SPEECH CODING METHOD, SPEECH DECODING METHOD, SPEECH CODING APPARATUS AND SPEECH DECODING APPARATUS

摘要

There is disclosed an encoding device capable of appropriately adjusting the dynamic range of spectrum inserted according to the technique for replacing a spectrum of a certain band with a spectrum of another band. The device includes a spectrum modification unit (112) which modifies a first spectrum S1(k) of the band 0 ‰¤ k < FL in various ways to change the dynamic range so that a way of modification for obtaining an appropriate dynamic range is checked. The information concerning the modification is encoded and given to a multiplexing unit (115). By using a second spectrum S2(k) having a valid signal band 0 ‰¤ k.