoded chuck after every 4 chunks. The

  1. Consider the following two Forward Error Correction (FEC) schemes for Internet phone. The first scheme sends a redundant encoded chuck after every 4 chunks. The redundant chuck is obtained by exclusive-OR-ing the 4 original chucks. The second scheme is based on the Piggybacking Lower Quality Stream, uses a low-bit rate encoding whose transmission rate is 25 % of the transmission rate of the nominal stream.
    1. How much additional bandwidth does each scheme require? How much playback delay does each scheme add? Note, for Internet phone, chucks are generated every 20 msec, each chuck is 160 bytes.
    2. How do the two schemes perform if the first packet is lost in very group of five packets? Which scheme will have better audio quality?
    3. How do the two schemes perform if the first packet is lost in every group of two packets? Which scheme will have better audio quality?

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