| 摘要 |
PURPOSE:To reduce the noises without causing unnatural auditory feeling by giving a linear interpolating operation to a desired signal through a signal compensating circuit while the impulsive noises are generated and actuating a de- emphasizing circuit while no impulsive noise is generated. CONSTITUTION:A capacitor C and a resistance R for a de-emphasizing circuit are connected to each other via a switch circuit SWa while no impulsive noise is generated in an input signal. Then the signal passing through between a terminal 5a and a terminal 5b is de-emphasized. When the impulsive noise is generated in the input signal, the circuit SWa is turned off by a control signal S2a. At the same time, a switch circuit SWb is turned on by a control signal S2b. Then an interpolating operation is carried out to a drop-out period of signals by the functions of the series of circuits including a differentiating circuit 6, a sampling/holding circuit 7, a signal compensating circuit 5A, etc. |
