In one embodiment, Encoder 110 and/or Decoder 120 are embodied as software stored on media and executed by a general purpose or specifically configured computer or data processing system, typically including a central processing unit, memory and one or more input/output devices and co-processors, as shown in FIGS. 1B and 1C. Alternately, the Encoder 110 and/or Decoder 120 may be implemented as log