Park Kyu Sik, Park Jae Hyun

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 3, No. 4, pp. 938-946, Jul. 1996
10.3745/KIPSTE.1996.3.4.938,   PDF Download:

Abstract

Hhierarchical subband codec has been widely promoted in the field of data commpression/decompression because of their simplicity and modular nature. Over the past years, the study has received great attention to the perfect reconstruction(PR) system which perfectly recovers the original input signal at the reconstructed output. However, in the actual subband codec system, the signals that passed through the analysis filter bank are quantized before transmission to the receiver side and reconstructed by the synthesis filter bank. Thus the PR system is impossible and the quantization effects must be carefully considered in the systema design such that the system recovers the reconstructed output as close ac possilble to the original input signal with minimum quantization error.In this paper, we propose an optimum hierarchical subband codec structure in the presence of quantizer. The optimality criteria of the codec is given to the design of the hierarchical analysis/synthesis subband filter bank and the quantizer that miniize the output mean square error due to the quantizer in the codec. Specific optimum sign examples are shown with level1-level2 hierarchical ortbnormal structure. The optimal designs are verified by computer simulation.

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