An encoder apparatus is disclosed for encoding a wideband digital information signal. The apparatus comprises an input signal (1) for receiving the wideband digital information signal, a signal splitting unit (2) for splitting the wideband digital information signal into M narrow band sub signals (SB.sub.1...http://www.google.ca/patents/US5661755?utm_source=gb-gplus-sharePatent US5661755 - Encoding and decoding of a wideband digital information signal
