| 摘要 |
PURPOSE:To improve follow-up response to variation in companding rate by calculating the latest movement quantity of a pointer based on an elapsed time quantity from a last start point and a recent companding rate at each unit time and performing a thinning-out or inserting process every time the movement quantity reaches the start point while becoming equal to the elapsed time quantity. CONSTITUTION:A pointer movement quantity calculation part 5 calculates the latest movement quantity of the pointer based on the latest companding rate at intervals of unit time, so variation in the companding rate is always monitored and detected at a period of the unit time. Then when the latest movement quantity reaches the elapsed time quantity from the last start point which is calculated by an output quantity calculation part 6, a waveform generation part 3 performs the thinning-out or inserting process. Consequently, a voice signal is compressed or expanded following speedily up the variation in the companding rate. |
