| 摘要 |
PURPOSE:To prevent the disadvantage of degrading music enjoy environment of the user by gradually controlling a sound output with a limit operation by a volume control means and an integration limit operation by a time constant control means. CONSTITUTION:When sound data are reproduced from a magnetic tape or the like, the data are supplied to a level detection circuit 1 and an electronic volume 2 from an input terminal 14. Volume control data from a subtractor 6 are fed to the electronic volume 2 and its amplification factor is made variable depending on the data. When a volume control circuit is received with down control data, it gives control data used to decrease a volume level for manual setting by a prescribed level to the subtractor 6 and an adder 7. The adder 7 adds the volume control data and level detection data in the sound data and gives the sum to subtractors 8, 9. A volume limit circuit 10 gives the data to the subtractor 6 based on the data to implement limit operation. The data are gradually given to an integration circuit 13, which controls the level. |
