NOISE SIGNAL ENCODER AND VOICE SIGNAL ENCODER

摘要

A noise model change detecting unit (303) detects any change of a noise model parameter representing an input noise signal by using a noise model storage unit (302) where information concerning a noise model capable of expressing a statistical feature of the input noise signal calculated by a noise signal analyzing unit (301). A noise model updating unit (304) updates the noise model and outputs the updated model information. By using a noise signal encoder constituted of the units, the voiceless section (section including only noise) of the input signal or a noise signal separated from a voice signal is encoded. A voice section is encoded by a voice encoder.