[Mp4-tech] [Audio] Erroneous bit streams...

[guhapriya ganapathy]

Dear all,
  Suppose you have an audio codec which is a part of a broadcast system (any system for that matter). What are the possible errors that might creep in the bitstream when it reaches the decoder? (There will be CRC check for each packet in the network layer, but I am concerned about the bitstream when it reaches the decoder.. what are the chances that the bit stream is corrupted?) 
  Taking AAC HE as an example, Coding Technologies provides erroneous bitstreams for SBR (although SBR has CRC check) as a part of its certification package (wherein for example one bit in every third frame is corrupted – a random corruption!), whereas ISO does not(?) provide erroneous bitstreams. Of what value are erroneous bitstreams to the decoder? Is there a value add in generating erroneous bitstreams for decoders? If so, what is the approach so that it matches what happens in the real time?
  Regards,
  Guha Priya.
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