| 摘要 |
PURPOSE:To generate noise even in the manual operation by controlling the operation of an automatic noise generating circuit and a manual noise generating circuit with an output control circuit and switching an output signal of the automatic noise generating circuit and the manual noise generating circuit with 1st and 2nd switches. CONSTITUTION:With a switch circuit 1 thrown to the position of (a), 1st and 2nd switches 11, 12 are selected to fetch an output signal of the manual noise generating circuit g and, for example, when signals of 1, 0 are applied to input terminals 3, 4, the signals are fed to an output control circuit 6 via a switch 5. On the other hand, the output control circuit 6 generates 4-bit control signals (1, 1, 1, 0) in response to the signals 1, 0. A -3dB.L and -3dB.R are generated at the output terminal of the manual noise generating circuit 9 and fed to a decoder 13 via the 1st and 2nd switches 11, 12 and a 2nd speaker 19 is sounded. Thus, noise is generated manually. |
