PURPOSE:To improve the signal quality with simple constitution by using an aperture correction circuit and a noise elimination circuit in common and operating the aperture correction processing and the noise eliminating processing switchingly depending on the state of an input signal. CONSTITUTION:The circuit for aperture correction processing and noise elimination processing is used in common by adding/subtracting outputs of a high pass filter(HPF) 17. Since an adder/subtractor 15 is controlled by a code output J6 of an absolute value circuit 11, when the code signal J6 is positive, addition (aperture correction) processing is executed and when the code signal J6 is negative, the subtraction (noise elimination) processing is executed. That is, when the input signal level is small in the circuit as shown in figure, the circuit acts like a noise elimination circuit and when the input signal level is large, the circuit acts like an aperture correction circuit. Thus, the effective signal processing is attained with simple circuit constitution.
展开▼
