Design of multi-channel near-perfect-reconstruction transmultiplexers using cosine-modulated filter banks

The paper considers the design of nearly perfect reconstruction transmultiplexer systems based on cosine-modulated filter banks. Under the same scheme of cosine-modulation, several families of transmultiplexer systems are derived, the main difference of which is the prototype filter. We show several ways of obtaining this filter and we also propose a new technique for designing high-quality prototype filters. A comparative analysis is included to confirm the validity of the theory.

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