The evolution of telecommunications towards an Integrated Services Digital Network (ISDN) offers new opportunities for signal processing, applications. Recent progress in basic techniques, like perfect signal decomposition and reconstruction or Least Squares adaptive filtering, are crucial in that evolution. Beyond the emergence of new equipment, signal processing advances are paving the way for artificial intelligence techniques, which will accompany the "information age" promised by the ISDN.
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M. Bellanger (1986) studied this question.
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