| 摘要 |
PURPOSE:To amplify a signal having normal amplitude smoothly, just after an interference signal such as click having a further larger amplitude than an excessive amplitude considered in sound signals is given. CONSTITUTION:When the interference signal such as click having an excessive amplitude is inputted fom an input terminal 1, just after the amplitude of the interference signal exceeds the range of discriminating level and is returned in the discriminating level range, a transistor (TR)54 is conductive momentarily. Then, the charge in a capacitor 22 is discharged and decreased in the range where TRs 27, 28 are inactive. Thus, just after the interference signal having the excessive amplitude is relinquished and the TR54 is conductive, the TRs 27, 28 are interrupted and the input signal from the input terminal 1 is given to an amplifier circuit 4 for amplification without being attenuated at an attenuation circuit 3. |
