VOICE BAND SPREADING DEVICE AND VOICE BAND SPREADING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a voice band spreading device capable of generating a pseudo wideband voice having a higher quality from a voice signal degraded by the influence of a channel or the like.SOLUTION: The voice band spreading device comprises: a spectrum envelope extraction unit 103 for extracting a spectrum envelope of a first frequency band included in a frequency band of a voice signal from the voice signal; a first signal adding unit 106 for generating a first spread signal obtained by replacing a component of the first frequency band of the voice signal with a first interpolation signal generated on the basis of the voice signal and the spectrum envelope of the first frequency band; a spectrum envelope estimation unit 203 for estimating a spectrum envelope of a second frequency band that is not included in the frequency band of the voice signal on the basis of the first spread signal; and a second signal adding unit 206 for generating a spread voice signal from a second interpolation signal that is a signal in the second frequency band generated on the basis of the first spread signal and the spectrum envelope of the second frequency band and the first spread signal.SELECTED DRAWING: Figure 1