| 摘要 |
A FILTER APPARATUS (101, 102, 103) FOR FILTERING A TIME DOMAIN INPUT SIGNAL TO OBTAIN A TIME DOMAIN OUTPUT SIGNAL, WHICH IS A REPRESENTATION OF THE TIME DOMAIN INPUT SIGNAL FILTERED USING A FILTER CHARACTERISTIC HAVING AN NON-UNIFORM AMPLITUDE/FREQUENCY CHARACTERISTIC, COMPRISES A COMPLEX ANALYSIS FILTER BANK (101) FOR GENERATING A PLURALITY OF COMPLEX SUBBAND SIGNALS FROM THE TIME DOMAIN INPUT SIGNALS, A PLURALITY OF INTERMEDIATE FILTERS (102), WHEREIN AT LEAST ONE OF THE INTERMEDIATE FILTERS (102) OF THE PLURALITY OF THE INTERMEDIATE FILTERS (102) HAS A NON-UNIFORM AMPLITUDE/FREQUENCY CHARACTERISTIC, WHEREIN THE PLURALITY OF INTERMEDIATE FILTERS HAVE A SHORTER IMPULSE RESPONSE COMPARED TO AN IMPULSE RESPONSE OF A FILTER HAVING THE FILTER CHARACTERISTIC, AND WHEREIN THE NON-UNIFORM AMPLITUDE/FREQUENCY CHARACTERISTICS OF THE PLURALITY OF INTERMEDIATE FILTERS TOGETHER REPRESENT THE NON-UNIFORM FILTER CHARACTERISTIC, AND A COMPLEX SYNTHESIS FILTER BANK (103) FOR SYNTHESIZING THE OUTPUT OF THE INTERMEDIATE FILTERS TO OBTAIN THE TIME DOMAIN OUTPUT SIGNAL.
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