Professor in Communication System and Signal Processing Dept. of Electrical Engineering, Universitas Andalas
Various MPEG audio standards, such as MPEG Surround, MPEG Advanced Audio Coding (AAC), MPEG Spatial Audio Object Coding (SAOC) as well as MPEG-H 3D Audio, employ a similar powerful hybrid filter-bank. Even though the filter-bank introduces an unbalanced delay, the overall filter distortion is very low. However, when MPEG Surround encodes multi-channel audio, such as 22.2 channels, the whole filter-bank structure can form a multi-layer filtering. In this paper, we investigate a case of balancing the delay for minimizing the overall filter distortion. The results of the experiments using 22.2 multi-channel audio signals show that the proposed balanced-delay filter-bank is capable of increasing the Signal-to-Noise Ratio up to 8 dB.
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