| 摘要 |
PROBLEM TO BE SOLVED: To provide efficient concept for outputting a signal which enables high quality operation, and efficient concept for reducing a signal in a low distortion state. SOLUTION: An apparatus 210 for providing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal includes: a multiband filter 204 for providing an intermediate real-valued subband signal; and a calculator 215 for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal. An index m is allocated to each signal of the real-valued subband signals according to a center frequency relating to the real-valued subband signal, and as the index m increases, the real-valued subband signal is arranged according to the center frequency relating to the signal. COPYRIGHT: (C)2011,JPO&INPIT
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