A METHOD FOR ALIAS REDUCTION IN CASCADED FILTER BANKS

Thispapershows anew way to reducealiasingin critically sampledcascadedfilter bank structures. Unlike standardtree structuredmethods,which lead to many aliasingcomponentsin the final subbands,our approachreducestheeffect by cancelingaliasingelementsamongsubbands.Our interestlies in compression applicationswherewe can apply the schemeto obtainanunequalor non-uniformbandsplitting using uniform cosinemodulatedfilter banks.In anexample it is shown that a reductionin aliasingof over 40 dB comparedto atraditionaltreestructuredfilter bankcan beachieved.

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