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

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 deco...

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Hauptverfasser: KAWASHIMA, Takuya, OSHIKIRI, Masahiro
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creator KAWASHIMA, Takuya
OSHIKIRI, Masahiro
description 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)
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title SPEECH AUDIO ENCODING DEVICE, SPEECH AUDIO DECODING DEVICE, SPEECH AUDIO ENCODING METHOD, AND SPEECH AUDIO DECODING METHOD
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