In the MPEG-4 standard ISO/IEC 14496:2001 several audio objects that can be coded with different MPEG-4 format coding types can together form a composed audio system representing a single soundtrack from the several audio substreams. In a receiver the multiple audio objects are decoded separately, but...http://www.google.co.uk/patents/US8082050?utm_source=gb-gplus-sharePatent US8082050 - Method and apparatus for processing two or more initially decoded audio signals received or replayed from a bitstream
