4th International Conference on Spoken Language Processing

Philadelphia, PA, USA
October 3-6, 1996

Restoration of Wide Band Signal from Telephone Speech using Linear Prediction Error Processing

Hiroshi Yasukawa

NTT Optical Network Systems Laboratories, Nippon Telegraph and Telephone Corporation, Yokosuka-shi, Kanagawa, Japan

This paper describes a system that can enhance the quality of speech signals that are severely band limited during regular telephone speech transmission. We have already proposed a spectrum widening method that utilizes aliasing in sampling rate conversion and digital filtering for spectrum shaping. This paper proposes a new method using linear prediction (LP) residual error processing and parameter (coefficients) mapping using linear extrapolation that offers improved performance in terms of the spectrum distortion characteristics. Real time hardware implementation procedures are discussed. The proposed method can effectively enhance speech quality.

Full Paper

Bibliographic reference.  Yasukawa, Hiroshi (1996): "Restoration of wide band signal from telephone speech using linear prediction error processing", In ICSLP-1996, 901-904.