| 摘要 |
PURPOSE:To attain excellent linear interpolation even if the existing period of an impulsive noise is long, by bringing a signal given to a sampling and holding circuit to the state that the phase is led by a desired angle of >=90 deg. than that of an output signal. CONSTITUTION:When the existing period of an impulsvie noise mixed to an input audio signal S1 is close to 1/4 cycle of a desired signal, a control signal S2 having a pulse width corresponding to the period when the impulsvie noise exists is generated from a control signal generating circuit CSG. On the other hand, an output signal from differentiating circuits 6, 11 is added by an adder 12 and a signal S4 having a desired lead angle of >=90 deg. that of a desired signal is obtained. Further, a sampling and holding circuit 7 supplies an output signal S5 to a signal compensating circuit 5 via a gain limit circuit 13. A compensating circuit 5 interpolates linearly a missing part of the signal during the existing period of impulsive noise with the signals S2 and S5, and outputs a signal S3 from a terminal 5b. |
