CODING APPARATUS, DECODING APPARATUS AND SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a decoding apparatus which eliminates the unreasonable need for having audience to always view at a high quality level. SOLUTION: The decoding apparatus 30a comprises: a narrow-band decoder 31 for regenerating a PCM signal P1based on a narrow-band bit stream contained in a broadband bit stream S0; a broadband decoder 32 for regenerating a PCM signal P2having a band broader than the PCM signal P1regenerated by the narrow-band decoder 31 based on the narrow-band bit stream contained in the broadband bit stream S0and a band-expanded bit stream; and a selector 34 for selecting and outputting either the PCM signal P1or P2regenerated by the narrow-band or broadband decoders 31, 32, respectively. COPYRIGHT: (C)2003,JPO