| 摘要 |
PURPOSE:To facilitate signal processing arithmetic by dividing the amplitude increase processing period of an amplitude control means into two about 3/4 of a reference final value as a border and setting the amplitude increase ratio of the front and rear processing periods to 4:1. CONSTITUTION:The amplitude increase processing period of the amplitude control means is divided into two about 3/4 of the reference final value as the border and the amplitude increase ratio of the front and rear processing periods is set to 4:1. Namely, a fade-in period is divided into two about the 3/4 of the reference final value and when a control circuit 27 detects a signal level reaching the border value, addition constants read out of a ROM 74 are switched. Therefore, the level of the sound signal rises linearly with two kinds of rise rates (gradient) in the former and latter periods of a fade-in period and the rise ratio of the former and latter periods is 4:1. Consequently, the signal processing arithmetic is facilitated. |
