Perception-based residual analysis-synthesis system

The paper describes a residual analysis-synthesis system which exploits the human perception mechanism on temporal varying signals using Zwicker´s (1990) three dimensional excitation-critical-bandrate time pattern as the framework. Temporal information is retrieved using a linear predictive analysis on the discrete cosine transformed signal and critical band intensity information is obtained by using non-uniform filter banks. The system is characterized by high frequency resolution and good time resolution. Novel phase prediction and phase correction techniques are employed to eliminate any boundary discontinuities between two time frames. Experimental results illustrate that high quality residual signals can be reproduced using a few parameters regardless of the temporal characteristics of the signal