The optimization of PWM methods is essential for the evolution of integrated digital audio systems. The proposed system employs multirate analysis of the original audio wave form with parallel evaluation of its noise-masking threshold. The signal is then requantized and PWM coded so that quantization and modulation noise is kept below this threshold. An additional oversampling and noise-shaping procedure is included to minimize modulation artifacts.

Authors: Karachalios, George; Mourjopoulos, John
Affiliation: Wire Communications Laboratory, Electrical Engineering Department, University of Patras, Patras, Greece
AES Convention: 96 (February 1994) Paper Number: 3818
Publication Date: February 1, 1994
Subject: Digital Signal Processing

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