| 摘要 |
Provided is a stereo audio encoding device which can improve ICP accuracy of a stereo audio signal having a low inter-channel correlation while suppressing a bit rate. The device (100) includes: a monaural signal generation unit (101) which generates an average value of a left channel signal L and a right channel signal R as a monaural signal M; an adaptive synthesis unit (103) which generates a synthesis signal L2 of the left channel signal L and the right channel signal R by using a synthesis ratio a inputted from a synthesis ratio adjusting unit (105); LPC analysis units (102, 104) which perform LPC analysis on the monaural signal M and the synthesis signal L2 so as to generate linear prediction residual signals Me, L2e, respectively; a synthesis ratio adjusting unit (105) which firstly initializes the synthesis ratio a to 1.0 and then reduces the synthesis ratio a until the correlation value between the linear prediction residual signal L2e and Me reaches a predetermined value; and an ICP analysis unit (106) which performs ICP analysis by using Me and L2e.
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