Restoration of wide band signal from telephone speech using linearprediction residual error filtering

摘要

This paper describes a system that can enhance the quality ofspeech signals that are severely band limited during regular telephonespeech transmission. We have already proposed a spectrum widening methodthat utilizes aliasing in sampling rate conversion and digital filteringfor spectrum shaping. This paper proposes a new method using linearprediction (LP) residual error processing and LP parameter(coefficients) mapping that offers improved performance in terms of thespectrum distortion characteristics. Real time hardware implementationprocedures are discussed. The proposed method can effectively enhancespeech quality