| 摘要 |
PURPOSE:To send economically an audible sound signal to increase or decrease successively an amplitude by repeating the action to make prescribed-fold an inputted audible sound signal amplitude. CONSTITUTION:From a PCM data bus 26, the tone data of a designated line are held through a gate 20 to a latch 21, inputted as the address input of a memory 28, the tone data to make K-fold the amplitude are removed and written into a tone data memory 19. When the time slot of the designated line is obtained, the K-fold amplitude tone data are read, held at the latch 21, sent through a selector 22 to the PCM data bus 30, and sent to the designated line. The K-fold amplitude tone data held at the latch 21 are inputted to the memory 28, made K-fold again, the initial tone data are made square-fold of K, written into the memory 19 and the tone data to increase or decrease successively are outputted from the PCM data bus 30.
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