| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission method of a speech signal which is improved in a compression rate by conducting predictive coding. SOLUTION: An adder circuit 1a computes sum signals (L+R) of stereophonic two channel signals L and R and a subtracting circuit 1b computes difference signals (L-R). Difference computing circuits 11D1 and 11D2 compute differences Δ(L+R) and Δ(L-R) of this time and the previous time. Predictive coding circuits (15D1, 15D2, 16D1 and 16D2) compute a plurality of predictive values of the differences Δ(L+R) and Δ(L-R), compute each predictive residual of the plurality of predictive values and the differences Δ(L+R) and Δ(L-R) and selects a minimum predictive residual or the like, then, transmit the data through a prescribed communication line. COPYRIGHT: (C)2007,JPO&INPIT |
