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This paper focuses on a newly developed transparent nADPCMBJ&#x22A5;MLT speech coding algorithm. Our coder first decomposes the narrowband speech signal in subbands, a non linear ADPCM scheme is then performed in each subband. The signal subband decomposition is piloted by the equivalent Modulated Lapped Transform (MLT) filter bank. The novelty of this algorithm is the non linear approach, based on neural networks, to subband prediction coding. We have evaluated the performance of the nADPCMB&#x22A5;MLT coding algorithm with a session of formal listening based on the five grade impairment scale standardized within ITU - T Recommendation P.800.

A new subband non linear prediction coding algorithm for narrowband speech signal: The nADPCMB⊥MLT coding scheme