Adaptive digital filtering for signal reconstruction using spectrum extrapolation

This paper describes adaptive filtering for signal reconstruction. The speech quality enhancement system by the spectrum extrapolation of the band limited signals is discussed. In telephone communication, the spectrum extrapolation which employs aliasing processing is widely known. In this paper a new implementation using adaptive methods is proposed. This method introduces frequency domain adaptive digital filtering to broaden band limited signals into wide band signals. Implementation of the system and its performance are discussed.