SPEECH AUDIO ENCODING DEVICE, SPEECH AUDIO DECODING DEVICE, SPEECH AUDIO ENCODING METHOD, AND SPEECH AUDIO DECODING METHOD

A speech/audio decoding apparatus is provided that includes a receiver (241) that receives encoded data including a limited-band mode flag, and a memory (244) that stores information on a position of a maximum amplitude spectrum: frequency of a previous frame in a divided band. The speech/audio decoding apparatus also includes a processor (245, 243) that identifies (245) whether a decoding band is encoded using a limited-band mode based on the decoded limited-band mode flag. Additionally, the processor decodes (243) the spectrum in a limited band within each of the divided bands in a current frame using the stored information. Furthermore, the limited-band mode is set at an encoder side, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a spectrum of the divided band in the current frame is below a threshold. (Figure 1)