ENCODING DEVICE AND ENCODING METHOD

摘要

Provided is an encoding device which performs a fixed sound source codebook search with a small calculation amount even in a low-bit rate sound encoding without lowering the encoding efficiency. In the encoding device, a threshold value calculation unit (211) evaluates a correlation value of candidate positions sorted in each channel over a plurality of channels so as to identify the candidate position of each channel and adds the correlation values of the candidate positions of the respective channels so as to obtain a threshold value. A candidate position sorting unit (212) sorts the pulse candidate positions according to correlation between a combined sound of pulses arranged at a pulse position of each channel and a quantization target. A search control unit (221) performs control so that search is performed at the sorted pulse candidate position. If the sum of the correlation values already searched in the channel to be searched is below the threshold value, a control signal is outputted to a search termination unit (223). The search terminal unit (223) terminates the search at the pulse position candidate by the control signal inputted from the search control unit (221).