| 摘要 |
<p>A decoding apparatus that uses a less number of hierarchical layers and a less amount of calculation to obtain a decoded signal having a high quality in terms of audibility. In the decoding apparatus, a first layer decoding part (152) decodes a first layer encoded data. A second layer decoding part (153) decodes a second layer encoded data. An adding part (154) adds together a composite signal outputted from the first layer decoding part (152) and a composite signal outputted from the second layer decoding part (153). A band expanding part (155) uses a band expansion encode data to perform a band expansion of the high frequency components of the composite signal outputted from the first layer decoding part (152). A filter (156) filters the composite signal obtained by the band expanding part (155), thereby extracting the high frequency components. An adding part (157) adds the high frequency components outputted from the filter (156) to the composite signal outputted from the adding part (154), thereby obtaining an ultimate decoded signal.</p> |
