| 摘要 |
PROBLEM TO BE SOLVED: To improve compression ratio in the case of predicting-coding of multi-channel voice signals. SOLUTION: An adding circuit 1a calculates a sum signal (L+R) of two- channel stereo signals L, R, and a subtracting circuit 1b calculates a difference signal (L-R). Difference arithmetic circuits 11D1, 11D2 calculate difference Δ(L+R), Δ(L-R) between this time and least time, and predicting-coding circuits (15D1, 15D2, 16D1, 16D2) calculate plural predicted values of the differences Δ(L+R), Δ(L-R), and calculate each prediction residual of the plural predicted values and the differences Δ(L+R), Δ(L-R), and a minimum prediction residual is selected. |
