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A Procedure for Designing Exact Reconstruction Filter Banks for Tree-Structured Subband Coders.
GEORGIA INST OF TECH ATLANTA SCHOOL OF ELECTRICAL ENGINEERING
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In recent years, tree-structured analysisreconstruction systems have been extensively studied for use in subband coders for speech. In such systems, it is important that the individual channel signals be decimated in such a way that the number of samples coded and transmitted does not exceed the number of samples in the original speech signal. Under this constraint, the systems presented in the past have sought to remove the overall analysisreconstruction distortion. In this paper, it is shown that it is possible to design tree-structured analysisreconstruction systems which meet the sampling rate condition and which also result in exact reconstruction of the input signal. This paper develops the conditions for exact reconstruction and presents a general method for designing the corresponding high quality analysis and reconstruction filters. Author
APPROVED FOR PUBLIC RELEASE