Scalable encoding device, and scalable encoding method

Abstract

Disclosed is a scalable encoding device capable of reducing an encoding rate thereby to reduce a circuit scale while preventing sound quality deterioration of a decoded signal. In this device, an extension layer is coarsely divided into a system for processing a first channel and a system for processing a second channel. A sound source prediction unit (112) for processing the first channel predicts the drive sound source signal of the first channel from the drive sound source signal of a monaural signal, and outputs the predicted drive sound source signal through a multiplier (113) to a CELP encoding unit (114). A sound source prediction unit (115) for processing the second channel predicts the drive sound source signal of the second channel from the drive sound source signal of the monaural signal and the output from the CELP encoding unit (114), and outputs the predicted drive sound source signal through a multiplier (116) to a CELP encoding unit (117). The CELP encoding units (114, 117) perform the CELP encoding operations of the individual channels by using the individual predicted drive sound source signals.

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