QUANTIZING DEVICE, ENCODING DEVICE, QUANTIZING METHOD, AND ENCODING METHOD

摘要

A quantizing device for more efficient quantization realized by lessening the computational complexity of quantization of a balance weighting factor. The device includes a power/correlation calculating unit (201), an intermediate value calculating unit (202), a codebook (203), a searching unit (204), and a decoding unit (205). The power/correlation calculating unit (201) determines the value of the correlation between an L signal and an M signal and the value of the correlation between an R signal and the M signal and calculates the power of the M signal. The intermediate value calculating unit (202) determines two intermediate values by using the power of the M signal and the values of the correlations. The codebook (203) holds scalar values. The searching unit (204) selects a coefficient for balance adjustment of the amplitude of the M signal with respect to the L signal from among the scalar values according to the two intermediate values. The decoding unit (205) determines the coefficient for balance adjustment of the M signal with respect to the R signal by using the selected coefficient for balance adjustment of the M signal with respect to the L signal on the basis of the quantitative relation between the amplitudes of the signals of when the M signal is generated by down-mixing the L and R signals.