STEREO ENCODING DEVICE, STEREO DECODING DEVICE, AND THEIR METHOD

摘要

Disclosed is a stereo encoding device which can improve critical channel encoding accuracy without increasing the encoding information amount. The device includes: a monaural signal synthesis unit (101) which combines a left channel signal L(n) and a right channel signal R(n) so as to generate a monaural signal M(n); a correlation coefficient calculation unit (102) which calculates a correlation coefficient C_ML between M(n) and L(n) and a correlation coefficient C_MR between M(n) and R(n); a critical channel judging unit (103) which decides one of the L(n) and R(n) having a smaller correlation with M(n) as the critical channel if the ratio of CML against CMR is not within a predetermined range from 90% to 111%, for example; and an ICP encoding unit (104) which performs ICP encoding by adjusting the degree of the ICP parameter of the critical channel to be higher than the degree of the ICP parameter of the non-critical channel.